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INTERNAL CURING USING LIGHT WEIGHT AGGREGATES

BY:-ATULHARISH KASERAVIVEK MANGALAKRITI ZUTSHIASHWIN TYAGI

GUIDED BY:-Prof. A.I. TAMBOLI

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INDEX1. INTRODUCTION2. WHY INTERNAL CURING3. LITERATURE SURVEY4. MATERIAL5. ABOUT LECA6. APPLICATION OF LECA7. LIST OF EXPERIMENTS AND TESTS8. SCHEDULE OF WORK THROUGH OUT THE YEAR9. MIX DESIGN10. QUANTITATIVE ANALYSIS11. CASTING & CURING12. EXPECTED RESULTS AND CONCLUSION13. STATISTICS OF WORK

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INTRODUCTION Internal curing provides a set of water-

filled reservoirs within the concrete that supply water on demand to the hydrating cement paste from the time of mixing.

It reduces plastic shrinkage and maintain workability.

Internal curing is achieved by replacing coarse aggregate with expanded clay up to certain percentage.

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Why internal curingInternal Curing is a practical way of

supplying additional curing water throughout the concrete mixture.

This is done by using water absorbed in expanded shale, clay or slate (ESCS) lightweight aggregate, which replaces some of the conventional aggregate in the mixture.

Internal curing is often referred to as “curing concrete from the inside out.”

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LITERATURE SURVEY:-NAMES DATE OF

PUBLISHMENTTOPICS

Developed by ESCSI and ASTM

West conshohocken PA 2006

Internal curing with the help of LWECA

A project by:-J.schlitterR. henkensiefkenJ. castroK. raoufiJ.Weiss

October 2010FHWA/IN/JTRP-2010/10, SPR-3211

development of internally curedconcrete for increased service life

K. Krishna bhavani siram

ISSN: 2249 – 8958, Volume-2, Issue-2, December 2012

Cellular lightweight concrete as replacement of burnt clay bricks.

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NAMES DATE OF PUBLISHMENT

TOPIC

Dayalan J*,Buellah M**IJIRSET (ISSN:2319-8753)

Vol-3,march 2014 Internal curing of concrete using prewetted light weight aggregates.

Michael golias,Javier castro,Jason weiss

Recived 18 nov 2011Accepted 25feb 2012

Influence of moisture content of LWA on internal curing

 Javiero Castro, Dale Bentz, Jason Weiss

6/2012 Application of internal curing

Nagashree .v, Dr. S vijayaISSN: 2278-0181

Vol. 4 Issue 07, July-2015

Study of LWC,by leca

Dale p. Bentz, pietro lura, and john w. Roberts

Mixed design for internal curing

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MATERIAL:-CementCoarse aggregatesFine aggregatesLeca(light weight expanded clay

aggregates).

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ABOUT LECAThermal conductivity coefficient for LECA

aggregate is about 0.09 w/mc and for LECA concrete 0.208 w/mc with density of 800 kg/m3.

SOUND INSULATION LIGHTNESS FIRE RESISTANCE WATER ABSORPTION NON DECOMPOSABILITY DURABILITY FROST RESISTANCE

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Light weighted Expanded Clay Aggregates(LECA)

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.

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 concrete blocks Pavement design Roof design Agriculture and horticulture Geotechnical fillings Water treatment Runway of airports Landscaping Sewage system Light weight filler Water purification system Prefabricated panels

Applications of LECA

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Schedule of work through out the year.

1) Preliminary investigation:- 2 months2) Literature survey :- 1 month3) Mix design , Quantity analysis

&Cube casting (for external as well as for internal curing):-2 months

4) Curing :-1month5) Testing :- 1.5 months(45days)6) Thesis compilation ,research paper

publication & conference.

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List of tests/experiments:-Tests based on :-* Workability (slump cone, compaction factor,

flow table)* Durability :-(acid test and alkaline test) a)Rapid chloride penetration test b)acid attack on control cubes c) acid attack on cube with different

percentages of expanded clay.*Compressive strength , Split tensile strength. a) Compression test* Grading of cement

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Workability TestSlump testMix with replacement

5% 10% 15% 20%

Type of Slump

True Shear Shear Collapse

Height(mm)

29 28 26 19

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Compaction factor testSr no

Mix with replacement

Water cement ratio

Mass with partially compacted concrete

Mass with fully compacted concrete

Mass of partiallycompacted concreteW2-W1

Mass of fully compacted concrete

C.F.=

5% 0.5 14.2kg 15.6kg 6.6kg 8.0kg 0.82510% 0.5 14.4kg 16.0kg 6.8kg 8.3kg 0.81915% 0.5 16.2kg 17.2kg 8.6kg 9.6kg 0.920% 0.5 15.8 kg 16.6 kg 8.2kg 9.0kg 0.91

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WWWW

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Mix designWater cement ratio - 0.5Specific gravity of fine aggregate - 2.6Specific gravity of coarse aggregate -

2.75Specific gravity of cement – 3.157Target mean strength – 27.59 N/mm2Ratio of mix design is

1 : 1.62 : 3.4(cement : sand : aggregate)

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Proportion of material per cubic meter

* Cement – 362.5 kg * F.A - 588 kg * C.A -1233.18 kgVolume of one cube-3.375*10ˉ³ m³

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Quantitative analysis- (for cubes)Sr .no. MATERIAL QUANTITY 1 QUANTITY

251 Cement 1.22 30.5kg

2 F.A 1.98 49.51kg

3 C.A 4.16 104kg

4 Water 0.61lit 15lit

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% change with C.A and LECA PERCENTAGE (LECA)

C.A (kg)

LECA (kg)

5% 98.8 5.2

10% 93.6 10.4

15% 88.4 15.6

20% 83.2 20.8

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Casting 0% replacement - 3 block5% replacement – 6 blocks10% replacement – 6 blocks15% replacement – 6 blocks20% replacement – 6 blocks

Total no of cubes - 27

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Statistic of work done till date

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20

40

60

80

100

120

TOPIC SELEC-TION

LITERATURE SURVEY

MIX DESIGN

QUANTITY ANALYSIS

THESISCOMPI-LATION

Completed task

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Result & Conclusion • The addition of Expanded Clay

increases the degree of hydration, producing a denser microstructure leading to better curing.

The internally cured concrete is proved to be better than conventionally cured concrete by all means.

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The improved hydration also reduce micro cracking as a result of the lower shrinkage tendency of concrete with lightweight aggregate (Expanded clay) used for internal curing.

Result :-Results will be obtained after testing of cubes.

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Work done-a) Topic selection b) Literature surveyc) Material investigationd) Mix designe) Workability testf) Quantitative analysis

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Work to be donea) Castingb) Curing c) Testingd) Paper presentatione) Thesis compilation

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THANK YOU