When and why would one use ASTM D4253 or D4254 for determining density? The specification I’m looking at lists these along with the ASTM D698 and I’m unfamiliar with 4253&4254. The required percent compaction is significantly reduced when testing based on 4253&4254 (i.e. 95 down to 70% for...
Thank you for the information. I'm having to drag them kicking and screaming ("heck we're been doing it this way for 20 years, why do we need to change?") to the right path.
I laid it out plainly and told them that if we did not conduct our testing per the specs then our results were not...
We are having a office debate on what the "best" way is to get the ends of our cylinders in tolerance before conducting compression testing. We handle roughly 400 cylinders per year. Currently they either do nothing or use a hand grinder. I would like to drag them to the right way.
I'm trying to...
My air meter was calibrated at roughly 4000 feet of elevation and it is not uncommon for us to be testing concrete 1000 or 2000 feet higher. I have noticed discrepancies when testing air content at these higher altitudes. On the face of it, it does seam that there could be an affect. The...
