Project on Concrete Mix Design for various grades of Concrete
concrete mix design for M35 grade concrete with fly ash
step1- stipulations for proportioning
grade of concrete :M35
type of cement :OPC 43 grade conforming to IS 3812
type of mineral admixture : fly ash confirming to IS 3812
maximum nominal size of aggregate :20mm
minimum cement content : 320 kg/m3
maximum water cement ratio :0.45
workability : 100mm slimp value of pumpable concrete
exposure condition : severe
method of concrete placing : pumping
maximum cement content :450kg/m3
step 2:
test date for materials
cement used :OPC 43 grade confiming to IS 8112
specific gravity of cement:3.15
fly ash : conforming to IS 3812
SPECIFIC GRAVITY OF flay ash :2.2
specific gravity of CA : 2.74
fine aggregate : 2.74
water absorption CA; 0.5%
fine aggregate : 1%
step 3: to find target mean strength of mix proportioning
target mean streghth f'ck=fck+1.65s=35+1.65*5=43.25
N/m
step 4
selection of water cement ratio
maximum water cement ratio=0.45
on experience water cemet ratio =0.4
0.4<0.45 hence ok
step 5 : calculation of water cement content
maximum water content for 20mm aggregate =186litres
for 100mm slump =186+(6/100)*186=196litres
STEP 6: calculation of cement content
water cement ratio =0.4
cementatious material =140/0.4=350kg/m3
in table 5 of IS 456:2000 the cement content for severe exposure =320kg/m3
350kg/m3 > 320kg/m3
hence ok
design of M50 grade concrete
step 1 : stipulation for proportioning
grade designation :M50
type of cement : OPC grade 43 confirming to IS 8112
maximum nominal size of aggregate : 20mm
maximum cement content : 320kg/m3
maximum water cement ratio =0.45
workability : 100mm, slump value of pumpable concrete
maximum cement content :450kg/m3
step2 : test data for materials
cement used :OPC 43 grade confirming to IS 8112
specific gravity of cement : 3.15
specific gravity of : CA : 2.74
fine aggregate : 2.74
water absorpation
CA =0.5%
fine aggregate =1%
step 3 : to find target mean streghth for proportiong
fc'k =fck +1.65s=50+1.65*5=58.25