Project on Concrete Mix Design for various grades of Concrete
MIX DESIGN FOR M35 GRADE
1.ASSUMED STIPULATIONS FOR PROPORTIONING
A) GRADE DESIGNATION :M35
B) TYPE OF CEMENT : OPC 43 GRADE CONFORMING TO IS 8112
C) TYPE OF MINERAL ADMIXTURE :FLY ASH CONFORMING TO IS 3812 (PART1)
D) MAX.NOMINAL SIZE OF AGGREGATE : 20MM
E) MINIMUM CEMENT CONTENT:340KG\M3(FROM TABLE 5 OF IS 456-2000-EXPOSER CONDITION)
F)MAXIUM WATER CEMENT RATIO:0.45(FROM TABLE 5 OF IS 456-2000-EXPOSER CONDITION)
G)WORKABILITY:100MM(SLUMP VALUE FOR PUMBABLE CONCRETE)
H)EXPOSER CONDITION: VERY SEVERE(RCC)
2. FROM TABLE ONE OF IS 10262:2009,STANDARD DEVIATION=5MPA
THEREFORE,TARGET STRENTH=35+(1.65*5)=43.25MPA
3.FROM TABLE 5 OF IS456-2000 FOR VERY SEVERE EXPOSERE, MAX.W/C RATIO=0.45
CALCULATION OF WATER CEMENT RATIO
STEP 1:
HERE, 28 DAYS OF COMPRESSIVE STRENTH OF CONCRETE=TARGET MEAM STRENTH =43.25MPA
ASSUME W/C RATIO : 0.37
STEP 2:
FROM GRAPH 2 OF IS10262
WE USE CURVE E.
WE ASSUE W/C RATIO= 0.46
LEAST OF THE ABOVE W/C RATIO WE ADOPT =0.37
4.SELECTION OF WATER CONTENT
FROM TABLE 2 OF IS10262:2009,MAX WATER CONTENT FOR 20MM AGGREGATES =186KG(25-50MM SLUMP)
ESTIMATED WATER CONTENT FOR 100MM SLUMP=186+((6/100)*186)=197KG
AS SUPER PLASTISIZER IS USED,THE W/C IS REDUCED UPTO 30%
WE CAN ADOPT =28%
HENCE ARRIVED WATER CONTENT=197*0.72=141.84KG
5.CALCULATION OF CEMENT CONTENT
W/C RATIO =0.37
CEMENTETIOUS MATERIAL (CEMENT+FLY ASH)=141.84/0.37=383.35KG
FROM TABLE 5 OFIS456-2000 MIN.CEMENT CONTENT FOR VERY SEVERE EXPOSURE CONDITION =340KG/M3
384>340,0K
NOW,TO PROPORTION FLY ASH THE FOLLOWING STEPS ARE SUGGESTED
1. THE %OF FLY ASH NEEDED TO BE DECIDED BASED ON PROJECT REQUIREMENT AND QUALITY OF MATERIALS
2. IN SOME CASES,INCREASE IN CEMENTETIOUS MATERIAL CAN BE WARRANTED.INCREASE IN CEMENTETIOUS MATERIAL AND ITS % MAY BE BASED ON EXPERIENCE AND TRIALS (THIS EXAMPLE IS WITH INCREASE OF 10% CEMENTETIOUS MATERIAL CONTENT)
CEMENTETIOUS CONTENT =-384*1.1=422.45KG
WATER CONTENT = 141.84KG
FLY ASH@30% = 422.4*0.3=126.72KG
CEMENT(OPC) = 422.4-126.72=295.68KG
6.PROPORTION OF VOLUME OF COARSE AND FINE AGGREGATE CONTENT
FROM TABLE 3 OF IS 10262 VOL.OF CA CORRESPONDING TO 20MM AGGREGATE ANF FINE AGGREGATE (ZONE1) FOR WATER-CEMENT RATIO 0.5=0.6
IN THE PRESENT CASE W/C RATIO =0.37
- THEREFORE, THE VOLUME OF CA NEEDS TO BE INCREASED TO DECREASE THE FINE AGGRADE CONTENT .
