Pile Cap Sub Base Preparation

[PAeng22]

What does everyone typically specify for preparation of the sub base under a pile cap? Since the soil is not counted on for bearing support, it seems like a waste to compact it or spend alot of money improving it. There may be some cases where excavation alone will not produce a suitable surface to pour concrete on. I have seen a thin lean concrete layer specified in some cases. I would appreciate any comments or ideas.

 

[gmmolina]

I would agree with your statement. We have specified a concrete mud mat, lean concrete would probably be an equivalent description. Pretty much it would be working slab to allow for construction of the pile cap. Good luck.

Gabriel Molina, PE

 

[msquared48]

Poured all my pilecaps on native material or fill over the years with no special preparation required, other than dewatering.

Mike McCann
MMC Engineering