振动条件下基于扩展度的低坍落度混凝土工作性评价  

Evaluation of w orkability of low slump concrete based on extensibility under vibration condition

作　　者：凌海宇 田波[2] 权磊[2] 胡师杰 LING Haiyu;TIAN BO;QUAN Lei;HU Shijie(College of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300132,China;Research Institute of Highway,Ministry of Transport,Beijing 100088,China)

机构地区：[1]河北工业大学土木与交通学院,天津300132 [2]交通运输部公路科学研究院,北京100088

出　　处：《混凝土》2018年第6期101-104,共4页Concrete

基　　金：广西科技计划项目(桂科AC16380105);民航科技项目(ZQT15043109);国际合作基金(2014DFR81000);国家自然科学基金青年科学基金项目(51608239);中国博士后科学基金(2016M600071)

摘　　要：基于混凝土振动液化特性以及坍落度扩展度试验原理,提出了振动扩展度的概念,针对不同低坍落度混凝土配合比(坍落度相同),测量了振动扩展度、振动黏度系数以及维勃稠度,试验结果证明了振动扩展度能够比对出不同配合比混凝土之间振动液化性能的差异,是评价低坍落度混凝土振动液化性能的全新的指标。从应用性角度出发,基于大数据着重研究了公路工程中常用的低坍落度混凝土的振动扩展度范围,综合考虑认为低坍落度混凝土振动扩展度的范围在39~45 cm区间能够满足工程实际的要求。从黏聚性角度出发,结合大量试验数据,给出了混凝土黏聚性经验评价指标。Based on the experimental principle of concrete lique faction and slump expansion degree, the concept of vibration expansiondegree is proposed.The vibration expansion coefficient, the vibration viscosity coefficient, the vibration viscosity coefficient and Weiboconsistency are measured for different lowslump concrete mixing ratio （slumpsame） .The test results show that the vibration expansion canbe compared with the different ratio of concrete about the vibration lique faction performance.Thus, vibration expansion degree is a newevaluation indicator about the lowslump concrete vibration lique faction performance.From the point of view of application, the range ofvibration expansion of lowslump concrete commonly used in highway engineering is studied based on large data.Considering that the rangeof vibration expansion of lowslump concrete is in the range of 39-45 cm, it can meet the engineering practice request.From the point ofview of cohesion, combined witha lot of experimental data, the empiricale valuation index of concrete cohesion is given.

关 键 词：混凝土 振动 扩展度 低坍落度 工作性 

分 类 号：TU528.01[建筑科学—建筑技术科学]