Experimental investigation and prediction model of fatigue performance of cement-stabilized permeable recycled aggregate materials from construction solid waste
To investigate the application and durability improvement of recycled aggregates from construction demolition wastes(CDWs)in cement-stabilized crushed stone base for permeable road.The marginal aggregates recycled from CDWs were used to partially replace natural virgin aggregates for preparing cement-stabilized permeable recycled aggregate(CPRAM)specimens.The unconfined compressive strength tests,permeability tests,and four-point bending fatigue tests were used to test the mechanical properties of CPRAM.The dissipated energy of the CPRAM specimens during the fatigue loading process was analyzed with energy theory,and the fatigue damage model was established based on the dissipated energy to analyze the fatigue damage evolution of the CPRAM specimens.The research results show that the compressive strength and coefficient of permeability of the CPRAM specimens satisfy the performance requirements specified for most types of roads in China.The cumulative dissipated energy of the specimens increases exponentially with the peak fatigue stress rises.The dissipated energy generated in a single fatigue stress loading and unloading cycle has a strong correlation with the fatigue stress ratio values,the dissipated energy of the specimens with fatigue stress ratio of 0.75 and 0.85 increases 50%and 200%,respectively,compared with that of the specimens with fatigue stress ratio of 0.55 in each fatigue.The proportion of recycled aggregate in the specimen is increased.The amount of dissipated energy generated in a single loading will be reduced.The fatigue damage variables and the relative rate of change of fatigue damage of the specimen will be shown to be different degrees of increase.The fatigue life prediction model based on the peak fatigue stress and fatigue damage evolution can predict the fatigue life of the CPRAM materials under different levels of fatigue stress reasonably well.The research results can provide a reference for further improve the engineering application and long-term safe service of recycled aggregates from CDWs in cement-stabilized crushed stone base for permeable road.
permeable road basebuilding demolition wastescement-stabilized recycled aggregate materialsfatigue damagefatigue life
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