MINOR REPORT - To understand the behavior of strength and workability by changing the way of water addition
- 1. Dr. Akhilesh Das Gupta Institute of Technology & Management Prepared By: Ravi kr. Yadav (06315607917) Suraj Jha (08415603416) Sukanto Mette (08215603416) Shubham Kanauji (07715603416) Guided By: MR. VIKAS KATARIA MR. ANKUR TAYAL
- 2. MINOR PROJECT TO STUDY THE VARIATION IN WORKABILITY AND STRENGTH BY CHANGING THE PROCEDURE OF CONCRETE MIX
- 3. LIST OF CONTENTS Introduction Objectives Literature review Tests of cement Tests of course aggregate Tests of fine aggregate Methodology and proceeding Conclusions References
- 4. INTRODUCTION Workability is a property of raw or fresh concrete mixture. In simple words, workability means the ease of placement and workable concrete means the concrete which can be placed and can be compacted easily without any segregation. The strength of concrete is the most important property for us. It depends on density ratio or compaction and compaction depend on sufficient workability. Fresh concrete must have a workability as compaction to maximum density is possible with a reasonable amount of work.
- 5. Relation of compressive strength and workability with W/C ratio: Case 2 : Water cement ratio Decreases Compressive strength Increases Workability Decreases Case 1: Water cement ratio Rises Compressive strength decreases Workability Increases
- 6. OBJECTIVE To analyze the effect of different way of water addition in concrete with different grades keeping other parameters constant such as the coarse and fine aggregate size distribution and other material and instrumental parameters To determine the properties change such as compressive strength and workability in three different trials of concrete prepared .
- 7. LITERATURE REVIEW S.NO. AUTHOR WORK YEAR 1. Duval.R , E. H. Kadri Influence of silica fume on workability and the compressive strength of high performance concrete . The result show that partial cement replacement up to 10% silica fume does not reduce the concrete workability 1998 2. Ferraris,Chiara F. ,Karthik H. Obla, Russell Hill The influence of mineral admixture on the rheology of cement paste and concrete . rheology test on cement paste were used to successfully select the type and dosage of mineral admixture that improved the workability . Result show that ultrafine fly ash was determine to give the best result. 2001
- 8. S.NO. AUTHOR WORK YEAR 3. Siebal.E Air-void characteristic and freezing and thawing resistance of superplasticized air entrained concrete with high workability 1989 4. Zain,Muhammad Fauzi Mohd,Md Safiuddin,K.M.Yusof A study on the properties of freshly mixed high performance concrete in respect of slump, slump flow, V-funnel flow, air content, temperature, and unit weight. The result show that traditional slump test is not efficient to evaluate the workability and flow ability of performance concrete. 1999
- 9. S.NO. AUTHOR WORK YEAR 5. Gjory, Odd E. Workability: a new way of testing. New cements and new mineral and chemical admixtures affect the fresh concrete workability in a way that is not properly reflected by empirical test methods, therefore to take a more basic approach to the testing and specification of the fresh concrete workability by coaxial cylinders viscometer. 1998 6. Deepa Balakrishnan, K. C. Paulose Workability and strength characteristic of self compacting concrete containing fly ash and dolomite powder. for all levels of cement replacement concrete achieved superior performance in the fresh and mechanical tests compared with the reference. 2013
- 10. TESTS OF CEMENT NORMAL CONSISTENCY TEST : Water cement ratio Depth of penetration from bottom 32% 35mm 34% 17mm 36% 10mm 38% 0mm 36.25% 6mm
- 11. INITIAL FINAL SETTLING TIME TEST : Cement =400gm Water= (0.85) * (36.25/100) * (400) = 125gm Results: Initial settling time =17 min Final settling time =10 hr 13min
