6CONTROL OF MATERIALS

SECTION 6.00 : CONTROL OF MATERIALS Subsection 6.01 : Source of Supply and Quality The Engineer may approve material at the source of supply before delivery to the project. The Department reserves the right to require approval of the source of supply for any material to be incorporated into the work prior to delivery or manufacture. The Engineer reserves the right to prohibit the use of materials, products or components which , in the Engineer’s opinion , may be supplied in a manner not reasonably consistent with contract requirements. The determination of the Engineer shall be final upon all questions which pertain to supplier approval. Fabricators of structural steel, miscellaneous steel and aluminum products, and producers of precast concrete and prestressed concrete must be on the Department's approved fabricators list on the date the bids are opened. Only approved fabricators will be allowed to perform work for the Department. The Contractor shall furnish all materials required for the work specified in the Contract . Said materials shall meet the requirements of the specifications for the kind of work involving their use. For any materials named or described in these specifications, an approved equivalent to that named or described in the said specifications may be furn ished. Chapter 7, Section 22, Clause 17, of the General Laws, as amended, shall apply to the purchase by the Contractor of supplies and materials to be used in the execution of this Contract. The rules referred to require a preference in the purchase of supplies and materials, other considerations being equal, in favor first, of supplies and materials manufactured and sold within the Commonwealth, and second, of supplies and materials manufactu red and sold within the United States. All iron and steel products, manufactured products, and construction materials shall comply with all Federal Buy America and Federal Build America Buy America (BABA) requirements, where applicable. In Contracts requiring structural steel, precast, or prestress concrete, the Contractor shall furnish approved shop drawings, and fabrication procedures to the Department’s inspector at the supply source or fabrication site. Materials for permanent construction shall be new, shall conform to the requirements of these specifications, and shall be approved by the Engineer. Materials for temporary structures or supports adjacent to traveled ways, the failure of which would compromise the safety of the public or the traveled ways, need not be new but the Contractor shall be required to submit certification by a Structural Prof essional Engineer that the material meets the requirements for the intended use and shall be approved by the Engineer. Any fabrication shall conform to the requirements of these specifications. These requirements shall not apply to gantry systems and supports as well as other mechanized systems. II.289 202 4 Edition SECTION 500 : CURB AND EDGING SUBSECTION 501: CURB, CURB INLETS, CURB CORNERS AND E DGING DESCRIPTION

501.20: General

This item of work shall consist of furnishing and setting curb, curb inlets, curb corners and edging on a gravel foundation except for bridge curb which is set in full mortar bed and hot mix asphalt curb which is placed on a hot mix asphalt base, in accordance with these specifications and in close conformity with the lines and grades shown on the plans or established by the Engineer. MATERIALS

501.40: General

Materials shall conform to the requirements specified in the following Subsection of Division I II, Materials: Granite Curb ................................................................................................................................... M9.04.1 Granite Curb Inlets ...................................................................................................................... M9.04.5 Granite Curb Co rners ................................................................................................................. M9.04.6 Granite Edging .............................................................................................................................. M9.04.2 Mortar ............................................................................................................................................... M4.02.15 Gravel ................................................................................................................................................ M1.03.0, Type c Anchors ............................................................................................................................................ M8.01.0 Cement Concrete Precast Units .............................................................................................. M4.02.14 Joint Material Tar Paper ................................................................................................................................. M9.06.2 Preformed Expansion Joint Filler .................................................................................. M9.14.0 HMA for Driveways, Sidewalks, Berm and Curb ............................................................. M3.07.0 Cement Concrete .......................................................................................................................... M4.02.00 Liquid Concrete Penetrant/Sealer ........................................................................................ M9.15.0 CONSTRUCTION METHODS

501.60: Excavating Trench

The trench for the curb shall be excavated to a width of 18 in. The subgrade of the trench shall be a depth below the proposed finished grade of the curb equal to 6 in . plus the depth of the curbstone. Existing pavements shall be sawcut in accordance with the requirements of Subsection 482: Sawcutting as shown on the plans and as required by the Engineer.

501.61: Preparing Foundation

The foundation for the curb shall consist of gravel spread upon the subgrade and after being thoroughly compacted by tamping shall be 6 in . in depth. II.290 202 4 Edition The gravel foundation for edging shall be as shown on the plans and shall be thoroughly rammed or tamped until firm and unyielding. The foundation for the curb inlet shall consist of a full bed of Portland cement mortar on the supporting back wall of the catch basin or gutter inlet and sufficient gravel on each side to support the overhang. The trench for the gravel foundation shall be at least 6 in . in depth and 18 in . in width. This trench shall be filled with gravel thoroughly tamped to the required grade. The trench for the curb corner shall be excavated so that there shall be constructed a foundation of gravel which when thoroughly compacted will be 6 inches in depth, and extending 6 in . beyond the front and back of curb corner to the full depth of foundation. Other acceptable material may be used for backing.

