HSC Report

Report on:

HIGH STRENGTH CONCRETE

Subject: Advanced Material

M.Tech CASAD 1st semester

Nirma University

Introduction

Concrete, a composite consisting of aggregates enclosed in a matrix of cement paste including possible pozzolans, has two major components – cement paste and aggregates.

The strength of concrete depends upon the strength of these components, their deformation properties, and the adhesion between the paste and aggregate surface. With most natural aggregates, it is possible to make concretes up to 120 MP compressive strength by improving the strength of the cement paste, which can be controlled through the choice of water-content ratio and type and dosage of admixtures.

However, with the recent advancement in concrete technology and the availability of various types of mineral and chemical admixtures, and special super plasticizer, concrete with a compressive strength of up to 100 MPa can now be produced commercially with an acceptable level of variability using ordinary aggregates.

The use of high strength concrete is increased now days. High strength concrete differ from normal strength concrete in that it variably contains a high rang water reducer (or super plasticizer), while the normal strength concrete contains it rarely. All other basic ingredients may be the same, namely Portland cement, aggregate water and admixture. As some other ingredients are concerned such as retarders, fly ash, blast furnace slag and silica fume and they may or may not be presented in either type of concrete.

The design of concrete mixtures involves the determination of the most economical and practical combination of concrete ingredients to achieve concrete that is workable in its plastic state and will develop the required qualities when hardened.

The high compressive strength can be advantageously used in compression members like columns and piles. Higher compressive strength of concrete results in reduction column size and increases available floor space. HSC can also be effectively used in structures such as domes, folded plates, shells and arches where large in-plane compressive stresses exist.

The relatively higher compressive strength per unit volume, per unit weight will also reduce the overall dead load on foundation of a structure with HSC. Also, the inherent techniques of producing HSC generate a dense microstructure making ingress of deleterious chemicals from the environment into the concrete core difficult, thus enhancing the long-term durability and performance of the structure.

Material Properties: After collecting the material physical property was found out:

1. Cement Properties:

Physical properties Results obtained

IS:12269 guidelines

Fineness 225 m2/kg Normal Consistency 33 - Vicat Initial Setting Time 31.5 min 30 min (min.) Vicat Final Setting Time 457 min 600 min (max.) Compressive Strength(7-day) 37 N/mm2

Compressive Strength(28-day) 53 N/mm2

2. Aggregate Properties:

Lab Result Properties Course

Aggregate Fine Aggregate

Specific Gravity

2.97 2.74

Dry Bulk Density

1678

Loose Bulk Density

1510

Water Absorption

1.20 % 5.20 %

3. Fly Ash & Metakeoline Properties :

Lab Result Properties Fly Ash Metakeoline Specific Gravity

3.15 2.5

4. Admixture GLENIUM 149 :

Mix Design:

According to IS 10262:2009 mix design of nominal concrete has been carried

out for M60 grade concrete. As per IS the following are calculation step for mix

design.

The calculation data:-

Cement Concrete -HSC

Grade Designation -M70

Type of Cement -OPC 53 Grade

Maximum Nominal size of Aggregate in mm-20

Minimum Cement content in Kg/m3 -450

Maximum Water-Cement Ratio -0.27

Workability (Slump) in mm -100

Exposure Condition -Moderate

GLENIUM 149 Parameter Specifications Results Physical State Light Brown Free

Flowing Liquid Light Brown Free Flowing Liquid

Chemical Name Of Active Ingredient

Polycarboxylate Polymers

Polycarboxylate Polymers

Relative Density At 25o C

1.10 + 0.01 1.10 - 0.01

1.106

Chloride Iron Content (%)

Max. 0.2 0.0017

pH Min. 6 6.84 Dry Material Content 36 + (%5)

36 - (%5) 35.40

HSC Designs from Research Papers Strength at 28 day M60 M60 M60 M60 M65 M65 M70 M70 M70 M70

