期刊
CONSTRUCTION AND BUILDING MATERIALS
卷 93, 期 -, 页码 1188-1196出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2015.04.044
关键词
Geopolymer; Mechanical behaviour; High temperature; Alkali-activated aluminosilicates; Cement
资金
- Spanish Ministry of the Economy and Competitive Affairs [MAT2012-38541-C02-02, BIA2013-43293-R]
- Comunidad de Madrid (MULTIMAT-CHALLENGE) [S2013/MIT-2862]
This study was designed to determine the effect of temperature on the mechanical strength (in both in vivo and post-exposure trials) of two alkaline cements (without OPC): (a) 100% fly ash (FA) and (b) 85% FA + 15% bauxite, the activated alkaline solution used was 85% 10-M NaOH + 15% sodium silicate. A Type I 42.5 R Portland cement was used as a control. Two series of trials were conducted: (i) in vivo trials in which bending and compressive strength, fracture toughness and modulus of elasticity were determined at different temperatures; and (ii) post-firing trials, assessing residual bending and compressive strength after a 1-h exposure to high temperatures and subsequent cooling. The findings showed that from 25 to 600 degrees C, irrespective of the type of test (in vivo or post-firing), compressive mechanical strength rose, with the specimens exhibiting elastic behaviour and consequently brittle failure. At temperatures of over 600 degrees C, behaviour differed depending on the type of test: (i) in the in vivo trials the high temperature induced pseudo-plastic strain and a decline in mechanical strength that did not necessarily entail specimen failure; (ii) in the post-firing trials, compressive strength rose. (C) 2015 Elsevier Ltd. All rights reserved.
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