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Mike, As Ron said. There is no allowance for leakage. I have even had some CCRL inspectors pump up to initial pressure, leave meter on the bench overnight and check the next day. If you are having trouble finding the leak, i have found that if you pump it up, then submerge in water ( say a...

Ron, That's exactly what i have started doing. For short term solution, i think it's working. Any other suggestions on containers?

I have been running C1260's on some aggregates known to be innocuous and have been getting results higher than typically seen for this aggregate. We are using 20% ash mitigation, but still high. I have done some round-robin testing with other labs and found that results are all over the map...

It sounds like you may be dealing with a non-shrink grout, or may be experiencing an expansive reaction in your samples from early age to later age breaks. Inconsitencies in results or an actual decrease in strength over time could be a sign of a possible expansive reaction. If this is the...

I am familiar with the diagram you are referring to, but have never seen anyone actually use that system. If you are committed to using that system, then call ASTM and ask to be put in contact with someone on the ASTM subcommittee C-1. They will put you in touch with someone responsible for...

We did purchase the unit as a kit. I have 4, 7, and 10 ph solutions supplied with the kit. I have done a little research, but i'm still not 100% on how to proceed. The electrode is "double". I have a temperature sensor. So i know the unit will do temperature correction on it's own.

Spagetti, your absolutely right. I guess i wasn't clear enough on that point. You shouldn't use the WD-40 on the inside of the equipment. But, when applied to the exterior, it minimizes the amount of concrete that can build-up on the meters. WD-40 is o.k. on the inside of steel cylinder or...

I'm hoping someone out there can help me with chloride ion testing of concrete. My company purchased a pH meter from Gilson (HM-347) a few years ago for the purpose of conducting our own testing, but never used it. Now my boss is requiring that we start conducting our own tests rather than...