8th june project seminar
TRANSCRIPT
establishment OF "w/C“ ratio vs "strength" curve
Civil engineering department
GUIDED BY :prof. s. m. kale
PRESENTED BY :jadhav digvijay Pkale darshan PKulkarni himanshu Pnag nitesh Rsaraf tanay R
GOKHALE EDUCATION SOCIETY’S, R. H. SAPAT COLLEGE OF ENGINEERING, Nashik - 422 005
Head of deptartment :prof. m. m. thombre
W/C RATIO VS STRENGTH CURVE 01
To Establish''Water / Cement''
Ratiovs
''Strength” Curve
02W/C RATIO VS STRENGTH CURVE
Major problems arise because of W/C ratio
Lack of proper knowledge on site
After proper designing check suitability
03W/C RATIO VS STRENGTH CURVE
Abram's law.
Every given set has single W/C vs Strength curve
04W/C RATIO VS STRENGTH CURVE
W/C
To gauge performance of concrete for different W/C ratio on basis of Abram’s law
To achieve optimal content of concrete
To gauge performance of same set of materials of different W/C ratio and cement content
05W/C RATIO VS STRENGTH CURVE
We can estimate the required strength of concrete for different W/C ratio
We can also use it for different grades of concrete
06W/C RATIO VS STRENGTH CURVE
07W/C RATIO VS STRENGTH CURVE
Survey of various sites to get feedback regarding quality of materials
Need to establish standard procedure for mix design & casting of concrete
Collection of standard quality materials
Concrete mix design and it’s principle
W/C RATIO VS STRENGTH CURVE 08
Application of Abram’s law
Concrete mix design for given set of materials
Casting of mixes for different W/C ratio
Prepare W/C vs Strength curve
1.Designer Construction Pvt Ltd. (RMC Plant)
2.Vaishali Developers (Individual Builder)
3.Tropicana, Samrat Group (Mega Project)
09W/C RATIO VS STRENGTH CURVE
1.Cement
2.Fly ash
3.Admixture
4.Aggregates10W/C RATIO VS STRENGTH CURVE
11W/C RATIO VS STRENGTH CURVE
Concrete mix design for given set of materials
Casting of mixes for different W/C ratio
Application of Abram’s law
Prepare W/C vs Strength curve
12W/C RATIO VS STRENGTH CURVE
13W/C RATIO VS STRENGTH CURVE
W/Cratio
Ambuja OPC 53 P 60 River
sand Crush sand 20 mm 10 mm Water Admixture
Density
0.55 206 69 534 534 694 463 150 3.19 2650
0.5 225 75 528 528 686 458 150 3.6 2650
0.45 250 83.3 520 520 676 451 150 3.996 2650
0.4 281 94 510 510 663 442 150 4.5 2650
0.35 323 107 497 497 646 430 150 5.16 2650
0.3 375 125 480 480 624 416 150 3 2650
0.25 450 150 456 456 593 395 150 3 2650
14W/C RATIO VS STRENGTH CURVE
SlumpCone
Water / Cement ratio
0.55 0.5 0.45 0.4 0.35 0.3 0.25
Initial 170 170 175 160 170 170 180
Final 140 150 155 155 130 130 -
W/C RATIO VS STRENGTH CURVE
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W/C ratio
Corom-andel
OPC 53
P 100 River sand
Crush sand 20 mm 10 mm Water Admixture Density
0.5 225 75 528 528 686 458 150 3.6 2650
0.4 281 94 510 510 663 442 150 4.5 2650
0.3 375 125 480 480 624 416 150 3 2650
0.25 450 150 456 456 593 395 150 3.6 2650
16W/C RATIO VS STRENGTH CURVE
Slump Cone
Water / Cement ratio
0.5 0.4 0.3 0.25
Initial 160 170 190 205
Final 100 160 160 -
17W/C RATIO VS STRENGTH CURVE
W/C RATIO VS STRENGTH CURVE 18
W/C 1 Day 3 Days 7 Days 28 Days 90 Days 180 Days
0.55 8.8 12.9 17 28.9 40.12 46.4
0.5 9.7 14.68 19.39 33.3 45.58 54.33
0.45 9.3 16.4 21.53 37.2 55.95 60
0.4 10.9 20.8 29.7 47.59 64.37 73.5
0.35 15.39 32.29 37.03 62.33 83.74 87.6
0.3 27 45.39 60.36 79.25 102.8 108.5
0.25 33.5 62.75 75.2 99.8 118.2 109.2
19W/C RATIO VS STRENGTH CURVE
20W/C RATIO VS STRENGTH CURVE
W/C 1 Day 3 Days 7 Days 28 Days 90 Days 180 Days
0.5 4.3 9.8 15 30 38 49
0.4 6.2 15 24 43 57 65
0.3 13 36 53 77 89 102
0.25 14 42 61 94 102 101
