机制砂级配对高强混凝土工作性能的影响  

Effects of Manufactured-sand Grade on Working Performance of High Strength Concrete

作　　者：艾志勇 李娟燕 舒小平 罗强 李青峰 熊志朋 张达 AI Zhiyong;LI Juanyan;SHU Xiaoping;LUO Qiang;LI Qingfeng;XIONG Zhipeng;ZHANG Da(Research and Development Center on Technologies and Equipment of Long-span BridgeConstruction Ministry of Transport, Jiangxi Transportation Institute, Nanchang 330200, China;Department of Road and Bridge Engineering, Jiangxi Vocationaland Technical College of Transportation, Nanchang 330013,China)

机构地区：[1]江西省交通科学研究院长大桥梁建设关键技术及装备交通运输行业研发中心,南昌330200 [2]江西交通职业技术学院路桥工程系,南昌330013

出　　处：《交通科技》2019年第3期135-138,共4页Transportation Science & Technology

基　　金：江西省交通运输厅重点工程科技计划项目(2017C0002);江西省交通运输厅科技计划项目(2017H0014);江苏省土木工程材料重点实验室开放课题基金项目(CM2018-06)资助

摘　　要：为探讨机制砂级配特性对混凝土工作性能的影响,通过试验结果对比,归纳了不同级配类型的机制砂对混凝土性能的作用效应。结果表明,机制砂各个筛档累计筛余量要合理控制在一定比例范围内;优良级配机制砂中,各档粒级(1.18~4.75,0.3~1.18,和0.075~0.3 mm)组分含量适当,其级配曲线特征呈拉伸正S形,级配不良机制砂中,各档粒级组分含量出现偏大或偏小,其级配曲线则呈抛物线或拉伸反S形;细度模数和空隙率并不能作为机制砂级配优劣的判断标准。In this paper, the influence of manufactured-sand grading characteristics on concrete performance was discussed and the effects of different grading types of manufactured-sand on concrete performance were summarized by comparison of the test results. The study concludes that the contents of components in various grades of manufactured-sand shall be reasonably controlled within a certain range. For the fine grading manufactured-sand, the contents of components in various grades(1.18~4.75 mm, 0.3~1.18 mm and 0.075~0.3 mm) is appropriate, and the gradation curve behaves in the same form of positive stretching ‘S’. While for the bad grading manufactured-sand, the contents of components in various grades are much larger or smaller, and the gradation curve behaves in the form of parabola curve or opposite stretching ‘S’. The fineness modulus and void ratio can not be used as the criterion for judging the advantages and disadvantages of the manufactured-sand.

关 键 词：机制砂 级配 混凝土 工作性能 

分 类 号：U444[建筑科学—桥梁与隧道工程]