Dewatering of area to be concreted shall be carried out if required. Also area shall be cleaned of any dirt, debris, waste material, binding wires etc.
Step 3 – Pre Concreting Checks
1) Necessary latest drawings shall be made available on site.
2) Checking of form work, supports and scaffolding shall be done as per the available latest drawings.
3) Checking of various activities such as reinforcement, cover blocks, embedded electrical conduits, plumbing lines, inserts etc. shall be done as per drawing.
4) Sequence of concreting and location of stopper shall be decided and clearly marked on drawings available on site.
5) Moisture correction for sand shall be calculated and net quantity of water to be added per bag of cement shall be decided to maintain water cement ratio as per mix design.
6) Wetting of coarse aggregates shall be carried out 24 hours before actual concreting in case of site produced concrete.
7) Availability of necessary raw materials and equipments shall be ensured.
8) Appropriate deshuttering agent should be applied on formwork.
9) Checklist / QA card should be appropriately filled taking into account all the points are maintained properly at site.
10) In case of site produced concrete, concreting shall be preferably done on weight basis. However if volume batching has to be resorted to, conversion into volume shall be done by calculating DLBD of coarse / fine aggregates and also taking into account Bulkage Factor for sand.
11) Pharmas of correct sizes shall be prepared and maintained in proper condition in such cases.
12) Sufficient concrete handling, compaction (vibrators) and curing arrangements with respect to size of the pour, depth of pour, spacing of reinforcement etc. must be ensured before starting concrete if site produced concrete or before ordering concrete from approved supplier.
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