252 with burlap or cotton mats, it may be applied upon removal of the mats. The curing compound shall not be applied during rainfall. Curing compound shall be applied under pressure by mechanical sprayers. The spraying equipment shall be of the fully atomizing type equipped with a tank agi tator. The rate of application of the curing compound shall be as follows:
1.Pavement with Burlap Drag Finish -One Gallon Per Maximum of 150 sq. ft.
2.Pavement Requiring Groove Finish -One Gallon Per Maximum of 125 sq. ft. For unbonded concrete overlays, th e curing compound application rates noted below shall be doubled. At the time of use, the compound shall be in a thoroughly mixed condition with the pigment uniformly dispersed throughout the vehicle. During application the compound shall be continuousl y agitated. Hand spraying of odd widths or shapes and surfaces exposed by removal of forms will be permitted. Curing compound shall not be applied to the inside faces of joints to be sealed. Should the film become damaged from any cause within the requ ired curing period (72 hours after placement of concrete, unless otherwise specified), the damaged portions shall be immediately repaired with additional compound. Upon removal of the side forms, the sides of the exposed slabs shall be protected immediat ely with a curing treatment equal to that provided for the surface.
501.14.5 White Polyethylene Sheeting or Polyethylene Coated Burlap: The top surface
and sides of the pavement shall be entirely covered with polyethylene sheeting or polyethylene coated burlap. Units shall be lapped at least eighteen ( 18) inches. The covering shall be weighed down so as to remain in intimate contact wi th the surface covered. The covering shall extend at least twice the thickness of the pavement beyond the edges of the slab. The covering shall be maintained in place at least 72 hours after the concrete is placed, unless otherwise specified.
501.15 Removing Forms :
Forms shall not be removed until at least 12 hours after placement of the concrete. Forms shall be removed carefully so as to avoid damage to the slab. As soon as the side forms have been removed, minor honeycombed areas shall be filled with mortar composed of one part cement to two parts fine sand and cured as outlined in one of the methods indicated above. Major honeycombed areas shall be removed and replaced. All areas or sections so removed shall be not less than ten ( 10) feet in length nor less than the full width of the traffic lane involved. Any remaining portion of the slab adjacent to the joints that is less than ten (10) feet in length shall also be removed and replaced. Slabs shall be cut by sawing full depth for removal.
501.16 Sealing Joints :
All transverse contraction and construction joints to be sealed shall have the preformed elastomeric seal installed or shall be filled with silicone sealer before the pavement is opened to traffic, including construction traffic, and as soon after completion of curing as is feasible. All longitudinal joints shall be sealed with silicone seala nt. Cleaning and sealing of all joints is not required unless shown in the Plans.
501.16.1 Silicone Sealant: Following forming, initial sawing and final or second -step
sawing operations, the joints shall have been cleaned in accordance with subsectio na 501.11.8. In preparation for sealing, all joints that have become contaminated since those forming or 253 sawing operations shall be cleaned by wire brushing, sandblasting, or a high pressure water blast or by a combination of these methods. Just prior t o installing the back -up material, the joints shall be blown out with compressed air at a pressure of at least 90 psi to remove all dust, loose particles and debris. Air compressors used for this purpose shall be equipped with traps capable of removing mo isture and oil from the compressed air. A joint shall not be sealed until it is thoroughly clean and dry. When recommended by the manufacturer, the vertical surfaces of joints shall be fully wetted by a primer. The primer and application, including all safety precautions, shall be as per the manufacturer's recommendations. The primer shall be allowed to dry tack -free prior to installation of the backer rod. The back -up material shall be installed in the joint at the required depth. The silicone sealant shall then be applied from inside the joint in a manner which causes it to wet the joint faces and to reasonable close conformity with the required dimensions. Immediately following placement of the sealant and before a skin forms, the sealant shall be tooled to force it against the joint faces and to provide a slightly concave surface with a depth of approximately ¼ inch (at the center of the joint) below the pavement surface. Any unreasonable deviation from the required joint or sealant dimensions will be just cause for rejection of the joint until satisfactory corrective measures are taken by the Contractor at no additional cost to the Division . Any failure of the joint material in either adhesion or cohesion will be cause for rejection of the joint, and the joint shall be repaired to the Engineer's satisfaction by the Contractor at no additional cost to the Division. Silicone sealant shall never be applied to frozen, dirty, wet, or damp concrete or during inclement weather conditions. Silico ne sealant shall not be placed in the joints without the approval of the Engineer when the temperature at the surface of the concrete is less than 40 F.
501.16.2 Performed Elastomeric Seal: The dimensional requirements shall be as
specified on the Plan s. Joints shall be clean and dry at the time the elastomeric seal is installed. Just prior to installation of the seal, the lubricant -adhesive shall be applied to the joint faces or the sides of the seal, or both, to facilitate installation of the seal a nd to help secure the seal in place in the joint. The lubricant -adhesive shall be applied in such a manner as to cover both sides of the seal over the full area in contact with the joint faces. Any lubricant -adhesive that gets on top of the seal shall be immediately removed. Seals shall be installed in a substantially full compressed condition with the vertical axis of the seal parallel to the joint faces. Seals shall be installed in the joints to the depth shown on the Plans using suitable machines or tools that will not twist, curl, nick, notch, or otherwise damage the seal and that will insert the seal in such a manner that elongation of the seal shall not exceed five percent (5%) . The in place seals shall be one -piece construction, without field or factory splices, for the full length of the joint. Any seal that is damaged during installation shall be removed and replaced with a new, undamaged seal. Any seal that is improperly installed or po sitioned in the joint or that shows more than five percent (5%) elongated following installation shall be removed and properly reinstalled or replaced.
501.17 Protection of Pavement :
The Contractor shall protect the pavement and its appurtenances against both public traffic and the traffic caused by their own employees and agents. This protection shall include watchmen to direct traffic, and the erection and maintenance of warning si gns, lights, barricades, pavement
Source: West Virginia Standard Specifications for Road and Bridge Construction, 2023 Edition. Pages 270–271 of 1,006.