501.62: Setting Curb and Edging

Curbing, curb corners or edging shall be set on additional gravel spread upon the foundation. All spaces under the curb, curb co rners or edging shall be filled with gravel thoroughly compacted so that the curb, curb corners or edging will be completely supported throughout their length. The curb shall be set at the line and grade required as shown on the plans. Curb, curb co rners or edging shall be fitted together as closely as possible except for VA5 curb which shall not fit closer to each other than ¼ in. If curb, curb corners, curb inlets or edging of different quarries is used on the same project, curbing of each particular quarry shall be segregated and set to give uniform appearance.

501.63: Concrete Curb, Corners, and Edging

The curb shall consist of con crete castings molded in place in sections 6 ft long, 24 in . in depth, 6 in. in width at the top, and 7 in . in width at the bottom and with front vertical face. The top front edge of curb shall be rounded to ¾- in. radius. The ends of curb sections shall be chamfered ¼ in. The edging shall consist of concrete castings conforming to the size and dimensions shown on plans. Straight edging shall be cast in lengths of 4 ft. Edging for curves with radii -300 ft or less shall be straight edging but shall be cast in lengths less than 4 ft in order to avoid angles at joints. The ends of all edging shall be normal to the line of face. The edges of edging face shall be chamfered ¼ in. Corners shall match the adjacent curb in size, color and finish. The front arris line shall extend through ¼ of a circle having a radius of 2 ft or 3 ft respectively for Type A or Type B curb comer. The back arris line shall be straight. The plan of the back shall be normal to the top. All forms shall be set true to lines and grades indicated on plans and as directed and held rigidly in proper position. They shall be either of metal or of acceptable planed and matched lumber of such construction that a smooth surface will be provided. Expansion joints shall be formed at the intervals shown on the plans using preformed expansion joint filler having a thickness of ½ in. When curb is constructed adjacent to or on concrete pavement, expansion joints hall be located opposite or at expansion joints in the pavement. II.291 202 4 Edition B. Mixing and Placing Concrete. The concrete shall be of such consistency and be so spaded and worked that a smooth mortar face will be produced.

set suffi ciently so that they can be removed without injury to the castings. Particular care will be required to prevent a ny discoloration of the exposed surface.

acceptable burlap o r other approved material and kept wet for 3 days or longer. Under extreme weather or other particu lar conditions proper curing shall be carried out as directed.

smooth and uniform surface, but no plastering will be allowed. For this work a competent and skillful finisher shall be employed.

M9.15.0: Liquid Penetrant/Sealant. After the concrete is at least 14 days old and after a 48 - hour minimum drying period (a longer period shall be required if castings do not appear dry) just prior to the time of treatment, the exposed surface shall be cleaned to remove all oil, grime and loose particles which would prevent the mixture from penetrating the concrete. immediately before the application of the mixture, an air blast shall be directed over the surface to be treated so that all dust will be removed. T he temperature of the concrete and air shall be 50°F or higher at the time of application. For rate of application see M4.02.14: Precast Units, Paragraph D. The second application of the surface treatment mixture shall not be made until the concrete, in the judgement of the Engineer, has regained its dry appearance. Traffic shall be prohibited from the area until the concrete has regained its dry appearance.

501.64: Hot Mix Asphalt Curb

The HMA mixture shall be placed and compacted with a machine acceptable and approved by the Engineer. The machine shall be capable of spreading the mixture true to line and grade and to the shape stipulated. The HMA curb shall be placed as shown in the current Department Standards. If at any time before the acceptance of the work any soft or imperfect spots develop in the exposed surface of the curb, such material placed shall be removed and replaced with new -material and compacted, without additional compensation.

501.65: Filling About Trench

After the curb, curb corners, curb inlets, and edging is set, the space between it and the wall of the trench shall be filled with gravel thoroughly tamped to the depth directed, care being taken not to affect the line or grade of the curb, curb co rners, curb inlets and edging. II.292 202 4 Edition 501.66 : Bridge Curb On bridges, after the concrete base has set and before the concrete in back of the curb is placed, Type VA5 curb shall be set to line and grade in full mortar beds and full mortar end joints with the anchors in the stone grouted in place. Each curb shall be brushed clean and free from loose particles, and thoroughly wetted with clean, fresh water before setting. The stone shall be carefully bedded in a full bed of mortar and in such a way as not to slide the stone on the mortar bed. Each stone shall be held securely in position by 2 steel anchors. The anchors shall be of the required dimensions and shapes and shall extend 3 in . into the curb and 6 in. into the concrete. Care shall be taken in placing the concrete in back of the curb to avoid disturbing the line or grade of the curb. Wherever plans indicate a construction joint in the sidewalk, or paraffin joint in coping, the curb shall be laid out so that a joint in the curb will be opposite the joint in the sidewalk, or coping.

