Specifications - City of Montpelier, Vermont

Title:Montpelier District HeatingCity of Montpelier, VT03050 – Concrete and Utility StructuresIssue Date:September 28, 2012Page #:5 of 85. Brick or masonry used to build any walls or provided for infill of pipeopenings shall conform to ASTM C150.6. The minimum 28day cure strength for precast and castinplace structuresshall be 5,000 psi.7. Structures shall not be backfilled until the concrete has reached a minimumstrength of 3,500 psi.8. Structures shall not be subject to any form of traffic or construction loadinguntil the concrete has reached the 28day cure strength of 5,000 psi.D. Manhole Steps: Where noted in the Plan details, manhole steps shall be cast inplace or drilled and epoxy grouted steps at 16" on center complying with OSHA1910.27. Steps 1/2" diameter grade 60 steel reinforcing with copolymerpolypropylene plastic encapsulation conforming to ASTM C478, as manufacturedby M.A. Industries Inc. or approved equal.E. City of Montpelier Structures: Manhole and catch basin structures that need to bereplaced in the process of performing installation work shall be replaced inkindin accordance with the City of Montpelier Department of Public Works, DesignStandards for Road and Utility Construction.F. Standpipes: Unless noted otherwise in the Plans or Project Manual, theCONTRACTOR shall be responsible for furnishing and installing standpipes tofinal roadway grade. All standpipes shall be Schedule 80 PVC or equal asapproved by the OWNER.G. Castings & Adjusting Rings: Unless noted otherwise in the Project Manual, theCONTRACTOR shall be responsible for furnishing and installing all castings andadjustment rings necessary to bring the castings to final roadway grade. Castingtypes are noted in the Plan details. All adjusting rings shall be sized appropriatelyfor the castings specified.H. Sealing & Waterproofing: For all structures, the CONTRACTOR shall berequired to complete sealing of the structure, pipe “knockouts”, and any jointsusing the following approved materials:1. Mortar Mix: One part Type 1, ASTM C150, cement by volume and three (3)parts clean, sharp sand by volume.2. NonShrink Grout: Pour Rok ® , Embeco ® 636, or approved equal.3. Water Sealing Material: SikaSet ® Plug, or approved equal.4. Joint Sealing Material: All precast concrete joints shall be sealed with a butylrubber joint seal, “Oring”, or ramneck installed to ensure a waterproof sealalong the entire length of a joint.CONCRETE AND UTILITY STRUCTURES030505