Thermal field analysis of early-age concrete considering effects of degree of hydration on thermal conductivity

被引：1

作者：

Cui, Wei ^{[1
]}

Wu, Jiayi ^{[1
]}

Song, Huifang ^{[1
]}

机构：

[1] State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin

来源：

Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) | 2015年 / 45卷 / 04期

关键词：

Degree of hydration; Early-age concrete; Secondary development; Thermal field; Thermal parameters;

D O I：

10.3969/j.issn.1001-0505.2015.04.031

中图分类号：

学科分类号：

摘要：

In order to more accurately simulate the temperature field of early-age concrete, the temperature changing rules of early-age concrete are studied through the laboratory experiment. Based on the ABAQUS secondary development platform, considering early-age concrete thermal parameters (thermal conductivity and specific heat) changing along with the degree of hydration, the thermal field subroutine UMATHT and user subroutine FILM which is used to simulate the third boundary condition of thermal field are developed. On this basis, different temperature field computational models are used to simulate the test. By comparing the experimental results with the numerical simulation results, it is found that, considering the specific heat and thermal conductivity varying with the degree of hydration process, the numerical simulation results and the measured values are basically consistent, the maximum error of the peak temperature is controlled within 1.5% and the time error to reach peak temperature is controlled within 0.5 h. Without considering the two parameters varying with the hydration process, there is a big difference between numerical simulation and the measured values, peak temperature error is up to more than 4.6℃, and the time delay reaching the peak temperature is more than 5 h. Therefore, it is necessary to consider the thermal conductivity and specific heat varying with the degree of hydration when the temperature field of early-age concrete is analyzed. ©, 2015, Southeast University. All right reserved.

引用

页码：792 / 798

页数：6

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