王磊1，2，李泉龙2，陈杏2

（1 广西建筑新能源与节能重点实验室, 桂林 541004；

2 桂林理工大学土木与建筑工程学院， 桂林 541004）

［摘要］完成了0%,30%,50%,70%,100%再生粗骨料取代率下混凝土的弹性模量、湿热变形性能以及不同龄期的收缩率测试，分析了影响再生混凝土干缩性能的因素。研究结果表明，不同取代率的再生混凝土早期收缩率差值并不明显，收缩量与再生粗骨料取代率也无明显相关性，40～50d后，随着再生粗骨料取代率的提高，再生混凝土的干缩率显著增加，与天然混凝土收缩率之间的差值开始扩大，50～220d是再生混凝土与天然混凝土收缩率差距扩大的主要阶段，100%取代率再生混凝土和天然混凝土收缩率的差距由50d的1.4倍增加到220d的2.4倍；再生粗骨料取代率越高的再生混凝土收缩趋于稳定的龄期越长；再生混凝土的热胀率、吸水膨胀率随着再生粗骨料取代率的增加明显增大。除了水灰比等常规因素外，再生粗骨料中旧砂浆含量对再生混凝土变形性能的实际影响最大，并通过颗粒级配、再生粗骨料取代率等反映出来，实际工程中应合理控制再生粗骨料取代率以及小粒径再生粗骨料的比重。

［关键词］再生粗骨料； 再生混凝土； 取代率； 干缩性能； 砂浆含量

中图分类号：X799.1， TU528.041文献标识码：A文章编号：1002-848X(2016)02-0030-05

Deformation property and influencing factor analyses of recycled coarse aggregate concrete

Wang Lei1，2， Li Quanlong2， Chen Xing2

（1 Guangxi Key Laboratory of New Energy and Building Energy Saving， Guilin 541004， China；

2 College of Civil Engineering and Architecture, Guilin University of Technology,

Guilin 541004, China）

Abstract:Tests were carried out on concrete elastic modulus, wet and thermal expansion properties, shrinkage ratios of different ages of recycled coarse aggregate concrete with recycled coarse aggregate (RCA) replacement percentages of 0%, 30%, 50%, 70% and 100%. The factors influencing shrinkage performance of the recycled concrete were analyzed. The research results show that the gap of early age shrinkage of recycled concrete with different replacement ratios is not obvious. The relationship between shrinkage percentage and the RCA replacement ratio is not significant in early age. With the increase of the RCA replacement ratio after 40~50d age, the shrinkage ratio of  recycled concrete increases significantly and the gap of shrinkage ratio between recycled concrete and natural aggregate concrete begins to expand. The stage from 50d to 220d age is the main period when gap of shrinkage ratio between recycled concrete and natural aggregate concrete expands and the shrinkage ratio gap between RCA with 100% replacement ratio and natural concrete increases from 1.4 times at 50d to 2.4 times at 220d. The recycled concrete with higher RCA replacement ratio has a longer shrinkage age. The wet and thermal expansion ratio and swelling ratio of recycled concrete increase significantly with the increase of the RCA replacement ratio. In addition to the conventional factors as water-cement ratio, the old mortar content of RCA has the significant impact on the deformation performance of recycled concrete, which is reflected in particle size distribution and RCA replacement ratio. In practical engineering, RCA replacement ratio  should be reasonably controlled as well as percentage of RCA with small particle size.

Keywords:recycled coarse aggregate(RCA); recycled concrete； replacement ratio; shrinkage performance；mortar content

*国家自然科学基金（51268009），广西自然基金（2012GXNSFBA053151）,广西高校中青年骨干教师资助计划。

作者简介：王磊，博士，教授，Email：tianmu77@163.com。