76917016 Concrete Mix Design as Per Indian Standard Code
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Concrete Mix Design As Per Indian Standard CodePosted in Project Reports | Email This Post
Concrete Mix DesignIntroductionThe process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible, is termed the concrete mix design. The proportioning of ingredient of concrete is governed by the required performance of concrete in 2 states, namely the plastic and the hardened states. If the plastic concrete is not workable, it cannot be properly placed and compacted. The property of workability, therefore, becomes of vital importance.The compressive strength of hardened concrete which is generally considered to be an index of its other properties, depends upon many factors, e.g. quality and quantity of cement, water and aggregates; batching and mixing; placing, compaction and curing. The cost of concrete is made up of the cost of materials, plant and labour. The variations in the cost of materials arise from the fact that the cement is several times costly than the aggregate, thus the aim is to produce as lean a mix as possible. From technical point of view the rich mixes may lead to high shrinkage and cracking in the structural concrete, and to evolution of high heat of hydration in mass concrete which may cause cracking.The actual cost of concrete is related to the cost of materials required for producing a minimum mean strength called characteristic strength that is specified by the designer of the structure. This depends on the quality control measures, but there is no doubt that the quality control adds to the cost of concrete. The extent of quality control is often an economic compromise, and depends on the size and type of job. The cost of labour depends on the workability of mix, e.g., a concrete mix of inadequate workability may result in a high cost of labour to obtain a degree of compaction with available equipment.Requirements of concrete mix design
The requirements which form the basis of selection and proportioning of mix ingredients are :
a ) The minimum compressive strength required from structural considerationb) The adequate workability necessary for full compaction with the compacting
equipment available.c) Maximum water-cement ratio and/or maximum cement content to give
adequate durability for the particular site conditions
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d) Maximum cement content to avoid shrinkage cracking due to temperature cycle in mass concrete.Types of Mixes
1. Nominal MixesIn the past the specifications for concrete prescribed the proportions of cement, fine and coarse aggregates. These mixes of fixed cement-aggregate ratio which ensures adequate strength are termed nominal mixes. These offer simplicity and under normal circumstances, have a margin of strength above that specified. However, due to the variability of mix ingredients the nominal concrete for a given workability varies widely in strength.
2. Standard mixesThe nominal mixes of fixed cement-aggregate ratio (by volume) vary widely in strength and may result in under- or over-rich mixes. For this reason, the minimum compressive strength has been included in many specifications. These mixes are termed standard mixes.IS 456-2000 has designated the concrete mixes into a number of grades as M10, M15, M20, M25, M30, M35 and M40. In this designation the letter M refers to the mix and the number to the specified 28 day cube strength of mix in N/mm2. The mixes of grades M10, M15, M20 and M25 correspond approximately to the mix proportions (1:3:6), (1:2:4), (1:1.5:3) and (1:1:2) respectively.
3. Designed MixesIn these mixes the performance of the concrete is specified by the designer but the mix proportions are determined by the producer of concrete, except that the minimum cement content can be laid down. This is most rational approach to the selection of mix proportions with specific materials in mind possessing more or less unique characteristics. The approach results in the production of concrete with the appropriate properties most economically. However, the designed mix does not serve as a guide since this does not guarantee the correct mix proportions for the prescribed performance.For the concrete with undemanding performance nominal or standard mixes (prescribed in the codes by quantities of dry ingredients per cubic meter and by slump) may be used only for very small jobs, when the 28-day strength of concrete does not exceed 30 N/mm2. No control testing is necessary reliance being placed on the masses of the ingredients.Factors affecting the choice of mix proportionsThe various factors affecting the mix design are:
1. Compressive strength
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It is one of the most important properties of concrete and influences many other describable properties of the hardened concrete. The mean compressive strength required at a specific age, usually 28 days, determines the nominal water-cement ratio of the mix. The other factor affecting the strength of concrete at a given age and cured at a prescribed temperature is the degree of compaction. According to Abrahams law the strength of fully compacted concrete is inversely proportional to the water-cement ratio.
2. WorkabilityThe degree of workability required depends on three factors. These are the size of the section to be concreted, the amount of reinforcement, and the method of compaction to be used. For the narrow and complicated section with numerous corners or inaccessible parts, the concrete must have a high workability so that full compaction can be achieved with a reasonable amount of effort. This also applies to the embedded steel sections. The desired workability depends on the compacting equipment available at the site.
3. DurabilityThe durability of concrete is its resistance to the aggressive environmental conditions. High strength concrete is generally more durable than low strength concrete. In the situations when the high strength is not necessary but the conditions of exposure are such that high durability is vital, the durability requirement will determine the water-cement ratio to be used.
4. Maximum nominal size of aggregateIn general, larger the maximum size of aggregate, smaller is the cement requirement for a particular water-cement ratio, because the workability of concrete increases with increase in maximum size of the aggregate. However, the compressive strength tends to increase with the decrease in size of aggregate.IS 456:2000 and IS 1343:1980 recommend that the nominal size of the aggregate should be as large as possible.