W/C RATIO VS STRENGTH CURVE
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Failure pattern
W/C RATIO VS STRENGTH CURVE
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W/C Ratio vs Strength Curve : As W/C ratio decreases, strength increases As W/C ratio is reduced below 0.4 there is steep
increase in strength of concrete Age vs Strength Curve: Exponential increase in strength up to 28 days
and there after a stable rise We can estimate the desired strength of
concrete mix by comparison with our standard curves
23W/C RATIO VS STRENGTH CURVE
Set 1 Set 2
W/c 28 Days 90 Days180
DAYS
0.55 28.9 38.82% 60.55%
0.5 33.3 36.87% 63.15%
0.45 37.2 50.40% 61.29%
0.4 47.59 35.25% 54.45%
0.35 62.33 34.35% 40.54%
0.3 79.25 29.65% 36.90%
0.25 99.8 18.45% 9.42%
W/C RATIO VS STRENGTH CURVE
W/C 28 Days 90 Days 180 Days
0.5 30.25 26.61% 62.64%
0.4 43.36 31.00% 49.97%
0.3 76.56 16.37% 33.59%
0.25 94.25 8.27% 7.16%
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We conclude that water/cement ratio plays very important role in concrete
Abram’s law holds good for given set of material
As the water in cement paste reduces, strength increases, as result we can get higher strength of concrete for low water cement ratio
Optimization of performance of concrete can be done by these standard curves
25W/C RATIO VS STRENGTH CURVE
• Omotola Alawode, P.G.Dip.1* and O.I. Idowu, M.Sc.2 “Effects of Water-Cement Ratios on the Compressive Strength”.
•Dale P Bentz and Pierre-Claude Aitcin “The hidden meaning of water-cements ratio”.
•Tarun R. Naik, Shiw S. Singh, Amr S. Hassaballah, “Effects of water to cementitious ratio on compressive strength of cement mortar containing fly ash”, Fourth International Conference on Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete, May 1992, pg no. 1-23.
26W/C RATIO VS STRENGTH CURVE
• G. Appa rao, “Generalization of Abram’s law for cement mortars”, Cement and Concrete Research, issue November 2000, pg no. 495-502.
• Abhishek Jain & Nazrul Islam, “Use of fly ash as partial replacement of sand in cement mortar”, International Journal of Innovative Research in Science, Engineering and Technology, Vol. 2, Issue 5, May 2013, pg no. 1323-1332.
• A. Kilic, C.D. Atis, A. Teymen, O. Karahan, F. O¨ zcan, C. Bilim, M. O¨ zdemir, “The influence of aggregate type on the strength and Abrasion resistance of high strength concrete”, Cement & Concrete Composites, issue 2008, pg no. 290–296.
27W/C RATIO VS STRENGTH CURVE
• A. Nusrat and M. A. Tahir, “Mixture Proportioning of Fly Ash-Concretes Based on Mortar Strength and Flow Data” Mixture Proportioning of Fly Ash-Concretes Based on Mortar Strength and Flow Data, issue Jan 2008, Vol. 2, pg no. 6-13.
28W/C RATIO VS STRENGTH CURVE
‐ M.S.SHETTY “Concrete technology”, Volume 03, 3rd Edition, S. Chand & Company Ltd.
‐ M.L.GAMBHIR “Concrete technology”, Volume 03,Tata Mcgraw Hill Education, 3rd Edition.
‐ IS 10262-1982, Recommended Guidelines for concrete mix design.
‐ IS 2386-1963, Methods of Aggregate testing.‐ IS 10500, Water.‐ IS 1199-1959, Methods of Sampling & analysis of
concrete.
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‐ IS 383, Specification of coarse & fine Aggregate from natural source Feb-97 for Concrete (second revision).
‐ IS 4031-1988, Methods of Testing procedure of cement.
‐ IS 516-1959, Methods of test for Strength of concrete .
‐ IS 8112-1989, Specification for Ordinary Portland Cement.
‐ IS 9103-1999, Specification for Admixtures for concrete.
‐ IS 12269-2013, OPC 53 grade cement.
30W/C RATIO VS STRENGTH CURVE