Mechanical behaviour at high temperature of alkali-activated aluminosilicates (geopolymers)

Martin Sanz, Antonia and Pastor Caño, Jose Ignacio and Palomo, Ángel and Fernández Jiménez, A. (2015). Mechanical behaviour at high temperature of alkali-activated aluminosilicates (geopolymers). "Construction and Building Materials" (n. 93); pp. 1188-1196. ISSN 0950-0618. https://doi.org/10.1016/j.conbuildmat.2015.04.044.

Description

Title: Mechanical behaviour at high temperature of alkali-activated aluminosilicates (geopolymers)
Author/s:
  • Martin Sanz, Antonia
  • Pastor Caño, Jose Ignacio
  • Palomo, Ángel
  • Fernández Jiménez, A.
Item Type: Article
Título de Revista/Publicación: Construction and Building Materials
Date: 18 March 2015
ISSN: 0950-0618
Subjects:
Freetext Keywords: Geopolymer, mechanical behavior, high temperature, alkali-activated aluminosilicates, cement
Faculty: E.T.S.I. Caminos, Canales y Puertos (UPM)
Department: Ingeniería Civil: Construcción
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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 compres-sive strength after a 1-h exposure to high temperatures and subsequent cooling. The findings showed that from 25 to 600 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 tem-peratures of over 600 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.

Funding Projects

TypeCodeAcronymLeaderTitle
Government of SpainMAT2012-38541-C02-02UnspecifiedUnspecifiedUnspecified
Government of SpainBIA2013-43293-RUnspecifiedUnspecifiedUnspecified
Madrid Regional GovernmentS2013/MIT-2862MULTIMAT-CHALLENGEUnspecifiedUnspecified

More information

Item ID: 40721
DC Identifier: http://oa.upm.es/40721/
OAI Identifier: oai:oa.upm.es:40721
DOI: 10.1016/j.conbuildmat.2015.04.044
Official URL: http://www.sciencedirect.com/science/article/pii/S0950061815004870
Deposited by: Memoria Investigacion
Deposited on: 22 Jul 2016 13:54
Last Modified: 01 Sep 2016 13:35
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