Table 5: Effect of (fʹc) on cracking and ultimate loads.

Slab
Designation
f′c (MPa) Pcr
(kN)
Pu
(kN)
Pcr/ Pu ΔPcr % ΔPu %
NCS1-0-50 33 9 29 0.43 130 151
MRPCS1-0-50 84 21 73 0.42
NCS1-0-70 33 12 41 0.36 190 212
MRPCS1-0-70 84 35 128 0.46
NCS2-0-50 33 12 42 0.26 150 130
MRPCS2-0-50 84 30 97 0.44
NCS2-0-70 33 15 56 0.22 160 160
MRPCS2-0-70 84 39 146 0.48