For a cement concrete pavement, the load, warping and frictional stresses on the slab are 240 N/mm2, 320 N/mm2 and 10 N/mm2 respectively. The critical combination of stresses during summer (mid day) season is:
1
550 N/mm2
2
570 N/mm2
3
560 N/mm2
4
320 N/mm2