Expansive Cement Jacks
John Timusk and Shamim Sheikh
Appears on pages(s):
expanding agents;expansion;expansive cements;jacking;portland cements; prestressing;research;self-stressing cements.
An attempt to use a jack which uses expansive cement to generate the jacking force is described. Comnbinations of portland cement and other raw materials were first tested for free expansion potential. Of these the cement which produced a large expansion after an adaquate delay time was selected for furthur testing where the cement was allowed to expand against predetermined uniaxially applied loads while lateral restraint was provided by the jack bodies. The tests suggest that expansive cement jacks could, under certain circumstances,provide an inexpensive alternative for the stressing of concrete structures.