501.67: Pointing

The joints between curbstones (both front and back) or edging shall be carefully filled with cement mortar and neatly pointed on the top and front exposed portions. After pointing, the curbstones or edging shall be satisfactorily cleaned of all excess mort ar that may have been forced out of the joints.

501.68: Transition Curb for Pedestrian Curb Ramps

Transitions from normal curb settings to pedestrian curb ramps shall be accomplished with transition curb as directed. Transitions shall be of the same type curb and similar to that abutting and, if on a curve, of the same radius. COMPENSATION

501.80: Method of Measurement

The length of curb (except hot mix asphalt curb) and edging shall be as measured along the front arris of the curb and edging, except that where the edging is set on a curve having a radius of 10 ft or less, the measurement will be made along the edging at the lowest exposed level after completion of shoulder or pavement. The quantity of hot mix asphalt curb to be paid for will be the length actually measured along curb at its lowest exposed edge. Each curb corner and curb inlet set, complete in place, will be considered one unit.

501.81: Basis of Payment

Curb or edging will be paid for at the contract unit price per foot, complete in place which shall include sawcuts made in existing pavement, cement concrete placed to set the curb or edging and all other work necessary to complete the installation. Curved granite curb shall include all curb (except curb corners), cut to specified radius and set on curve. II.293 202 4 Edition The steel anchors used with Type VA5 curb will be paid for under the Item for VA5 curb. Where granite edging is set on a curve having a radius of 10 ft or less the work will be paid for at the contract unit price per foot, complete in place, under the respective item for the particular type of edging required. Curb inlets will be paid for at the contract unit price each under the respective item for the particular type of inlet, either straight or cur ved, complete in place. All curb corners will be paid for at the contract unit price for each, under the item for the particular type of corner required, complete in place. The initial excavation, except Class A Rock Excavation, when done in conjunction with excavation for sub -base will be paid for under the appropriate excavation item. The price of the curbing will include compensation for any other required excavation. Gravel borrow for the foundations and backfilling will be paid for at the contract unit price per cubic yard under the item for Gravel Borrow. Rock excavation, if necessary, will be paid for at the contract unit price per cubic yard under the item for Class A Rock Excavation. II.294 202 4 Edition 501.82 : Payment Items 501. Granite Curb Type VA1 -Straight ............................................................................ Foot

501.1Granite Curb Type VA1 -Curved .............................................................................. Foot

502. Granite Curb Type VA2 -Straight ............................................................................ Foot

502.1Granite Curb Type VA2 -Curved .............................................................................. Foot

503. Granite Curb Type VA3 -Straight ............................................................................ Foot

503.1Granite Curb Type VA3 -Curved .............................................................................. Foot

504. Granite Curb Type VA4 -Straight ............................................................................ Foot

504.1Granite Curb Type VA4 -Curved .............................................................................. Foot

505. Granite Curb Type VA5 -Straight ............................................................................ Foot

505.1Granite Curb Type VA5 -Curved .............................................................................. Foot

506. Granite Curb Type VB -Straight ............................................................................... Foot

506.1Granite Curb Type VB -Curved ................................................................................ Foot

509. Granite Transition Curb for Pedestrian Curb Ramps -Straight .................. Foot

509.1Granite Transition Curb for Pedestrian Curb Ramps -Curved ................... Foot

510. Granite Edging Type SA ............................................................................................. Foot

510.1Granite Edging Type SA (Radius 10 Feet or less) ........................................... Foot

511.1Granite Edging Type SB -Straight ........................................................................... Foot

512.1Granite Edging Type SB (Radius 10 Feet or less) ........................................... Foot

513. Granite Edging Type SC ............................................................................................. Foot

513.1Granite Edging Type SC (Radius 10 Feet or less) ........................................... Foot

514. Granite Curb Inlet -Straight ...................................................................................... Each 515. Granite Curb Inlet -Curved ........................................................................................ Each 516. Granite Curb Corner Type A .................................................................................... Each 517. Granite Curb Corner Type B .................................................................................... Each 520. Concrete Curb Type VA ............................................................................................. Foot 521. Concrete Curb Corner Type A ................................................................................. Each

521.1Concrete Curb Corner Type B ................................................................................. Each

522. Concrete Edging Type SA .......................................................................................... Foot

570.1Hot Mix Asphalt Curb Type 1 .................................................................................. Foot

570.2Hot Mix Asphalt Curb Type 2 .................................................................................. Foot

570.3Hot Mix Asphalt Curb Type 3 .................................................................................. Foot

SUB