2.4.5.1
Chemical Composition
The chemical composition of the sealing compound shall meet the
requirements shown below:
PERCENT BY WEIGHT
COMPONENT
MIN.
MAX.
TEST
Bitumen (Hydrocarbon plastic)
50
70
ASTM D 4
Inert Mineral Filler
30
50
AASHTO T 111
Volatile Matter
2
ASTM D 6
2.4.5.2
Adhesion Under Hydrostatic Pressure
The sealing compound shall not leak at the joints for a period of 24 hours
under a vertical 2 m 6 foot head pressure. In a separate test, the sealing
compound shall not leak under a horizontal pressure of 65 kPa 10 psi which
is reached by slowly applying increments of 13 kPa 2 psi every minute.
2.4.5.3
Sag of Flow Resistance
Sagging shall not be detected when tested as follows: Fill a wooden form
25 mm 1 inch wide and 150 mm 6 inches long flush with sealing compound and
place in an oven at 58 degrees C 135 degrees F in a vertical position for 5
days.
2.4.5.4
Chemical Resistance
The sealing compound when immersed separately in a 5% solution of caustic
potash, a 5% solution of hydrochloric acid, 5% solution of sulfuric acid
and a saturated hydrogen sulfide solution for 30 days at ambient room
temperature shall show no visible deterioration.
PART 3
EXECUTION
3.1
JOINTS
Joints shall be installed at locations indicated and as authorized.
3.1.1
Contraction Joints
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NOTE: Since contraction joint strips are difficult
to align and maintain in alignment, the option for
use of joint strips should be deleted where
appearance is important or where concrete slabs will
not be covered with subsequent toppings that will
hide the joint.
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Contraction joints may be constructed by inserting tempered hardboard
strips or rigid PVC or HIPS insert strips into the plastic concrete using a
steel parting bar, when necessary, or by cutting the concrete with a saw
after concrete has set. Joints shall be approximately 3 mm 1/8 inch wide
and shall extend into the slab one-fourth the slab thickness, minimum, but
not less than 25 mm 1 inch.
SECTION 03150A
Page 9
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