(3) Rollers for compaction will be paid for as provided in Section 212. 614.01 This item shall consist of damp-proofing concrete or masonry surfaces with tar or asphalt, as called for, in reasonably close conformity with these specifications and at the locations shown on the plans or ordered by the Engineer. Materials 614.02 Materials shall conform to the requirements specified in the following subsections: Primer Tar Asphalt__ 702.06(a) or (b) as applicable Construction Requirements 614.03 After the concrete is cured in conformity with the requirements given in Section 552, the surfaces to be damp-proofed shall be allowed to dry at least 10 days. They shall then be coated thoroughly with four coats of primer applied cold with a brush or spray gun and each coat shall be absorbed before the succeeding one is applied. After absorption of the fourth coat, a seal coat shall be heated if necessary and applied at a temperature compatible with the type of material and brushed or sprayed thoroughly into all surfaces. The seal coat shall have hardened before any water or earth is allowed to come against it. No coat shall be applied when the concrete or the preceding coat is damp, or at any time when the weather is unsuitable. Method of Measurement 614.04 The quantity to be paid for will be the actual number of square yards of surface damp-proofed, completed, and accepted. If a lump-sum payment is to be made, measurement will be in accordance with subsection 109.01. Basis of Payment 614.05 The quantity, determined as provided above, will be paid for at the contract price per unit of measurement for the pay item listed below that is shown in the bid schedule, which price and payment will be full compensation for the work prescribed in this section. Payment will be made under: 615.01 This item shall consist of the waterproofing of concrete surfaces in reasonably close conformity with these specifications, by the method designated in the bid schedule, and at the locations shown on the plans or ordered by the Engineer. Materials 615.02 Materials shall conform to the requirements specified in the following subsections: Primer for asphalt Primer for tar_. Tar for mop coat Asphalt for mop coat_. Waterproofing fabric_ Mortar Asphalt plank. Asphalt roll roofing. 702.06(a) 702.06(b) 702.06(c) 702.06(d) 702.06(e) 702.06(f) 702.06(g) 702.06(h) 705.04 Welded wire fabric 709.01 705.01 Construction Requirements 615.03 Membrane Waterproofing. Membrane waterproofing shall be a firmly bonded membrane composed of two layers of asphalttreated fabric and three moppings of asphalt or two layers of tartreated fabric and three moppings of tar, together with a coating of primer, all applied as follows: All concrete surfaces which are to be waterproofed shall be smooth and shall be free of projections or depressions that might cause puncture of the membrane. The surface shall be dry and free of dust and loose materials immediately before the application of the waterproofing. Waterproofing shall not be done in wet or freezing weather without written authorization from the Engineer. Asphalt shall be applied at a temperature between 300° and 350° F, (149 and 177 t° c) and tar between 200° and 250° F (93 and 121 t° c). A coating of primer shall be applied and allowed to dry before any mop coat is applied. The fabric shall be so laid that drainage will be over, and not against or along, the laps. It shall be "shingled" so that there will be two thicknesses at all points. Edge laps shall be at least 4 inches (102 mm) and end laps at least 12 inches (305 mm). One ply of fabric shall not touch another or the primed concrete surface since there must be three unbroken moppings. Beginning at the lowest point of the surface to be waterproofed, a primed section about 20 inches (508 mm) wide shall be mopped with the hot asphalt or tar. A strip of fabric of half the width of the roll shall be placed immediately on the hot asphalt or tar and pressed carefully into place so as to expel all entrapped air and obtain close conformity with the surface. This strip and an adjoining area of concrete surface, slightly more than one-half the width of a roll, shall then be mopped with hot asphalt or tar and a full-width strip of fabric shall be pressed into place as before, so as to cover completely the first strip. This second strip and an adjoining area of the concrete surface shall then be mopped with hot asphalt or tar and the third strip of fabric placed so as to lap the first strip by not less than 4 inches (102 mm). This process shall be continued until the entire surface is covered, each strip of fabric lapping at least 4 inches (102 mm) over the last strip but one. The entire surface shall then be mopped with hot asphalt or tar. The work shall be so regulated that at the close of the day's work the required mopping shall have been applied to all the fabric in place. Special care shall be taken to insure that all laps are thoroughly sealed down. Under no circumstances shall one layer of fabric touch another layer at any point or touch the unmopped surface. In all cases the mopping on concrete shall cover the surface so that no gray spots appear, and on cloth it shall be sufficiently heavy to completely conceal the weave. On horizontal surfaces not less than 12 gallons (.045 m3) of asphalt or tar shall be used for each 100 square feet (9.29 m2) of finished work, and on vertical surfaces not less than 15 gallons (.057 m3) shall be used. As the edges of the membrane and at any points where it surrounds such appurtenances as drains or pipes, suitable provisions shall