江苏大学学报(自然科学版)

作者：李琼,冯琼,曹辉

单位：兰州理工大学 土木工程学院, 甘肃 兰州 730050

关键词：recycled concrete,aggregate,compressive strength,SEM,XRD

基金：<p>甘肃省青年科技基金资助项目（2017GS10910）</p>

To investigate the influence of recycled coarse aggregates on the mechanical properties of concretes, various compressive strength tests of the cube at different ages were carried out using the concretes with a single gradation of 5.0 mm to 10.0 mm, 10.0 mm to 20.0 mm, 16.0 mm to 31.5 mm and continuous gradation from 5.0 mm to 31.5 mm and with the replacement rate of 30%，50% and 70%. The effects of aggregate on the mechanical properties of recycled concrete were revealed at microscopic level by scanning electron microscopy(SEM) and Xray diffraction(XRD). The results show that for low dosage, the strength at 112 d is almost the same as that of ordinary concrete when the size of aggregate content ranges from 5.0 mm to 10.0 mm. No matter how many dosages are selected, all the compressive strengthes of different age cubes are low when the aggregate content size ranges from 10.0 mm to 20.0 mm. When the aggregate content size ranged from 16.0 mm to 31.5 mm and 5.0 mm to 31.5 mm, the strength of recycled concrete is increased with an appropriate dosage.

来源：2019年第5期

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