纳米改性混凝土路用性能试验研究  

Test and Study of Nanometer Modified Concrete for Pavement Performance

作　　者：孟宪金[1] 牛贺洋 程格格 MENG Xian-jin;NIU He-yang;CHENG Ge-ge(School of Civil and Transportation Engineering,Yellow River Conservancy Technical Institute,Kaifeng 475004,China)

机构地区：[1]黄河水利职业技术学院土木与交通工程学院,开封市475004

出　　处：《公路》2019年第2期54-58,共5页Highway

基　　金：中央高校基本科研业务费专项资金项目;项目编号CHD2016ZD011

摘　　要：为研究纳米CaCO_3改性混凝土的路用性能,对掺量为0、0.5%、1.0%和1.5%的纳米CaCO_3改性混凝土进行抗压强度、弯拉强度、冻融循环、干缩、断裂韧性及灼烧试验,测得不同纳米CaCO_3掺量下混凝土的抗压强度、弯拉强度、干缩量、断裂韧度、化学结合水含量及不同冻融循环次数下混凝土的弯拉强度损失、质量损失和相对动弹模量。研究结果表明:掺入纳米CaCO_3后,路用混凝土的弯拉强度、抗冻性能、断裂韧度均有所提高,且掺量为1%时性能最佳;掺入纳米CaCO_3,对抗压强度影响不大,但增加了混凝土的干缩量,对路面是不利的;纳米CaCO_3可加快水泥水化速度,增加水泥水化程度,改善混凝土界面过渡区,是提高混凝土路用性能的主要原因。In order to study the pavement performance of nanometer CaCO3 modified concrete,compressive strength,flexural-tensile strength,freeze-thaw cycle,drying and shrinkage,fracture toughness and calcination tests are carried out on nanometer CaCO3 modified concrete with the dosage of 0,0.5%,1.0% and 1.5%.Compressive strength,flexural-tensile strength,rate of drying and shrinkage,fracture toughness,content of chemically combined water,loss of flexural-tensile strength,loss of weight,and relative modulus are obtained.The results indicate that the flexural-tensile strength,anti-frost property and fracture toughness are improved after the nanometer CaCO3 being mixed,and 1% dosage is the best;there is minor change on compressive strength,but the rate of drying and shrinkage is increased significantly,which is adverse for the pavement.The nanometer CaCO3 can accelerate the speed of cement hydration,increase the extent of cement hydration,improve the interface transition zone of concrete,and these are the main reasons for the nanometer CaCO3 improving the pavement performance of concrete.

关 键 词：道路工程 路用水泥混凝土 纳米材料 冻融循环 干缩 断裂韧性 灼烧 

分 类 号：U416.216[交通运输工程—道路与铁道工程]