Performance of geopolymer concrete composed of fly ash after exposure to elevated temperatures

被引：93

作者：

Valencia Saavedra, William Gustavo ^{[1
]}

Mejia de Gutierrez, Ruby ^{[1
]}

机构：

[1] Univ Valle, Sch Mat Engn, Composites Mat Grp CENM, Calle 13 100-00,Bldg 349,Second Floor, Cali, Colombia

来源：

CONSTRUCTION AND BUILDING MATERIALS | 2017年 / 154卷

关键词：

Fly ash; Granulated blast furnace slag; Concrete; Alkali-activated concrete; Thermal behaviour; THERMAL-BEHAVIOR; ALKALI;

D O I：

10.1016/j.conbuildmat.2017.07.208

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

Alkaline activated concretes based on a mixture of fly ash (FA) and blast furnace slag (GBFS), as well as FA and Portland cement (OPC), both at a ratio of 80:20, were exposed to temperatures between 25 degrees C and 1100 degrees C. Then, the physicochemical and mechanical changes were evaluated. The results indicate that the activated concretes have better performance than the reference ones (100% OPC). At temperatures of 1100 degrees C, the residual strengths of the FA/GBFS and FA/OPC concretes are 15 and 5.5 MPa, respectively, unlike the OPC concrete that lost 100% of its strength. At temperatures above 900 degrees C, the activated matrix densified, and the crystalline phases, such as sodalite, nepheline, albite and akermanite, are identified. (C) 2017 Elsevier Ltd. All rights reserved.

引用

页码：229 / 235

页数：7

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