早龄期再生块体混凝土抗压性能试验研究  

Experimental study on compressive behaviors of recycled lump concrete at the early age

作　　者：龚继豪 马玉玮 刘春晖 傅继阳[1] GONG Jihao;MA Yuwei;LIU Chunhui;FU Jiyang(Research Center for Wind Engineering and Engineering Vibration,Guangzhou University,Guangzhou 510006,China;Lianjian Construction Engineering Co.,Ltd.,Shenzhen 518000,China)

机构地区：[1]广州大学风工程与工程振动研究中心,广东广州510006 [2]联建建设工程有限公司,广东深圳518000

出　　处：《混凝土》2023年第8期48-53,59,共7页Concrete

基　　金：国家自然科学基金(52078149);“111”引智基地(D21021);广东省科技计划(2020A0505100006)。

摘　　要：分别探讨了龄期和不同取代率对再生块体混凝土抗压性能的影响,其中包括立方体抗压强度、圆柱体抗压强度、弹性模量和应力-应变曲线。结果表明:当再生块体取代率不高于30%时,不同龄期下立方体、圆柱体试件抗压强度均随再生块体取代率增大而提高。特别是当龄期为1 d时,最大增长幅度达到79%。此外,再生块体的掺入也能提高早龄期弹性模量。基于试验结果,得到了再生块体混凝土早龄期抗压强度的预测式。最后,通过研究再生块体混凝土微观结构随龄期增长的发展情况可知,再生块体旧水泥石-骨料界面过渡区是再生块体混凝土的最薄弱环节。The effects of curing ages and different recycled lump(RL)replacement ratios on the compressive behaviors of recycled lump concrete(RLC)were discussed,including the cubic compressive strength,cylindrical compressive strength,elastic modulus and stress-strain curve.According to the results,it can be found that when the replacement ratios of RL were not higher than 30%,the compressive strength of cubic and cylindrical specimens at different ages increased with the increase in the replacement ratios of RL.The maximum growth rate reached 79%when the curing age was 1 day.The use of RL can also improve the elastic modulus of RLC at early ages.Based on the test results,the prediction formula for the compressive strength of RLC at early ages was obtained.By studying the development of the microstructure of RLC with the curing ages,it can be found that the paste-aggregate interfacial transition zone of the RL was the weakest part of the microstructure of RLC.

关 键 词：再生块体混凝土 龄期 取代率 抗压性能 微观结构 

分 类 号：TU528.01[建筑科学—建筑技术科学]