5. Grading and type of aggregateThe grading of aggregate influences the mix proportions for a specified workability and water-cement ratio. Coarser the grading leaner will be mix which can be used. Very lean mix is not desirable since it does not contain enough finer material to make the concrete cohesive.The type of aggregate influences strongly the aggregate-cement ratio for the desired workability and stipulated water cement ratio. An important feature of a satisfactory aggregate is the uniformity of the grading which can be achieved by mixing different size fractions.
6. Quality Control
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The degree of control can be estimated statistically by the variations in test results. The variation in strength results from the variations in the properties of the mix ingredients and lack of control of accuracy in batching, mixing, placing, curing and testing. The lower the difference between the mean and minimum strengths of the mix lower will be the cement-content required. The factor controlling this difference is termed as quality control.Mix Proportion designationsThe common method of expressing the proportions of ingredients of a concrete mix is in the terms of parts or ratios of cement, fine and coarse aggregates. For e.g., a concrete mix of proportions 1:2:4 means that cement, fine and coarse aggregate are in the ratio 1:2:4 or the mix contains one part of cement, two parts of fine aggregate and four parts of coarse aggregate. The proportions are either by volume or by mass. The water-cement ratio is usually expressed in massFactors to be considered for mix design
The grade designation giving the characteristic strength requirement of concrete. The type of cement influences the rate of development of compressive strength of
concrete. Maximum nominal size of aggregates to be used in concrete may be as large as possible
within the limits prescribed by IS 456:2000. The cement content is to be limited from shrinkage, cracking and creep. The workability of concrete for satisfactory placing and compaction is related to the size
and shape of section, quantity and spacing of reinforcement and technique used for transportation, placing and compaction.Procedure
1. Determine the mean target strength ft from the specified characteristic compressive strength at 28-day fck and the level of quality control.ft = fck + 1.65 Swhere S is the standard deviation obtained from the Table of approximate contents given after the design mix.
2. Obtain the water cement ratio for the desired mean target using the emperical relationship between compressive strength and water cement ratio so chosen is checked against the limiting water cement ratio. The water cement ratio so chosen is checked against the limiting water cement ratio for the requirements of durability given in table and adopts the lower of the two values.
3. Estimate the amount of entrapped air for maximum nominal size of the aggregate from the table.
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4. Select the water content, for the required workability and maximum size of aggregates (for aggregates in saturated surface dry condition) from table.
5. Determine the percentage of fine aggregate in total aggregate by absolute volume from table for the concrete using crushed coarse aggregate.
6. Adjust the values of water content and percentage of sand as provided in the table for any difference in workability, water cement ratio, grading of fine aggregate and for rounded aggregate the values are given in table.
7. Calculate the cement content form the water-cement ratio and the final water content as arrived after adjustment. Check the cement against the minimum cement content from the requirements of the durability, and greater of the two values is adopted.
8. From the quantities of water and cement per unit volume of concrete and the percentage of sand already determined in steps 6 and 7 above, calculate the content of coarse and fine aggregates per unit volume of concrete from the following relations:
where V = absolute volume of concrete= gross volume (1m3) minus the volume of entrapped airSc = specific gravity of cement
W = Mass of water per cubic metre of concrete, kgC = mass of cement per cubic metre of concrete, kgp = ratio of fine aggregate to total aggregate by absolute volume
fa, Ca = total masses of fine and coarse aggregates, per cubic metre of concrete, respectively, kg, andSfa, Sca = specific gravities of saturated surface dry fine and coarse aggregates, respectively
9. Determine the concrete mix proportions for the first trial mix.10. Prepare the concrete using the calculated proportions and cast three cubes of 150 mm size
and test them wet after 28-days moist curing and check for the strength.11. Prepare trial mixes with suitable adjustments till the final mix proportions are arrived at.
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M-20 Mix Designs as per IS-10262-2009Posted in Mix Design | Email This Post
Dear All
Again I am back with M-20 Mix Designs as per IS-10262-2009
Regards
Raj Mohammad Khan
M-20 CONCRETE MIX DESIGN
As per IS 10262-2009 & MORT&H
A-1 Stipulations for Proportioning
1Grade Designation M20
2Type of Cement
OPC 53 grade confirming to IS-12269-1987
3Maximum Nominal Aggregate Size 20 mm
4 Minimum Cement Content (MORT&H 1700-3 A) 250 kg/m3
5 Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.5
6Workability (MORT&H 1700-4) 25 mm (Slump)
7Exposure Condition Normal
8Degree of Supervision Good
9Type of Aggregate Crushed Angular Aggregate
10 Maximum Cement Content (MORT&H Cl. 1703.2) 540 kg/m3
11Chemical Admixture Type
Superplasticiser Confirming to IS-9103
A-2 Test Data for Materials
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1Cement Used Coromandal King OPC 53 grade
2Sp. Gravity of Cement 3.15
3Sp. Gravity of Water 1.00
4Chemical Admixture Not Used
5Sp. Gravity of 20 mm Aggregate 2.884
6Sp. Gravity of 10 mm Aggregate 2.878
7Sp. Gravity of Sand 2.605
8Water Absorption of 20 mm Aggregate 0.97%
9Water Absorption of 10 mm Aggregate 0.83%
10Water Absorption of Sand 1.23%
11 Free (Surface) Moisture of 20 mm Aggregate nil
12 Free (Surface) Moisture of 10 mm Aggregate nil
13Free (Surface) Moisture of Sand nil
14 Sieve Analysis of Individual Coarse Aggregates Separate Analysis Done
15 Sieve Analysis of Combined Coarse Aggregates Separate Analysis Done
15Sp. Gravity of Combined Coarse Aggregates2.882
16 Sieve Analysis of Fine Aggregates Separate Analysis Done
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A-3 Target Strength for Mix Proportioning
1Target Mean Strength (MORT&H 1700-5) 30N/mm2
2Characteristic Strength @ 28 days 20N/mm2
A-4 Selection of Water Cement Ratio
1 Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.5
2Adopted Water Cement Ratio 0.5
A-5 Selection of Water Content
1Maximum Water content (10262-table-2) 186 Lit.
