1) Honeycombing, especially severe honeycombing shall not be patched up without showing the conditions to
the QA Engineer who would decide the remedy.
Learn construction from The Foreman himself.
Inspection of concrete after removal of formwork and Corrective Measures
1) On removal of formwork, the surface shall be examined by Engineer. The inspection shall
Hot / Cold Weather Concreting Requirements
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| liquid nitrogen concreting |
1) In hot weather, (temperature of surrounding higher than 40 C) concrete shall be transported in deep containers to reduce the loss of water due to evaporation
Steps for Casting and testing of Cubes
For the assessment of compliance of ready-mixed concrete or site mixed concrete, the point and time of sampling shall be at discharge from the producer’s de
Vital steps for Concrete cube sampling
For Site Mixed Concrete:
The minimum frequency of cube casting shall be as follows
The minimum frequency of cube casting shall be as follows
After concreting checks
1) All the flat portions of footings / underground structures shall be applied an epoxy based bituminous layer for protection against ground water.
Curing of shearwall , columns, slabs
Columns / Shear walls
1) Curing shall be done keeping the concrete surface wet by covering it with moist double Hessian cloth 2) Curing shall continue for at least 10 days.
Slabs
1) Curing of slabs shall be done as mentioned above.
2) Ponds shall be made within 24 hours of slab casting and till then slab shall be cured by spraying water.
3) Ponds shall be made at column locations first to cover from all sides and then to cover other portions of slab.
4) Care shall be taken to see to it that ponds are completely filled with water through out the recommended period for curing.
5) Vertical faces of the beams and area of slab out side ponds shall be cured by covering with wet Hessian cloth.
6) Incase where ponding is not done, whole slab should be covered with wet hessian cloth and care should be taken to keep it moist always.
1) Curing shall be done keeping the concrete surface wet by covering it with moist double Hessian cloth 2) Curing shall continue for at least 10 days.
Slabs
1) Curing of slabs shall be done as mentioned above.
2) Ponds shall be made within 24 hours of slab casting and till then slab shall be cured by spraying water.
3) Ponds shall be made at column locations first to cover from all sides and then to cover other portions of slab.
4) Care shall be taken to see to it that ponds are completely filled with water through out the recommended period for curing.
5) Vertical faces of the beams and area of slab out side ponds shall be cured by covering with wet Hessian cloth.
6) Incase where ponding is not done, whole slab should be covered with wet hessian cloth and care should be taken to keep it moist always.
Footings
1) Flat portion of footings shall be cured by covering it with wet double Hessian cloth.
2) For flat portions of Rafts, curing shall be done in a similar way as that for slab and vertical faces shall be cured similar to the columns.
1) Flat portion of footings shall be cured by covering it with wet double Hessian cloth.
2) For flat portions of Rafts, curing shall be done in a similar way as that for slab and vertical faces shall be cured similar to the columns.
How to protect fresh concrete
Protection of concrete
1) Newly placed concrete shall be protected from rain, sun and wind by approved means viz: Hessian cloth, plastic sheets etc.
2) Concrete placed below the ground level shall be protected against contamination from falling earth, during placing.
3) The area in and around the actual place of the concreting shall be kept sufficiently dry, by constructing sufficiently watertight forms / cofferdam around the area to be concreted, to prevent loss of mortar through walls.
4) Continuously dewatering the area through out the period of concreting and till initial set of concrete occurs with the help of dewatering pumps shall not be resorted to.
1) Newly placed concrete shall be protected from rain, sun and wind by approved means viz: Hessian cloth, plastic sheets etc.
2) Concrete placed below the ground level shall be protected against contamination from falling earth, during placing.
3) The area in and around the actual place of the concreting shall be kept sufficiently dry, by constructing sufficiently watertight forms / cofferdam around the area to be concreted, to prevent loss of mortar through walls.
4) Continuously dewatering the area through out the period of concreting and till initial set of concrete occurs with the help of dewatering pumps shall not be resorted to.
How to achieve concrete strength by curing
Curing
1) Curing is the process of preventing the loss of moisture from the concrete whilst maintaining a satisfactory
temperature regime. For all concrete works, curing shall be start
Checks for concreting sub- structures (columns shear walls slabs beams footings)
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| types |
Footings
1) PCC should be done in level as per given size in drawing with Dobra marking.
RCC - Ready Mix concrete checks
Ready Mix Concrete:
2) Before unloading of any truck at the site, the
RCC - How to make concrete at Site
I. Site Mixed Concrete:
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| site mixer |
1) Weights of aggregates shall be adjusted in the first 5 batches to get required slump, without changing the
water cement ratio given in the
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