time of transit
'vater-cement ratio
the air in the mix
size of aggregate
0.003
0.0003
0.00003
0.03
workability
strength
the effects of temperature variations
the unit weight
tcr - rcs = tct
fcr>fcs>fc.
fcr<fcs<fc>
fc5>fcr>fC.
0.33
0.5
0.75
1