再生混凝土抗渗性能试验研究

随着地下空间的不断开发,再生混凝土材料逐渐被应用到地下构筑物中.混凝土抗渗性能是地埋管等地下结构的重要性能指标,对再生骨料混凝土抗渗性能开展试验研究是其工程应用的基础.本文采用室内试验,探讨水灰比、再生骨料取代率、粉煤灰添加量等对再生混凝土吸水性能的影响,进一步分析不同条件下再生混凝土的抗渗性能随毛细吸水系数和扩散系数变化规律.研究结果表明,适当降低水灰比和再生骨料取代率以及添加粉煤灰将使再生混凝土的抗渗性能增强.本试验研究结果可为再生骨料混凝土埋管等地下结构设计提供参考.

Experimental Research on Impermeability of Recycled Concrete

With the continuous development of underground space,recycled concrete materials are gradually being applied to underground structures. The water permeability resistance of concrete is an important performance index of underground structures such as buried pipes. The experimental study on the water permeability resistance of recycled aggregate concrete is the basis of its engineering application.In this paper,the effects of water-cement ratio,recycled aggregate replacement rate and fly ash addition on the water absorption performance of recycled concrete were investigated.The water permeability resistance of recycled concrete with different capillary water absorption coefficients and diffusion coefficients under different conditions was further analyzed.The results show that decreasing the water-cement ratio and the replacement rate of recycled aggregates and not adding fly ash will increase the water-resistant permeability of recycled concrete.The results of this test can provide reference for the design of underground structures such as recycled aggregate concrete pipes.