465 SECTION 619 WATERPROOFING
619.1 -DESCRIPTION : This work shall consist of waterproofing concrete retaining walls, abutments, earth -filled arches, and concrete decks, either in the form of dampproofing (primers with bituminous paint coat) or membrane waterproofing ( primers with bituminous membrane fabric, with or without protection course) as specified on the Plans. Dampproofing shall consist of a primer and two coats of bituminous materials. Membrane waterproofing shall consist of a primer, two layers of fabric, and three moppings of hot bituminous material. The work shall be done in accordance with the Specifications and as shown on the Plans.
619.2 -MATERIALS : The materials shall conform to the requirement of the several Su bsections of Division 700 of these Specifications as follows:
MATERIAL SUBSECTION TYPE Dampproofing Agent 705.4, 705.11
705.7SS-1 or SS -1h
CSS-1 or CSS -1h Dampproofing Primer 705.4, 705.11 or 705.8 SS-1 or SS -1h CSS-1 or CSS -1h Hot-Poured Elastic Type Concrete Joint Sealer 708.3 Membrane Waterproofing 705.8 Membrane Waterproofing 705.7 Reinforcing Steel 709.3 Waterproofing Fabric 715.8
When the dampproofing agent is SS -1, the primer shall be SS -1 to which shall be added a maximum of 15 percent (15%) water by weight. Membrane fabric shall be stored in a dry, protected place. The rolls shall not be stored on end.
CONSTRUCTION METHODS
619.3 -PREPARATION OF SURFACE : Before applying the primer coat, all rod holes and other voids shall be pointed, and all projections, loose material, and excess dust shall be removed from the surface. When emulsion is used, the surface may be damp. When asphalt is used, the surface shall be thoroughly dry. Should the surface be damp, it shall be covered with a two ( 2) inches layer of hot sand which shall be allowed to remain for two hours, after which it shall be swept back, uncovering sufficient surface for beginning of work, and the operation repeated as the work progresses. For surfaces too steep to hold sand, other satisfactory methods to produce a dry surface shall be used. No waterproofing shall be done in wet weather or when the temperature is below 35° F, without written authority of the Engineer.
466 619.4 -DAMPPROOFING : The entire surface to be dampproofed shall be covered with the required primer by use of a mo p. After this primer has been allowed to cure, two successive moppings with an asphalt cement or asphalt emulsion shall be applied. All coats shall be of uniform thickness throughout, and the total bituminous material used shall be not less than 11 gallo ns per 100 square feet of surface. Each coat shall be allowed to dry thoroughly before the following coat is applied. Before dampproofing is started, all construction joints shall be waterproofed in accordance with subsection 619.5, with fabric membranes twenty -four ( 24) inches wide for the full length of the joint.
619.5 -MEMBRANE WATERPROOFING : The asphalt primer shall be heated to a temperature between 100 and 125° F, with frequent stirring to avoid l ocal overheating. The asphalt for waterproofing shall be heated to a temperature between 300 and 350° F, with frequent stirring to avoid local overheating. The heating kettles shall be equipped with thermometers. In all cases, the waterproofing shall be gin at the low point of the surface to be waterproofed so that water will run over and not against or along the laps. The first strip of fabric shall be of half width, the second shall be of full width, lapped the full width of the first sheet, and the th ird and each succeeding strip shall be the full width and lapped so that there will be two layers of fabric at all points with three -layer lap for a distance not less than two ( 2) inches. All two -layer end laps shall be at least twelve ( 12) inches. The procedure for applying primer and waterproofing with membrane fabric shall be as follows:
mopped with a primer of cutback asphalt and allowed to cure. ii. A section slightly more than half the width of the membrane fabric and for the full length of the surface shall be mopped with an asphalt cement and a half width of the fabric pressed in to place. iii. The half width of fabric and an adjacent section of the surface equal to slightly more than half the width of the fabric shall be mopped with an asphalt cement and a full width of fabric pressed into place, completely covering the first strip. iv. Slightly more than half of this second strip and an adjacent section of the concrete surface equal to slightly more than half the width of the fabric shall be mopped with an asphalt cement, and the third strip of fabric shingled on so as to lap the first str ip more than two ( 2) inches. This process shall be continued until the entire surface is covered with two layers of fabric.
The completed waterproofing shall be firmly bonded membrane composed of two layers of fabric and three moppings of asphalt, together with a coating of primer. Under no circumstances shall one layer of fabric touch another layer at any point, or touch the surface of the structure, unless separated from th at layer or surface by one coat of asphalt. On horizontal surfaces, not less than 13 gallons of asphalt shall have been used for each 100 square feet of finished work; and on vertical surfaces, not less than 16 gallons shall have been used. The work shal l be so regulated that at the close of a day's work all fabric that is laid shall have received the final mopping of asphalt. Special care shall be taken at all laps to see that they are thoroughly sealed.
