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Advances in Materials Science and Engineering
Volume 2016 (2016), Article ID 5972570, 6 pages
http://dx.doi.org/10.1155/2016/5972570
Research Article

Experimental Research on High Temperature Resistance of Modified Lightweight Concrete after Exposure to Elevated Temperatures

1Faculty of Civil Engineering and Mechanics, Kunming University of Science and Technology, Kunming 650500, China
2Key Lab of Yunnan Higher Education Institutes for Mechanical Behavior and Microstructure Design of Advanced Materials, Kunming University of Science and Technology, Kunming 650500, China
3Faculty of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China

Received 20 February 2016; Accepted 4 May 2016

Academic Editor: Osman Gencel

Copyright © 2016 Ke-cheng He et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

In order to improve the spalling resistance of lightweight aggregate concrete at high temperature, two types of modified materials were used to modify clay ceramsite lightweight aggregates by adopting the surface coating modification method. Spalling of the concrete specimens manufactured by using the modified aggregates was observed during a temperature elevation. Mass loss and residual axial compressive strength of the modified concrete specimens after exposure to elevated temperatures were also tested. Concrete specimens consisting of ordinary clay ceramsites and crushed limestone were manufactured as references for comparison. The results showed that the ordinary lightweight concrete specimens and the crushed limestone concrete specimens were completely spalled after exposure to target temperatures above 400°C and 1000°C, respectively, whereas the modified concrete specimens remained intact at 1200°C, at which approximately 25% to 38% of the residual compressive strength was retained. The results indicated that the modified lightweight concrete specimens have exhibited superior mechanical properties and resistance to thermal spalling after exposure to elevated temperatures.