Experimental Analysis of Stress in Cement Concrete Pavement with Base Cracks

Abstract

In order to analyze the stress varieties in cement pavement slabs caused by load with the existence of base cracks, the influences of moduli, crack locations and quantities of semi-rigid base and lean concrete base, thickness of cement concrete slab and size of load and other factors on the load stress of cement concrete pavement slab were analyzed through experimental simulation methods. The analysis result indicates that: (1) The road surface deflection increases with the number of base cracks increasing; (2) The tensile stress at the bottom of concrete slab decreases with the increase of base modulus and slab thickness, the increase in slab thickness more substantially minimizes stress than does the increase in base modulus; (3) The stress of concrete slab increases sharply with the presence of base cracks, and the slab bottom tensile stress increases with the number of base cracks increasing; (4) The load increase is an important factor causing load stress increase; so overload must be strictly controlled.