碳酸钙晶须对再生骨料混凝土性能影响

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中图分类号：TU528 文献标志码：A 文章编号：1008-0562（2026）01-0052-07

Effect calcium carbonate whiskers on the properties recycled aggregate concrete

YANJie1²，FENGLonghui'，LIANG Chongyang'，WANG Xiaoyu'， YANG B01 ，XIE Jun1，2 ，HE Yan3* （1. ， UniversityArchitecture， ，;2. Diagnosis，Reconstructionand Anti-disaster ， 075000， ;3.Colege Chemistryand Chemical ， Guangxi University，Nanning 53004， ） Abstract： To enhance the mechanical properties and chloride ion penetration resistance recycled aggregate concrete （RAC），RAC specimens were prepared by incorporating calcium carbonate whiskers （CW） with different content （volume fraction）.The compressive strength，spliting tensile strength，and chloride migration coeficient were measured.The underlying mechanisms were analyzed using scanning electron microscopy （SEM） and the nitrogen adsorption method.The results indicate that the optimal performance RAC is achieved with a 25% recycled aggregate （RA）replacement rate and a 0.8% CW volume fraction. However， excessive CW incorporation leads to agglomeration，which diminishes the improvement in RAC properties.CWoptimizes the RAC matrix morphology through mechanisms such as pore-filing and crack-bridging，thereby improving its performance. These findings provide a theoretical foundation for the application CW in RAC.

Keywords： recycled aggregate concrete （RAC）； calcium carbonate whiskers （CW）； compressive strength; splitting tensile strength; chloride ion penetration resistance

0 引言

随着城市化进程的加快及建筑行业的快速发展，日益增多的建筑废弃物占用了大量土地资源，产生不容忽视的环境问题[1-2]。（剩余11416字）