Following are the 12 points, that should be checked for the PCC work in the foundation.
1. Strata:
After the footing excavation, you should check for the SBC of soil or strata for the laying of the foundation PCC. If there are deep pockets in the strata, they should be filled with plum concrete before doing PCC.
For the residential buildings having low bearing capacity soil, boulder soling is preferred for the stabilization of the foundation.
2. Layout:
The centerline of the column is marked & the excavated pit is checked for its correct position. The outline of the foundation is checked to mark the boundary of PCC.
If the excavation is done by the JCB, the size of the pit may be inaccurate. In that case, you have to fix the formwork box for the casting of PCC work.
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3. Cleaning:
All unwanted materials like formwork pieces, loose soils, organic debris, etc. should be removed from the footing pit.
4. Level:
The top level of the PCC is marked at the 4 corners of the foundation pit. The depth of the PCC is considered from the highest level point of the uneven strata.
For eg., if the PCC depth is 100mm., the top level of PCC is marked at 100mm. above the upper portion of the strata.
5. Dewatering:
If there is any seepage of water at the footing pit, a sump is created at the lowest corner of the strata for dewatering.
While pouring the concrete, it should be checked that the water should not rise above the strata level. The dewatering process is continued until the PCC gains its initial setting time.
6. Sprinkling:
If the strata of the excavated pit are dry without any moisture content, you have to sprinkle water before concreting. Otherwise, the strata or soil base absorbs water from the poured PCC, making it weak and having low strength.
7. Concrete mix:
The grade of the PCC is checked for its proportion to achieve the required consistency. The W/C ratio is maintained to prevent the segregation & bleeding of the concrete.
8. Pouring:
If the pouring depth is above 1.5m., a chute arrangement is made to prevent the segregation of concrete. Or a person should be appointed at the pit, to receive the ghamela for the casting work.
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👀. What is the Segregation of concrete? - Causes, remedies, and different types.
9. Compacting:
You can use wooden rammers or logs to compact the PCC. Starting from one end, take care to compact all the poured PCC without any voids.
10. Thickness:
After pouring & compacting the concrete, the top level of the PCC is checked for its required depth, and leveling is done.
11. Top surface:
The top surface is finished by using a leveling metal Patti & lineout string. The uniform top-level is checked diagonally by holding the string at the PCC corners.
12. Curing:
On the next day, the curing process is started to gain the required strength.
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