2Estimated Water content for 25 mm Slump 145 Lit.
3Superplasticiser used nil
A-6 Calculation of Cement Content
1Water Cement Ratio 0.5
2Cement Content (145/0.5) 290 kg/m3
Which is greater then 250 kg/m3
A-7 Proportion of Volume of Coarse Aggregate & Fine Aggregate Content
1Vol. of C.A. as per table 3 of IS 10262 62.00%
2Adopted Vol. of Coarse Aggregate 65.00%Adopted Vol. of Fine Aggregate ( 1-0.65) 35.00%
A-8 Mix Calculations
1 Volume of Concrete in m3 1.00
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2Volume of Cement in m3 0.09(Mass of Cement) / (Sp. Gravity of Cement)x1000
3Volume of Water in m3 0.145(Mass of Water) / (Sp. Gravity of Water)x1000
4Volume of Admixture @ 0% in m3 nil(Mass of Admixture)/(Sp. Gravity of Admixture)x1000
5Volume of All in Aggregate in m3 0.763Sr. no. 1 (Sr. no. 2+3+4)
6Volume of Coarse Aggregate in m3 0.496Sr. no. 5 x 0.65
7Volume of Fine Aggregate in m3 0.267Sr. no. 5 x 0.35
A-9 Mix Proportions for One Cum of Concrete (SSD Condition)
1Mass of Cement in kg/m3 290
2Mass of Water in kg/m3 145
3Mass of Fine Aggregate in kg/m3 696
4Mass of Coarse Aggregate in kg/m3 1429Mass of 20 mm in kg/m3 1029Mass of 10 mm in kg/m3 400
5 Mass of Admixture in kg/m3 nil
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6Water Cement Ratio 0.5
We are thankful to Er. Raj M. Khan for sharing this information with us on
engineeringcivil.com. We hope this would be of great significance to civil engineers.
M-25 Mix Designs as per IS-10262-2009Posted in Mix Design | Email This Post
Dear All
Again I am back with M-25 Mix Designs as per IS-10262-2009.
Regards
Raj Mohammad Khan
M-25 CONCRETE MIX DESIGN
As per IS 10262-2009 & MORT&H
A-1 Stipulations for Proportioning
1Grade Designation M25
2Type of Cement
OPC 53 grade confirming to IS-12269-1987
3Maximum Nominal Aggregate Size 20 mm
4 Minimum Cement Content (MORT&H 1700-3 A) 310 kg/m3
5 Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.45
6Workability (MORT&H 1700-4) 50-75 mm (Slump)
7Exposure Condition Normal
8 Degree of Supervision Good
-
9Type of Aggregate Crushed Angular Aggregate
10 Maximum Cement Content (MORT&H Cl. 1703.2) 540 kg/m3
11Chemical Admixture Type
Superplasticiser Confirming to IS-9103
A-2 Test Data for Materials
1Cement Used Coromandal King OPC 53 grade
2Sp. Gravity of Cement 3.15
3Sp. Gravity of Water 1.00
4Chemical Admixture BASF Chemicals Company
5Sp. Gravity of 20 mm Aggregate 2.884
6Sp. Gravity of 10 mm Aggregate 2.878
7Sp. Gravity of Sand 2.605
8Water Absorption of 20 mm Aggregate 0.97%
9Water Absorption of 10 mm Aggregate 0.83%
10Water Absorption of Sand 1.23%
11Free (Surface) Moisture of 20 mm Aggregatenil
12Free (Surface) Moisture of 10 mm Aggregatenil
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13Free (Surface) Moisture of Sand nil
14 Sieve Analysis of Individual Coarse Aggregates Separate Analysis Done
15 Sieve Analysis of Combined Coarse Aggregates Separate Analysis Done
15Sp. Gravity of Combined Coarse Aggregates 2.882
16Sieve Analysis of Fine Aggregates Separate Analysis Done
A-3 Target Strength for Mix Proportioning
1Target Mean Strength (MORT&H 1700-5) 36N/mm2
2Characteristic Strength @ 28 days 25N/mm2
A-4 Selection of Water Cement Ratio
1 Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.45
2Adopted Water Cement Ratio 0.43
A-5 Selection of Water Content
1Maximum Water content (10262-table-2) 186 Lit.
