Design of high-volume fly ash concrete for a massive foundation slab

Author:

Qiang Wang1,Peiyu Yan2,Jingjing Feng3

Affiliation:

1. Lecturer, Department of Civil Engineering, Tsinghua University, Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Beijing, P. R. China

2. Professor, Department of Civil Engineering, Tsinghua University, Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry, Beijing, P. R. China

3. Associate Professor, College of Hydraulic and Civil Engineering, Shandong Agricultural University, Tai'an, Shandong, P. R. China

Abstract

High-volume fly ash concrete was designed for a concrete foundation slab, and a mock-up of 4·5 m × 4·5m × 4·5 m was cast in order to determine the temperature variation of concrete and evaluate the cracking risk of the slab. The addition of a high amount (45%) of fly ash decreased the temperature rise of concrete significantly. The maximum temperature rise of the mock-up was only 41·3°C. Proper thermal insulation measures effectively decreased the cooling rate of the concrete mock-up. The finite-element calculation results showed that the temperature gradient on the surfaces and edges of the mock-up was bigger than its other parts, and the maximum tensile stress appeared on the edge of the upper surface. The cracking risk of concrete was very low because the tensile stress at any position of the mock-up was smaller than the tensile strength of concrete. There was no visible cracking on the upper surface of the mock-up. Decreasing the temperature rise of concrete by adding a large amount of fly ash and decreasing the cooling rate were effective ways to reduce the cracking risk of massive concrete.

Publisher

Thomas Telford Ltd.

Subject

General Materials Science,Building and Construction,Civil and Structural Engineering

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3