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5.4 Rating table for Schmidt OS-120PM
The mortar joints can be classified using the rating table below.
Classification
Excellent
Very good
Good
Reasonable
Average
Poor
10 20 30 40 50 60 70 80 90 100
Rebound value R
The customer is free to create his own mortar specific rating table.
6. Technical data
Schmidt OS-120PT Schmidt OS-120PM
Measuring range See chapter 4.4 See chapter 5.4
Impact energy 0.833 Nm (0.614 ft lbf)
Hammer mass 720 g (1.59 lb) 665 g (1.47 lb)
Hammer head diameter 40 mm (1.57“) 8.0 mm (0.315“)
Weight 3.45 kg (7.60 lb)
Dimensions of housing 230 x 60 x 200 mm (9.06“ x 2.36“ x 7.87“)
Operating temperature -10 bis 50°C (32 bis 122°F)
Storage temperature -10 bis 70°C (14 bis 158°F)
7. Standards and Guidelines
7.1 Standards
The rebound number is determined on the basis of the following standards: EN12504-2 (Europe),
ASTM C 805 (North America), JGJ/T 23-2011 (China). Applies to Schmidt OS-120PT only.
For the creation of user defined conversion curves, we recommend the procedures described in EN
13791 (Europe), ASTM C805, ACI 228.1R (North America), JGJ T23-2011 (China), see chapter 4.4.
Applies to Schmidt OS-120PT only.
7.2 Guidelines
Austrian Guideline for tunnel lining, published December 2012. Austrian Construction Association.
(To determine the time for formwork removal during tunnel construction). Applies to Schmidt OS-
120PT.
TNO Report BI -88-009/61.8.2060-VOE from IBBC Delft Netherlands (Mortar joint testing). Applies
to Schmidt OS-120PM.
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