Aug 7, 2015 · It is said that 3000 psi concrete are more ductile than 4000 psi.. by how many percentage? do you use 3000 psi or 4000 psi in your building (ordinary and special moment …

Mar 7, 2013 · I received the concrete mix design shop drawing for a 4000 psi and report from the new structural engineer stating that the concrete section capacity is only 1% less if 4000 psi to …

Aug 13, 2002 · I'm noticing that the standard concrete design strengths are edging up, from 4000 to 4500 psi. I can remember when 3500 psi was the state of the art, then it was 4000 psi, now …

Jan 10, 2008 · I have a contractor that has repeatedly had 7-day and 28-day concrete cylinder breaks significantly lower than the specified strength. In a meeting on Friday, he presented 56 …

Jul 3, 2002 · Say a retaining wall or u-frame structure are designed using a concrete strength of 3,000 psi, but during construction a higher concrete strength, such as 4,000 psi is used. Do …

Aug 1, 2017 · For concrete not exposed to freeze thaw, chemicals, etc. you could probably rationalize 2500 psi, otherwise likely higher. I always use 3000 psi minimum, but generally …

Dec 3, 2008 · For 4000 psi concrete, the w/c ratio can be in the range of 0.50 to 0.52, depending on other aspects of the mix design. Review ACI and PCA requirements for mix designs.

Jul 13, 2006 · I am doing slope stability analysis for a levee with a I-wall on top of the levee. I need a cohesion value of concrete to perform these calculations.

May 6, 2006 · Here is the situation: Project to pave the entrance of an active truck terminal with concrete. Current spec is 8” of 4000 PSI Concrete (No flyash permitted) with #4 Bars placed …

Mar 3, 2011 · I have a situation where the design concrete mix was 4000 PSI, with 145 pcf density - pretty standard mix, with components as follows: cement 520 lbs fly ash 91 lbs water 32 gals …