823CONCRETE CURING MATERIALS

823.01GENERAL. This section lists the various types of curing materials allowed for

concrete and the materials requirements applicable to each. The Department will provide specifications governing the particular type or types of curing materials allowed for specific classes of construction in the Contract or other sections of these specifications.

823.02LIQUID MEMBRANE FORMING COMPOUNDS. Products must have

completed testing through the National Transportation Product Evaluation Program

Department’s List of Approved Materials. Ensure that all curing compounds Conform to ASTM C309 and are from a Department approved manufacturer. 1) Type 1-D (Clear with fugitive dye or transl ucent with fugitive dye), Class A or Class B. 2) Type 2 (White pigmented), Class A or Class B. Supply Type 2 curing compounds in agitating type drums, except the Department will not require agitating type containers when Type 2 curing compound is supplied in 5 gallon pails.

The Department will accept curing compounds on the basis of certification of their conformance to this section and their being from an approved manufacturer. The Department will reject curing compounds from an unapproved manufacturer and require their removal from the project site.

.01 Acceptance Procedures for Non-Specification Curing Compounds. The

Department may test project samples. When non-specification curing compounds are inadvertently incorporated into the work the Department will accept the material with a reduction in pay. The Department will apply the largest payment reduction when the material fails to meet more than one specification requirement. The Department will calculate the payment reduction on the invoice cost of the material delivered at the project site.

MOISTURE LOSS PAYMENT REDUCTION kg/square meter 0.00-0.55 0. 56-0.65 0.66-0.75 0.76 or more Reduction Rate 0% 20% 30% 50%

REFLECTANCE PAYMENT REDUCTION % Reflectance 60.0% or more 50-59. 9% 40.0-49.9% 39.9% or less Reduction Rate 0% 20% 30% 50%

823.03BURLAP CLOTH. Conform to AASHTO M 182, Class 4

823.04CURING PAPER (Regular or White). Conform to ASTM C171

823.05WHITE POLYETHYLENE FILM (White Opaque). Use white polyethylene

film of either single sheet construction conforming to ASTM C171 or laminated construction consisting of 2 sheets of white polyethylene reinforced with synthetic fiber cords, providing the total thickness of polyethyl ene, exclusive of the cords, averages no less than 4 mils and the sheeting conforms to all other applicable requirements of ASTM C171. Incorporate the reinforcing cords diagonally in 2 directions and ensure that the number of cords averages 24 per linear foot in each direction.

823.06WHITE BURLAP - POLYETHYLENE SHEET. Conform to ASTM C171

823.07CURING BLANKETS. Use curing blankets that consist of a top layer of white

copolymer material and a bottom layer of absorbent, non-woven, synthetic fabric. Ensure that the layers are securely bonded together so there will be no separation of the layers during handling and curing of the concrete. When tested according to ASTM C171, ensure that moisture loss does not exceed 0.010grams per square centimeter and that reflectance is at least 70 percent.

SECTION 824 MASONRY MATERIALS

824.01CONCRETE MASONRY UNITS (FOR CONSTRUCTION OF CATCH

BASINS AND MANHOLES). Conform to ASTM C 139.

824.02PRECAST REINFORCED CONCRETE MANHOLE SECTIONS. Conform

to ASTM C 478, KM 64-115 and the Standard Drawings. For flat top slabs, a tongue and groove design is optional. The Department will allow the use of lightweight aggregate provided that it conforms to subsection 805.04.02.

824.03CONCRETE BUILDING BRICK. Conform to ASTM C 55

824.04CONCRETE FACING BRICK. Conform to ASTM C1634

824.05SEWER AND MANHOLE LEVELING BRICK. Conform to ASTM C32. The

Department will waive the requirement for saturation coefficient for Grades SM and MS. Ensure that the dimensions are of the specified standard size.

.01 Sewer Brick. Use Grade SS or SM

.02 Manhole Brick. Use Grade MS or MM

FINISHING HYDRATED LIME. Conform to ASTM C 206