Using higher concrete mix than specified as per design.
Using higher concrete mix than specified as per design.
(OP)
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 the specs that we are using are based on VicRoads Specs. Please refer to attached file
Can you please provide comments and assessments whether the scenario is acceptable considering catching up on forecast program schedules. Thanks.
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 the specs that we are using are based on VicRoads Specs. Please refer to attached file
Can you please provide comments and assessments whether the scenario is acceptable considering catching up on forecast program schedules. Thanks.





RE: Using higher concrete mix than specified as per design.
RE: Using higher concrete mix than specified as per design.
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 the long term.
Cheers.
RE: Using higher concrete mix than specified as per design.
RE: Using higher concrete mix than specified as per design.
Shrinkage will be an issue is the mix design does not consider it, but this is not purely a function is 28 day strength.