废弃水泥混凝土道面在路面半刚性基层中再生利用的试验研究

水泥混凝土道路改建时形成的废弃混凝土块的有效利用是一个亟待解决的问题。通过对破碎、筛分后的废弃混凝土性能研究发现：再生料中含有部分结晶水,会影响最佳用水量和最大干密度的确定;再生粗集料和天然碎石具有相当的力学性能。对水泥稳定再生集料进行了配合比设计,并通过性能测试发现：水泥稳定再生集料具有较好的强度,抗冻性能,水稳定性能;和水稳天然集料的抗压回弹模量相当;抗收缩变形性能较差。控制再生细集料掺加量可以非常好的满足半刚性基层材料的要求。

Experimental Study of Recycling of Waste Concrete Cement Pavement in Semi-rigid Base Course

It is an important problem to make effective use of scrap concrete material during maintenance or reconstruction of a cement concrete road.By studying the waste concrete crushed and screened some results were obtained that the recycled aggregate contained water of crystallization which would affect the optimal amount of water and the determination of the maximum dry density.Recycled coarse aggregate and natural gravel had quite mechanical properties.Cement stabilized recycled mixtures’design were did and performance tests found that cement stabilized recycled aggregate has good strength,frost resistance,water stability.It had similar resilient modulus with cement stabilized natural aggregate and poor performance anti-shrinkage deformation.Control regeneration mixing amount of fine aggregate can be very good to meet the requirements of the semi-rigid base material.