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投稿时间：2020-03-19 修订日期：2020-06-20
投稿时间：2020-03-19 修订日期：2020-06-20
中文摘要: 为了研究再生粗骨料的释水特性，将粘贴应变片的再生粗骨料埋入C30强度等级混凝土中，直接测试混凝土在干燥收缩过程中内部再生粗骨料的收缩应变，通过不同湿度环境下再生粗骨料的应变与释水率之间的关系推算出混凝土内部再生粗骨料的释水特性，建立再生混凝土释水率与再生粗骨料释水率之间的关系。研究结果表明：再生粗骨料与天然粗骨料在吸释水过程中应变及饱和度曲线的趋势相对接近，且两种骨料干湿产生的应变变化具有相互可逆趋势；再生粗骨料与天然粗骨料的释水率与应变呈线性关系；混凝土内部粗骨料的收缩应变要小于试件的收缩应变，再生粗骨料及再生混凝土的收缩应变要大于天然骨料及混凝土的收缩应变；再生混凝土的释水率要大于内部再生粗骨料的释水率。
Abstract:The experiment focused on the absorption and drainage characteristics of recycled coarse aggregate. The recycled coarse aggregate bonded with strain gauges was embedded in C30 strength grade concrete, and the shrinkage strain of recycled coarse aggregate in concrete during drying shrinkage was measured directly. Based on the relationship between the strain and drainage rate of recycled coarse aggregate under different humidity conditions, the drainage characteristics of recycled coarse aggregate in concrete were calculated, and the relationship between the drainage rate of recycled coarse aggregate and the drainage rate of recycled coarse aggregate was established. The results showed that the trend line of strain and saturation curve of regenerated coarse aggregate was relatively close to that of natural coarse aggregate in the process of draining and drainage, and the strain variation caused by dry and wet of the two kinds of aggregate had a reversible trend. There was a linear relationship between the strain and the drainage rate of recycled coarse aggregate and natural aggregate. The shrinkage strain of coarse aggregate in concrete was smaller than that of specimen, and the shrinkage strains of recycled coarse aggregate and recycled concrete were larger than that of natural aggregate and concrete. The drainage rate of recycled concrete was higher than that of internal recycled coarse aggregate.
keywords: recycled aggregate concrete recycled aggregate drying shrinkage shrinkage strain drainage rate
文章编号：202000199 中图分类号：TU528.79 文献标志码：
基金项目:辽宁省教育厅基金项目（LJ2019JL023）；辽宁省“十百千高端人才引进工程”项目（50GD02）
| Author Name | Affiliation | |
| CUI Zhenglong | College of Civil Eng., Liaoning Technical Univ., Fuxin 123000, China | cui0815@126.com |
| ZHANG Han | College of Civil Eng., Liaoning Technical Univ., Fuxin 123000, China |
作者简介:崔正龙(1974-),男,副教授,博士.研究方向:建筑材料.E-mail:cui0815@126.com
引用文本：
崔正龙,张含.再生粗骨料释水特性对混凝土干燥收缩性能影响[J].工程科学与技术,2020,52(6):139-144.
CUI Zhenglong,ZHANG Han.Effect of Recycled Coarse Aggregate Suction and Drainage on Drying Shrinkage of Concrete[J].Advanced Engineering Sciences,2020,52(6):139-144.
引用文本：
崔正龙,张含.再生粗骨料释水特性对混凝土干燥收缩性能影响[J].工程科学与技术,2020,52(6):139-144.
CUI Zhenglong,ZHANG Han.Effect of Recycled Coarse Aggregate Suction and Drainage on Drying Shrinkage of Concrete[J].Advanced Engineering Sciences,2020,52(6):139-144.