Specifications - City of Montpelier, Vermont

Montpelier District HeatingCity of Montpelier, VT02520 – Portland Cement Concrete PavingIssue Date:September 28, 2012Page #:4 of 104. Fractured Faces: When crushed gravel is used as coarse aggregate, at least 50percent, by weight, of the material coarser then the No. 4 sieve from each stockpileshall have at least one fractured face.5. Aggregate Failure: Coarse aggregate the fractures when used in a test cylinder, at astrength less than the minimum compressive strength of the class of concrete tested,may be cause for rejection of the coarse aggregate.6. Do not use fine or coarse aggregates that contain substances that cause spalling.D. Water: All water used shall be clear and free of harmful amounts of oil, salt, acids,alkalies, sugar, organic matter, or other substances injurious to the finished product,plant life, or the establishment of vegetation.2.4 ADMIXTURESA. Provide concrete admixtures that contain not more than 0.1 percent chloride ions.B. AirEntraining Admixture: AASHTO M 154, certified by manufacturer to be compatiblewith other required admixtures.C. WaterReducing Admixture: AASHTO M 194, Type A.D. HighRange WaterReducing Admixture: AASHTO M 194, Type F.E. WaterReducing and Accelerating Admixture: AASHTO M 194, Type E.F. WaterReducing and Retarding Admixture: AASHTO M 194, Type D2.5 CURING MATERIALSA. Absorptive Cover: Burlap cloth complying with AASHTO M 182, Class 2.B. MoistureRetaining Cover: One of the following, complying with ASTM C 171.1. White burlappolyethylene sheet.C. Clear SolventBorne Liquid MembraneForming Curing Compound: ASTM C 309,Type I, Class A or B, wax free.E. Evaporation Control: Monomolecular filmforming compound applied to exposedconcrete slab surfaces for temporary protection from rapid moisture loss.2.6 RELATED MATERIALSPORTLAND CEMENT CONCRETE PAVING 02520 4