730 - EPOXY RESIN CRACK REPAIR ports as recommended by the material supplier and/ or the epoxy injection equipment manufacturer. Allow adhesive used to attach injection ports to cure for 24 hours before injecting the epoxy resin. Begin injecting at the lowest part of the concrete an d work upward as the cracks are filled. This will be evidenced by the presence of epoxy in th e next port above. On horizontal cracks proceed with injection from one end of the crack and work toward the other. Check for leaks in the surface sealed cracks during the epoxy injection operations. If leaks are found, repair the sealant with hot glue and tongue depressors or other methods approved by the Engineer. On cracks of ⅛ inch or wider, limit the back pressure to a maximum of 30 psi. On all other cracks, maintain the back pressure between 80 and 100 psi. After the injection is complete clean all surfaces of sealer and epoxy materials.
730.4MEASUREMENT AND PAYMENT
The Engineer will measure epoxy resin crack repair by the linear foot. Payment for "Epoxy Resin Crack Repair" at the cont ract unit price is full compensation for the specified work. 731 - AREA PREPARED FOR PATCHING (EXISTING CONCRETE BRIDGE DECKS)
700-116SECTION 731
AREA PREPARED FOR PATCHING (EXISTING CONCRETE BRIDGE DECKS)
731.1DESCRIPTION
Perform all work necessary to remove all asphalt material and unsound concrete from the existing bridge or the designated area to the depth speci fied in the Contract Documents, or as designated by the Engineer.
B I D I T E M S U N I T S Area Prepared for Patching Square Yard Area Prepared for Patching (Full Depth) Square Yard Area Prepared for Patching (Poured with Overlay) Square Yard Area Prepared for Patching (Set Price) Square Yard Area Prepared for Patching (Full Depth) (Set Price) Square Yard
731.2MATERIALS
Provide materials that comply w ith the applicable requirements. Concrete ................................................................................................................ SECTIONS 401 & 402 Aggregates for Concre te Not On Grade ................................................................ SECTION 1102 Concrete Curing/Pre cure Mate rials ....................................................................... DIVISION 1400 Reinforcing Steel ................................................................................................... DIVISION 1600 Epoxy Resin Base Bo nding Systems ..................................................................... DIVISION 1700 Rapid Set Concrete Patc hing Materials* ............................................................... SECTION 1716 *When specified in the Contract Documents.
On bridge decks that do not receive a concrete overlay, use coarse aggregate complying with SECTION 1102 , except grading must adhere to TABLE 731-1 .
TABLE 731-1: AGGREGATE GRADATION Sieve Size Percentage Retained ¾ " 0 ½ " 0-10 ⅜ " 15-50 #8 90-100
731.3CONSTRUCTION REQUIREMENTS
Documents and as designated by the Engineer, to the depth required to reach sound concrete and rust free reinforcing steel. Dispose of removed material on sites approved by the Engineer. Unless specifically noted in the Contract Documents, the Contractor may choose to remove unsound concrete by other means capable of removing the required concrete, without injury to the sound concrete and reinforcing steel. Unless specifically noted in the Cont ract Documents, the Contractor may not choose to remove unsound concrete by hydrodemolition. When hydrodemolition is allowed, remove the required concrete, without injury to the sound concrete and reinforcing steel. When hydrodemoliti on is allowed and used as the method of removal, the Engineer will determine the areas of unsound concrete after hydrodemolition. Do not use jack hammers or chipping hammers heavie r than the nominal 15-pound class on any partial depth concrete removal. Jack hammers up to the nominal 30-pound class may be used in areas of full depth patching to within 6 inches of the edges of the designated areas. Do not use chipping hammers heavier than a nominal 15-pound class to remove the 6-inch edge. Operate jack hammers an d chipping hammers at an angle to prevent damage to the sound concrete. 731 - AREA PREPARED FOR PATCHING (EXISTING CONCRETE BRIDGE DECKS) 700-117 (1) Reinforcing. Remove all scale and heavy rust from steel bars. When concrete is removed by jack hammers, wet sandblasting is prohibited. If reinforcing is left exposed, and signs of rust appear, the Engineer may require that the cleaning be repeated. Do not cut, stretch or damage any exposed reinforcing steel. Do not break the bond between the reinforcing steel and concrete where bars are partially ex posed yet remain anchored in sound concrete, near the ends or where more than half the bar is beneath the concrete removal line. See FIGURE 731-1 .
