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Materials 2016, 9(8), 630; doi:10.3390/ma9080630

Fracture Properties of Polystyrene Aggregate Concrete after Exposure to High Temperatures

1
School of Architecture and Built Environment, The University of Newcastle, Callaghan NSW 2308, Australia
2
Shenzhen Durability Center for Civil Engineering, Shenzhen University, Shenzhen 518060, Guangdong, China
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 6 May 2016 / Revised: 14 July 2016 / Accepted: 25 July 2016 / Published: 28 July 2016
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [4668 KB, uploaded 1 August 2016]   |  

Abstract

This paper mainly reports an experimental investigation on the residual mechanical and fracture properties of polystyrene aggregate concrete (PAC) after exposure to high temperatures up to 800 degrees Celsius. The fracture properties namely, the critical stress intensity factor ( K I C S ), the critical crack tip opening displacement (CTODC) for the Two-Parameter Model, and the fracture energy (GF) for the Fictitious Crack Model were examined using the three-point bending notched beam test, according to the RILEM recommendations. The effects of polystyrene aggregate (PA) content and temperature levels on the fracture and mechanical properties of concrete were investigated. The results showed that the mechanical properties of PAC significantly decreased with increase in temperature level and the extent of which depended on the PA content in the mixture. However, at a very high temperature of 800 °C, all samples showed 80 percent reduction in modulus of elasticity compared to room temperature, regardless of the level of PA content. Fracture properties of control concrete (C) and PAC were influenced by temperature in a similar manner. Increasing temperature from 25 °C to 500 °C caused almost 50% reduction of the fracture energy for all samples while 30% increase in fracture energy was occurred when the temperature increased from 500 °C to 800 °C. It was found that adding more PA content in the mixture lead to a more ductile behaviour of concrete. View Full-Text
Keywords: polystyrene aggregate concrete; fracture properties; high temperature polystyrene aggregate concrete; fracture properties; high temperature
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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. (CC BY 4.0).

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Tang, W.; Cui, H.; Tahmasbi, S. Fracture Properties of Polystyrene Aggregate Concrete after Exposure to High Temperatures. Materials 2016, 9, 630.

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