2010 Construction and Material Specifications - Ohio Department of ...

497
621.05
When a casting is inserted in the cut without casting adhesive to test proper cut,
at least 3 of the 4 leveling lugs/tabs must contact the pavement surface and all four
keel-ends of castings must be below the pavement surface.
Each casting must be centered lengthwise and should have 1/16” to 1/8” (1.5
mm to 3 mm) clearance between pavement cut and casting for casting adhesive to
bond properly. Only the leveling lugs/tabs should be in contact with the pavement
surface after insertion of casting in pavement so that a minimum of 1/16” (1.5 mm)
of casting adhesive is the bonding adhesive between the casting and pavement.
The casting adhesive must fill all voids.
The pavement cut must be completely dry and free of dust, dirt or any other
material that will interfere with the adhesive bond to the casting and the pavement.
Casting adhesive on the active reflector face must be removed immediately.
Install the RPM casting within 24 hours after cutting the slots into the
pavement. On new pavement surfaces, the Contractor may begin RPM placement
as soon as the pavement markings for that section are completed and dry.
Ensure that the RPM casting is free of dirt, dust, oil, grease, rust, moisture, or
any foreign matter that impairs adhesion to the pavement.
Place RPMs when the pavement surface temperature and the ambient air
temperature are at least 40 °F (5 °C) and the pavement is dry. Heat both parts of
the RPM casting adhesive to 100 ± 10 °F (38 ± 5 °C) during installation when
either the pavement surface or ambient air temperature is between 40 and 50 °F (5
and 10 °C).
Ambient Air
Temperature
Minimum Period
Protected from Traffic
°F (°C) Minutes
100 (38) 15
90 (32) 20
80 (27) 25
70 (21) 30
60 (16) 35
50 (10) 45
40 (5) 60
Do not allow traffic on the RPMs until the adhesive has cured.
Two component approved casting adhesive is used to fill the pavement cut to
within approximately 3/8” (9 mm) of the top of the pavement cut. A minimum of
3 of the 4 leveling lugs/tabs must be in contact with the pavement surface and the
casting adhesive should ooze out from under the casting from all sides filling all
voids around the casting and be level with the pavement surface.
Mix the casting adhesive according to the manufacturer’s recommendations.
Complete the mixing operation and placing of the RPMs rapidly. Do not use any
mixed batch that becomes so viscous that it cannot be readily extruded from under
the RPM with light pressure.