FIGURE 731-1
top layer of transverse reinforcing steel has been destroyed ( FIGURE 731-2 ), remove the concrete adjacent to the bar to a depth that shall permit concrete to bond to the entire periphery of the bar with a minimum clearance of ¾ inch. A bar may be considered bonded by the Engineer even if less than ½ the bar depth is embedded in concrete.
FIGURE 731-2
diameter of the steel is exposed ( FIGURE 731-3 ), or where the bond between existing concrete and reinforcing steel has been destroyed ( FIGURE 731-2 ), remove the concrete adjacent to the bars to a depth that shall permit concrete to bond to the entire periphery of the bar with a minimum clearance of ¾ inch. 731 - AREA PREPARED FOR PATCHING (EXISTING CONCRETE BRIDGE DECKS)
700-118FIGURE 731-3
required.
resin bonding agent. Apply the adhesi ve material according to the manufact urer’s recommendations, just prior to the placement of patching concrete. Pr ovide good bond of the patch material at the edges of the patch area by applying additional vibration or hand tamping. If epoxy resin dries, reapply another coating.
reinforcing steel, patch in segments to the size and spacing shown in the Contract Documents or as designated by the Engineer. After the initial segments have cured, if requ ired, patch the areas between segments. Heavy equipment, such as volumetric mixing equipment, is prohibited on full depth patches for a minimum of 24 hours after the curing period has ended.
monomolecular film may be used to prevent rapid evaporati on of water rising to the surface of the concrete. Do not use the film to work up grout as an aid to finishing operations. Use precure to prevent rapid evaporation between the initial strike off and brooming prior to covering with th e curing media at ambient air temperatures above 70ºF, or when combinations of temperature, low humidity and wind create conditions which, in the judgment of the Engineer, require hot weather procedure. Apply 1 or more light applications of monomolecular film as required by weather and finishing conditions. Complete curing as noted in subsection 731.3c.(4) .
prohibited when a descending air temperature falls below 45ºF. Do not start or resume concreting operations until the ascending ambient air temperature reaches 40ºF.
Use the course aggregate specified for wearing surface. Patching concrete sl ump must be 2 ½ to 3 ½ inches. Cure a minimum of 24 hours prior to placing the new overlay. On partial depth areas where there is no loss of bond with the reinforcing steel, fill patched with Grade 4.0(AE) concrete or with the type of concrete specified for the overlay. Pl ace partial depth patches less than 1 inch thick along with the overlay. The rema ining patches may be placed just before or as the overlay is placed, unless shown otherwise in the Contract Documents. Fill all prepoured patches to a level approximately ¼ inch below the top of the old existing deck. Cure the prepoured patches a minimum of 24 hours. Adhere to TABLE 731-2 for the minimum length of cure time after the placement of all full depth concrete patches and/or removal of adjacent concrete on segmental patching and prior to placi ng overlay.
731 - AREA PREPARED FOR PATCHING (EXISTING CONCRETE BRIDGE DECKS)
700-119TABLE 731-2: BRIDGE PATCHING CURING
Minimum length of Cure Time* Ambient Air Temperature Range (ºF) 48 hours Above 60 72 hours 40 to 60 120 hours 32 to 40 *In special circumstances, longer cure times may be required by the Engineer.
Use wet burlap or polyethylene sheet for curing or cure according to subsection 710.3e. and TABLE 710-1 for subdecks.
Documents or by the Engineer. Prior to removal, saw the perimeter of the patch, but do not saw into the reinforcing steel. Chip out the connecting edges below the sawed portion to nearly true lines. Do not damage sound concrete and dispose of the removed materials on sites approved by th e Engineer. Perform final cl eanup with a high pressure water jet with a minimum pressure of 3,500 psi or by sandblasting methods.
½ inches at the point of placement.
