粉煤灰对高强混凝土徐变性能影响的试验分析和计算研究  

Experimental analysis and calculation research on influence of fly ash on creep performance of high strength concrete

作　　者：姜丁 李东[1] Jiang Ding;Li Dong(Department of Civil Engineering,Shanghai University,Shanghai 200444,China)

机构地区：[1]上海大学土木工程系,上海200444

出　　处：《建筑结构》2020年第3期81-84,共4页Building Structure

摘　　要：徐变函数的精确与否直接影响到混凝土徐变应力和变形等计算结果的精度。为修正徐变度幂指数函数表达式存在的待定系数多、计算工作量大等不足,依托试验数据,提出了对数函数表达式,可较方便地求解拟合公式中的各系数,计算精度能够满足工程要求;同时以粉煤灰、水胶比为试验变量,研究了两者对高性能混凝土徐变性能的影响,引入徐变度影响系数以综合反映粉煤灰掺量、水胶比以及加载龄期的影响程度。分析结果表明,计算值与实测结果较为吻合,徐变度影响系数可应用于掺粉煤灰混凝土的徐变预测模型。The accuracy of the creep function directly affects the accuracy of calculation results such as creep stress and deformation of concrete. In order to correct the deficiencies in the expression of the exponential function of the creep degree, such as the large number of undetermined coefficients and large calculation workload, a logarithmic function expression was proposed based on the experimental data to easily solve the coefficients in the fitting formula. The calculation accuracy met the engineering requirements. At the same time, the effects of fly ash and water-binder ratio on the creep performance of high-performance concrete were studied. The influence coefficient of creep degree was introduced to comprehensively reflect the effects of amount of fly ash, water-binder ratio and loading age. The analysis results show that the calculated values are in good agreement with the measured results, and the creep degree coefficient can be applied to the creep prediction model of fly ash concrete.

关 键 词：高强混凝土 徐变度 水胶比 粉煤灰 

分 类 号：TU528.31[建筑科学—建筑技术科学]