SECTION 903-AGGREGATES - Civil Engineering

1 903690 SECTION aggregate for aggregate for aggregate for for Lean Concrete for Mineral aggregate Base and Surface for Plant Mix Base and Leveling Courses (Hot Mix) for Bituminous Coated aggregate Base (Plant Mix). for Bituminous Road Mix Surface for Bituminous Sand-Gravel Binder and SurfaceCoarse (Hot Mix).. for Bituminous Plant Mix Surface Course (Cold Mix) for Asphaltic Concrete Surface Courses (Hot Mix).. for Slurry Seal and for Hot Bituminous Seal for Double Bituminous Surface for aggregate -Cement Base for for Sand-Asphalt Surface Aggregates for Structural of Coarse aggregate for Concrete. Fine aggregate for portland cementconcrete shall conform to the requirements of AASHTO M 6, with thefollowing exceptions and added stipulations.(a)The option regarding alternate freeze-thaw tests for soundnesswill not be exercised.

2 (b)The fine aggregate shall be washed in the processing operations.(c)Fine aggregate manufactured from limestone or dolomite shall beprocessed from material which has been scalped to remove quarryfines. The material from which the fine aggregate is processedshall have a percentage of wear, AASHTO T 96, of not more thanforty.(d)The amount of deleterious substances shall not exceed thefollowing limits:MaximumPermissibleLimits Per Centby and Passing the 75 m(No. 200) deleterious substances (suchas shale, alkali, mica,coated/grains, soft and flakyparticles) the fine aggregate is manufactured from limestone ordolomite and if the material finer than the 75 m (No. 200)sieve consists of the dust of fracture, essentially free from clayor shale, this limit may be increased to five per cent.

3 (e)Fine aggregate shall be well graded from coarse to fine and whentested by means of laboratory sieves, shall conform to thefollowing requirements:Total Per Cent PassingSieve Sizeby mm(3/8 inch) mm(No. 4) mm(No. 16)50-90300 m(No. 50)10-30150 m(No. 100)0-1075 m(No. 200)0-3 The limits for fine aggregate passing the 300 m (No. 50)sieve may be changed to 5-30% when used in air-entrained903692concrete mixes containing more than 235 kilograms (400 pounds)of cement per cubic meter (cubic yard) and for non air-entrainedconcrete mixes containing more than 295 kilograms per cubicmeter (500 pounds per cubic yard). Air-entrained concrete is hereconsidered to be concrete containing an air-entraining agent andhaving an air content of more than three percent.(f)Fine aggregate used in flowable mortar shall meet all the aboverequirements except the gradation shall be as follows:Total Per Cent PassingSieve Sizeby Weight19 mm (3/4 inch)10075 m (No.)

4 200) aggregate for Mortar. Mortar sand shall conform to therequirements of AASHTO M 45. Sand for mortar shall be uniformlygraded from coarse to fine within the following limits:Total Per Cent Passing,Sieve Sizeby mm( )100300 m( )15-40150 m( )0-1075 m( ) aggregate for Concrete. Coarse aggregate for any type orclass of portland cement concrete shall consist of crushed stone, crushedslag, or crushed or uncrushed gravel unless otherwise aggregate for portland cement concrete base and pavement shallbe furnished in two sizes: Size No. 4 and Size No. 67, as shown inSubsection The two sizes shall be manufactured, within thespecified limits, so as to produce Size No. 467, Subsection , whencombined in the proper proportions at the batching otherwise specified on the Plans, coarse aggregate for structuralconcrete shall be Size No.

5 57, Subsection aggregate for prestressed and precast concrete shall be Size or Size No. 67, Subsection , as may be specified or aggregate for concrete curbing placed by machine-extrusionmethods shall be Size No. 7, 57, 67 or 78, Subsection coarse aggregates shall otherwise conform to the requirements ofAASHTO M 80, with the following exceptions and stipulations:903693(a)Deleterious amount of deleterious substances shall not exceed thefollowing limits:MaximumPer Cent,by or non-durable fragments (fragmentswhich are structurally weak such as shale,soft sandstone, limonite concretions,gypsum, weathered schist orcemented gravel) and passing the 75 m(No. 200) or elongated pieces (length greaterthan 5 times averagethickness) local deleterious the case of crushed aggregate , if all the material finerthan the 75 m (200 mesh) sieve (AASHTO T 11) consists ofthe dust of fracture essentially free of clay or shale, Item 4,Maximum Per Cent by Weight, may be increased to Thesum of the percentages of Items No.

