Characterization of high strength mortars with nano alumina at elevated temperatures

被引：135

作者：

Farzadnia, Nima ^{[1
]}

Ali, Abang Abdullah Abang ^{[1
]}

Demirboga, Ramazan ^{[1
,2
]}

机构：

[1] Univ Putra Malaysia, Fac Engn, Housing Res Ctr, Serdang 43400, Selangor, Malaysia

[2] Ataturk Univ, Fac Engn, Dept Civil Engn, TR-25240 Erzurum, Turkey

来源：

CEMENT AND CONCRETE RESEARCH | 2013年 / 54卷

关键词：

Nano alumina; Temperature; Mechanical properties; Microstructure; Mortar; MECHANICAL-PROPERTIES; CEMENT PASTE; ABRASION RESISTANCE; MULLITE FORMATION; PORE STRUCTURE; CONCRETE; PERFORMANCE; SILICA; PARTICLES; BEHAVIOR;

D O I：

10.1016/j.cemconres.2013.08.003

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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 degrees C, 200 degrees C, 300 degrees C, 400 degrees C, 600 degrees C, 800 degrees C and 1000 degrees 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. (C) 2013 Elsevier Ltd. All rights reserved.

引用

页码：43 / 54

页数：12

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