全组分再生砂粒度及掺量对干混砂浆性能影响研究  

Effect of particle size and content of whole-component recycled sand on the performance of dry mixed mortar

作　　者：张苹[1] 谢汝朋[1] 李秋义[1] ZHANG Ping;XIE Rupeng;LI Qiuyi(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033

出　　处：《混凝土》2018年第10期115-117,122,共4页Concrete

基　　金：国家自然科学基金项目资助(51378270;51578297);青岛市博士后应用项目资助

摘　　要：研究了胶砂比1∶5下全组分再生砂的粒度组成和取代率对干混砂浆性能的影响,试验使用不同粒度的全组分再生砂取代天然砂,取代率分别为25%、50%、75%、100%。研究了干混砂浆的表观密度,保水率,2 h稠度损失率及抗压强度。试验结果表明:随着再生砂细度模数的减小,砂浆用水量增加;试验所有配合比下相比用天然砂,再生砂干混砂浆均表现出用水量增加及强度下降的趋势,但<4.75、<2.36 mm的两种连续级配再生砂基本可满足干混砂浆规范要求。在用RS3、RS4再生砂取代天然砂时,用水量急剧增加伴随强度急剧下降,分析认为与再生砂中含有的大量再生微粉有关。The effects of replacement percentages and particle size of whole-component recycled sand aggregates on the properties of dry-mixed mortar were investigated.All the mixtures were proportioned with a fixed cement/aggregate ratio of 1∶5.The replacement ratios were 25%,50%,75%and 100%.Properties such as apparent density and water retention ratio,as well as 28-day compressive and 2 h consistency loss rate of the mortar were studied.The results show that the water demand of the mortar increased with decreasing fineness modulus of the fine aggregate.All mixtures showed higher water absorption and lower compressive strength than the control mortar with natural sand,however,the specification of dry mixing mortar can be basically satisfied when using continuous gradation sand with particle size less than<4.75 mm and<2.36 mm.With the use of RS3 and RS4,sharp decreases in compressive strength and significant increases in water consumption occurred,and the analysis suggested that this phenomenon may be partially related to the large amount of recycled powder contained in the recycled sand.

关 键 词：干混砂浆 全组分再生砂 粒度组成 取代率 

分 类 号：TU528.01[建筑科学—建筑技术科学]