Aug 5, 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 …

Aug 5, 2015 · The strength of concrete that you use is regional, industry, and schedule driven. We specify 4,000 psi and receive almost 6,000 psi because contractors want to improve on …

Mar 6, 2016 · The requirement is for 3000 psi concrete. You should be able to get 3000 psi in 7 days with a 5000 psi mix. Mike, you need to watch those little keys. Or predictive text...or …

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 …

Sep 30, 2013 · Recently, I have been reading up on some of the factors to take into consideration when specifying a concrete strength, such as the inherent safety in designing for a lower …

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 …

Nov 19, 2015 · My recollection is that up until the early 1970's, in the US, concrete was generally 3,000 psi. Since that time most structural concrete has been 4,000 psi with slabs-on-grade …

Dec 21, 2016 · For 3000 psi concrete, the w/c ratio can be as high as about 0.60. 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 …

Sep 17, 2007 · i am building a house in waynesvile, nc (3700 elevation). Would there be an advantage to pouring the footers and basement floor with 5000 psi instead of 3000 psi …

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 …