2 Estimated Water content for 50-75 mm Slump 138 Lit.
3Superplasticiser used 0.5 % by wt. of cement
A-6 Calculation of Cement Content
1Water Cement Ratio 0.43
2Cement Content (138/0.43) 320 kg/m3
Which is greater then 310 kg/m3
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A-7 Proportion of Volume of Coarse Aggregate & Fine Aggregate Content
1Vol. of C.A. as per table 3 of IS 10262 62.00%
2Adopted Vol. of Coarse Aggregate 62.00%Adopted Vol. of Fine Aggregate ( 1-0.62) 38.00%
A-8 Mix Calculations
1Volume of Concrete in m3 1.00
2Volume of Cement in m3 0.10(Mass of Cement) / (Sp. Gravity of Cement)x1000
3Volume of Water in m3 0.138(Mass of Water) / (Sp. Gravity of Water)x1000
4Volume of Admixture @ 0.5% in m3 0.00134(Mass of Admixture)/(Sp. Gravity of Admixture)x1000
5Volume of All in Aggregate in m3 0.759Sr. no. 1 (Sr. no. 2+3+4)
6Volume of Coarse Aggregate in m3 0.471Sr. no. 5 x 0.62
7Volume of Fine Aggregate in m3 0.288Sr. no. 5 x 0.38
A-9 Mix Proportions for One Cum of Concrete (SSD Condition)
1Mass of Cement in kg/m3 320
2Mass of Water in kg/m3 138
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3Mass of Fine Aggregate in kg/m3 751
4Mass of Coarse Aggregate in kg/m3 1356Mass of 20 mm in kg/m3 977Mass of 10 mm in kg/m3 380
5Mass of Admixture in kg/m3 1.60
6Water Cement Ratio 0.43
We are thankful to Er. Raj M. Khan for sharing this information with us on
engineeringcivil.com. We hope this would be of great significance to civil engineers.
M-30 Mix Designs as per IS-10262-2009Posted in Mix Design | Email This Post
Dear All
Again I am back with M-30 Mix Designs as per IS-10262-2009
Regards
Raj Mohammad Khan
M-30 CONCRETE MIX DESIGN
As per IS 10262-2009 & MORT&H
A-1 Stipulations for Proportioning
1Grade Designation M30
2Type of Cement
OPC 53 grade confirming to IS-12269-1987
3Maximum Nominal Aggregate Size 20 mm
4 Minimum Cement Content (MORT&H 1700-3 A) 310 kg/m3
5 Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.45
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6Workability (MORT&H 1700-4) 50-75 mm (Slump)
7Exposure Condition Normal
8Degree of Supervision Good
9Type of Aggregate Crushed Angular Aggregate
10 Maximum Cement Content (MORT&H Cl. 1703.2) 540 kg/m3
11Chemical Admixture Type
Superplasticiser Confirming to IS-9103
A-2 Test Data for Materials
1Cement Used Coromandal King OPC 53 grade
2Sp. Gravity of Cement 3.15
3Sp. Gravity of Water 1.00
4Chemical Admixture BASF Chemicals Company
5Sp. Gravity of 20 mm Aggregate 2.884
6Sp. Gravity of 10 mm Aggregate 2.878
7Sp. Gravity of Sand 2.605
8Water Absorption of 20 mm Aggregate 0.97%
9Water Absorption of 10 mm Aggregate 0.83%
10Water Absorption of Sand 1.23%
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11Free (Surface) Moisture of 20 mm Aggregate nil
12Free (Surface) Moisture of 10 mm Aggregate nil
13Free (Surface) Moisture of Sand nil
14 Sieve Analysis of Individual Coarse Aggregates Separate Analysis Done
15 Sieve Analysis of Combined Coarse Aggregates Separate Analysis Done
15Sp. Gravity of Combined Coarse Aggregates 2.882
16Sieve Analysis of Fine Aggregates Separate Analysis Done
A-3 Target Strength for Mix Proportioning
1Target Mean Strength (MORT&H 1700-5) 42N/mm2
2Characteristic Strength @ 28 days 30N/mm2
A-4 Selection of Water Cement Ratio
1 Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.45
2Adopted Water Cement Ratio 0.42
A-5 Selection of Water Content
1Maximum Water content (10262-table-2) 186 Lit.
