Response Analysis of Construction Waste Regenerated Pavement under Moving Load
In order to study the mechanical response of the reclaimed pavement of brick and concrete construction waste used for road base filling under moving load,laboratory tests are carried out on the compressive resilience modulus of the reclaimed mixture with different recycled aggregate content,and the mechanical properties of the reclaimed mixture are analyzed.The Abaqus finite element analysis software is used to establish a 3D road model of the reclaimed pavement,and the mechanical response of the reclaimed pavement under moving load is analyzed.Based on the orthogonal test,the sensitivity analysis of the influence of the thickness of the regenerated base layer,the thickness of the regenerated base layer and the content of reclaimed aggregate on the structural mechanical response is carried out.The results show that:(1)The reclaimed aggregate of construction waste has the characteristics of high crushing value,low density and high water absorption.The optimal water content and maximum dry density of reclaimed mixture increase and decrease respectively with the increase of recycled material content.The compressive resilience modulus of reclaimed mixture first increases and then decreases with the increase of recycled material content.It is recommended that the mixture amount should be less than 40％when the reclaimed aggregate is used for base paving,and the proportion of reclaimed aggregate should be strictly controlled.(2)Under the action of moving load,the dynamic response of construction waste reclaimed pavement has the phenomenon of"strain concentration"and"strain alternation",and the maximum vertical strain reaches 381.94 pe.(3)The influence of base thickness and subbase thickness on road performance of construction waste recycled pavement is greater than that of recycled aggregate content.The research results can provide theoretical basis and technical reference for the structural design of construction waste recycling pavement.
road engineeringroad baseconstruction wastemoving loadmechanical responseorthogonal test
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