5-137 SECTION 509 – CONCRETE BRIDGE DECK SURFACE PREPARATION
509.01 DESCRIPTION . This work shall consist of blanket diamond grinding concrete bridge deck s.
509.02 MATERIALS . Materials shall meet the requirements of the following subsections:
Water ................................ ................................ ................................ .......................... 745.01
509.03 SUBMITTALS . The Contractor shall submit a blanket grinding work plan to the Engineer. At a
minimum, the submittal shall include detailed procedures and information for the following:
a.Determining initial grinding depth.
b.Monitoring depth of grinding.
c.Determining location of wheel paths.
d.Depth of grinding for the second pass and any subsequent passes.
e.Repair procedures if the deck is damaged during grinding operations.
f.Remedial action if depressions exceed geometric limits of grinding.
1.Means of determining remaining clear cover over reinforcing steel for further grinding.
2.Subsequent grinding patterns if sufficient clear cover remains over the reinforcing st eel.
g.Manufacturer’s specifications for concrete bridge deck grinding equipment. The Agency will review the submittal for compliance with the requirements of the Contract. If the procedures or information do not conform to the Contract requirements, th e submittal will be returned as rejected. The submittal shall not be marked as approved or approved as noted until all of the required information has been received and reviewed. Once a complete submittal has been received, the Agency shall be allowed 21 c alendar days for the initial review period and 14 calendar days for the review of each subsequent resubmittal. The Contractor will not be permitted to begin grinding until the blanket grinding work plan has been marked as approved or approved as noted by the Agency. After the blanket grinding work plan has been marked approved or approved as noted, no changes shall be made without the written approval of the Agency. 5-138 509.04 CONSTRUCTION REQUI REMENT S.
a.Concrete Bridge Deck Grinding Equipment . The gr inding equipment shall be power driven, self- propelled, and specifically designed to smooth and texture Portland cement concrete with diamond blades or diamond impregnated cylinder rings. The equipment shall have a minimum weight of 35,000 pounds , including the grinding head, and shall be capable of grinding a strip at least 3 feet wide. The effective wheelbase of the machine shall be no less than 12 feet. The equipment shall have a positive means of vacuuming the grinding residue from the deck pav ement surface, leaving the surface in a clean, near -dry condition. The equipment shall have a set of pivoting tandem bogey wheels at the front of the machine and rear wheels or tandem bogies that travel and track on the fresh ly cut surface. The equipment shall be maintained to ensure it is in proper working order, with attention paid to the roundness of the match and depth control wheels. Any wheels found to be out of round shall be immediately replaced. The equipment shall be capable of grinding the surface in the longitudinal direct ion without causing spalls or other damage at cracks, joints, and other locations. Grinding equipment that causes raveling, aggregate fractures, or distu rbance to the joints shall not be permitted. The equipment shall be capable of correcting the bridge deck profile and provid ing the proper cross slope. The equipment shall be capable of grinding all concrete bridge deck materials, including rapid set concrete and ultra -high performance concrete (UHPC). If the Contract specifies the use of UHPC, the grinding of the UHPC surface shall be performed when a mi nimum compressive strength of 10 ksi has been achieved and per the manufacturer’s recommendations. If significant fiber pullout is observed during grinding operations, grinding shall be suspended and not resumed until approved by the Engineer. The Contrac tor shall provide equipment capable of feathering longitudinal ridges along the limits of grinding that remain after grinding is complete.
b.Concrete Bridge Deck Grinding . Grinding operations shall not begin until the effective cure time for the bridge deck concrete is complete and the wearing course of bituminous concrete pavement has been placed on the bridge approaches. A minimum of two passes are required. 5-139 Grinding operations shall be performed in a longitudinal direction and provide a uniform finished texture. The beginning and end grinding lines shall be normal to the bridge centerline or along the deck skew. Grinding shall terminate 10 feet beyond the ends of the concrete bridge deck in the bituminous concrete pavement, except for locations with steel bridge joints or as otherwise directed by the Engineer. Unless otherwise indicated in the Contract, grinding shall be terminated as specified in Table 509.04A . TABLE 509.04A – GRINDING TERMINATION DISTANCE REQUIREMENTS Location Closest Allowable Distance (in.) Farthest Allowable Distance (in.) Drainage structure 4 15 Face of curb or barrier 4 15 Steel bridge joint system 1 4 15 1 Dimension measured perpendicular to the centerline of the steel bridge joint system.
1.Geometric Requirements . Each pass shall grind a strip at least 3 feet wide and not exceed the following vertical criteria:
a.Unless otherwise noted on the Plans, the maximum depth of material removed by diamond grinding shall be 3/4 inch.
b.The maximum vertical difference between longitudinal passes shall be 1/8 inch.
c.Proposals to correct depressions exceeding the allowable grinding depth shall be submitted to the Engineer for approval. All depressions shall meet the specified grinding sm oothness and texture requirements post remediation.
