Experimental Research on the Swelling Stresses in Limestone at High Temperatures
QIN Ben-dong
CHEN Lun-jian
CHAO Jun-qi
LIU Xi-liang
Abstract：Safe engineering in rock at high temperature and maintenance problems with gasifica-tion furnaces both require an understanding of how limestone swells at high temperatures. The swelling of limestone under bidirectional constraint has been investigated by heating to high temperatures and by observations made with a scanning electron microscope. The results are that the limestone swelling stress increases as the temperature increases. After soaking at a given temperature swelling stress can reach 1.2 to 2.7 times the stress initially seen after reac-hing that temperature. Swelling and temperature are linearly related, although the slope does increase gradually as the temperature increases. Stresses are constant after sixty minutes soa-king time at a fixed temperature. There are three stages to the process: Initial heating; An in-crease in swelling stresses at the soak temperature; and, A stable period after the swelling has stopped. The swelling stress changed at the same time as the micro-structure of the rock changed.
Keywords：limestonehigh temperaturebidirectional contraintswelling stress
Publication Date：2009-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 326-330 )