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RH Test Hole Callout
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09-26-2008, 09:40 AM #1
Ben Newbie *
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I'm following the spec to put a test hole in the slab every 1000 sq ft after putting 3 test holes in the first 1000 sq ft. What is the rational for the 1000 sq ft callout?

09-26-2008, 01:58 PM #2
rthompson Industry Expert *****
Status: Offline Posts:72 Threads:0 Joined:Sep 2008
(09-26-2008, 09:40 AM)Ben Wrote:  I'm following the spec to put a test hole in the slab every 1000 sq ft after putting 3 test holes in the first 1000 sq ft. What is the rational for the 1000 sq ft callout?

For the CaCl2 testing it is to establish a base line. I do not know why for the RH probes because they are calbrated and supposed to be maintained that way.
Rayt

10-27-2008, 08:21 AM #3
CMoore Newbie *
Status: Offline Posts:6 Threads:1 Joined:Sep 2008
Ben,
I talked with someone that had this explained to him by a member of the ASTM committee in this way… three test holes in the first 1000 sq. ft. to better insure you’re getting a good RH reading in case one probe is on a piece of aggregate and won’t read correctly. A test hole in each additional 1000 sq. ft. is based on the amount a truckload typically carries to pour. This would help identify those mixes that vary with water to cement ratios.

11-04-2008, 10:03 AM #4
rthompson Industry Expert *****
Status: Offline Posts:72 Threads:0 Joined:Sep 2008
(09-26-2008, 09:40 AM)Ben Wrote:  I'm following the spec to put a test hole in the slab every 1000 sq ft after putting 3 test holes in the first 1000 sq ft. What is the rational for the 1000 sq ft callout?

Ben,
The rational for testing for every 1,000 s/f is; it represents the amount of concrete per truck load. A truck load of concrete will cover approximately 800 - 1,000 s/f 4-inches thick.
Regards
Rayt








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