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Characterization of high strength mortars with nano alumina at elevated temperatures

Abang Ali, Abang Abdullah and Demirboga, Ramazan and Farzadnia, Nima (2013) Characterization of high strength mortars with nano alumina at elevated temperatures. Cement and Concrete Research, 54 (2013). pp. 43-54. ISSN 0008-8846

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Abstract

In this study, the effect of elevated temperatures on chemical composition, microstructure and mechanical properties of high strength mortars with nano alumina was investigated. Mortars with 1, 2 and 3% nano alumina as cement replacement were prepared and then exposed to 100 °C, 200 °C, 300 °C, 400 °C, 600 °C, 800 °C and 1000 °C. XRD, DSC and SEM tests were carried out to identify chemical composition and microstructure changes in the cement matrix after being exposed to elevated temperatures. Residual compressive strength, relative elastic modulus and gas permeability coefficient of samples were also obtained. A brittleness index was defined to monitor changes in brittleness of samples after being exposed to elevated temperatures. Nano alumina enhanced compressive strength of samples up to 16% and improved residual compressive strength. An increase in the relative elastic modulus, higher energy absorption and lower permeability were also observed when 1% nano alumina was added.

Item Type:Article
Keyword:Nano Alumina, temperature, mechanical properties, microstructure, mortar
Faculty or Institute:Faculty of Engineering
DOI Number:10.1016/j.cemconres.2013.08.003
Altmetrics:http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.1016/j.cemconres.2013.08.003
ID Code:28582
Deposited By: Muizzudin Kaspol
Deposited On:03 Jun 2014 13:22
Last Modified:08 Sep 2015 15:11

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