A. fcr=0.35Vf7
B. fcr=0.57f7
C. fcr=0.7Vf7
D. fcr=1.2Vf7
where fcr and fck are in N/mm2′
A. reduces the strength
B. increases the strength
C. does not change the strength
D. all of the above
A. workability admixtures
B. accelerators
C. retarders
D. air entraining agents
A. 10 to 15% more
B. 15 to 20% more
C. 20 to 25% more
D. 25 to 50% more
A. gypsum
B. calcium chloride
C. sodium silicate
D. all of the above
A. Ec = = 5700
B. Ec = = 570
C. Ec = = 5700fck
D. Ec = where fck N/mm2 = 700 is the characteristic strength in
A. reduces workability
B. increases bleeding
C. increases shrinkage
D. increases strength
A. increase in water-cement ratio
B. increase in fineness of cement
C. decrease in curing time
D. decrease in size of aggregate
A. tcr – rcs = tct
B. fcr>fcs>fc
C. fcr<fcs
D. fc5>fcr>fC
A. aggregate cement ratio
B. time of transit
C. grading of the aggregate
D. all of above