Specifications - City of Montpelier, Vermont

Montpelier District HeatingCity of Montpelier, VTIssue Date:September 28, 2012Title:02550 – CurbingPage #:9 of 13The tops and bottoms shall be not under the square more than 4 inches (100 mm), or overthe square at the back more than 1 inch (25 mm), when so tested.The exposed face shall be smooth quarry split or sawed. Drill holes will be permitted onthe exposed face, but only along the bottom edge and then to extend upward from theedge not over 3 inches (75 mm). The exposed face shall have no projections ordepressions greater than 1 inch (25 mm), measured from a 24 inch (600 mm) longstraightedge placed as closely as possible on any part of the face.The ends of all edging stones shall be square with the plane of the exposed face and sofinished that when the stones are placed end to end as closely as possible, no space morethan 1 inch (25 mm) shall show in the joint for the full depth of the face. The arris lines atthe ends shall be pitched with no variation from the plane of the face more than 1/4 inch(5 mm).2.17 PRECAST REINFORCED CONCRETE CURB:Precast reinforced concrete curb shall be solid, precast, reinforced units of uniform quality andappearance. All curb shall be cast in steel or concrete forms which will produce a satisfactorysurface requiring no further finishing, rubbing, or patching after the forms are removed, exceptfor the removal of flash or excess material along the edges.The precast curb shall conform to the following requirements:A. Dimensions: The individual precast curb units shall be of the dimensions shown on thePlans and shall be cast in lengths of not less than 3 feet (1 m) or greater than 10 feet (3m). Random lengths of curb of not less than 3 feet (1 m) in length may be obtained bysawing regular precast curb, if the Engineer determines it is necessary to meet fieldconditions. All curbs to be set on a radius of 160 feet (50 m) or less shall be precast to fitthe curve as required.B. Marking: Each pour shall be identified with a registration number cast in the curbshowing the name or trademark of the manufacturer and the manufacturer’s date ofmanufacture by a six digit number indicating in order the year, month, and day of month.A pour shall be considered as one day’s production.C. Materials: The concrete shall conform to the requirements of Vermont Agency ofTransportation Standard Specifications for Construction Section 540, and when sampledand tested in accordance with AASHTO T 22, shall have a minimum compressivestrength of 5000 psi (35 MPa). The manufacturer shall obtain a minimum of one core perpour for testing purposes. The core specimens shall be taken horizontally below theexposed face. The core holes shall be backfilled with Type I mortar conforming to therequirements previously noted. Bar reinforcement shall be Grade 60 (Grade 420)conforming to AASHTO M 31 M/M 31.CURBING 02550 9