Taylor kit has no mention of grinding the concrete surface prior to testing.......... so should I?
A testing company did a CC test on a slab and reported the results at 7.4
I went to the job location yesterday and noticed they did some light grinding over about a 2' square area. The dome was obviously set in the middle of that area. I have no idea what brand of testing kit they used. There was a dome residue outline left on the concrete like the square dome the Taylor kit provides. I assume different kits are all about the same.
I recall reading somewhere that you do the grinding one day, then set the test the following day to allow the concrete to "equalize" or stabilize in the area that has been ground.
I know for fact the testing company that did the test on this slab, set the dome immediately after the grinding was done. I know this because at 11am I told my contact at this job site that they must do this test......... Three hours later, I was told the tester had been contacted, he had arrived, and the test was started....... so no way was there any waiting time after grinding.
I bring this up, because I was planning to do a test myself. If my test shows nearly the same as their test, it might give me a bit more confidence if I were asked to do one.
.....so, should I grind, or not grind? Taylor makes no mention to do so......... their instructions pretty much say "set it and forget it" (for 72hrs)
The area to be tested has no sealer or curing compounds on it. The surface is not shiny nor smooth and was never troweled, because the area to receive flooring is a 13 foot by 16 foot depression created with a 2X6 and plywood form.
This slab was water cured, for probably for over a month. The slab is about 2 years old now and has been enclosed for a year or so.
Questions are:
Grind, or not to grind?
If I grind........... should I wait a day to place the test kit? That is not a problem time wise as the location is right in town. Test kit was free, and so am I, so money and time is not an issue.
A testing company did a CC test on a slab and reported the results at 7.4
I went to the job location yesterday and noticed they did some light grinding over about a 2' square area. The dome was obviously set in the middle of that area. I have no idea what brand of testing kit they used. There was a dome residue outline left on the concrete like the square dome the Taylor kit provides. I assume different kits are all about the same.
I recall reading somewhere that you do the grinding one day, then set the test the following day to allow the concrete to "equalize" or stabilize in the area that has been ground.
I know for fact the testing company that did the test on this slab, set the dome immediately after the grinding was done. I know this because at 11am I told my contact at this job site that they must do this test......... Three hours later, I was told the tester had been contacted, he had arrived, and the test was started....... so no way was there any waiting time after grinding.
I bring this up, because I was planning to do a test myself. If my test shows nearly the same as their test, it might give me a bit more confidence if I were asked to do one.
.....so, should I grind, or not grind? Taylor makes no mention to do so......... their instructions pretty much say "set it and forget it" (for 72hrs)
The area to be tested has no sealer or curing compounds on it. The surface is not shiny nor smooth and was never troweled, because the area to receive flooring is a 13 foot by 16 foot depression created with a 2X6 and plywood form.
This slab was water cured, for probably for over a month. The slab is about 2 years old now and has been enclosed for a year or so.
Questions are:
Grind, or not to grind?
If I grind........... should I wait a day to place the test kit? That is not a problem time wise as the location is right in town. Test kit was free, and so am I, so money and time is not an issue.