- 12. SOUNDNESS TEST : Wt Of Cement = 400g Normal Consistency = 36.25% Since Water Added = (0.78)*(400)*(36.25)/100 = 113.1 g RESULT : Mean expansion = 0.1 mm Of three samples
- 13. Passing through IS Sieve, mm Retained on IS Sieve, mm Wt. Of aggregate retained in gram 20 16 45 16 12.5 77 12.5 10 32 10 6.3 1 6.3 Pan 0 FLAKINESS INDEX = (TOTAL WT. PASSING THROUGH VARIOUS THICKNESS GAUGE) * (100) (TOTAL WT. OF SAMPLE TAKEN) = ( 45+77+32+1)*100 877 = 17.67% TESTS OF AGGREGATE FLAKINESS INDEX:
- 14. Passing through IS Sieve, mm Retained on IS Sieve, mm Wt. Of aggregate retained in gram 20 16 35 16 12.5 141 12.5 10 45 10 6.3 46 6.3 Pan 0 ELONGATION INDEX = (TOTAL WT. RETAIN THROUGH VARIOUS THICKNESS GAUGE ) * 100 (TOTAL WT. OF SAMPLE TAKEN) = ( 35+141+45+46)*100 777 = 34.36% ELONGATION INDEX
- 15. SPECIFIC GRAVITY OF COARSE AGGREGATE : DESCRIPTION SAMPLE IN (gm) Wt. Of sample 1000 Wt. Of vessel +sample + water (A) 3372 Wt. Of vessel+ water (B) 2754 Wt. Of saturated and surface dry sample (C) 990 Wt. Of oven dry sample(D) 982 = D / { C - ( A – B ) } = 2.64
- 16. WATER ABSORPTION OF COARSE AGGREGATE : = (C-D) * 100 D = (990-982) * 100 982 = 0.81% DESCRIPTION SAMPLE IN GM Wt. Of sample 1000 Wt. Of vessel +sample + water (A) 3372 wt. Of vessel+ water (B) 2754 Wt. Of saturated and surface dry sample (C) 990 Wt. Of oven dry sample(D) 982
- 17. Sieve size (mm) Wt. Retained (kg) Percentage retained Cummulative % retained Percentage finer 40 0 0 0 100 20 0.782 26.06 26.06 73.94 16 0.555 18.49 44.55 55.45 12.5 0.873 29.11 73.66 26.34 10 0.56 18.8 92.46 7.54 4.75 µ 0.229 7.63 100 0 2.36 µ 0 0 100 0 SIEVE ANALYSIS OF COARSE AGGREGATE :
- 18. FINE AGGREGATE : Sieve Analysis : Sieve in mm Wt. Retain in gram 4.75 1 2.36 108 1.18 294 600 543 300 48 150 3 pan 1
- 19. TYPES OF SLUMP
- 20. CONCRETE MIX 1 : 1 : 2 M25 grade 1 : 1.5 : 3 M20 grade TRIAL 1 TRIAL 2 TRIAL 3 METHODOLOGY
- 21. TRIAL 1 (Conventional method) DESIGN MIX CONCRETE + 0.5 W/C RATIO RESULTS CTM TEST = 150 KN WORKABILITY = ZERO SLUMP
- 22. TRIAL 2 ( 24 hr WATER DIPPED AGGREGATE ) DESIGN MIX CONCRETE + (0.5 W/C RATIO) – (ADSORBED WATER) = EXTERNALLY ADDED WATER * Total water in concrete is 0.5 w/c ratio RESULTS CTM TEST = 220 KN WORKABILITY = TRUE SLUMP
- 23. TRIAL 3 ( 24 hr WATER DIPPED AGGREGATE ) + ( OVEN DRIED ) DESIGN MIX CONCRETE + ( 0.5 W/C RATIO ) + ( ADSORBED WATER ) = EXTERNALLY ADDED WATER * Total water is greater than 0.5 w/c ratio in concrete RESULTS CTM TEST = 185 KN WORKABILITY = SHEAR SLUMP
- 24. 150 220 185 0 50 100 150 200 250 M20 trial 1 trial 2 trail 3 YaxisisstrengthinKN Fig :- Strength variation of different trials in M20
- 25. 180 300 225 0 50 100 150 200 250 300 350 M25 trial 1 trial 2 trial 3 YaxisisstrengthinKN Fig :- Strength variation of different trials in M25
- 26. GRADE 1:1.5:3 • TRIAL 1 = ZERO SLUMP • TRIAL 2 = TRUE SLUMP • TRIAL 3 = SHEAR SLUMP GRADE 1:1:2 • TRIAL 1 = ZERO SLUMP • TRIAL 2 = TRUE SLUMP • TRIAL 3 = SHEAR SLUMP WORKABILITY COMPARISON
- 27. CONCLUSION From the above three trials we can see that trail 2 is giving best results that is the 24 hr water dipped aggregate . So we conclude that if we are using 24 hr water dipped coarse aggregate in concrete then we will get following improved results. We will get better efficiency in terms of workability of concrete. We will get better efficiency in terms of Strength of concrete. The cost of overall project can be minimized.
- 28. REFERENCES IS 383-2016 (table no. 7 &9) IS 1199-1959 (page no. 8) IS : 4031 (Part 4) 1988 : Determination of consistency of standard cement paste. IS : 4031 (Part 5) 1988 : Determination of initial and final setting times . IS : 4031 (Part 3) 1988 : Determination of soundness of cement. IS : 2386 (Part 3) 1963 : Determination of finness modulus of aggregate. IS : 10262 (2009) : Guidelines for concrete mix design proportioning. IS : 383 ( 2016) : Coarse and fine aggregate for concrete- specifications.
- 29. Thank you