Is there clear guidelines to reduce item rates, if the Contractor does not comply with the minimum curing period of Reinforced Cement Concrete works?

Thanks Mr.Thomas for invitation, totally agreed with Mr. Foaud's answer and no additions.

Thank you Mr.Thomas.

There is no answer after my teachers Eng. Fouad and Eng. Jafar Zain so, i support their answers both.

Thank you Mr. THOMAS ,,, General Conditions for Construction civil engineering works and clear and may vary in some facets of the country to another, but they all agree on the implementation of the paragraphs of the work of the project under the terms and conditions of this in general, but this question is the subject in that the contractor has failed to implement the effectiveness of the work, it depends on the evaluation of the extent of damage to the element structural depends Rated the resident Engineer and has the right to take any action to ensure the safety of implementation under the specifications and in the case is not affected by concrete, this failure was caused by the Contractor is entitled by law and under the contract formula  to refuse the work or accepted it with deduct the price he sees fit to this paragraph work

I agree with Mr. Thomas, Mr. Fouad  and Al Qalimey.

I think it should be strongly monitored by supervision engineer where contractor is doing curing of concrete or not. It must be done by contractor if not client will do this job for that part of structure and then contract should not be continues with that contractor further due to breach of contract.

There are no such guidelines to reduce the rate for bad quality items, it depends on the Consultant and Quality of work.

In concrete, if contractor does not comply with minimum curing of RCC, the consultant has to force contractor to perform additional test to check the compressive strength of concrete. e.g. Ultrasonic Pulse Velocity Method  core cutter test, rebound hammer test,Transducer Arrangement etc.

If the tests after days fail to the required compressive strength, then concrete should be demolished to avoid serious accident in future. Quality can be compromised to certain limit but not over the lives of people.

If concrete subjected to insufficient curing Process , Hydration process rate is increasing so that result Micro cracks Possible in IT zone at the same time Shrikage odf concreting and surface crack will occure

The Engineer is not allawed to reduce/revise the item rate of the contract. Engineer can reject the work if it was not complied as per the Contract requirements.

The discussion is about the rate item, vs implementation of conditions of contracts.  Therefore, if the contractor is not complying , even he has been warned of doing good, then there is no option of alllowing him to work on the concrete element further, because curing is the primary activity for strength achieving. otherwise it will be blame of the engineering rather than a Civil Engineer.

You cannot assume that the clear guidelines you speak of are known to everyone unless mentioned in the specifications. Even if so, there is the phrase 'good engineering practises'. You can first issue a letter with copies to everyone concerned mentioning clearly what is being done wrong and with reference to what specification. This will force everyone concerned to act. (You can always ask the contractor for a cube which will be cured as it has been done by him and subject the same to tensile testing.) It will be wise to do this as early as possible. After all, you don't want anyone to incurr a heavy loss.

This is only applicable if it is stated on the agreement between the two the owner and the contractor. But if it's not stated on the agreement, then the engineer that has the authority or the one that who supervise with the construction should have to do the implementation or take action so that the breach of contract will not be affected.