摘要
采用由废弃混凝土制得的再生细骨料和再生粉体分别作为骨料和掺合料制备抹灰砂浆,选取萘系高效减水剂和抹灰砂浆用复合外加剂作为两种不同的外加剂,以此研究不同胶砂比下,再生粉体掺量和外加剂种类对再生骨料抹灰砂浆抗冻性能的影响。研究结果表明,随着胶砂比的减小和再生粉体掺量的增加,再生骨料抹灰砂浆的抗冻性能逐渐减弱,并且选用复合外加剂的砂浆抗冻性能优于选用萘系高效减水剂的砂浆抗冻性能。胶砂比1∶3时,其强度损失率和质量损失率平均值分别为18.65%、1.67%,胶砂比1∶5时则分别增大至34.13%、6.67%;再生粉体掺量为0时的砂浆强度损失率平均值为17.28%,质量损失率平均值为1.78%,然而当掺量为30%时,两者平均值依次达38.32%、6.98%。
In order to study the effect of different cement-sand ratio,recycled powder admixture and additives on the frost resistance of recycled aggregate plastering mortar,selecting naphthalene reducing and compound additive as two different additives,and using recycled fine aggregate and recycled powder from waste concrete respectively as aggregate and admixtures to prepare plastering mortar.The results show that with the decreases of cement-sand ratio and the increases of recycled powder admixture,the frost resistance of recycled aggregate plastering mortar decreased gradually,and the frost resistance that selecting compound admixture is superior to selecting the naphthalene super plasticizer.Cement-sand ratio of 1∶3,the strength loss rate and the mass loss rate of an average of 18.65%and 1.67%respectively,cement-sand ratio of 1∶5,that were increased to 34.13%and 6.67%;recycled powder admixture rate was 0,the strength loss rate of average value was 17.28%,the mass loss rate of average value was 1.78%,when the content was 30%,the values for each reached 38.32%and 6.98%.
作者
郭远新
李秋义
徐庆宝
刘桂宾
高嵩
单体庆
GUO Yuanxin;LI Qiuyi;XU Qingbao;LIU Guibin;GAO Song;SHAN Tiqing(Construction Engineering College,Qingdao Agricultural University,Qingdao 266109,China;School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Qingdao Qingjian New Materials Co.,Ltd.,Qingdao 266108,China)
出处
《混凝土》
CAS
北大核心
2018年第10期118-122,共5页
Concrete
基金
国家自然科学基金面上项目(51878366
51378270
51578297)
国家"111计划"高等学校学科创新引智计划资助
山东省自然科学基金重大基础研究项目(ZR2017ZC0737)
山东省博士后创新项目专项资金(201502003)
青岛市拆除建筑垃圾高效资源化关键技术与产业化应用研究项目(402019201700013)
关键词
再生骨料
再生粉体
抹灰砂浆
胶砂比
外加剂
抗冻性能
recycled aggregate
recycled powder
plastering mortar
cement-sand ratio
additive
frost resistance
