再生混凝土力学性能提升技术与应用

针对大量混凝土废弃物造成生态环境日益恶化及天然骨料资源日益缺乏的问题,通过配制不同强度等级和不同再生骨料掺量的再生混凝土,并结合锡澄运河三级航道整治工程对再生混凝土力学性能及其提升技术进行试验研究。结果表明:再生骨料的掺量对C35及以下中低强度混凝土力学性能影响较小,而对C40及以上中高强度混凝土有较大影响,随再生骨料掺量的增加,再生混凝土力学性能降低;通过合理选用再生骨料级配、与天然骨料复掺、对再生骨料进行强化以及优化配合比参数等措施能提升混凝土力学性能;锡澄运河三级航道整治工程实际应用取得了很好的技术经济效益。

Technique for improvement of mechanical properties of recycled concrete and its application

In view of the ecological deterioration caused by massive concrete wastes and the lack of natural aggregate resources, an experimental study on mechanical properties of recycled concrete and the technique for their improvement was carried out for the Xicheng Canal three-class waterway regulation project through preparation of the recycled concrete with different strength grades and different recycled aggregate contents. The results show that the content of recycled aggregates has a weak effect on the mechanical properties of C35 concrete and concrete with even lower strength, but has a large influence on C40 concrete and concrete with even higher strength. With an increase of the recycled aggregate content, the mechanical properties of the recycled concrete degrade. The mechanical properties of the recycled concrete can be improved by rationally determining the recycled aggregate gradation, mixing in natural aggregates, strengthening the recycled aggregates, and optimizing the mix ratio. The application of the technique to the Xicheng Canal three-class waterway regulation project has achieved large economic benefits.