加热改性再生混凝土粗骨料试验研究  

Experimental Investigation of Recycle Coarse Aggregate Modified by Heating Method

作　　者：苏燕[1] 古松[1] 常晓蕾[1] 李金星[1] 

机构地区：[1]西南科技大学土木工程与建筑学院,绵阳621010

出　　处：《混凝土与水泥制品》2015年第10期6-10,共5页China Concrete and Cement Products

基　　金：绵阳市科技计划项目(12G031-4);四川省循环经济研究中心项目(XHJJ-0918);西南科技大学研究生创新基金(14YCX091)

摘　　要：采用加热法对简单破碎再生混凝土粗骨料进行正交试验改性研究。加热工艺的控制参数为加热温度、恒温时间,对加热后再生粗骨料表面附着砂浆的剥离方式采用混凝土振动台,控制参数为混凝土振动台振动时间。试验测试了改性前后再生骨料的吸水率、表观密度、压碎指标,采用极差分析法对正交试验结果进行分析。结果表明,加热温度可明显改善再生粗骨料性能,而增加恒温时间及振动台振动时间对提高再生粗骨料性能效果不显著。Heating method was adopted to improve the performance of simple crushed recycled coarse aggregate and the experiment method was the orthogonal test. Control parameters in heating process were the heating temperature and constant temperature time, and in the process of wiping out the surface mortar on heated recycled aggregate, the concrete vibrating table was used, the controlling parameter for this process was the vibration time. The rate of water absorption,apparent density, crush index of recycled coarse aggregate before and after the improving process were tested, and the range analysis results of orthogonal test show that controlling heating temperature can significantly improve the performance of recycled coarse aggregate, and the effect by increasing the time of constant temperature and vibration time to improve the recycled coarse aggregate performance is not significant.

关 键 词：加热 再生粗骨料 改性 正交试验 

分 类 号：TU528.041[建筑科学—建筑技术科学]