冻融循环试验下的高速公路混凝土配合比优化研究  

Study on Mix Proportion Optimization of Expressway Concrete Under Freeze-Thaw Cycle Test

作　　者：孙凤鹏 SUN Fengpeng(China Railway 21st Bureau Group Co.Ltd.,Lanzhou Gansu 730070,China)

机构地区：[1]中铁二十一局集团有限公司,甘肃兰州730070

出　　处：《铁道建筑技术》2024年第4期88-92,共5页Railway Construction Technology

基　　金：甘肃省自然科学基金研究项目(22JR5RA382)。

摘　　要：特殊环境下高速公路混凝土抗冻性能较差,本文设计一种基于冻融循环试验的高速公路混凝土优化配合比。选择市售与自制两种不同减水剂以及8%、15%和30%三种掺量的粉煤灰初步配制高速公路混凝土,通过冻融循环试验最终确定最优高速公路混凝土配合比,并观察使用不同融雪剂在冻融循环试验中混凝土性能变化情况。试验结果表明,选取抗冻性能较为稳定15%掺量的粉煤灰配制高速公路混凝土在冻融循环后具有较高强度;使用无机盐融雪剂不会对混凝土路面造成破坏,从而提高高速公路的使用寿命。本文所设计的混凝土强度较高,具有较强抗冻性能,满足高速公路施工需求。The frost resistance of expressway concrete is poor under special environment,so a optimum mixture ratio of expressway concrete is designed in the paper based on freeze-thaw cycle test.Two kinds of water reducing agents that is sold in the market or self-made,and three kinds of fly ash with the content of 8%,15%and 30%,were selected to preliminarily prepare expressway concrete,and the optimum mixture ratio of expressway concrete was determined through freeze-thaw cycle test,and the change of concrete during freeze-thaw cycle tests using different snow melting agents was observed.The test results show that the concrete used in expressway prepared with 15%fly ash,which has relatively stable frost resistance,has high strength after freeze-thaw cycle test.The use of inorganic salt snow melting agent will not seriously damage the strength of concrete,and improve the service life of expressway.The designed concrete has high strength and strong frost resistance,meeting the requirements of expressway construction.

关 键 词：高速公路 混凝土 配合比优化 冻融循环试验 

分 类 号：TU528[建筑科学—建筑技术科学] TU502