Partially submerged water tank
Partially submerged water tank
(OP)
we are to construct a partially submerged water tank. during the excavation we encountered groundwater level. after grading the subsoil, we poured "lean concrete" at 2500psi @ 28days. the thickness is 2". the next day after pouring, we observed that some portion of the concrete is "rubberized". we suspected that the soil underneath was not compacted as the level of the groundwater is almost the same with the level of the subsoil. what could be the corrective measure to repair the "rubberized" concrete. by the way, we established a sumpit to collect the groundwater but maybe the level is not enough to collect all water by gravity.





RE: Partially submerged water tank
If you have only 2" the best approach would be to remove all suspect concrete and replace. You should try to keep the excavation dry when pouring the concrete and wet the concrete surface after it sets for a few days.
RE: Partially submerged water tank
RE: Partially submerged water tank
Why only 2"?.
What is the size of the tank, height? width? etc.
What sort of a job is thus? Gas station, Cheese factory???? Refinery??
A more descriptive subject label would help also.
RE: Partially submerged water tank
Not really sure why your concrete failed to set. However, if the project was properly designed with sufficient background information, you could just tell the contractor to redo failed work.
f-d
¡papá gordo ain't no madre flaca!
RE: Partially submerged water tank
actually we did what kelowna had suggested...we redug the portion of the "rubberized" subsoil under the lean concrete and compacted with adequate backfill and tried to make the subsoil dry prior to lean concreting again. and the procedure worked...
to oldest guy; i have said it earlier, we are to construct a partially submerged water tank with a mat foundation. the 2"lean concrete was supposed to act as subbase for the mat foundation since the ground level where the mat foundation will rest is at same level with the groundwater we encountered...
to fattdad; before the commencement actually of the project, we requested some groundtest data from the construction management. it was speculated in the groundtest report that there was no groundwater but prior to the excavation work we did some test pits and encountered groundwater..there was a conflict of the report and actual condition of the soil [maybe the borehole(s) were not representative of the soil condition of the site]..
anyways, it was great communicating with you guys...