Thermal Stress Analysis of Fly-ash Concrete with Cement Replacement Ratios up to 50%
Fly-ash concrete used in massive concrete structure has superior advantages to reduce hydration heat. On the other hand, the fly-ash concrete has negative property of low strength development at early age because pozzolanic reaction of fly-ash activates at mature age, such as after 28 days. To investigate these characteristics of fly-ash used in concrete, the present study discusses thermal cracking possibility of fly-ash concrete by using FE analysis software. The present study employs prediction formulae proposed by Zhang and Japanese design code in the simulations. The objects in this study are normal strength concrete mixed of fly-ash up to 50％ of replacement ratio to cement. The comparative investigations show that temperature effect is more significant than strength development at early age. Based on the analytical study, high volume fly-ash concretes of 30-50％ of the replacement ratio can be concluded as effective and useful materials to reduce the cracking possibility in massive concrete structures.
Fly-ash concrete Early Age Prediction Formulae for Strength Thermal Stress Analysis
Mingjie Mao Qiuning Yang Wenbo Zhang Isamu Yoshitake
School of Civil and Hydraulic Engineering, Ningxia University, Yinchuan, Ningxia, China Engineering Civil and Environmental Engineering, Yamaguchi University, Ube, Yamaguchi, Japan
国际会议
三峡
英文
2054-2057
2012-05-18（万方平台首次上网日期，不代表论文的发表时间）