粒径对加速碳化再生细骨料性能的影响  

Effects of particle size on properties of fine recycled fine aggregate by accelerated carbonation

作　　者：丁亚红[1] 宁威 武军[1] 李雅婧 张美香[1] 郭猛 郭书奇 DING Yahong;NING Wei;WU Jun;LI Yajing;ZHANG Meixiang;GUO Meng;GUO Shuqi(School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454000,Henan,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000

出　　处：《河南理工大学学报（自然科学版）》2023年第5期190-196,共7页Journal of Henan Polytechnic University（Natural Science）

基　　金：国家自然科学基金资助项目(U1904188)。

摘　　要：为了解决再生细骨料性能劣化问题,采用饱和石灰水溶液预处理加速碳化法,以不同粒径再生细骨料(recycled fine aggregate,RFA)为研究对象,进行吸水率、压碎值和表观密度测试,并采用热分析(TG)、X射线衍射(XRD)和扫描电子显微镜(SEM)等对碳化产物和微观结构进行测试。结果表明,随着RFA粒径减小,吸水率逐渐变大,压碎值和表观密度变小;加速碳化生成的方解石紧密堆积并填充于RFA内部微裂缝,使其吸水率、压碎值降低,表观密度升高;小粒径RFA具有更高的CO_(2)质量吸收率,RFA粒径越小,吸水率降幅越明显;天然骨料碎屑聚集在0.3~0.6 mm的RFA中,阻碍了CO_(2)的吸收,其吸水率降幅最低。In order to solve the problem of performance degradation of recycled fine aggregate(RFA),saturated lime water solution(CH)pre-treatment was used to accelerate carbonization.The crushing value,water absorption rate and apparent density of recycled fine aggregate with different particle sizes were tested.The carbonization products and microstructure were characterized by thermal analysis,X-ray diffraction,scanning electron microscopy.The results indicated that with the decrease of RFA particle size,water absorption gradually increased,crushing value and apparent density decreased.The calcite formed by accelerated carbonization was filled in the internal microcracks of RFA,which reduced the water absorption and crushing value and increased the apparent density.Small particle size RFA had higher CO_(2) mass absorption rate,and the smaller the particle size of RFA is,the more obvious the decrease of water absorption rate is.Debris of natural aggregate groups in RFA with 0.3~0.6 mm,hindered the absorption of CO_(2),and the water absorption rate decreased the lowest.

关 键 词：再生细骨料 粒径 加速碳化 CO_(2)质量吸收率 吸水率 

分 类 号：TU528[建筑科学—建筑技术科学]