2 Estimated Water content for 50-75 mm Slump 160 Lit.
3Superplasticiser used 0.5 % by wt. of cement
A-6 Calculation of Cement Content
1 Water Cement Ratio 0.42
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2Cement Content (160/0.42) 380 kg/m3
Which is greater then 310 kg/m3
A-7 Proportion of Volume of Coarse Aggregate & Fine Aggregate Content
1Vol. of C.A. as per table 3 of IS 10262 62.00%
2Adopted Vol. of Coarse Aggregate 62.00%Adopted Vol. of Fine Aggregate ( 1-0.62) 38.00%
A-8 Mix Calculations
1Volume of Concrete in m3 1.00
2Volume of Cement in m3 0.12(Mass of Cement) / (Sp. Gravity of Cement)x1000
3Volume of Water in m3 0.160(Mass of Water) / (Sp. Gravity of Water)x1000
4Volume of Admixture @ 0.5% in m3 0.00160(Mass of Admixture)/(Sp. Gravity of Admixture)x1000
5Volume of All in Aggregate in m3 0.718Sr. no. 1 (Sr. no. 2+3+4)
6Volume of Coarse Aggregate in m3 0.445Sr. no. 5 x 0.62
7Volume of Fine Aggregate in m3 0.273Sr. no. 5 x 0.38
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A-9 Mix Proportions for One Cum of Concrete (SSD Condition)
1Mass of Cement in kg/m3 380
2Mass of Water in kg/m3 160
3Mass of Fine Aggregate in kg/m3 711
4Mass of Coarse Aggregate in kg/m3 1283Mass of 20 mm in kg/m3 924Mass of 10 mm in kg/m3 359
5Mass of Admixture in kg/m3 1.90
6Water Cement Ratio 0.42
We are thankful to Er. Raj M. Khan for sharing this information with us on
engineeringcivil.com. We hope this would be of great significance to civil engineers.
M-35 Mix Designs as per IS-10262-2009Posted in Mix Design | Email This Post
Dear All
Again I am back with M-35 Mix Designs as per IS-10262-2009
Regards
Raj Mohammad Khan
CONCRETE MIX DESIGN
As per IS 10262-2009 & MORT&H
A-1 Stipulations for Proportioning
1Grade Designation M35
2Type of Cement
OPC 53 grade confirming to IS-12269-1987
3 Maximum Nominal Aggregate Size 20 mm
-
4 Minimum Cement Content (MORT&H 1700-3 A) 310 kg/m3
5 Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.45
6Workability (MORT&H 1700-4) 50-75 mm (Slump)
7Exposure Condition Normal
8Degree of Supervision Good
9Type of Aggregate Crushed Angular Aggregate
10 Maximum Cement Content (MORT&H Cl. 1703.2) 540 kg/m3
11Chemical Admixture Type
Superplasticiser Confirming to IS-9103
A-2 Test Data for Materials
1Cement Used Coromandal King OPC 53 grade
2Sp. Gravity of Cement 3.15
3Sp. Gravity of Water 1.00
4Chemical Admixture BASF Chemicals Company
5Sp. Gravity of 20 mm Aggregate 2.884
6Sp. Gravity of 10 mm Aggregate 2.878
7Sp. Gravity of Sand 2.605
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8Water Absorption of 20 mm Aggregate 0.97%
9Water Absorption of 10 mm Aggregate 0.83%
10Water Absorption of Sand 1.23%
11 Free (Surface) Moisture of 20 mm Aggregate nil
12 Free (Surface) Moisture of 10 mm Aggregate nil
13Free (Surface) Moisture of Sand nil
14 Sieve Analysis of Individual Coarse Aggregates Separate Analysis Done
15 Sieve Analysis of Combined Coarse Aggregates Separate Analysis Done
15 Sp.Gravity of Combined Coarse Aggregates 2.882
16Sieve Analysis of Fine Aggregates Separate Analysis Done
A-3 Target Strength for Mix Proportioning
1Target Mean Strength (MORT&H 1700-5) 47N/mm2
2Characteristic Strength @ 28 days 35N/mm2
A-4 Selection of Water Cement Ratio
1 Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.45
2Adopted Water Cement Ratio 0.4
A-5 Selection of Water Content
1Maximum Water content (10262-table-2) 186 Lit.
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2 Estimated Water content for 50-75 mm Slump 160 Lit.
3Superplasticiser used 0.5 % by wt. of cement
A-6 Calculation of Cement Content
1Water Cement Ratio 0.4
2Cement Content (160/0.42) 400 kg/m3
Which is greater then 310 kg/m3
A-7 Proportion of Volume of Coarse Aggregate & Fine Aggregate Content
1Vol. of C.A. as per table 3 of IS 10262 62.00%
2Adopted Vol. of Coarse Aggregate 62.00%Adopted Vol. of Fine Aggregate ( 1-0.62) 38.00%
A-8 Mix Calculations
1Volume of Concrete in m3 1.00
2Volume of Cement in m3 0.13(Mass of Cement) / (Sp. Gravity of Cement)x1000
3Volume of Water in m3 0.160(Mass of Water) / (Sp. Gravity of Water)x1000
4Volume of Admixture @ 0.5% in m3 0.00168(Mass of Admixture)/(Sp. Gravity of Admixture)x1000
5Volume of All in Aggregate in m3 0.711Sr. no. 1 (Sr. no. 2+3+4)
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6Volume of Coarse Aggregate in m3 0.441Sr. no. 5 x 0.62
7Volume of Fine Aggregate in m3 0.270Sr. no. 5 x 0.38
A-9 Mix Proportions for One Cum of Concrete (SSD Condition)
1Mass of Cement in kg/m3 400
2Mass of Water in kg/m3 160
3Mass of Fine Aggregate in kg/m3 704
4Mass of Coarse Aggregate in kg/m3 1271Mass of 20 mm in kg/m3 915Mass of 10 mm in kg/m3 356
5Mass of Admixture in kg/m3 2.00
6Water Cement Ratio 0.40
We are thankful to Er. Raj M. Khan for sharing this information with us on
engineeringcivil.com. We hope this would be of great significance to civil engineers.
