Flexural Strength for Falsework Removal & Loading
Flexural Strength for Falsework Removal & Loading
(OP)
In the State of Ohio 650 psi flexural strength is required on beams prior to removing falsework and loading a structure. I am currently working on a bridge project where the contractor used a typical 4000 psi (compressive stength) concrete mix for pier caps and wanted to achieve the 650 psi at 3 days. The beams broke at 450-475 psi at 3 days and everyone involved was surprised not to have the 650 psi required. I thought this was not unusual and believe that 650 psi could only be achieved at 3 days if a higher performance concrete mix was used. I would like to hear anyones' ideas on the subject.





RE: Flexural Strength for Falsework Removal & Loading
To achieve high flexural strength, the aggregate sizes and ratios have to be optimized. Larger coarse aggregate will help achieve higher flexural strengths, but it isn't the only parameter to explore.
Achieving 650 psi flexural strength is not "routine" for non-pavement concrete. The values you experienced in the 450 to 500 psi range are more typical unless the mix was specifically designed for flexural strength.
RE: Flexural Strength for Falsework Removal & Loading
What were your tempertures?
RE: Flexural Strength for Falsework Removal & Loading
RE: Flexural Strength for Falsework Removal & Loading
Is the technician trained or certified to break flexaural strength specimens?
I have 30 to 40 more questions but these will do for starters...
RE: Flexural Strength for Falsework Removal & Loading
RE: Flexural Strength for Falsework Removal & Loading
RE: Flexural Strength for Falsework Removal & Loading