SECTION 12 INDEX CONCRETE CURBS AND GUTTERS

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1 SECTION 12 INDEX CONCRETE CURBS AND GUTTERS 1. SCOPE OF WORK MATERIALS CONSTRUCTION REQUIREMENTS

2 SECTION 12 CONCRETE CURBS AND GUTTERS 1. SCOPE OF WORK: This work shall consist of the construction of portland cement concrete, edge curb or combined curb and gutters of the various types in accordance with these Specifications and in reasonably close conformity with the lines and grades shown on the Plans. 2. MATERIALS: Portland cement concrete materials shall conform to the requirements specified in the SECTION: CONCRETE. 3. CONSTRUCTION REQUIREMENTS: 3.1 When Portland Cement Concrete is Manufactured by a Commercial Ready-Mix Plant: The handling of cement and aggregates, composition, consistency, proportioning, batching, and mixing shall conform to the requirements specified in the SECTION: CONCRETE. 3.2 Composition, Consistency, Proportioning, Mixing: Unless otherwise indicated on the Plans, edge curb or combined curb and gutter of the various types shall be constructed of air-entrained concrete. The composition, consistency, proportioning, batching, mixing, and curing of concrete shall conform to the requirements of the SECTION: CONCRETE. Class B-1 concrete shall be used for all curbs, gutters and/or combined curb and gutters of the various types as constructed under this Specification. 3.3 Subgrade: The subgrade for combined curb and gutter shall be excavated to the grades and sections shown on the Plans. If the section is not indicated, the width to be excavated shall be twelve (12) inches each side of the outside edges of the curb or gutter. The subgrade shall be of uniform density. Rock, shale, or soft and yielding material shall be excavated six (6) inches below subgrade elevation and replaced with suitable backfill material. The backfill material shall be compacted to meet the requirements of compaction as specified in the SECTION: EARTHWORK. All subgrade shall be rolled or compacted to provide a smooth surface. 3.4 Forms: Forms for combined curb and gutter of the various types shall preferably be of steel but with the permission of the City, may be of wood for unusual sections or when small quantities are involved. All forms shall be sufficiently strong and rigid and securely staked and braced to obtain a finished product correct to the dimensions, line and grade required. Forms shall be cleaned and oiled before each use. 3.5 Reinforcement: All reinforcement shall be held in the position as indicated on the Plans, by pins, bar chairs, or other approved devices. The reinforcing steel shall conform to the requirements as set forth in this SECTION: CONCRETE. 12-2

3 3.6 Expansion, Contraction and Construction Joints: Expansion joints shall be placed at curb returns and/or at a maximum spacing of 150 feet for concrete edge curb and combined curb and gutter. Contraction joints shall be placed at a maximum spacing of 10 feet for edge curb and combined curb and gutter When constructed in connection with or abutting concrete pavement, the method of constructing the joints in curbs and/or gutters shall conform to the requirements for joints in the pavement When constructed separately from concrete pavement or in connection with flexible base or surface courses, contraction joints (planes of weakness) in the edge curbs and/or combined curb and gutter shall be formed by inserting a movable metal template in the fresh concrete, or by other methods approved by the City. After concrete has hardened the joint groove shall be cleaned, primed and sealed with a joint sealing compound. The joint sealer shall consist of a durable elastic compound capable of effectively sealing joints in concrete against the infiltration of moisture. It shall conform to the requirements of ASTM D (1970), together with the additional requirements and modifications contained within the Missouri State Highway Specifications Section The sealer shall be trim cut to the effective top elevation of the concrete joint and no material shall extrude above this level. 3.7 Curing Concrete Curbs and/or Gutters: Concrete edge curbs, gutters and/or combined curb and gutter shall be cured in accordance with the provisions for curing wearing surfaces in the SECTION: CONCRETE. 3.8 Backfilling: The area adjacent to edge curb and combined curb and gutter shall be backfilled with approved material to the top edges of the curbs and/or gutters or to the elevation shown on the Plans. The backfill shall be placed and compacted in accordance with the requirements of the SECTION: EARTHWORK. 3.9 Dowel Bars: The dowel bars which are located at expansion joints shall be smooth bars to the size, length and shape as shown on the Plans. The expansion joints shall be placed at curb return and/or at a maximum spacing of 150 feet Joint Filler: The expansion joint filler will be preformed joint filler conforming to ASTM Designation : D The preformed joint filler shall be resin-impregnated fiberboard conforming to the physical requirements of ASTM Designation: D After concrete has hardened the expansion joint filler shall be trimmed to ½ below the edge of the concrete curb and/or gutter, cleaned, primed and sealed with a joint sealing compound. The joint sealer shall consist of a durable elastic compound capable of effectively sealing joints in concrete against the infiltration of moisture. It shall conform to the requirements of ASTM D (1970), together with the additional requirements and 12-3

4 modifications contained within the Missouri State Highway Specifications Section The sealer shall be trim cut to the effective top elevation of the concrete joint and no material shall extrude above this level. 4. AASHTO REFERENCES 4.1 AASHTO M148 Liquid Membrane-Forming Compounds for Curing Concrete. 4.2 AASHTO M153 Standard Specification for Preformed Sponge Rubber and Cork Expansion Joint Fillers (ASTM D1752) for Concrete Paving and Structural Construction. 4.3 AASHTO M171 Sheet Materials for Curing Concrete. 4.4 AASHTO M182 Burlap Cloth Made from Jute or Kenef. 4.5 AASHTO M213 Standard Specification for Preformed Expansion Joint Fillers (ASTM D1751) for Concrete Paving and Structural Construction. 4.6 AASHTO M224 Protective Coatings for Portland Cement Concrete. 4.7 AASHTO M233 Boiled Linseed Oil Mixture for Treatment of Portland Cement Concrete. 5. ACI REFERENCES 5.1 ACI 305R Hot Weather Concreting. 5.2 ACI 306R Cold Weather Concreting. 6. ASTM REFERENCES 6.1 ASTM A185 Standard Specification for Steel Welded Wire Reinforcement, Plain, for Concrete Reinforcement. 6.2 ASTM A615 Standard Specification for Deformed and Plain Carbon- Steel Bars for Concrete Reinforcement (Including Supplementary Requirements S1). 6.3 ASTM C33 Standard Specification for Concrete Aggregates. 6.4 ASTM C150 Standard Specification for Portland Cement. 6.5 ASTM C174 Standard Test Method for Measuring Thickness of Concrete Elements Using Drilled Concrete Cores. 6.6 ASTM C309 Standard Specification Liquid Membrane-Forming Compounds for Curing Concrete. 6.7 ASTM D698 Standard Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12,400 ft-lbf/ft3). 6.8 ASTM D1751 Standard Specification for Preformed Expansion Joint Filler for Concrete Paving and Structural Construction (Nonextruding Bituminous Type). 6.9 ASTM D1752 Standard Specification for Preformed Sponge Rubber and Cork Preformed Expansion Joint Filler for Concrete Paving and Structural Construction. 12-4

5 6.10 ASTM D4253 Standard Test Methods for Maximum Index Density and Unit Weight of Soils Using a Vibratory Table ASTM D4254 Standard Test Methods for Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density. 7. FS REFERENCES 7.1 SS-S-1614 Sealants, Joint, Jet-Fuel-Resistant, Hot-Applied for Portland Cement and Tar Concrete Pavements. 7.2 TT-P-115 Paint, Traffic (Highway, White and Yellow). 7.3 TT-S 00227E(3) Sealing Compound: Elastomeric Type, Multi- Component (for Calking, Sealing, and Glazing in Buildings and Other Structures. END OF SECTION 12-5