摘要
为适应我国干混砂浆标准,依据富勒公式和泰波理论对于n值的取值范围,绘制了符合我国套筛筛孔尺寸的富勒曲线,按照其机制砂级配取值范围进行水泥砂浆试验,结果表明,当n≥0.45时,砂浆泌水率高,抗压强度低,流动性差,批刮费力,收缩率高,将不合适的n值剔除后得到缩小范围的富勒曲线,并据此用不同比例的机制砂中砂和细砂配制砂浆,标出其在干混砂浆富勒曲线中的位置,测试结果表明多数处于曲线范围之内的砂浆抗压强度高,泌水率低,施工省力,不黏抹刀,收缩率低,处于级配范围之外的砂浆性能较差。结论认为,符合富勒曲线且线形平顺圆滑的机制砂颗粒级配良好。
To meet our standards of dry-mixed mortar,Fuller Curve drawn in line with our mesh size and initially identified the scope of composition.Its foundation was n value range of Fuller formula and Teppo theory.The mortar were prepared with manufactured sand according to Fuller Curve.When n≥0.45,the bleeding rate of mortar was high,mobility was bad,the scraping was laborious,the shrinkage rate was high.The Fuller curve of dry-mixed mortar was get excluding inappropriate n value.This narrowed the composition scope of Fuller curve.The mortar was prepared with different proportions sand and fine sand,and its position was marked in the Fuller curve of dry-mixed mortar.The test results showed that the compressive strength of mortar's curve within the composition scope was high,the bleeding rate was low,the scraping was saving,the shrinkage rate was low,and its non-stick spatula.The mortar's performance was slightly worse when its curve section within the composition scope,and it was worse when outside the scope.It concluded fromabove that the grain composition of dry-mixed mortar was good when its curve met the Fuller curve of dry-mixed mortar and its linear was smooth.
作者
黄星浩
张欣
李哲
陈颖
胡迎新
刘鹏
HUANG Xinghao;ZHANG Xin;LI Zhe;CHEN Ying;HU Yingxin;LIU Peng(Changsha Planning and Design Institute Co.,Ltd.,Changsha,Hunan 410016,China;National university technology construction investment Co.,Ltd.,of Changsha Yuelu Mountain,Changsha,Hunan 410000,China;School of Architecture and Art,Central South University,Changsha,Hunan 410004,China;School of Civil Engineering,Central South University,Changsha,Hunan 410004,China;School of Civil Engineering,Central South University of Forestry and Technology,Changsha 410004,China;Hunan Zhongda Design Institute Co.,Ltd.,Changsha,Hunan 410004,China)
出处
《混凝土》
CAS
北大核心
2019年第4期97-101,共5页
Concrete
基金
国家自然科学基金课题(51778632
51408614)
中国博士后科学基金(2016M600675
2017T100647)
湖南省自然科学基金(2017JJ3385
2018JJ2525)
深圳市科技计划项目(JCYJ20170818143541342
JCYJ20180305123935198)
关键词
机制砂
颗粒级配
抗压强度
manufactured sand
grain composition
compressive strength
