the curing compound has been applied shall be resprayed by the method and
at the coverage specified above. Areas where the curing compound is
damaged by subsequent construction operations within the curing period
shall be immediately resprayed. Concrete surfaces to which membrane-curing
compounds have been applied shall be adequately protected during the entire
curing period from pedestrian and vehicular traffic, except as required for
joint-sawing operations and surface tests, and from any other possible
damage to the continuity of the membrane.
3.7.3
Moist Curing
Concrete to be moist-cured shall be maintained continuously wet for the
entire curing period, or until curing compound is applied, commencing
immediately after finishing. If forms are removed before the end of the
curing period, curing shall be carried out as on unformed surfaces, using
suitable materials. Surfaces shall be cured by ponding, by continuous
sprinkling, by continuously saturated burlap or cotton mats, or by
continuously saturated plastic coated burlap. Burlap and mats shall be
clean and free from any contamination and shall be completely saturated
before being placed on the concrete. Lap sheets to provide full coverage.
The Contractor shall have an approved work system to ensure that moist
curing is continuous 24 hours per day and that the entire surface is wet.
3.8
JOINTS
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NOTE: Edit bracketed items in following
subparagraphs to conform to design requirements.
Even if not required, dowels should be permitted for
construction joints. The effect of tie bars on the
pavement action and potential cracking should be
analyzed before requiring or permitting their use.
Remove joint types not required in the project.
**************************************************************************
3.8.1
General Requirements for Joints
Joints shall conform to the locations and details indicated and shall be
perpendicular to the finished grade of the pavement. All joints shall be
straight and continuous from edge to edge or end to end of the pavement
with no abrupt offset and no gradual deviation greater than 12 mm 1/2 inch.
Where any joint fails to meet these tolerances, the slabs adjacent to the
joint shall be removed and replaced at no additional cost to the
Government. No change from the jointing pattern shown on the drawings
shall be made without written approval of the Contracting Officer. Joints
shall be sealed immediately following curing of the concrete or as soon
thereafter as weather conditions permit. Joints shall be sealed as
specified in Section [02760 FIELD MOLDED SEALANTS FOR SEALING JOINTS IN
RIGID PAVEMENTS] [02762COMPRESSION JOINT SEALS FOR CONCRETE PAVEMENTS].
3.8.2
Longitudinal Construction Joints
Dowels [or keys] [or tie bars] shall be installed in the longitudinal
construction joints, or the edges shall be thickened as indicated.
[Dowels] [Tie bars] shall be installed in conformance with paragraph,
Placing Dowels and Tie Bars. [If any length of completed keyway of 1.5 m 5
feet or more fails to meet the previously specified tolerances, dowels
shall be installed in that part of the joint by drilling holes in the
hardened concrete and grouting the dowels in place with epoxy resin.]
SECTION 02753
Page 68
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