Contents:
Stages of Inspection of Concrete Works
Inspection of concrete is done in 3 stages,- Pre-placement
- During placement
- Post-placement.
Fig 1: Concrete Placement Inspection Checklist
1. Concrete Pre-Placement Checklist
Table 1: Standard Inspection Checklist for pre-placement of concrete.Sl. No | CHECKLIST | REQUIREMENT |
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 |
2. Inspection during Placement of Concrete
Table 2: Standard Inspection Checklist during placement of concreteSl. No | CHECKLIST | REQUIREMENT |
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 > 6m33 No’s for every 5m3 |
9 | Continuity of operations | No break in between concreting |
3. Post placement Concrete Inspection Checklist
Table 3: Standard Inspection Checklist for Post placement of concrete.Sl. No. | CHECKLIST | REQUIREMENT | ||
1 | Observation for honeycombing | Not Allowed | ||
2 | Line and 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 |
Note:
- 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.