中流动性混凝土工作性与砂浆流变特性相关性研究  

Correlation between Medium Fluidity Concrete Workability and Mortar Rheological Properties

作　　者：南雪丽[1,2] 李荣洋 姬建瑞 王毅[1,2] 陈浩[1,2] NAN Xueli;LI Rongyang;JI Jianrui;WANG Yi;CHEN Hao(School of Material Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,Gansu,China;State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,Gansu,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050

出　　处：《重庆交通大学学报（自然科学版）》2022年第4期81-86,95,共7页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：甘肃省住房和城乡建设厅科技项目(JK2017-15)。

摘　　要：基于剩余浆体膜厚理论和砂浆流变阈值理论,采用砂浆流变试验和混凝土坍落扩展度试验,对中流动性混凝土工作性与其等效砂浆流变特性之间的相关性进行研究,以实现通过砂浆流变特性预测调整中流动性混凝土工作性的目的。研究结果表明:1 m^(3)混凝土中粗骨料体积随着砂浆膜厚的增加而减小,且当粗骨料级配曲线、表观密度、振实密度一定时,剩余砂浆膜厚与粗骨料体积满足二次函数关系;自密实混凝土的砂浆流变阈值理论在中流动性混凝土中具有较好的适用性,可以运用该理论模型对中流动性混凝土流变学研究进行指导;在粗骨料物理性能和掺量确定的情况下,中流动性混凝土工作性与其等效砂浆流变特性具有很好的相关性,可以通过测试砂浆的流变性能来预测或者调整中流动性混凝土的工作性。Based on residual slurry film thickness theory and mortar rheological threshold theory,the mortar rheological test and concrete slump flow test were used to study the correlation between the workability of medium fluidity concrete and its equivalent mortar rheological properties,so as to achieve the purpose of predicting and adjusting the workability of medium flow concrete through the rheological properties of mortar.The research result show that the volume of coarse aggregate in 1 m^(3)concrete decreases with the increase of mortar film thickness,and when the gradation curve,apparent density and vibration density of coarse aggregate are constant,the excess mortar film thickness and coarse aggregate volume meet the relationship of quadratic function.The mortar rheological threshold theory of self-compacting concrete has good applicability in medium fluidity concrete,and the theoretical model can be used to guide the rheological research of medium fluidity concrete.When the physical properties and dosage of coarse aggregate are determined,the workability of medium fluidity concrete and the rheological properties of its equivalent mortar have good correlation.The workability of medium fluidity concrete can be predicted or adjusted by testing the rheological properties of mortar.

关 键 词：道路工程 砂浆 流变特性 中流动性混凝土 工作性 剩余浆体膜厚理论 

分 类 号：U414[交通运输工程—道路与铁道工程]