M 15 Mix Designs as per IS-10262-2009Posted in Mix Design | Email This Post
Dear All,
Here i am giving the mix designs as per IS-10262-2009 which gives to change the
procedure for calculating the concrete ingredients
Regards
Raj Mohammad Khan
M-15 CONCRETE MIX DESIGN
As per IS 10262-2009 & MORT&H
-
A-1Stipulations for Proportioning
1Grade Designation M15
2Type of Cement
OPC 53 grade confirming to IS-12269-1987
3Maximum Nominal Aggregate Size 20 mm
4 Minimum Cement Content (MORT&H 1700-3 A) 250 kg/m3
5 Maximum Water Cement Ratio (MORT&H 1700-3 A) 0.5
6Workability (MORT&H 1700-4) 25 mm (Slump)
7Exposure Condition Normal
8Degree of Supervision Good
9Type of Aggregate Crushed Angular Aggregate
10 Maximum Cement Content (MORT&H Cl. 1703.2) 540 kg/m3
11Chemical Admixture Type
Superplasticiser Confirming to IS-9103
A-2Test Data for Materials
1Cement Used Coromandal King OPC 53 grade
2Sp. Gravity of Cement 3.15
3Sp. Gravity of Water 1.00
4Chemical Admixture Not Used
5 Sp. Gravity of 20 mm Aggregate 2.884
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6Sp. Gravity of 10 mm Aggregate 2.878
7Sp. Gravity of Sand 2.605
8Water Absorption of 20 mm Aggregate 0.97%
9Water Absorption of 10 mm Aggregate 0.83%
10Water Absorption of Sand 1.23%
11 Free (Surface) Moisture of 20 mm Aggregate nil
12 Free (Surface) Moisture of 10 mm Aggregate nil
13Free (Surface) Moisture of Sand nil
14 Sieve Analysis of Individual Coarse Aggregates Separate Analysis Done
15 Sieve Analysis of Combined Coarse Aggregates Separate Analysis Done
15 Sp.Gravity of Combined Coarse Aggregates 2.882
16Sieve Analysis of Fine Aggregates Separate Analysis Done
A-3Target Strength for Mix Proportioning
1 Target Mean Strength (MORT&H 1700-5) 25N/mm2
2Characteristic Strength @ 28 days 15N/mm2
A-4Selection of Water Cement Ratio
1 Maximum Water Cement Ratio 0.5
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(MORT&H 1700-3 A)
2Adopted Water Cement Ratio 0.5
A-5Selection of Water Content
1 Maximum Water content (10262-table-2) 186 Lit.
2 Estimated Water content for 25 mm Slump 135 Lit.
3Superplasticiser used nil
A-6Calculation of Cement Content
1Water Cement Ratio 0.5
2Cement Content (135/0.5) 270 kg/m3
Which is greater then 250 kg/m3
A-7Proportion of Volume of Coarse Aggregate & Fine Aggregate Content
1Vol. of C.A. as per table 3 of IS 10262 62.00%
2Adopted Vol. of Coarse Aggregate 65.00%Adopted Vol. of Fine Aggregate ( 1-0.65) 35.00%
A-8Mix Calculations
1Volume of Concrete in m3 1.00
2Volume of Cement in m3 0.09(Mass of Cement) / (Sp. Gravity of Cement)x1000
3Volume of Water in m3 0.135(Mass of Water) / (Sp. Gravity of
-
Water)x1000
4Volume of Admixture @ 0% in m3 nil(Mass of Admixture)/(Sp. Gravity of Admixture)x1000
5Volume of All in Aggregate in m3 0.779Sr. no. 1 (Sr. no. 2+3+4)
6Volume of Coarse Aggregate in m3 0.507Sr. no. 5 x 0.65
7Volume of Fine Aggregate in m3 0.273Sr. no. 5 x 0.35
A-9Mix Proportions for One Cum of Concrete (SSD Condition)
1Mass of Cement in kg/m3 270
2Mass of Water in kg/m3 135
3Mass of Fine Aggregate in kg/m3 711
4Mass of Coarse Aggregate in kg/m3 1460Mass of 20 mm in kg/m3 1051Mass of 10 mm in kg/m3 409
5Mass of Admixture in kg/m3 nil
6Water Cement Ratio 0.5
We are thankful to Er. Raj M. Khan for sharing this information with us on
engineeringcivil.com. We hope this would be of great significance to civil engineers.
Mix Design For M35 Grade Of Concrete
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Posted in Mix Design | Email This Post
The mix design for M35 Grade Of Concrete for pile foundations provided here is for
reference purpose only. Actual site conditions vary and thus this should be adjusted
as per the location and other factors.
Grade of Concrete : M35
Characteristic Strength (Fck) : 35 Mpa
Standard Deviation : 1.91 Mpa*
Target Mean Strength : T.M.S.= Fck +1.65 x S.D.
