不同掺量矿渣混凝土早期热膨胀系数试验研究及预测模型构建  

Experimental study and prediction model construction for thermal expansion coefficient of concrete with different content slag at early ages

作　　者：黄杰[1] 帅映勇[1] 杨斌[2] HUANG Jie;SHUAI Yingyong;YANG Bin(School of Building Engineering,Taizhou Polytechnic College,Taizhou 225300,China;School of Architecture and Civil Engineering,Jiangsu Open University,Nanjing 211816,China)

机构地区：[1]泰州职业技术学院建筑工程学院,江苏泰州225300 [2]江苏开放大学建筑工程学院,江苏南京211816

出　　处：《混凝土》2022年第12期82-85,共4页Concrete

基　　金：国家自然科学基金项目(51279051);江苏省高等学校自然科学研究项目(17KJB560010)。

摘　　要：热膨胀系数是混凝土结构早期开裂评价重要计算参数在早龄期并非常量,而矿渣混凝土的使用符合绿色低碳发展理念。通过对不同矿渣掺量混凝土早期热膨胀系数进行了试验研究,得到其早期热膨胀系数时变曲线,分析了矿渣掺量对热膨胀系数的影响机理,提出了考虑矿渣掺量变化的混凝土时变预测模型。研究表明:矿渣掺量增加,混凝土早期稳定时的热膨胀系数先增大后减小,且掺量30%时有最大值。研究结果可为混凝土结构早期应力分析提供试验依据和参数选择。As an important calculation parameter for early cracking evaluation of concrete structures,the thermal expansion coefficientis not constant at early age,and the use of slag concrete conforms to the concept of green and low-carbon development.The early thermal expansion coefficient of concrete with different slag content is experimental studied,the time-varying curve of early thermal expansion coefficient is obtained,the influence mechanism of slag content on thermal expansion coefficient is analyzed,and a concrete time-varying prediction model considering the change of slag content is proposed.The research shows that with the increase of slag content,the thermal expansion coefficient of concrete at the early stage of stability first increases and then decreases,and has a maximum value when slag content is 30%.The research results can provide experimental basis and parameter selection for early stress analysis of concrete structures.

关 键 词：混凝土 矿渣 热膨胀系数 早龄期 预测模型 

分 类 号：TU528.041[建筑科学—建筑技术科学]