October Rapid RH Newsletter -Just the facts Ma'am

The Business Case for Calibration

When testing moisture content (MC) in concrete, any type of meter or probe must be calibrated to ensure accuracy. Moisture meters for concrete test surface ranges only but can be useful for placing in situ probes for in-depth relative humidity (RH) testing. In-Situ is a Latin phrase meaning, in position. In-situ probes are placed "inside" concrete slabs in order to accurately measure RH. Ideal - except that any moisture meter or in situ probe needs to be calibrated before beginning such assessments. Proper calibration is crucial to accurate RH testing, MC readings, and, logically, successful finished flooring installations...

 

We're going to Vegas for the Surfaces and World of Concrete 2013 show and we'd like you to join us! In fact, we'll even send you a discount on registration. Be sure to watch for our email to hit your inbox first part of November.

We are doing a project right now where the old warehouse was found to lack a retarder under the slab. RH came in at 99%. It is being VAP'd this week. What is interesting is when I discussed with my VAP rep, he kept talking about moisture vapor pressure. Can anyone point me to anything linking RH & Vapor? I guess where I am a little confused is how does RH predict Vapor / Osmotic Action? 

 

It is one thing to use a water soluble adhesive that will dissolve under PH & Moisture over time if in contact with concrete water (for lack of a better word) but it is another thing to have that wicking action acting as a force from bellow. The two can result in more blisters (a light version of what you see with ASR). Anyone have a perspective on this?