(from I.S 456-2000) = 35+ 1.651.91
= 38.15 Mpa
Test Data For Material:
Aggregate Type : Crushed
Specific Gravity
Cement : 3.15
Coarse Aggregate : 2.67
Fine Aggregate : 2.62
Water Absorption:
Coarse Aggregate : 0.5%
Fine Aggregate : 1.0 %
MIX DESIGN
Take Sand content as percentage of total aggregates = 36%
Select Water Cement Ratio = 0.43 for concrete grade M35
(From Fig 2. of I.S. 10262- 1982)
Select Water Content = 172 Kg
(From IS: 10262 for 20 mm nominal size of aggregates Maximum Water Content =
186 Kg/ M3 )
Hence, Cement Content= 172 / 0.43 = 400 Kg / M3
Formula for Mix Proportion of Fine and Coarse Aggregate:
1000(1-a0) = {(Cement Content / Sp. Gr. Of Cement) + Water Content +(Fa / Sp.
Gr.* Pf )}
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1000(1-a0) = {(Cement Content / Sp. Gr. Of Cement) + Water Content +Ca / Sp.
Gr.* Pc )}
Where Ca = Coarse Aggregate Content
Fa = Fine Aggregate Content
Pf = Sand Content as percentage of total Aggregates
= 0.36
Pc = Coarse Aggregate Content as percentage of total Aggregates.
= 0.64
a0 = Percentage air content in concrete (As per IS :10262 for 20 mm nominal size of
aggregates air content is 2 %) = 0.02
Hence, 1000(1-0.02) = {(400 /3.15) + 172 +(Fa / 2.62 x 0.36)}
Fa = 642 Kg/ Cum
As the sand is of Zone II no adjustment is required for sand.
Sand Content = 642 Kg/ Cum
1000(1-0.02) = {(400 /3.15) + 172 +(Ca / 2.67 x 0.64)}
Hence, Ca = 1165 Kg/ Cum
From combined gradation of Coarse aggregates it has been found out that the
proportion of 53:47 of 20 mm & 10 mm aggregates produces the best gradation as
per IS: 383.
Hence, 20 mm Aggregates = 619 Kg
And 10 mm Aggregates = 546 Kg
To obtain slump in the range of 150-190 mm water reducing admixture brand SP430
from Fosroc with a dose of 0.3 % by weight of Cement shall be used.
Hence the Mix Proportion becomes:
Units Kg/ M3
Cement : Sand: Coarse
Aggregates = 1 : 1.6 :
2.907
Cem W/C Water Sand 20mm 10mm Admix400 0.43 172 635 619 564 1.21 0.43 1.6 1.547 1.36 0.003
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We are thankful to Er. Ishan Kaushal for this valuable information.
Mix Design M-50 GradePosted in Mix Design | Email This Post
The mix design M-50 grade (Using Admixture Sikament) provided here is for
reference purpose only. Actual site conditions vary and thus this should be adjusted
as per the location and other factors.
Parameters for mix design M50
Grade Designation = M-50
Type of cement = O.P.C-43 grade
Brand of cement = Vikram ( Grasim )
Admixture = Sika [Sikament 170 ( H ) ]
Fine Aggregate = Zone-II
Sp. Gravity
Cement = 3.15
Fine Aggregate = 2.61
Coarse Aggregate (20mm) = 2.65
Coarse Aggregate (10mm) = 2.66
Minimum Cement (As per contract) =400 kg / m3
Maximum water cement ratio (As per contract) = 0.45
Mix Calculation: -
1. Target Mean Strength = 50 + ( 5 X 1.65 ) = 58.25 Mpa
2. Selection of water cement ratio:-
Assume water cement ratio = 0.35
3. Calculation of water: -
Approximate water content for 20mm max. Size of aggregate = 180 kg /m3 (As per
Table No. 5 , IS : 10262 ). As plasticizer is proposed we can reduce water content by
20%.
Now water content = 180 X 0.8 = 144 kg /m3
4. Calculation of cement content:-
Water cement ratio = 0.35
Water content per cum of concrete = 144 kg
Cement content = 144/0.35 = 411.4 kg / m3
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Say cement content = 412 kg / m3 (As per contract Minimum cement content 400 kg
/ m3 )
Hence O.K.
5. Calculation for C.A. & F.A.: [ Formula's can be seen in earlier posts]-
Volume of concrete = 1 m3
Volume of cement = 412 / ( 3.15 X 1000 ) = 0.1308 m3
Volume of water = 144 / ( 1 X 1000 ) = 0.1440 m3
Volume of Admixture = 4.994 / (1.145 X 1000 ) = 0.0043 m3
Total weight of other materials except coarse aggregate = 0.1308 + 0.1440 +0.0043
= 0.2791 m3
Volume of coarse and fine aggregate = 1 0.2791 = 0.7209 m3
Volume of F.A. = 0.7209 X 0.33 = 0.2379 m3 (Assuming 33% by volume of total
aggregate )
Volume of C.A. = 0.7209 0.2379 = 0.4830 m3
Therefore weight of F.A. = 0.2379 X 2.61 X 1000 = 620.919 kg/ m3
Say weight of F.A. = 621 kg/ m3
Therefore weight of C.A. = 0.4830 X 2.655 X 1000 = 1282.365 kg/ m3
Say weight of C.A. = 1284 kg/ m3
Considering 20 mm: 10mm = 0.55: 0.45
20mm = 706 kg .
