Publication Abstract

Proceedings - Fifth International Conference & Exhibition on Piling and Deep Foundations, 1994, Bruges, Belgium, (DFI)

Improving the capacity of piles in rock through the use of expansive cement additives
C.M. Haberfield, S. Baycan & J.P. Seidel

The use of an expansive cement admixture to increase pile capacities in rock is discussed. The admixture promotes internal sulphate attack of the concrete forming the pile, which, in turn, results in the concrete expanding against the surrounding rock. If the rock is capable of withstanding this expansion, then substantial stresses normal to the concrete rock interface can be developed. The fundamental model of friction prescribes that if the stresses across the concrete/rock interface are increased, then the frictional resistance of the interfaces should also rise, thereby resulting in an increase in pile capacity. The results of laboratory investigations into the determination of the likely increases in pile capacity are described.

 article #778; publication #36 (IC-1994)