Grade of cement 53 53 53

Maximum size of aggregate(mm) 20 12.5 20 20

Degree of Workability collapsible collapsible

Degree of quality control good good

Type of Exposure severe severe

Specific gravity of cement 3.15 3.15 3.15 3.15 3.15

specific gravity of fly ash 2.24 2.2 2.24 2.72

Specific gravity of microsilica 2.21 2.21

setting time of cement(min) initial 120 60 165

final 185 320 270

3day 45.21 29.4 39

Cement compressive 7day 54.82 44.8 51

strength(N/mm2) 28day 69.32 56.5 64.2

Fineness modulus fine 3 3 3

Specific gravity of aggregate 20mm 2.729 2.6 2.729 2.78

12.5mm 2.64

10mm 2.747 2.6 2.747

R/san 2.751 2.6 2.6 2.751

C/san 2.697 2.6 2.697

Water absorption of aggregate 20mm 1.54 1.54

10mm 1.78 1.78

R/san 3.78 3.78

C/san 4.49 4.49

Cement used (kg/cum) 450 504.2 430 430 500 390 482 486 406 485

Slump

Fly ash used (kg/cum) 80 80 50 60 100 20% 90 174

microsilica used (kg/cum) 40 24

Blast furnace slag (kg/cum)

Silica fume (kg/cum) 50 0

Metakaoline 10%

ALCCOFINE 1203 0 50

W/C 0.24 0.32 0.33 0.26 0.27

20mm (kg/cum) 546 545 530 202.4 405 0

12.5mm (kg/cum) 1108

10mm (kg/cum) 444 365 360 1068 1141 809.6 612 1043 1143

r/sand (kg/cum) 604 683.2 665 650 608 575 715 340 524 762

c/sand (kg/cum) 174 175 170 334

water (kg/cum) 137 141.6 159 140 178 161 153 154 186 130

Admixture by weight of (C+F+MS) 1.80% 466.81 1.30% 1.00% 9.6kg/ 0.50% 3.4lit/c

3day 40.98 49.13

cube compressive strength 7day 57.71 59.57

(N/mm2) 28day 70.96 81.49

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Material Quantity:

Fly Ash : 15% Of cement

Metakeoline : 10% Of cement

Admixture : 1% Of cementing Material

Material Quantity Concrete 1 m3

Cement 450 Kg Fly Ash 67.5 Kg Metakeoline 45 Kg Water 153 Kg 20 mm Aggregate 202.4 Kg 10 mm Aggregate 809.6 Kg W/C Ratio 0.27 Sand 715 Kg Admixture 5.625 Kg

Testing of Concrete:

Testing Results

7 DAYS STRENGTH BEAM CUBE CYLINDER

WEIGHT STRENGTH WEIGHT STRENGTH WEIGHT STRENGTH Kg N/mm2 Kg N/mm2 Kg N/mm2

12.48 7.50 8.6 36.8 12.89 2.9709 12.1 7.00 8.68 37.77 12.97 3.5368

12.23 8.50 8.48 38.89 12.79 3.1124



12.28 8.00 8.62 53.33 12.35 4.2441 12.3 8.50 8.57 40.44 12.8 4.2441 12.5 7.50 8.35 54.222 12.69 3.6782

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12.3 9.00 9.1 63.55 12.95 4.3856 12.15 7.50 8.95 57.77 13.03 4.6685 12.28 7.50 8.77 56.88 12.8 4.1027

28 Days Modulus of elasticity

CYLINDER 1

STRESS 5.66 11.32 16.98 22.64 28.29 N/mm2 STRAIN 0.000167 0.000333 0.000467 0.000633 0.000833

CYLINDER 2


CYLINDER 3


0.000000

0.000100

0.000200

0.000300

0.000400

0.000500

0.000600

0.000700

0.000800

0.000900

5.66 11.32 16.98 22.64 28.29

STR

ESS

STRAIN

Modulus of elasticity

CYLINDER 1 CYLINDER 3 CYLINDER 3

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Conclusion:

By use of cementing material one can improve the strength of

concrete, but Replacement of cement by cementing material should be

limited because replacing large amount of cement will not give desire

result.

HSC Report

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