Effect of elevated temperatures on geopolymer paste, mortar and concrete

被引：667

作者：

Kong, Daniel L. Y. ^{[2
]}

Sanjayan, Jay G. ^{[1
]}

机构：

[1] Swinburne Univ Technol, Fac Engn & Ind Sci, Hawthorn, Vic 3122, Australia

[2] Monash Univ, Dept Civil Engn, Clayton, Vic 3800, Australia

来源：

CEMENT AND CONCRETE RESEARCH | 2010年 / 40卷 / 02期

基金：

澳大利亚研究理事会;

关键词：

Geopolymer; Fly ash; Temperature; Aggregates; Concrete; FLY-ASH; TRANSFORMATIONS; METAKAOLIN; STRENGTH; CEMENT; FIRE;

D O I：

10.1016/j.cemconres.2009.10.017

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Geopolymers are generally believed to provide good fire resistance due to their ceramic-like properties. Previous experimental studies on geopolymer under elevated temperatures have mainly focused on metakaolin-based geopolymers. This paper presents the results of a study on the effect of elevated temperature on geopolymer paste, mortar and concrete made using fly ash as a precursor. The geopolymer was synthesized with sodium silicate and potassium hydroxide solutions. Various experimental parameters have been examined such as specimen sizing, aggregate sizing, aggregate type and superplasticizer type. The study identifies specimen size and aggregate size as the two main factors that govern geopolymer behavior at elevated temperatures (800 degrees C). Aggregate sizes larger than 10 mm resulted in good strength performances in both ambient and elevated temperatures. Strength loss in geopolymer concrete at elevated temperatures is attributed to the thermal mismatch between the geopolymer matrix and the aggregates. (C) 2009 Elsevier Ltd. All rights reserved.

引用

页码：334 / 339

页数：6