467 619.6 -DETAILS : At the edges of the membrane and at any point where it is punctured by drain, pipes, etc., suitable provisions shall be made to prevent water from getting between the waterproofing and the surface waterproofed. All flashing at curbs and against girders, spandrel walls, etc., shall be done with separate sheets lapping the main membrane not less, than twelve ( 12) inches . Flashing shall be closely sealed either with a metal counter flashing or by embedding the upper edges of the flashing in a groove poured full of joint sealing material. Joints which are essentially open joints, but which are not designed to provide for expansion, shall first be caulked with oakum and leadwool and then filled with hot joint sealing material. Expansion joints, both horiz ontal and vertical, shall be provided with sheet copper in "U" or "V" form, in accordance with the details shown on the plans, and shall be filled with hot joint filler sealing material. The membrane shall be carried continuously across all expansion or construction joints. At the ends of the structure, the membrane shall be carried well down on the abutments and suitable provision made for all movement. Care shall be taken to prevent injury to the finished membrane by the passage over it of men, wheelba rrows, etc., or by throwing any material on it. Any damage which may occur shall be repaired by patching. The first layer of the membrane patch shall extend at least twelve (12) inches beyond the outermost damaged portion, and the second ply shall extend at least three ( 3) inches beyond the first ply.
619.7 -PROTECTION COURSE : Over the waterproofing membrane constructed as specified above, there shall be placed a protection course which shall be three ( 3) inches of Class A concrete. This concrete shall be reinforced midway between its top and bottom surface with wire mesh havin g six (6) inch openings each direction and using size # W 1.4 wire. The construction of the protection course shall immediately follow the waterproofing operations and shall conform to the applicable requirements of 601.
619.8 -METHOD OF MEASUREMENT : The quantities of work done will be measured in square yards of "Dampproofing", "Membrane Waterproofing without Protection Course", or "Membrane Waterproofing with Protection Course", as the case may be, compl ete in place and accented, determined from actual measurement of the work.
619.9 -BASIS OF PAYMENT : The quantities, determined as provided above, will be paid for at the contract unit prices bid for the items l isted below, which prices and payments shall be full compensation for furnishing all the materials and doing all the work prescribed in a workmanlike and acceptable manner, including all labor, tools, equipment, supplies, and incidentals necessary to compl ete the work.
619.10PAY ITEMS :
ITEM DESCRIPTION UNIT 619001 -* Dampproofing Square Yard 619002 -* Membrane Waterproofing Without Protection Course Square Yard 619003 -* Membrane Waterproofing With Protection Course Square Yard
* Sequence number
468 THREE -SIDED REINFORCED CONCRETE BRIDGE/CULVERT
620.1 -DESCRIPTION : This work shall consist of furnishing the design, construction plans, materials, and construction of single piece precast or cast -in-place reinforced concrete three -sided flat -topped bridge/culverts or single piece precast reinforced concrete three -sided arch -topped bridge/culverts or a two -piece precast reinforced concrete continuous arch bridge/culverts, with headwalls and wingwalls, in accordance with these specifications and in reaso nably close conformity with the lines, grades, design, and dimensions shown in the plans.
620.2 -GENERAL : The bridge/culvert design and detail plans for construction shall be submitted t o the Engineer for approval. The time required for preparation and review of these submittals shall be charged to the allowable contract time. Delays caused by untimely submittals or insufficient data will not be considered justification for time extensio ns. No additional compensation will be made for any additional material, equipment, or other items found necessary to comply with the project specifications as a result of the Engineer's review. The proposed bridge/culvert design shall be compatible with the Contractor's proposed method of construction, and shall be compatible with any method of construction shown in the plans. The Division does not assume nor warrant any bridge/culvert system's compatibility with any particular construction methods.
620.3-DESIGN CRITERIA : 620.3.1 -General: The following data will be provided on the contract plans:
box i n addition to the bearing capacity and roadway profile.
The size of all structural elements shall be determined such that the design load stresses do not exceed the allowable stresses found in the AASHTO LRFD Bridge Design Specifications, latest editio n. The structural design of the two -piece precast reinforced concrete arch bridge/culverts shall provide for a structurally reinforced section at the crown/closure section such that the completed arch bridge/culvert is structurally continuous. If parape ts are used on any portion of the headwalls and wingwalls as shown in the plans, they shall be designed to resist traffic loads in accordance with the AASHTO LRFD Bridge Design Specifications, latest edition. The load shall be a HL -93 (HS25) test level 3. The length and height of the wingwalls and headwalls must be designed to accommodate the specified fill slope without fill encroaching on the underlying streambed, waterway or edge