An Over Review of Post-Grouted Piles

Post-grouting of piles after construction becomes popular because it effectively increases axial capacity under serviceable displacements. Lately, pile construction has been utilized for several well-established deep foundation installation techniques. Piles are built with a method suitable for soil conditions, and once the concrete gets hardened, grout is injected under pressure under the pile tip. Base-grouted piles have been used successfully all over the world as they could increase axial pile capacity resulting from high tip resistance at relatively low displacements. Geotechnical specialists debate when to use post-grouting of a pile base because grouting the pile tip will cause an extra cost of pile construction. For consideration of post-grouting, the designer should estimate the load-displacement performance of both grouted and un-grouted piles to assess post-grouting as a feasible alternative. This paper summarizes the state of practice for post-grouting piles, assesses the effectiveness degree of various improvement mechanisms, and presents suggestions derived from this research.