Physicochemical change of cement pastes at elevated temperatures

Title: Physicochemical change of cement pastes at elevated temperatures
Author(s): Xian Liu, Guang Ye, Geert De Schutter, Yong Yuan, Luc Taerwe
Paper category : conference
Book title: 2nd International RILEM Symposium on Advances in Concrete through Science and Engineering
Editor(s): J. Marchand, B. Bissonnette, R. Gagné, M. Jolin and F. Paradis
Print-ISBN: 2-35158-003-6
e-ISBN: 2351580028
Publisher: RILEM Publications SARL
Publication year: 2006
Nb references: 10
Language: English

Abstract: Explosive spalling of high performance concrete and self-compacting concrete can occur due to a series of physicalchemical reactions when the concrete is exposed to elevated temperatures. At elevated temperatures, due to the difference in materials used in the mixtures, the physical and chemical properties of these concretes should be different compared to normal high performance concrete.
The aim of this study is to analyze the physicochemical change of cement pastes at elevated temperatures. Two different cement pastes, corresponding to high-performance concrete and self-compacting concrete, were selected for the experimental programme. During the experiments, differential thermal and thermogravimetric analysis (DTA and TGA) were used to determine the physical and chemical change with increasing temperature at 28 days. After exposure to high temperatures, scanning electron microscopy (SEM) with image analysis was also applied to observe the phase changes. Mercury intrusion porosimetry (MIP) was applied to determine the pore structure of the samples after heating.
Some conclusions about the physicochemical change of cementitious materials explored to high temperature and its relation with the development of pore structure were obtained. The results of this study will provide information for the numerical simulation of the spalling behavior of self-compacting concrete exposed to high temperatures.

Keywords: Physicochemical change, Pore structure, Elevated temperatures, Cement paste

Online publication: 2006-08-02
Classification: 3.1 Theme 1: Numerical Models: from Microstructure to Transport Properties and Durability
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2351580028.032