Effect of Thickness and Addition of Fly Ash and Rice Husk Ash on Temperature Differential and Warping Stresses in Rigid Pavements

摘要

Temperature is an important factor of influencing the functioning of concrete pavements. Pavement temperature differential causes thermal stresses in concrete pavements. The effects of the following factors on temperature differential and warping stresses in concrete pavement are studied: (a) Slab thickness, (b) Replacing the cement by 10% of fly ash and 5% of rice husk ash. Four slabs were cast, three without any addition of poyzalonic admixture, but with different thickness. The fourth slab was cast with the addition of 10% of fly ash and 5% of rice husk ash. The temperature is measured by using LM-35 sensors and temperature indicator. The temperature data is analyzed by Quadratic equation i.e. linear temperature profile, non-linear temperature profile and axial temperature profile for all the slabs. Computation of warping stresses in the concrete pavement due to the pavement slab in a warped state because of linear and non-linear temperature gradients is evaluated by using Westergaard analysis with Bradbury coefficient. The results of Westergaard analysis with Bradbury coefficient and Quadratic equation analysis are compared.