Ageing coefficient for early age tensile creep of blended slag and low calcium fly ash geopolymer concrete

被引：34

作者：

Cheng, ZhengQing ^{[1
]}

Zhao, Renda ^{[1
]}

Yuan, Yuan ^{[1
]}

Li, Fuhai ^{[1
]}

Castel, Arnaud ^{[3
]}

Xu, Tengfei ^{[1
,2
]}

机构：

[1] Southwest Jiaotong Univ, Sch Civil Engn, Dept Bridge Engn, Chengdu 610031, Peoples R China

[2] Southwest Jiaotong Univ, Key Lab High Speed Railway Engn, Minist Educ, Chengdu 610031, Peoples R China

[3] Univ Technol Sydney, Sch Civil & Environm Engn, Sydney, NSW 2007, Australia

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2020年 / 262卷

关键词：

Geopolymer concrete; Early-age; Tensile creep; Shrinkage; Cracking age; SHRINKAGE CRACKING; MECHANICAL-PROPERTIES; DRYING SHRINKAGE; BASIC CREEP; STRENGTH; BEAMS; BEHAVIOR; SILICA; PERFORMANCE; CEMENT;

D O I：

10.1016/j.conbuildmat.2020.119855

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The ageing coefficient is required in the age-adjusted effective modulus method to assess the effect of creep in concrete structures subjected to varied stress history. In this paper, experiments were carried out to calibrate the ageing coefficient for early age tensile creep of blended slag and low calcium fly ash geopolymer concrete. The development of total strains of geopolymer concrete under sustained tension, including instantaneous strain, creep strain and shrinkage strain was monitored by using the dog-bone shaped specimens. The specimens were loaded at the age of 2, 3, 4, 7, 14, 21 days, respectively. The strains of the unloaded companion specimens were monitored as well. The development of the creep coefficient phi(t, tau(0)) for geopolymer concrete was calculated based on the experimental results. By using the step-by-step numerical analysis, the ageing coefficient for early age tensile creep of geopolymer concrete was assessed. An ageing coefficient of 0.8 is recommended for structural design. The comparison between calculated and measured tensile strains from the restrained concrete ring test shows the validity of the proposed value of the ageing coefficient. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：11

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