burlap shall be kept saturated by means of a mechanically operated
sprinkling system. In place of the sprinkling system, at the Contractor’s
option two layers of burlap covered with impermeable covering shall be
used. The burlap shall be kept saturated with water. Plastic coated burlap
may be substituted for one layer of burlap and impermeable covering.
The blankets shall be placed so that they are in contact with the edges of the
concrete, and that portion of the material in contact with the edges shall be
kept saturated with water.
(4) Membrane Curing Method. Membrane curing will not be permitted
where a protective coat, concrete sealer, or waterproofing is to be applied or
at areas where rubbing or a normal finish is required, or at construction
joints other than those necessary in pavement or base course. Concrete at
these locations shall be cured by another method specified in Article
1020.13(a) at no additional cost to the department.
After the concrete has been finished and immediately after the water sheen
has disappeared from the surface of the concrete, the surface shall be sealed
with membrane curing compound of the type specified. The seal shall be
maintained for the specified curing period. The edges of the concrete shall,
likewise, be sealed immediately after the forms are removed. Two separate
applications, applied at least one minute apart, each at the rate of not less
than 1 gal/250 sq ft (0.16 L/sq m) will be required upon the surfaces and
edges of the concrete. These applications shall be made with the mechanical
equipment specified. Type III compound shall be agitated immediately
before and during the application.
At locations where the coating is discontinuous or where pin holes show or
where the coating is damaged due to any cause and on areas adjacent to
sawed joints, immediately after sawing is completed, an additional coating
of membrane curing compound shall be applied at the above specified rate.
The equipment used may be of the same type as that used for coating
variable widths of pavement. Before the additional coating is applied
adjacent to sawed joints, the cut faces of the joint shall be protected by
inserting a suitable flexible material in the joint, or placing an adhesive
width of impermeable material over the joint, or by placing the permanent
sealing compound in the joint. Material, other than the permanent sealing
compound, used to protect cut faces of te joint, shall remain in place for the
duration of the curing period. In lieu of applying the additional coating, the