HOW TO INSPECT CONCRETE CONSTRUCTION WORK ON SITE?

The following procedures have been found to increase the likelihood of meeting the intended design and specifications on a large variety of projects. This results in a complete facility that will ensure exactly the purpose for which it is intended, at minimal maintenance cost.

  1. The purpose of inspection is to ensure that good practices are followed in design and construction of the project as per specifications and not to establish these practices. Any necessary changes to plans or specifications should be brought to the attention of the architect or engineer so that the designer has an opportunity to make a final decision, in so far as the changes affect his design. Inspection does not absolve the contractor of the responsibility of performing the work properly in accordance with the documents of the contract. Inspection personnel should cooperate with the contractor, but should avoid running the work for the contractor, as this is not part of the inspection work and may result in unsolicited claims in case of trouble later.
  2. Since inspection in this recommended practice is the ultimate responsibility of the architect or engineer, he should insist that the owner authorize him to go along with this responsibility. He should then plan the inspection commensurate with the character, magnitude and importance of the work and advise the owner of the estimated cost required to properly execute the inspection.
  3. Proper inspection provides for continuous inspection during the placing and finishing of concrete, and includes the preparation before the start of concreting such as proper formwork, placing or reinforcing, etc., as well as proper protection and curing of the finished concrete. On larger projects, or where particular concrete with strength, density or texture is desired, continuous oversight of batching and mixing operations should be provided.
  4. The architect or engineer must see that qualified and dedicated inspectors are on the job, as this is critical to effective inspection. Where such inspectors are not available or where there are special requirements in design and specifications, such inspectors should be trained to qualify.
  5. A meeting between the architect or engineer, the contractor and the inspection personnel is essential just before construction begins. In such a meeting questions can be answered and procedures can be reviewed so that everyone knows ahead of time what is expected and how it is to be done. This advance understanding will underpin future arguments, and will give the inspector the status and knowledge of the support he can expect as well as trust that he will receive it.
  6. The following makes a partial list of inspection tasks that may be covered:
  • Inspection and approval of batching and mixing facilities
  • Control of proportions of concrete mixes
  • Material inspection, testing and approval
  • Inspection of forms, reinforcing steel, shoring, bracing, embedded items, joints, etc.
  • Inspection of concrete handling, placing equipment, such as buckets, chutes, hoppers, vibrators, pumps, etc.
  • Inspection of concrete handling, placing, consolidation, finishing, curing, protection and patching repairs
  • Inspection in plant of prefabricated goods including prestige work for strength, dimensions and special properties
  • Stripping, Form Removal and Inspection of Shoring
  • Preparation and testing of concrete strength samples
  • Daily report on all these items
  1. The number of inspectors to carry out such a program will vary from job to job depending on the size, importance, set-up of the contractor etc. and should be planned by the architect or engineer for each individual case.
  2. Unless otherwise provided in the specifications, concrete inspected in accordance with the provisions of this Recommended Practice shall have the average of all sets of three consecutive strength test results or exceed the required strength and any individual strength test results required The power should not be exceeded. Over 500 psi (according to ACI 318-71).

Er. Mukesh Kumar

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Er. Mukesh Kumar is Editor in Chief and Co-Funder at ProCivilEngineer.com Civil Engineering Website. Mukesh Kumar is a Bachelor in Civil Engineering From MIT. He has work experience in Highway Construction, Bridge Construction, Railway Steel Girder work, Under box culvert construction, Retaining wall construction. He was a lecturer in a Engineering college for more than 6 years.