10mm = 578 kg .
Hence Mix details per m3
Increasing cement, water, admixture by 2.5% for this trial
Cement = 412 X 1.025 = 422 kg
Water = 144 X 1.025 = 147.6 kg
Fine aggregate = 621 kg
Coarse aggregate 20 mm = 706 kg
Coarse aggregate 10 mm = 578 kg
Admixture = 1.2 % by weight of cement = 5.064 kg.
Water: cement: F.A.: C.A. = 0.35: 1: 1.472: 3.043
Observation: -
A. Mix was cohesive and homogeneous.
B. Slump = 120 mm
C. No. of cube casted = 9 Nos.
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7 days average compressive strength = 52.07 MPa.
28 days average compressive strength = 62.52 MPa which is greater than 58.25MPa
Hence the mix accepted.
We are thankful to Er Gurjeet Singh for this valuable information.
Mix Design M-40 GradePosted in Mix Design | Email This Post
The mix design M-40 grade for Pier (Using Admixture Fosroc) provided here is for
reference purpose only. Actual site conditions vary and thus this should be adjusted
as per the location and other factors.
Parameters for mix design M40
Grade Designation = M-40
Type of cement = O.P.C-43 grade
Brand of cement = Vikram ( Grasim )
Admixture = Fosroc ( Conplast SP 430 G8M )
Fine Aggregate = Zone-II
Sp. Gravity Cement = 3.15
Fine Aggregate = 2.61
Coarse Aggregate (20mm) = 2.65
Coarse Aggregate (10mm) = 2.66
Minimum Cement (As per contract) = 400 kg / m3
Maximum water cement ratio (As per contract) = 0.45
Mix Calculation: -
1. Target Mean Strength = 40 + (5 X 1.65) = 48.25 Mpa
2. Selection of water cement ratio:-
Assume water cement ratio = 0.4
3. Calculation of cement content: -
Assume cement content 400 kg / m3
(As per contract Minimum cement content 400 kg / m3)
4. Calculation of water: -
400 X 0.4 = 160 kg Which is less than 186 kg (As per Table No. 4, IS: 10262)
Hence o.k.
5. Calculation for C.A. & F.A.: As per IS : 10262 , Cl. No. 3.5.1
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V = [ W + (C/Sc) + (1/p) . (fa/Sfa) ] x (1/1000)
V = [ W + (C/Sc) + {1/(1-p)} . (ca/Sca) ] x (1/1000)
Where
V = absolute volume of fresh concrete, which is equal to gross volume (m3) minus
the volume of entrapped air ,
W = mass of water ( kg ) per m3 of concrete ,
C = mass of cement ( kg ) per m3 of concrete ,
Sc = specific gravity of cement,
(p) = Ratio of fine aggregate to total aggregate by absolute volume ,
(fa) , (ca) = total mass of fine aggregate and coarse aggregate (kg) per m3 of
Concrete respectively, and
Sfa , Sca = specific gravities of saturated surface dry fine aggregate and Coarse
aggregate respectively.
As per Table No. 3 , IS-10262, for 20mm maximum size entrapped air is 2% .
Assume F.A. by % of volume of total aggregate = 36.5 %
0.98 = [ 160 + ( 400 / 3.15 ) + ( 1 / 0.365 ) ( Fa / 2.61 )] ( 1 /1000 )
=> Fa = 660.2 kg
Say Fa = 660 kg.
0.98 = [ 160 + ( 400 / 3.15 ) + ( 1 / 0.635 ) ( Ca / 2.655 )] ( 1 /1000 )
=> Ca = 1168.37 kg.
Say Ca = 1168 kg.
Considering 20 mm : 10mm = 0.6 : 0.4
20mm = 701 kg .
10mm = 467 kg .
Hence Mix details per m3
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Cement = 400 kg
Water = 160 kg
Fine aggregate = 660 kg
Coarse aggregate 20 mm = 701 kg
Coarse aggregate 10 mm = 467 kg
Admixture = 0.6 % by weight of cement = 2.4 kg.
Recron 3S = 900 gm
Water: cement: F.A.: C.A. = 0.4: 1: 1.65: 2.92
Observation: -
A. Mix was cohesive and homogeneous.
B. Slump = 110mm
C. No. of cube casted = 12 Nos.
7 days average compressive strength = 51.26 MPa.
28 days average compressive strength = 62.96 MPa which is greater than 48.25MPa
Hence the mix is accepted.
We are thankful to Er Gurjeet Singh for this valuable information.
Concrete Mix Design As Per Indian Standard CodeM-20 Mix Designs as per IS-10262-2009M-25 Mix Designs as per IS-10262-2009M-30 Mix Designs as per IS-10262-2009M-35 Mix Designs as per IS-10262-2009M 15 Mix Designs as per IS-10262-2009Mix Design For M35 Grade Of ConcreteMix Design M-50 GradeMix Design M-40 Grade