不同石粉掺量机制砂混凝土弹性模量预测  

Prediction of elastic modulus of machine-made sand concrete with different stone powder content

作　　者：颜志铭 韦昌永 梁军林 容洪流[1,3] 傅涛 兰一夫 YAN Zhiming;WEI Changyong;LIANG Junlin;RONG Hongliu;FU Tao;LAN Yifu(College of Civil Engineering,Guangxi University,Nanning 530004,China;Guangxi Expressway Development Center,Nanning 530028,China;Guangxi Special Geological Highway Safety Engineering Technology Research Center,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西壮族自治区高速公路发展中心,广西南宁530028 [3]广西特殊地质公路安全工程技术研究中心,广西南宁530004

出　　处：《混凝土》2023年第4期12-16,共5页Concrete

基　　金：国家自然科学基金(52268064);广西科技创新引导项目(AC16380107)。

摘　　要：将不同掺量的石粉(按质量分数的0、3%、5%、7%、9%、12%、15%)掺入机制砂混凝土中,进行立方体抗压强度试验与弹性模量试验,得到机制砂混凝土立方体抗压强度最大时的石粉掺量,分别用Voigt上限、Reuss下限、广义自洽法和Mori-Tanaka方法预测不同石粉掺量下机制砂混凝土的有效弹性模量,并与规范中立方体抗压强度换算有效弹性模量和实测弹性模量对比,比较哪种方法更适用于预测不同石粉掺量下的机制砂混凝土。结果表明:机制砂混凝土立方体抗压强度最大时对应的石粉掺量为12%;7 d实测弹性模量比规范理论弹性模量平均大12.70%,28 d实测弹性模量比规范理论弹性模量平均大18.54%;Mori-Tanaka法预测的弹性模量与实测弹性模量之间的相对误差最小,因此更适用于预测不同石粉掺量下的机制砂混凝土弹性模量。Mix different contents of stone powder(0,3%,5%,7%,9%,12%,15%by mass fraction)into machine-made sand concrete,and carry out cube compressive strength test and elastic modulus test.Obtain the stone powder content at the maximum compressive strength of the machine-made sand concrete cube,and use the Voigt upper limit,Reuss lower limit,generalized self-consistent method and Mori-Tanaka method to predict the effective elastic modulus of machine-made sand concrete with different stone powder contents,and compare them with the specifications.Comparing the effective elastic modulus converted from the cubic compressive strength with the measured elastic modulus,compare which method is more suitable for predicting machine-made sand concrete with different stone powder content.The results show that when the compressive strength of the machine-made sand concrete cube is maximum,the corresponding stone powder content is 12%.The measured elastic modulus on 7 d is 12.70%larger than the theoretical elastic modulus on average,and the measured elastic modulus on 28 d is larger on average 18.54%than the theoretical elastic modulus.The relative error between the elastic modulus predicted by the Mori-Tanaka method and the measured elastic modulus is the smallest,so it is more suitable for predicting the elastic modulus of machine-made sand concrete with different stone powder content.

关 键 词：机制砂混凝土 弹性模量 石粉 立方体抗压强度 

分 类 号：TU528.01[建筑科学—建筑技术科学]