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Quality control of concrete starts with inspection of concrete during pre-placement, during placement and post-placement. Type of inspection of concrete depends on type of concrete, i.e. PCC or RCC, type of elements to be casted, such as RCC slab, columns, footing, beams, walls etc. Although it is easy to remember number of checks during inspection of concrete member, a checklist is always required for record of the placement of concrete and quality control measures taken at site. It is both beneficial to contractor as well as engineer to maintain the record of checks, so that they can produce it in case of any discrepancy. It also allows becomes a proof of quantity of concrete work done by the contractor, so that no discrepancy arises during billing. The checklist also notes the number of cubes taken for the given work and its id is noted in the checklist, so that when cube test results arrive, it becomes easy to identify the structural elements for the given cube test results.

Concrete Placement Inspection Checklist

Following is a sample concrete placement checklist for RCC and PCC works which must be followed every time when concreting work has to be done. All the empty space has to be filled and remarks if any shall be written in remarks column. Date of inspection of pre-concrete, during placement and post-concrete placement shall be noted as these steps may not be performed on the same day. Signature by contractor supervisor and engineer is done after each inspection.

CONCRETE PREPLACEMENT CHECKLIST

Sl. No

CHECKLIST

REQQUIREMENT

1

Centre line

As per drawing

2

Formwork & Staging

As per drawing & in exact plum

3

Construction joint location*

As per drawing

4

Steel reinforcement diameter / spacing & coating*

As per drawing

5

Cover to the reinforcement and overlap*

As per drawing

6

Shuttering

Aligned as per drawing and in plumb

7

RLs and reference levels

As per drawing

8

Embedment part check, i.e. insert plates, nipple etc

As per drawing

9

Placement of water stoppers, if any*

10

Location of construction joint

11

Water tightness of shuttering, if required

No water seepage allowed

12

Quality of water

Potable and clean

13

Measuring jar for water pouring

As per water content requirement

14

Quality of materials

As per specification

 

INSPECTION DURING PLACEMENT OF CONCRETE

Sl. No

CHECKLIST

REQQUIREMENT

1

Water cement ratio

As per specification

2

Surface preparation by mortar bedding

Fresh mortar

3

Slump testing*

As per requirement

4

Adequacy of vibration

40mm and 60mm needle required

5

Segregation of aggregates

Not allowed

6

Removal of temporary spacers and ties*

To be removed

7

Check for shuttering prop displacement / settlement

Not Allowed

8

Number of cubes taken for testing with identification

No.: ________    Id: __________

3 No’s for RCC > 6m3

3 No’s for every 5m3

9

Continuity of operations

No break in between concreting

 

POST PLACEMENT INPSECTION OF CONCRETE

Sl. No.

CHECKLIST

REQUIREMENT

1

Observation for honeycombing

Not Allowed

2

Line & Level

As per drawing

3

Surface finish

As per drawing

4

Cracks and air bubbles

Not Allowed

5

Method of curing

As specified

6

Checked for stripping/Removing of formwork support etc. after specified duration of stripping time.

Yes

No

NA

7

Checked for position of embedment

Yes

No

NA

8

Repair and finish all surface defects by specification / approved method

Yes

No

NA

9

Surface of part of structure is alright and allowed for subsequent activity / backfilling

Yes

No

NA

10

Others, if any

 * Only in case of RCC and not PCC

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