Calcium Carbide testing and Silicates

[Lepito]

Hi J.D. Yes it Bill.
Been a while since my last post.
I'm sure about 75 % and 5 LB as i have the data sheet in my hand for Mapei Ultrabond G21.

The project eaadams is referring was in Bakersfield Ca in an elementary school. Were you on that job ?

On today's project No sand blotter layer, good quality vapor retarder in direct contact with the concrete.
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The question is :
Does silicate contamination render the test VOID when the test sample is treated with a silicate?

i can not find any reference to this question on the web.