Study on structural damage of mortar exposed to high temperature

Title: Study on structural damage of mortar exposed to high temperature
Author(s): M. Li, Z. Wu, C. Qian
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 959 - 966
Total Pages: 8
Nb references: 10
Language: English

Abstract: Performance of mortar gets deteriorated after high temperature. Actually deterioration of performance is due to structural damage in mortar. In order to study the structure damage of mortar exposed to high temperature, mortar with four water cement ratio respectively is investigated by macro-performance testing and micro-analysis. Carbonization resistance and water absorption of mortar exposed to high temperature are discussed. The verity of microstructure is also investigated through differential scanning calorimetry, thermogravimetric analysis and scanning electronic microscope. The results show that a series of physical chemistry reactions, such as dehydration, decomposition and crystallographic transformation, occur in mortar suffered with high temperature. The reactions make structure much loose and porosity much larger. Finally water absorption increase sharply and carbonization resistance gets worse. The carbonation depth and water absorption of mortar rise with an increase in temperature. And the growth rate of them increases when the exposed temperature is over 400°C. After being suffered with the same temperature, mortar with lower water cement ratio has much lower carbonation depth and water absorption. Mortar that possesses water cement ratio of 0.4 has the largest relative carbonation depth and the largest relative water sorption in four series of mortars.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00

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