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+--- Thread: RH Test Hole Callout (/showthread.php?tid=7)
RH Test Hole Callout - Ben - 09-26-2008 09:40 AM
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?
RE: RH Test Hole Callout - rthompson - 09-26-2008 01:58 PM
(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
RE: RH Test Hole Callout - CMoore - 10-27-2008 08:21 AM
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.
RE: RH Test Hole Callout - rthompson - 11-04-2008 10:03 AM
(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