轴压重复荷载作用后再生混凝土毛细吸水性能

Capillary Water Absorption of Recycled Aggregate Concrete after Repeated Axial Compressive Loading

研究了应力水平(0、0.3、0.5、0.7)和再生粗骨料取代率(0%、30%、50%、100%)对再生混凝土毛细吸水性能的影响规律;基于毛细吸水的非饱和流体理论和试验结果,引入Boltzmann变量并采用水力扩散系数的指数形式,建立了考虑应力水平和再生粗骨料取代率影响的再生混凝土内部相对含水量分布预测模型.结果表明:随着再生粗骨料取代率和应力水平的增加,再生混凝土的毛细吸水质量和吸水率呈增加趋势;当应力水平一定时,水分侵入深度随着再生粗骨料取代率的增加而变大.

The influences of stress level(0,0.3,0.5,0.7)and replacement ratio(0%,30%,50%,100%)of recycled aggregate on capillary water absorption of recycled aggregate concrete was studied.Based on the unsaturated flow theory and the obtained experimental results,the predicted model of water distribution within concrete considering the influence of stress level and recycled aggregate replacement ratio is established using the Boltzmann variable and the exponential-law of hydraulic diffusivity.The results indicate that capillary water absorption mass and sorptivity for recycled aggregate concrete show an increasing trend with the increase of recycled aggregate replacement ratio and stress level.Under a given stress level,the depth of water penetration into concrete increases with increasing recycled aggregate replacement ratio of recycled aggregates.