Vibrate using a spud vibrator. Do not touch the old concrete underneath. Tamp the concrete in place using hand tamps with a maximum of 36 square inches of face. Strike off and finish the patch with wooden floats, followed by a light brooming for final finish.
occur. Cure the concrete surface using wet burlap and polyethylene sheets according to subsection 710.3e. and TABLE 710-1 for bridge deck wearing surfaces. Keep the curi ng material in place for a minimum of 72 hours, unless designated otherwise by the Engineer. Keep burlap continuously wet during the curing period.
For shallow patches, 3 inches maximum depth, polymer concrete overlay resin and FA-C aggregate, TABLES 1102-3 and 1102-4, may be used. For deep patches, greater than 3 inches polymer concrete overlay resin with an approved MA-1 or MA-2 aggregate, TABLE 1102-6, may be used. The slurry polymer concrete system may be used for shallow and deep patching with the manufacturer/supplier’s recommendation. Mix and cure all patching according to manufacturer/supplier’s recommendations. (2) A Rapid Set Concrete Patching Material, compatible with the overlay may be used for patching the concrete bridge deck.
731.4MEASUREMENT AND PAYMENT
The Engineer will measure the area prepared for patchi ng by the square yard after the designated thickness of surface has been removed. The m easured pay quantity will be those areas sounded by the Engineer and marked as unsound or delaminated concrete. The Engineer will measure full depth patching prior to placement of patching concrete. The Engineer will measure areas of partial depth patc hing poured with the overlay before the overlay is placed. Pay quantity for partial depth patching will be the marked areas of unsound or delaminated concrete minus the sum of the partial depth patching poured with the overlay and the full depth patching. Payment for "Area Prepared For Patching" and "Area Pr epared For Patching (Full Depth)" at the contract unit prices and "Area Prepared For Patc hing (Set Price)" and "Area Prepared Fo r Patching (Full Depth) (Set Price)" at the contract set prices are fu ll compensation for the specified work when shown in the contract. 731 - AREA PREPARED FOR PATCHING (EXISTING CONCRETE BRIDGE DECKS)
700-120When the contract items include both "Area Prepared for Patching" and "Area Prepared for Patching (Full
Depth)", the price bid for "Area Prepared for Patching (Full Depth)" shall be a minimum of 1 ¼ times the price bid for "Area Prepared for Patching". Failure to comply with this requirement is cause for rejection of the bid. "Area Prepared for Patching (Poured with Overlay)" will be paid at 70% of the contract unit price for "Area Prepared for Patching" and is full compensation for the specified work. Payments made for of "Area Prepared for Patching (Poured with Overlay)" will be shown as an adde d item to the contract. Concrete for the partial depth patching poured with the overlay will be paid for as provided in the overlay specification. When no contract item is shown for "Area Prepared For Patching (Full Depth)" and upon approval of the Engineer, areas prepared for patching that are full depth requiring forming on the underside shall be paid for at a rate of 2 ¼ times the contract unit price per squa re yard of "Area Prepared For Patching". Concrete used to fill patched areas shall be subsidiary to other items of the contract. 732 - MACHINE PREPARATION (EXI STING CONCRETE BRIDGE DECKS)
700-121SECTION 732
MACHINE PREPARATION (EXISTING CONCRETE BRIDGE DECKS)
732.1DESCRIPTION
Prepare the bridge deck surface for a concrete bridge deck overlay by removing the existing concrete and asphaltic material from bridge deck and approaches as shown in the Contract Documents.
B I D I T E M U N I T S Machine Preparation (*) Square Yard *Thickness
732.2MATERIALS - None specified.
732.3CONSTRUCTION REQUIREMENTS
Remove concrete and asphaltic materials from the ex isting surface to the specified depth over the area of the deck by means of milling or cutting procedure capable of removi ng the specified material without injury to the sound concrete. When specified, mill the approaches according to the Contract Documents.
732.4MEASUREMENT AND PAYMENT
The Engineer will measure machine preparation by the s quare yard. Milling of approaches is subsidiary to the machine preparation bid item. Payment for "Machine Preparation" at the contract unit price is full compensation for the specified work. 733 – BRIDGE DRAINAGE SYSTEMS & DECK DRAIN EXTENSIONS
700-122SECTION 733
BRIDGE DRAINAGE SYSTEMS & DECK DRAIN EXTENSIONS
733.1DESCRIPTION
Provide and install the bridge drainage syst em as shown in the Contract Documents. Submit to the Engineer for approval shop drawings of the bridge drainage systems showing methods for accommodating thermal expansion, if necessary. Use 15 x 10 -6 in/in / ºF as the coefficient of thermal expansion for fiberglass systems. Include in the shop drawings the methods to be used to properly position the bridge drainage system for the temperature at the time of installation. Show the amount of adjustment required for temperature changes (in 10° increments). The mean temper ature shall be assumed 60ºF. Provide material for and install bridge deck drain extensions as shown in the Contract Documents.
