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5. Step by Step Guide
“Relative Humidity Testing according to ASTM F2170”
For details please check the ASTM F2170-09 standard.
Step 1: Check the correct functionality of the instrument (Chapter 8, ASTM F2170-9)
Recalibrate probes annually•
Check periodically the correct functionality of instrument and probe with the humidity •
standard tube (780 10 470)
Step 2: Conditioning (Chapter 9, ASTM F2170-9)
Concrete floor slab and air space surrounding slab shall be at service temperature /
humidity for at least 48 hours.
Step 3: Define number of test holes (Chapter 10.1, ASTM F2170-9)
3 test holes for the first 1000 ft•
2
/ 100 m2
at least 1 additional test hole for each additional 1000 ft•
2
/ 100 m
2
Step 4: Define depth of test holes (Chapter 10.2, ASTM F2170-9)
40% of slab thickness if slab is drying from top only•
20% of slab thickness if slab is drying from top and bottom•
Step 5: Drill and prepare test holes (Chapter 10.3, ASTM F2170-9)
Drill hole using a 8mm /
5/16in drill bit
Clean test hole
Cut sleeve according to
measuring depth
Insert sleeve in test hole
and close cap
Cast holes (Chapter 10.4, ASTM F2170-9)
Use “Add-on for wet
concrete” (780 10 370)
Cut sleeve and rod
according to measuring
depth
Remove rod after concrete hardens
Close cap
Step 6: Wait 72 hours for moisture equilibrium (Chapter 10.3.4, ASTM F2170-9)
Step 7: Measurements (Chapter 10.5, ASTM F2170-9)
Insert In-Situ probe into
sleeve
Wait for temperature
equilibrium
Check for stable value
(trend indicator) before
record data
Measure ambient
condition
Step 8: Report (Chapter 11, ASTM F2170-9)
Use the Test Report template (chapter 6) to record and report all necessary information.