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Sulfur capping compound

Sulfur capping compound

Sulfur capping compound

(OP)
ASTM requires a new test be run for labs testing high-strength concrete in accordance with C617 that shows that 15 cylinders capped with sulfur exhibit strength within 2% of strength of 15 ground cylinders.  In lieu of running these tests, the lab may choose to use the manufacturer's test data.  However, I have not found a mfg yet that has run this test.  Nor have any labs in my area.  And my initial test came up 5% short of the ground cylinders.  
Now, I am aware that capping with sulfur 7 days prior to testing should increase the strength.  But other than that, does anyone have any guidance or knowledge of this testing being run?

RE: Sulfur capping compound

vol,
could you expand. I'm 1-yr out of the testing business. we would test the sulfer cmpd after casting it in steel mortar cubes.  i think if it exceeded 8ksi in the 2" cube shape it was good.  Is that no longer the case. 2% seems too tight. Were you getting 2% variance b/n just the cylinders that were ground?
-ham

RE: Sulfur capping compound

(OP)
The 2-inch cube testing is not valid for high strength concrete testing.  It is a 2% difference from the average and then within a certain standard deviation.  Yuch!  Of course the data points from the ground cylinders are not within 2% of each other.  It is an excellent point and I will run some statistics to see what the range really is.  BUT I am still wondering if anyone has done this in their lab...

RE: Sulfur capping compound

Vol,
I'm glad i got out. it sounds like there will be a lot of cooking going down in the CCRL QC books this year. :)
good luck,

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