9-24 Section 903. Admixtures and Curing Materials for Concrete
903.01 Air-Entraining Admixtures
Select liquid air-entraining admixtures for Portland cement concrete from the Qualified Products List.
903.02 Liquid Chemical Admixtures
Select liquid chemical admixtures for use in Portland cement concrete from the Qualified Products List . Liquid chemical admixtures must not contain a chloride ion content greater than 0.5% by weight. The Department uses the following ASTM C494/C494M terms for chemical admixtures: Table 903- 1: ASTM C494/C494M Terms for Chemical Admixtures Type Term A Water -reducing admixtures C Accelerating admixtures D Water -reducing and - retarding admixtures E Water -reducing and - accelerating admixtures F Water -reducing, high- range admixtures G Water -reducing, high- range, and - retarding admix tures The Department refers to water -reducing and mid-range admixtures not included in ASTM C494/C494M as Type MR.
903.03 Latex Admixtures
Formulated latex admixture for mo difying mortar or concrete mixtures must be a non-toxic, film forming, polymeric emulsion to which all stabilizers are added at the point of manufacture. Latex admixtures must be homogeneous and uniform in composition.
A.Physical Properties. White latex styrene butadiene modifier must have between 46.0 and 49.0 % solids ; pH, as shipped, between 8.5 and 11.0; and a shelf life of at least 2 years.
B.Storage . Protect latex admixtures from freezing. Do not expose latex admixtures to temperatures greater than 85°F for more than 10 days. MDOT Standard Specifications for Construction Section 903 9-25 903.04. Calcium Chl oride Concrete Accelerators Do not use calcium chloride in prestressed concrete, superstructure concrete, concrete for bridge railings, or concrete containing galvanized steel or aluminum. Flake or pellet calcium chloride for on-the-job preparation of admi xture solutions must meet the requirements of ASTM D98 for 77% grade or 94% grade. Determine the percent age of calcium and magnesium chlorides in accordance with ASTM D345. Provide flake or pellet Type S (solid) material. Calcium chloride admixture, delivered to the job in solution, must conform to the following chemical composition:
A.From 32.0 to 35.0 % calcium chloride (CaCl 2) anhydrous;
B.No greater than 1.0 % total magnesium as MgCl 2;
C.No greater than 2.0 % total alkali chlorides calculated as NaCl; and
D.No greater than 0.5% other impurities.
903.05 Polypropylene Fibers
Use 100% virgin polypropylene fibers, ¾ inch long, that meet the requirements of ASTM C1116 /C1116M , Type III.
903.06 Concrete Curing Materials for Pavement s
A.White Membrane Curing Compound . White membrane curing compound must meet the requirements of ASTM C309, Type 2, and be packaged in clean containers. Before use and before transferring the compound bet ween containers, agitate the compound to a uniform consistency and ensure that pigment is uniformly suspended.
B.Transparent Membrane Curing Compound for Base Course . Transparent membrane curing compound must meet the requirements of ASTM C309, Type 1-D, Class B with fugitive dye.
903.07 Concrete Curing Materials for Structures
A.White Membrane Curing Compound for Bridge Decks . Provide white -pigmented, modified, linseed- oil-based material that is either water soluble or an emulsion type that meets the requirements of ASTM C309, Type 2, except that the reflectance requirement and drying time do not apply. Compound must be packaged in clean containers. MDOT Standard Specifications for Construction Section 903 9-26 Before transferring the compound between containers and applying, agitate the compound to a uniform consistency and ensure uniform suspension of the pigment.
B.Transparent Membrane Curing Compound . Transparent membrane curing compound must meet the requirements of ASTM C309, Type 1- D, Class B, with fugitive dye.
C.Insulating Blankets. Insulating blankets must have vapor -retarding liners that completely enclose the insulating mat , are bonded to both sides of the insulati ng mat , and have one reflective face. Blankets must have thicknesses or R -values meeting the requirements of Table 706- 1. Insulating blanket must have a thermal conductivity (k) no greater than 0.27 BTU per hour per square foot temperature gradient of 1°F per inch of thickness at a mean temperature of 75°F when tested in accordance with ASTM C177.
D.Polystyrene Insulation . Expanded polystyrene m ust be cut from preformed material with an average cell diameter no greater than 0.04 inch and as specified in Table 903-2: Table 903- 2: Polystryene Insulation Specifications Property Specification Test Method Density ≥0.90 lb/ft³ ASTM C303 Compressive strength ≥9.0 psi ASTM D1621 Flexural strength ≥25.0 psi ASTM C203 Water absorption ≤2.0% by volume ASTM C272 /C272M Thermal conductivity ≤0.27 BTU/hr/ft²(a) ASTM C177
a.For a temperature gradient of 1°F per inch of thickness at a mean temperature of 75°F
Source: Michigan Standard Specifications for Construction, 2020 Edition. Pages 834–836 of 1,146.