- AS WC RATIO IS LOWERED BY 0.1 ALMOST THE PROPORSITION OF VOLUME OF CA IS INCREASED BY A 0.02(@0.01 FOR EVERY 0.05 CHANGE IN WE RATIO )
THEREFORE CORRECTED VOLUME OF CA AGGRADE FOR W\C RATIO OF .37=0.62
FOR PUMPABLE CONCRETE THIS VALUES ARE REDUCED BY 10%
THEREFORE,VOLUME OF CA=0.62*0.9=0.56
THE VOLUME OF FA=1-0.56=0.44
7. MIX CALCULATIONS:
A)THE VOLUME OF CONCRETE =1M3
B)THE VOLUME OF CEMENT=(295.68/3.15)*(1/1000)=0.0938M3
C)THE VOLUME OF FLYASH=(126.72/2.2)*(1/1000)=0.0576M3
D)THE VOLUME OF WATER =(141.84/1000)=0.142M3
E)THE VOLUME OF AGGREGATE=(1-(0.0938+0.0576+0.142))=0.7066
F)THE MASS OF CA AGGREGATE =0.7066*0.56*2.74*1000=1084.2KG
G)THE VOLUME OF FINE AGGREGATE=0.716*0.44*2.74*1000=852KG
8.MIX PROPORTATION OF M35
CEMENT =295.68KG/M3
FLYASH =126.72KG/M3
WATER =141.84KG/M3
FA =852KG/M3
CA =1084.2KG/M3
W/C RATIO =0.37
THEREFORE MIX PROPORTION IS =1:2.01:2.56
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M50 DESIGN MIX
1.ASSUMED STIPULATIONS FOR PROPORTIONING
A) GRADE DESIGNATION :M50
B) TYPE OF CEMENT : OPC 43 GRADE CONFORMING TO IS 8112
C) TYPE OF MINERAL ADMIXTURE :FLY ASH CONFORMING TO IS 3812 (PART1)
D) MAX.NOMINAL SIZE OF AGGREGATE : 20MM
E) MINIMUM CEMENT CONTENT:340KG\M3(FROM TABLE 5 OF IS 456-2000-EXPOSER CONDITION)
F)MAXIUM WATER CEMENT RATIO:0.45(FROM TABLE 5 OF IS 456-2000-EXPOSER CONDITION)
G)WORKABILITY:100MM(SLUMP VALUE FOR PUMBABLE CONCRETE)
H)EXPOSER CONDITION: VERY SEVERE(RCC)
2. FROM TABLE ONE OF IS 10262:2009,STANDARD DEVIATION=5MPA
THEREFORE,TARGET STRENTH=50+(1.65*5)=58.25MPA
3.FROM TABLE 5 OF IS456-2000 FOR VERY SEVERE EXPOSERE, MAX.W/C RATIO=0.45
CALCULATION OF WATER CEMENT RATIO
STEP 1:
HERE, 28 DAYS OF COMPRESSIVE STRENTH OF CONCRETE=TARGET MEAM STRENTH =58.25MPA
ASSUME W/C RATIO : 0.33
STEP 2:
FROM GRAPH 2 OF IS10262
WE USE CURVE E.
WE ASSUE W/C RATIO= 0.35
LEAST OF THE ABOVE W/C RATIO WE ADOPT =0.30
4.SELECTION OF WATER CONTENT
FROM TABLE 2 OF IS10262:2009,MAX WATER CONTENT FOR 20MM AGGREGATES =186KG(25-50MM SLUMP)
ESTIMATED WATER CONTENT FOR 100MM SLUMP=186+((6/100)*186)=197KG
HENCE ARRIVED WATER CONTENT=197kG
AS SUPERPLASTISIZER IS USED WE VAN REDUCE WATER BY 22PERCENT -30PERCENT
SO WATER CONTENT =197*.78=153.66KG
5.CALCULATION OF CEMENT CONTENT
W/C RATIO =0.33
CEMENT QTY =153.66/0.33=465.63KG
FROM TABLE 5 OFIS456-2000 MIN.CEMENT CONTENT FOR VERY SEVERE EXPOSURE CONDITION =380KG/M3
465.63>380,0K
CEMENTE QTY. =465.63KG
WATER QTY = 153.66KG
6.PROPORTION OF VOLUME OF COARSE AND FINE AGGREGATE CONTENT
FROM TABLE 3 OF IS 10262 VOL.OF CA CORRESPONDING TO 20MM AGGREGATE ANF FINE AGGREGATE (ZONE1) FOR WATER-CEMENT RATIO 0.5=0.6
IN THE PRESENT CASE W/C RATIO =0.33
- THEREFORE, THE VOLUME OF CA NEEDS TO BE INCREASED TO DECREASE THE FINE AGGRADE CONTENT .
- AS WC RATIO IS LOWERED BY ALMOST 0.2 THE PROPORSITION OF VOLUME OF CA IS INCREASED BY A 0.04(@0.01 FOR EVERY 0.05 CHANGE IN WE RATIO )
THEREFORE CORRECTED VOLUME OF CA AGGRADE FOR W\C RATIO OF .33=0.64
FOR PUMPABLE CONCRETE THIS VALUES ARE REDUCED BY 10%
THEREFORE,VOLUME OF CA=0.64*0.9=0.576
THE VOLUME OF FA=1-0.576=0.424
7. MIX CALCULATIONS:
A)THE VOLUME OF CONCRETE =1M3
B)THE VOLUME OF CEMENT=(465.63/3.15)*(1/1000)=0.147M3
C)THE VOLUME OF WATER =(153.66/1000)=0.154M3
E)THE VOLUME OF AGGREGATE=(1-(0.147+.154))=0.699
F)THE MASS OF CA AGGREGATE =0.699*0.576*2.74*1000=1103.20KG
G)THE VOLUME OF FINE AGGREGATE=0.698*0.424*2.74*1000=812KG
H)ADMIXTURE IS TAKEN AS 1.2 PERCENT BY WT OF CEMENT.
SO .01*465.63=5KG(APOROXIMATELY)
8.MIX PROPORTATION OF M50
CEMENT =465.63KG/M3
WATER =153.66KG/M3
FA =812KG/M3
CA =1103.2KG/M3
W/C RATIO =0.33
THEREFORE MIX PROPORTION FOR M50 TRAIL1 =1:1.75:2.37