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Thanks hokie66 for the comments. One of our engineer's concern is that the increased cement content in the 50MPa mix will increase the risk of early thermal cracking in the massive pier due to higher heat of hydration during concrete setting and also due to higher shrinkage which will occur in...

What is the consequence of using higher concrete mix design than specified as per design. Say 50MPa of concrete mix was used instead of 40MPa on bridge overpass crosshead. Engineer's intention is to removed the forms at an earlier days as specified. I am working in Melbourne, Australia where...

Gents, I also agree that adding water to the mix at site is not really acceptable. However, Is it possible between concrete supplier and the QC personell in charge to the mix to have an arrangement for some allowances to put extra water or plasticer to site due site condition and or type of...

Apologies for not detailing the situation on my previous information provided. All project specs. captures all the requirements for all concreting work specifically concrete testing is concerned. Approved mix design slump is 110mm. +/- 15 mm tolerance. During concrete pouring on the wall of a...

We also encountered same issue adding super plasticizer to the approved mix at site (Melbourne, Australia). When slump test conducted there was an increase in slump thus, exceeding the permissible tolerance on slump on Australian Standard 1379. Concrete strength results achieved the project...