废旧水泥构造物再生水泥混凝土工作性能影响因素分析

Analysis of Influencing Factors on Workability of Recycled Cement Concrete from Waste Cement Structure

采用因素分析和正交分析的方法,确定废旧水泥构造物再生水泥混凝土工作性能的影响因素。试验结果表明:再生粗集料取代率在0%~50%时,粗集料替代率与坍落度之间基本呈现线性关系,坍落度随粗集料替代率的升高而降低,整体坍落度损失不大。采取集料强化后,水泥混凝土坍落度增加,提升效果的顺序为化学强化>物理强化>不强化。影响再生集料水泥混凝土坍落度因素的主次顺序则是水灰比>水泥掺量>是否进行强化>再生粗集料替代率。

In this paper,the influencing factors on the workability of recycled cement concrete from waste cement structures were determined by means of factor analysis and orthogonal analysis.The results showed that there was a linear relationship between the replacement rate of recycled coarse aggregate and the slump when the replacement rate was 0%~50%.The slump decreased with the increase of the coarse aggregate substitution rate,and the total slump loss was small.After adopting aggregate strengthening,the slump of cement concrete increased,chemical strengthening> physical strengthening>,non-strengthening.The order of the factors that affected the slump of recycled aggregate cement concrete was:water cement ratio> cement content> strengthening> the replacement rate of recycled coarse aggregate.