820 Page 517820 COARSE AGGREGATE FOR USE IN PORTLAND CEMENT CONCRETE
820.1GENERAL REQUIREMENTS
A.Coarse Aggregate for Concrete Pavement: The coarse aggregate will consist of ledge rock. Coarse aggregate for continuously reinforced concrete pavement will conform to Size #20. Coarse aggregate for all other PCC pavements will conform to Size #1 or Size #15. B.Coarse Aggregate for Class A Concrete: The coarse aggregate will consist of ledge rock. Coarse aggregate for Class A concrete will conform to the gradation requirements of Size #1, Size #15, or Size #20 as indicated on the mix design. Size #20 will only be allowed when specified in the plans. C.Coarse Aggregate for Bridge Deck Resurfacing: The coarse aggregate will be produced from ledge rock. The coarse aggregate will conform to the gradation requirement of Size #3. D.Coarse Aggregate for Class M Concrete: Coarse aggregate for Class M concrete will meet the gradation requirements for Size #1. If Class M concrete is cast at a commercial precast facility regularly producing other precast items under Section 560, the coarse aggregate will conform to E.Coarse Aggregate for Prestressed and Precast Concrete : The coarse aggregate will be ledge rock. The aggregate size will be consistent throughout the entire structure. Only one source will be used to produce each aggregate size. Coarse aggregate for wet cast concrete will meet the gradation requirements of Size #1 or Size #1A as indicated on the mix design. The gradation requirement will not apply for dry cast concrete. F.Coarse Aggregate for Spall Repair and Extender Aggregate for Packaged Patching Mix Material including Dowel Bar Retrofit Patching Material: The coarse aggregate will be ledge rock. Coarse aggregate for spall repair, except the coarse aggregate used in a packed patching material, will meet the gradation requirements of Size #5. The gradation section does not apply to extender aggregate.
820.2SPECIFIC REQUIREMENTS
A.Deleterious Substances: The amount of deleterious substances will not exceed the following limits by dry weight: Clay lumps ..................................................................................................... 0.3% Shale and other materials having a specific gravity less than 1.95 ............... 1.0% Scratch hardness* .......................................................................................... 2.0% Other deleterious substances (such as alkali, mica, coated grains, flaky particles, coal, lignite, and chocolate rock*) ............. 2.0% *Not required for ledge rock The maximum amount of deleterious substances listed above will not exceed 2.0% by dry weight. The deleterious substances in the coarse aggregate for Class M concrete will not exceed the following limits: 820 Page 518Clay lumps ..................................................................................................... 0.5% Shale and other materials having a specific gravity less than 1.95 ............... 1.0% Scratch hardness* .......................................................................................... 2.0% Other deleterious materials (such as alkali, mica, coated grains, flaky particles, coal, lignite, and chocolate rock*) ............. 2.0% *Not required for ledge rock The maximum amount of all deleterious material will not exceed 3.0% by dry weight. B.Percentage of Wear: The percentage of wear, LA abrasion test, will not be more than 40% by weight. C.Soundness: When the coarse aggregate is subjected to 5 cycles of the sodium sulfate soundness test, the weighted loss will not exceed 10% by weight. When Class M coarse aggregate is subjected to 5 cycles of the sodium sulfate soundness test, the weighted loss will not exceed 12% by weight. . D.Gradation: Each size of coarse aggregate will conform to the gradation requirements specified in the following table: PERCENTAGE BY DRY WEIGHT PASSING SIEVE Size #Nominal Size Square Openings2 inch 1½ inch 1 inch ¾ inch ½ inch 3/8 inch #4 #8 1 1 inch to #8 100 95-100 25-60 0-10 0-5*1 1A 3/4 inch to #8 100 90-100 20-55 0-10 0-5*1 3 3/4 inch to #8 100 97-100 40-90 5-20 0-5*1 5 1/2 inch to #8 100 90-100 40-70 0-20 0-5*1 15 1½ inch to #8 100 95-100 70-90 27-53 2-20 0-6*1 20 2 inch to #8 100 97-100 66-85 45-70 15-40 1-20 0-5*1 *1The combined mixture of fine and coarse aggregate will be such that not more than 1.5% passes the #200 sieve. This limit will not be more than 2.5% for Class M concrete. E.Flat and Elongated Particles: The maximum amount of flat and elongated particles in the coarse aggregate of concrete pavement utilizing Size #15 or Size #20 will not exceed 10%. Flat and elongated particles are defined as those particles with a ratio of maximum to minimum dimension greater than 5:1 820 Page 519F.Sampling and Testing: Sampling .......................................................................................................... SD 201 Gradation ......................................................................................................... SD 202 Clay lumps .......................................................................................... AASHTO T 112 Particles Less Than 1.95 Specific Gravity ....................................................... SD 214 Scratch Hardness ............................................................................................ SD 218 Flat and Elongated Particles ............................................................................ SD 212 Chocolate Rock ................................................................................................ SD 216 LA Abrasion ..................................................................................................... SD 204 Soundness Test (sodium sulfate solution, five cycles) .................................... SD 220 Material Finer than #200 Sieve ........................................................................ SD 206 821 Page 520821 CONCRETE CURING MATERIALS
821.1REQUIREMENTS:
Curing materials will conform to the following requirements as specified: A.Curing Blankets: 1.Burlap Cloth made from Jute or Kenaf .......................................... AASHTO M 182 2.Non-woven Polypropylene Geotextile Fabric: White non-woven polypropylene geotextile fabric conforming to the following requirements may be used in lieu of burlap for horizontal applications only. This material is not to be used for curing vertical surfaces. Property Test Method UnitMinimum Average Roll Value Weight ASTM D 5261 ounces/square yard 8.0 B.Polyethylene Sheeting: White polyethylene sheeting will be durable to withstand the intended job use, without puncturing or tearing. During cool weather, the Engineer may permit the use of black polyethylene sheeting in lieu of white polyethylene sheeting. C.Liquid Membrane Forming Compounds for Curing Concrete: Curing compounds for concrete will be either white pigmented or linseed oil base emulsion unless one type is specifically required in the plans. 1.White Pigmented: The white pigmented compound will conform to the requirements of ASTM C309 Type 2. 2.Linseed Oil Base Emulsion: The linseed oil base emulsion compound will conform to the requirements of ASTM C309 Type 2, except as modified by the following: a.The compound will be a water emulsified linseed oil emulsion of 50% ±4% oil phase/50% ±4% water phase composition. (Linseed oil phase/water phase proportions will be formulated exclusive of added pigment.) The oil and water phase composition of linseed oil base emulsion will be tested in accordance with SD 509. b.Linseed oil used in the emulsion formulation will consist of a blend of 80% boiled linseed oil and 20% Z-8 viscosity linseed oil. c.The compound will be sprayable above 40ºF. 3.Storage: The compounds will be stored at temperatures above 35ºF. Compound stored for a period in excess of six months will require resampling and testing for compliance prior to use. 4.Sampling and Testing: The Department will test the liquid membrane forming compounds for water retention in accordance with AASHTO T 155 at an application rate of 1 gallon per 200 ft2.