地聚合物稳定建筑固废再生集料力学特性研究  

Mechanical Properties of Geopolymer‑Stabilized Recycled Aggregates from Construction Solid Wastes

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作  者:袁开新 何永健 张来君 李海[2] 许戈韦 YUAN Kaixin;HE Yongjian;ZHANG Laijun;LI Hai;XU Gewei(China Road&Bridge Corporation,Beijing 100001,China;National Engineering Laboratory of Highway Maintenance Technology,Changsha University of Science&Technology,Changsha,Hunan 410114,China)

机构地区:[1]中国路桥工程有限责任公司,北京市100001 [2]长沙理工大学公路养护技术国家工程实验室,湖南长沙410114

出  处:《中外公路》2024年第6期75-89,共15页Journal of China & Foreign Highway

基  金:中国交通建设集团基金资助项目(编号:P2200001)。

摘  要:为解决建筑固废产量急剧增加且利用率不足的问题,该文以矿渣-粉煤灰基地聚物为无机结合料,用建筑固废再生集料代替天然碎石,将城市道路基层作为目标,研究不同掺量下地聚物稳定再生集料的力学性能。研究结果表明:随着地聚物掺量的增加,混合料的最大干密度增加,最佳含水率上升;混合料的无侧限抗压强度随着地聚物掺量、养护龄期的增加而提高,随着再生集料掺量的增加而下降;混合料劈裂强度与抗压回弹模量的变化规律与无侧限抗压强度相似,随着前体矿渣掺量、地聚物掺量、养护龄期的增加而上升,随着再生集料掺量的增加而下降。In order to solve the problem of a sharp increase in construction solid wastes and insufficient utilization rate,this paper took slag-fly ash-based geopolymer as an inorganic binder,replaced natural gravels with recycled aggregates from construction solid wastes,and set urban road base layer as the target scene to study the mechanical properties of geopolymer-stabilized recycled aggregates at different contents.The results show that with the increase in geopolymer content,the maximum dry density of the mixture increases.The optimum moisture content increases.The unconfined compressive strength of the mixture increases with the increase in geopolymer content and curing age and decreases with the increase in recycled aggregate content.The variation law of splitting strength and compressive rebound modulus of the mixture is similar to that of unconfined compressive strength.It increases with the increase in precursor slag content,geopolymer content,and curing age and decreases with the increase in recycled aggregate content.

关 键 词:建筑固废 强化改性 地聚物 道路基层 力学性能 

分 类 号:U414[交通运输工程—道路与铁道工程]

 

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