公路路面基层水泥稳定碎石强度和模量分析  

Analysis of the Strength and Modulus of Cement Stabilized Crushed Stone for Highway Pavement Base

作　　者：邹俊 ZOU Jun(Xiantao Sida Highway Construction Co.,Ltd.,Xiantao,Hubei 433000,China)

机构地区：[1]仙桃市四达公路建设有限公司,湖北仙桃433000

出　　处：《黑龙江交通科技》2024年第12期6-10,共5页Communications Science and Technology Heilongjiang

摘　　要：为了减小公路路面的病害,提高路面在运行期间的安全性,需合理选择水泥稳定碎石的强度和模量。以G312国道项目的半刚性基层路面为研究对象,分析了水泥稳定碎石的强度和模量变化机理,基于室内试验,分析了水泥稳定碎石在水泥掺量为3.0%、4.0%、5.0%、6.0%时,养护龄期为7、14、28、56、90d时的强度和模量变化规律,并利用路面计算软件建立计算模型,计算了路面结构在标准轴载和超载作用下的层底拉应力。研究成果表明:水泥掺量越大、养护龄期越长,水泥稳定碎石的强度和模量越大,且强度呈线性变化,模量变化速度先快后慢。当水泥掺量≥4.0%、养护龄期≥7 d时,水泥稳定碎石基层的强度和模量满足规范要求。同时,水泥稳定碎石基层的最大层底拉应力<1.1 MPa,说明强度和模量取值合理。In order to reduce the damage of highway pavement and improve the safety of pavement during operation,it is necessary to choose the strength and modulus of cement stabilized crushed stone reasonably.Taking the semi-rigid base pavement of G312 National Highway project as the research object,the strength and modulus variation mechanism of cement stabilized crushed stone were analyzed.Based on indoor experiments,the strength and modulus variation laws of cement stabilized crushed stone were analyzed at cement content of 3.0%,4.0%,5.0%,6.0%,and curing age of 7、14、28、56、90 d.A calculation model was established using pavement calculate software to calculate the tensile stress at the bottom of the pavement structure under standard axle load and overload.The research results show that the higher the cement content and the longer the curing age,the greater the strength and modulus of cement stabilized crushed stone,and the strength changes linearly,while the modulus changes rapidly at first and then slowly.When the cement content is≥4.0%and the curing age is≥7 d,the strength and modulus of the cement stabilized crushed stone base meet the specification requirements.At the same time,the maximum tensile stress at the bottom of the cement stabilized crushed stone base is less than 1.1 MPa,indicating that the strength and modulus values are reasonable.

关 键 词：公路工程 沥青路面 水泥稳定碎石 抗压强度 弯拉强度 弹性模量 

分 类 号：U416[交通运输工程—道路与铁道工程]