2.Smoothness . After grinding, the deck shall have a uniform transverse and longitudinal slope with no depressions or misali gnment of slope greater than 1/8 inch in 10 feet when tested with a 10 foot straightedge. The surface will be checked at random by the Engineer during the grinding operation to ensure that no depressions exist that will pond water. The straightedge will be placed in contact with the surface in successive positions parallel to and perpendicular to the centerline of the structure. If the existing concrete surface is parabolic, the straight edge test shall not be used across the parabolic surface. 5-140 (3) Texture . The surface texture shall be a parallel, corduroy -type consisting of gro oves between 1/16 inch and 1/8 inch wide. The peaks of the ridges shall be approximately 1/16 inch higher than the bottom of the grooves.
4.Cleaning . Grinding residue shall be removed with a vacuum attached to the grinding machine. The vacuum shall leav e the deck surface in a clean, near dry condition. Grinding residue shall be disposed of at an appropriate disposal facility.
5.Grinding Operations . Grinding shall continue until one of the following criteria is approved by the Engineer:
a.The surface meets the smoothness and texture required .
b.The maximum depth of grinding, texture, and depression remediation measures are met.
6.Feathering Ridges along Limits of Grinding . Longitudinal ridges along the limits of grinding that remain after grinding is complete shall be feathered out to provide a uniform transition from the deck surface at the face of curb or barrier to the finished deck surface after grinding.
509.05 METHOD OF MEASUREMENT . The quantity of Concrete Bridge Deck Surface Prepar ation to
be measured for payment will be the number of square feet of concrete bridge deck surface prepared in the complete and accepted work. Measurement will be based on the horizontal distance between the face of curb or barrier as shown on the Plans an d the longitudinal length of the bridge deck. The longitudinal length measured for payment will be extended by 10 feet beyond each end of the bridge deck except for locations with steel bridge joints or as otherwise directed by the Engineer.
509.06 BASIS OF PAYMENT . The accepted quantity of Concrete Bridge Deck Surface Preparation will
be paid for at the Contract unit price per square foot. Payment will be full compensation for grinding the bridge deck; furnishing and implementing the required submittals; and for furnishing all materials, labor, tools, equipment, and incidentals necessary to complete the work. Payment will be made under: Pay Item Pay Unit 509.1500 Concrete Bridge Deck Surface Preparation ................................ .............. Square Foot 5-141 SECTIO N 510 – PRESTRESSE D CONCRETE 510.0 1 DESCRIPTION . This work shall consist of manufacturing, transporting, and erecting precast prestressed concrete members. 510.0 2 MATERIALS . Materials shall meet the requirements of the following subsection s: Portland Cement ................................ ................................ ................................ ......... 701.02 High Early -Strength Portland Cement ................................ ................................ .......701.0 3 Portland -Pozzolan Cement ................................ ................................ ......................... 701.0 4 Portland -Limestone Cement ................................ ................................ ...................... 701.0 5 Portland Blast -Furnace Slag Cement ................................ ................................ ......... 701.0 6 Ternary Blended Cement ................................ ................................ ........................... 701.0 7 Fine Aggregate for Concrete ................................ ................................ ...................... 704.01 Coarse Aggregate for Concrete ................................ ................................ .................. 704.02 Lightweight Fine Aggregate for Concrete ................................ ................................ .704.19 Mortar, Type IV ................................ ................................ ................................ ......... 707.0 1(e) Preformed Joint Filler, Cork, and Asphalt -Treated Felt ................................ ............ 707.0 6 Polyvinyl Chloride (PVC) Waterstop ................................ ................................ ........ 707.08 Bar Reinforcement ................................ ................................ ................................ .....713.01 Prestressing Strand and Post -Tension ing Strand ................................ ....................... 713.0 4 Structural Steel ................................ ................................ ................................ ........... 714.02 High -Strength Low -Alloy Structural Steel ................................ ................................ 714.03 Carbon Steel Bolts, Nuts, and Washers ................................ ................................ .....714.04 High -Strength Structural Bolts and Assemblies, 120 ksi ................................ ........... 714.05 Concrete Curing Materials ................................ ................................ ......................... 725.01 Air-Entraining Admixtures ................................ ................................ ........................ 725.02(b) Retarding Admixtures ................................ ................................ ................................ 725.02(c) Water -Reducing Admixtures ................................ ................................ ..................... 725.02(e) Water -Reducing and Retarding Admixtures ................................ .............................. 725.02(f) Water -Reducing, High Range Admixtures ................................ ................................ 725.02(g) Water -Reducing, High Range, and Retarding Admixtures ................................ .......725.02(h) Accelerating Admix tures ................................ ................................ ........................... 725.02(i) Water -Reducing and Accelerating Admixtures ................................ ......................... 725.02(j) Specific Performance Admixtures ................................ ................................ ............. 725.02(k) Mineral Admixtures ................................ ................................ ................................ ...725.03 Polystyrene Insulation Board ................................ ................................ ..................... 735.01 Blanket Insulation Material ................................ ................................ ........................ 735.02 Pipe Insulation ................................ ................................ ................................ ........... 740.0 6 Water ................................ ................................ ................................ .......................... 745.01 Concrete Repair Material , Type I ................................ ................................ .............. 780.0 1(a) Bearing pads for structures shall meet the requirements of Section 731 .
Source: Vermont Standard Specifications for Construction, 2024 Edition. Pages 551–554 of 1,380.