Experimental study on mechanical properties of mortars at ultra low temperature

Title: Experimental study on mechanical properties of mortars at ultra low temperature
Author(s): Zhengwu Jiang, Xiongying Li
Paper category : conference
Book title: 2nd International Symposium on Service Life Design for Infrastructures
Editor(s): K. van Breugel, Guang Ye, Yong Yuan
Print-ISBN: 978-2-35158-096-7
e-ISBN: 978-2-35158-097-4
Publisher: RILEM Publications SARL
Publication year: 2010
Pages: 723 - 731
Total Pages: 9
Nb references: 9
Language: English

Abstract: Properties of cement based materials at ultra-low temperature quite differ from those at room temperature or at low temperature. In this paper, the influences of curing time at ultra-low temperature, curing time at room temperature and moisture content on mechanical properties of three types of mortars (ordinary mortar, high Strength Mortar, air entrained high Strength Mortar) at ultra-low temperature(-110) were investigated and compared with thoseat room temperature. The results show that mortar strength at ultra-low temperature greatly depends on not only curing time at ultra-low temperature, as well as other parameters of mortar such as water to cement ratio, curing time at room temperature, porosity, and moisture content and freezing degree of pore water etc. Flexural strength and compressive strength of mortar at ultra-low temperature grows rapidly with the increase of ultra-low temperature curing time at early stage and stabilizes after 3, 7 days respectively. The ratio of compressive strength to flexural strength of mortar at room temperature is higher than that at ultra-low temperature, indicating the decrease of brittleness of mortar at ultra-low temperature.
Moisture content is one of the key factors affecting mortar strength at ultra-low temperature, which improves flexural strength greater than compressive strength.

Online publication: 2011-04-20
Publication type : full_text
Public price (Euros): 0.00