再生混凝土单位体积用水量的实验研究

将废弃混凝土进行循环再利用已越来越引起各国的高度重视，再生混凝土能否用于结构承重，主要是看其强度能否满足要求，而配合比是决定其强度的一个重要因素，水灰比又是配合比中的一个关键参数，再生混凝土单位体积用水量怎样取值就成为一个重要的研究课题，本文对混合粗骨料 天然砂这一组合情况进行了实验研究，发现再生混凝土单位体积的用水量应在普通混凝土用水量的基础上增加，提出了额外增加用水量的计算公式，通过实验验证本文提出的额外增加用水量的计算公式与实验吻合较好，可供再生混凝土配合比设计作参考。

Experimental research on unit water use in recycled concrete

Recyling the descasting concrete caught more attention in the world. It depends on the strength for construction bearing to utilize recyled concrete. Mixture ratio is one key factor deciding strength, which is supported by a crucial parameter: water cement ratio. So the calculation of unit water use in recycled concrete is the hot topic. In this paper, the combinations of aggregate concerning recycled concrete are discussed. It is appropriate to adopt the form of full(or part)coarse aggregate adding natural sand. In the case of mixed coarse aggregate adding natural sand, the water in each unit of recycled aggregate concrete should be increased more than it in the ordinary concrete in the mix proportion design, the calculating formula for the increased water use is put forward, the extraly increased water use coincides better with the experimental data through verification, and the formula can be used as reference for the designer in recycled concrete mixed ratio.