水泥路面再生混凝土主要路用性能研究

Main Performances of Recycled Aggregate Concrete in Pavement Construction

通过系统的试验研究，获得了旧水泥路面板再生混凝土的主要路用性能技术指标（抗压强度、弯拉强度、耐磨性能等）及其随各种原材料与配合比因素的变化规律，并且分析了粉煤灰掺量对再生混凝土耐磨性能的影响规律，结果表明：旧水泥路面板破碎后再生骨料在骨料中的掺入量对再生混凝土的抗压强度、弯拉强度、耐磨性能等路用性能具有显著的影响，与相同配合比的新骨料混凝土相比较，再生混凝土28d龄期的抗压强度约低5．3％～23．3％，弯拉强度要低6．4％～19．6％，单位磨损量增大3．8％～25．8％，适量粉煤灰的掺入能够改善再生混凝土的耐磨性能，再生混凝土的主要技术性能符合相关要求，可以作为新建水泥路面的建筑材料。

Through systemic experiments, the main technical indexes of the application of recycled aggregate concrete prod- uct from waste cement pavement in pavement construction were presented, which included compressive strength, flexural strength and wear resistance. And their changing laws with raw material and mix ratio were then studied. The effects of fly ash on wear resistant ability of recycled aggregate concrete were also analyzed. The results indicate that the content of recy- cled aggregate concrete obtained from the fracture of old pavement slab has significant effect on the performances of recycled aggregate concrete, including compressive strength, flexural strength and wear resistance. Compared with the same mix ratio of the new aggregate concrete, the compressive strength and flexural strength of recycled aggregate concrete in 28 days age decrease by 5.3% -23.3% and 6.4% - 19.6% respectively, and the unit abrasion loss increases by 3.8% -25.85%. Mixed with the optimal amount of fly ash can improve the wear resistant ability of recycled concrete. The main technical properties of the recycled aggregate concrete conform to the current specification and the recycled aggregate concrete can be used in the new pavement construction.