摘要
为量化骨料粒径与取代率对再生砂浆收缩性能的影响,采用再生细骨料制备水泥砂浆,研究再生砂浆1 d内自生收缩和180 d内自生收缩以及干燥收缩变形.研究结果表明:随骨料粒径的减小,再生细骨料砂浆1 d内自生收缩变形逐渐降低,在24 h时再生细骨料砂浆的自生收缩值为普通砂浆的25.20%~69.68%,28 d之后再生砂浆的自生收缩变形开始大于普通砂浆,180 d时再生砂浆的自生收缩值较普通砂浆增加2.39%~10.70%;再生细骨料砂浆的干燥收缩随骨料粒径的减小而增大,180 d时再生砂浆的干燥收缩值与普通砂浆相比增加12.65%~50.30%;在骨料相同的前提下,随着再生细骨料取代率的增大,砂浆自生收缩变形可以得到有效缓解,干燥收缩变形也逐渐减小;与骨料与水泥体积比(S/C)取1相比,当S/C分别取2和3时再生砂浆的180 d干燥收缩值分别降低41.90%和55.83%.该研究可为再生细骨料砂浆收缩性能研究补充试验数据,对后续相关研究具有一定的参考价值.
To quantify the effect of aggregate particle size and replacement ratio on the shrinkage performance of recycled mortar,cement mortar was prepared by recycled fine aggregate.Autogenous shrinkage within 1 d,autogenous shrinkage within 180 d,and dry shrinkage deformation of recycled mortar were studied.The results show that:With the decrease in aggregate particle size,the autogenous shrinkage deformation of recycled fine aggregate mortar gradually decreases within 1 d.At 24 h,the autogenous shrinkage value of recycled fine aggregate mortar is 25.20%~69.68%of that of ordinary mortar.After 28 d,the autogenous shrinkage deformation of recycled fine aggregate mortar begins to be greater than that of ordinary mortar.At 180 d,the autogenous shrinkage value of recycled mortar increased by 2.39%~10.70%compared with that of ordinary mortar.The drying shrinkage of recycled fine aggregate mortar increases with the decrease of aggregate particle size,and the drying shrinkage value of recycled fine aggregate mortar at 180 d is increased by 12.65%~50.30%compared with that of ordinary mortar.Under the premise of the same aggregate,with the increase of the replacement rate of recycled fine aggregate,the autogenous shrinkage deformation of mortar can be effectively alleviated,and the dry shrinkage deformation also gradually decreases.Compared with S/C at 1,when S/C set at 2 and 3,the dry shrinkage value of recycled mortar at 180 d decreases by 41.90%and 55.83%,respectively.This study can supplement some test data for the shrinkage property research of recycled fine aggregate mortar and has a certain reference value for subsequent related research.
作者
杜威
王文富
方敏杰
杨闯
李春毅
DU Wei;WANG Wenfu;FANG Minjie;YANG Chuang;LI Chunyi(China State Construction Railway Investment&Construction Group Co.,Ltd.,Nanchang 330038,China;China Construction Third Engineering Bureau Group Co.,Ltd.,Nanchang 330038,China)
出处
《湘潭大学学报（自然科学版）》
CAS
2024年第1期109-117,共9页
Journal of Xiangtan University(Natural Science Edition)
基金
国家自然科学基金(51808351)
辽宁省应用基础研究计划(2022JH2/101300130)。
关键词
骨料粒径
取代率
再生细骨料
再生砂浆
收缩性能
particle size
replacement ratio
recycled fine aggregate
recycled mortar
shrinkage performance
作者简介
杜威(1986-),男,湖北仙桃人,工程师.E-mail:412236599@qq.com。
