Title: Expansive Cement Jacks

Author(s): John Timusk and Shamim Sheikh

Publication: Journal Proceedings

Volume: 74

Issue: 2

Appears on pages(s): 80-85

Keywords: expanding agents;expansion;expansive cements;jacking;portland cements; prestressing;research;self-stressing cements.

DOI: 10.14359/10990

Date: 2/1/1977

Abstract:
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.