B I D I T E M S U N I T S Bridge Drainage System (*) ** Bridge Deck Drain Extension Each *Steel or Fiberglass **Unit of Measure Shown in the Contract Documents
733.2MATERIALS
Provide materials that comply with the applicable requirements. Structural Steel Fabr ication and Painti ng ............................................................... DIVISION 700 Structural Steel ............................................................................................................ DIVISION 1600 Castings ..................................................................................................................... .. DIVISION 1600 Steel Fasteners ............................................................................................................. DIVISION 1600 Anchor Bolts for Structural Uses ................................................................................ DIVISION 1600 Steel Fasteners ............................................................................................................. DIVISION 1600 PVC Pipe ..................................................................................................................... DIVISION 1900 Fiberglass Pipes and Fittings ...................................................................................... DIVISION 1900
Joint Adhesive. Bond adhesive joint will be a vinyl ester resi n based product with si lica filler, polyester pigment, and methyl ethyl ketone peroxide catalyst. The a dhesive formulation will be certified proven suitable for the intended application. Certify the resin to have no additives that leach out, catalysts which remain active or other ingredients that could lead to deterioration.
733.3CONSTRUCTION REQUIREMENTS
the Contract Documents.
Use a standard sling, clamp or clevis ha nger as used in steel pipe applications. Use a split fiberglass pipe protectiv e sleeve bonded in place at all support lo cations of a length no less than the pipe diameter being supported. Install according to the approved shop drawing, Contract Documents, and guidelines and procedures recommended by the manufacturer. Install the fiberglass bridge drainage systems that wi ll not restrict movements between the substructure and superstructure or causes damage to the drainage system during expected thermal movements. The strap thickness will be 3/16 inch for all hangers, a minimum width of 1 ½-inch for 8-inch and 10-inch pipe and 2 inches for greater than 10 inches. The sling, clamp for clevis will be si zed to accommodate the pipe protective sleeve. Use a double nut on al l connectors to prevent over tightening a nd to lock the nuts against each other. Use bonded rigid couplers. Insert pipes so that the ends are centered. 733 – BRIDGE DRAINAGE SYSTEMS & DECK DRAIN EXTENSIONS
700-123Sand spigot ends to remove glossy finish and expose fibers . Insert pipe so it bottoms out within the bell fitting
to create a fully fitted joint. Mix and apply 2 layers of adhe sive according to the manu factures recommendations. Secure the joint so it cannot move, do not twist the joint. Do not disturb the joint until it has gelled according to the manufactures recommendations. An electric heat gun or heating co llar may be used to accelerate gelation of the joint.
1 ¾-inch long by ½ -inch diameter bolts with a flat washer and lock nut. Place the bolt head on the inside of the PVC pipe. Anchor the steel angles to the bottom of the deck using a concrete hex nut sleeve anchor. Use a 5/8-inch diameter sleeve anchor with an effective anchor length of 2 ½ inches and a bolt with a ½-inch diameter. Embed all anchors a minimum of 2 inches into the bottom of the concrete. Drill and place the anchors in accordance with the anchor manufacturer's recommendations. Plumb the completed drain extension and place the PVC pipe flush against the bottom of the concrete. Use PVC pipe lengths that extend a minimum of 12 inches below the bottom of the beam, girder, chord or slab. If the beam, girder, chord or slab is not of uniform de pth, vary the length of each ex tension to provide the 12-inch minimum.
733.4MEASUREMENT AND PAYMENT
The Engineer will measure bridge drainage system by the units shown in the Contract Documents. The Engineer will measure each bridge deck drain extension. Payment for "Bridge Drainage System" and "Bridge Deck Drain Extension" at the contract unit prices is full compensation for the specified work.