be made to prevent water from getting between the waterproofing and the concrete surface. All flashing at curbs and against girders, spandrel walls, etc., shall be done with separate sheets lapping the main membrane not less than 12 inches (305 mm). Flashing shall be closely sealed either with a metal counterflashing or by embedding the upper edges of the flashing in a groove poured full of joint filler. Joints which are essentially open joints but which are not designed to provide for expansion shall first be caulked with oakum and lead wool and then filled with hot joint filler. Expansion joints, both horizontal and vertical, shall be provided with approved water stops in accordance with details on the plans and in Section 616. The membrane shall be carried continuously across all expansion joints. At the ends of the structure, membrane shall be carried well down on the abutments and suitable provision made for all movement. 615.03A Bridge Deck Waterproofing. Except as provided herein, subsection 615.03 shall apply. Bridge deck waterproofing shall be composed of an asphalt prime coat, two layers of asphalt-coated glass fabric, and three moppings of asphalt, or other approved protective systems as indicated on the plans or in the special provisions. The asphalt prime coat shall be applied by brush or hand roller so as to penetrate the concrete and provide bond between the concrete and the waterproofing. Primer shall be applied at the rate of 0.05 to 0.10 gallons per square yard (189 to 378 cm3 per 0.836 m2). Primer shall not be applied when the ambient air temperature is less than 60 degrees F (16 to c) and shall be allowed to cure a minimum of 4 hours prior to application of the waterproofing. Surfaces shall be dry so as to prevent the formation of steam when the hot asphalt is applied. No waterproofing shall be done in wet weather or when the temperature is below 50 degrees F (10 t° c). The bituminized glass fabric shall be shingled so that there will be at least two thicknesses at all points. Edge laps shall be at least 2 inches (50.8 mm). One ply of fabric shall not touch another or the primed concrete surface, since there must be three unbroken moppings. The first strip of fabric shall be one-half the width of the roll; the second shall be full width of the roll lapped with full width of the first strip; the third shall be full width of the roll lapped one-half the width of the second strip plus 2 inches (50.8 mm). Each succeeding strip shall lap one-half the width of the preceding strip so that there will be at least two layers of fabric at all points. No strips less than 12 inches (305 mm) wide shall be used. On horizontal surfaces not less than 3 gallons (11.4 dm3) and not more than 4 gallons (15.1 dm3) of asphalt mop coat shall be used for each mopping for each 100 sq. ft. (9.29 m2) of finished work; on vertical surfaces not less than 4 gallons (15.1 dm3) and not more than 5 gallons (18.9 dm3) for each mopping per 100 sq. ft. (9.29 m2) shall be used. Each strip of fabric shall be carefully pressed into place using a wide paint roller in order to eliminate all air bubbles and to provide a smooth flat surface. Waterproofing applied to surfaces which change abruptly in direction shall be reinforced at these points by application of an extra layer of fabric of suitable dimensions. The Engineer shall be considered the sole judge to determine an abrupt change. Care shall be taken to prevent damage to the waterproofing strips and course during the placing of the pavement or by any other construction operation. Planks, plywood, or suitable sheet material shall be laid over the waterproofing when any trucking or tracking is unavoidable. Any damage shall be repaired at no additional expense to the Government. A special waterproofing detail at the juncture of the concrete deck slab and the curb shall be installed as indicated on the plans and in conjunction with the placement of the bridge deck waterproofing. Approximately 121⁄2 inches (38.1 mm) of the waterproofing strip nearest the curbs shall be turned up into a specially provided recess directly beneath the face of the curb. Recess filler shall then be installed between the concrete deck and the underside of the curb and in front of the turned-up waterproofing. Waterproofing at the juncture of the deck slab and scuppers, expansion joints, manholes, etc., shall be accomplished by turning up the waterproofing at such junctures, with the waterproofing snug against the face to a point that will be flush with the wearing surface when placed. 615.04 Membrane Waterproofing with Mortar Protection. Waterproofing membrane to be protected with mortar shall be constructed in all particulars in accordance with the requirements of subsection 615.03. Every part of the membrane, except on undercut surfaces (the underside of parts of the structure the surface of which makes an angle of less than 90 degrees with a horizontal plane), shall then be covered with a course of reinforced mortar. This course shall have a nominal thickness of 2 inches (50.8 mm) and shall be reinforced with welded wire fabric of 6-inch (152 mm) mesh and No. 12 gage, (2.05 mm) or its equivalent, placed so as to lie midway between the top and bottom surfaces of the mortar. The top surface of the mortar course shall be troweled to a smooth, hard finish. The protective mortar course shall be cured by burlap held in close surface contact and kept wet for 72 hours. On undercut surfaces the membrane shall be protected with a layer of asphalt roll roofing laid in hot asphalt or tar instead of the mortar |