Officer. The epoxy resin materials shall be placed in the cavity in layers
not over 50 mm 2 inches thick. The time interval between placement of
additional layers shall be such that the temperature of the epoxy resin
material does not exceed 60 degrees C 140 degrees F at any time during
hardening. Mechanical vibrators and hand tampers shall be used to
consolidate the concrete or mortar. Any repair material on the surrounding
surfaces of the existing concrete shall be removed before it hardens.
Where the spalled area abuts a joint, an insert or other bond-breaking
medium shall be used to prevent bond at the joint face. A reservoir for
the joint sealant shall be sawed to the dimensions required for other
joints. The reservoir shall be thoroughly cleaned and then sealed with the
sealer specified for the joints. [In lieu of sawing, spalls not adjacent
to joints and popouts, both less than 150 mm 6 inches in maximum dimension,
may be prepared by drilling a core 50 mm 2 inches in diameter greater than
the size of the defect, centered over the defect, and 50 mm 2 inches deep
or 12 mm 1/2 inch into sound concrete, whichever is greater. The core hole
shall be repaired as specified above for other spalls.]
3.10
EXISTING CONCRETE PAVEMENT REMOVAL AND REPAIR
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NOTE: It is imperative that sufficient exploration
be made (not just reference to as-built drawings)
for the designer to know exactly what the in-place
existing pavement thickness and load-transfer are at
the jointing area--dowels, keys, tie bars, etc--and
its condition. Normally, the joint between the new
pavement and existing pavement should be made at an
existing joint in the old pavement.
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Existing concrete pavement shall be removed at locations indicated on the
drawings. Prior to commencing pavement removal operations, the Contractor
shall inventory the pavement distresses (cracks, spalls, and corner breaks)
along the pavement edge to remain. After pavement removal, the remaining
edge shall again be surveyed to quantify any damage caused by Contractor's
removal operations. Both surveys shall be performed by the Contractor, in
the presence of the Contracting Officer. Repairs shall be made as
indicated and as specified herein. All operations shall be carefully
controlled to prevent damage to the concrete pavement and to the underlying
material to remain in place. All saw cuts shall be made perpendicular to
the slab surface, forming rectangular areas.
3.10.1
Removal of Existing Pavement Slab
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NOTE: The saw cut at a distance from the joint
should be sawed with a wheel saw which produces a 38
mm (1-1/2 inch) or wider kerf and better prevents
stress from propagating across the saw cut.
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When existing concrete pavement is to be removed and adjacent concrete is
to be left in place, the joint between the removal area and adjoining
pavement to stay in place shall first be cut full depth with a standard
diamond-type concrete saw. Next, a full depth saw cut shall be made
parallel to the joint at least 600 mm 24 inches from the joint and at least
150 mm 6 inches from the end of any dowels. This saw cut shall be made
with a wheel saw as specified in paragraph: Sawing Equipment. All pavement
SECTION 02753
Page 72
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