6 1, 2, 3, 4, and 6 shall notexceed (b)When the coarse aggregate is subjected to five alternations of thesodium sulfate soundness test (AASHTO T 104), the weightedpercentage of loss shall be not more than nine. Coarse aggregatefailing to meet the requirement for soundness may be accepted,provided it can be shown by evidence satisfactory to the Engineerthat concrete of comparable proportions made from the samesource has been exposed to weathering under conditions similar tothose occurring at the site of the structure for a period of at leastten years without appreciable option regarding alternate freeze-thaw tests forsoundness will not be percentage of wear as determined by AASHTO T 96shall not exceed 40.(c)Coarse aggregate for cement treated permeable base shall be SizeNo. 57 meeting the quality requirements for Lean Concrete Base.

7 aggregate for Lean ConcreteBase shall consist of crushed limestone, crushed slag, crushed or uncrushedgravel meeting the requirements of Subsection , for Class B,Grading D. The aggregate may be a "crusher or pit run" or may be sizedinto two or more sizes. If the material is "crusher or pit run", care shall betaken to prevent segregation during stockpiling and for Mineral aggregate Base and Surface for Mineral aggregate Base and Surface Courses shall becrushed stone, crushed slag, crushed or uncrushed gravel, or crushed oruncrushed chert, together with such material as manufactured sand orother fine materials naturally contained, or added thereto as needed toconform with these aggregate shall be of two classes: Class A and Class B.(a)Class A aggregate for mineral aggregate base and surface coursesshall consist of hard durable particles or fragments of stone, slag,gravel, or chert, and other finely divided mineral materials shall meet the requirements specified stone shall be free of silt and clay.

8 The coarseaggregate portion (retained on the mm (No. 4) sieve) ofthe stone shall have a percentage of wear of not more than 50,and when subjected to five alternations of the sodium sulfatesoundness test, the weighted percentage of loss shall notexceed slag shall be free of silt and clay and shall meet thequality requirements of crushed stone. It shall be reasonablyuniform in density and shall have a dry-rodded weight of atleast 112 kilograms per one tenth cubic meter (seventypounds per cubic foot). and chert shall be screened and all oversize materialmay be crushed and fed uniformly back over the screen. Thecoarse aggregate portion shall have a percentage of wear ofnot more than 50, and when subjected to five alternations ofthe sodium sulfate soundness test, the weighted percentage ofloss shall not exceed 15.

9 The portion of the material passingthe 425 m (No. 40) sieve shall be non-plastic, or shall have aliquid limit of not more than thirty and a plasticity index ofnot more than fine aggregate , coarse aggregate or binder, in addition tothat present in the base material, is necessary in order to meet thegradation or density requirements or for satisfactory bonding ofthe material, it shall be uniformly blended with the base coursematerial at the mixing plant by a mechanical feeder to maintain auniform flow on the belt to the mixer. Blending of materials onthe stockpiles or in the pits by bulldozer, clamshell, dragline orsimilar equipment will not be composite gradation of Class A aggregate shall be thegrading specified.(b)Class B aggregate for mineral aggregate base shall consist ofcrushed or uncrushed gravel, crushed or uncrushed chert, crushedstone or crushed slag, and other finely divided particles.

10 Thequality of Class B aggregate shall be the same as the qualityrequirements for Class A aggregate with the following exceptions:903695 The Sodium Sulfate Soundness shall not exceed 20. Class Baggregate shall be screened and the oversize materials may bewasted or crushed and returned over the screen and uniformlyblended with the other having a clay content greater than twelve per cent,as determined by hydrometer analysis (AASHTO T 88), will notbe permitted. Material having a clay content not exceeding twelveper cent will be acceptable provided a plasticity index-finesproduct does not exceed 3 when calculated by the followingformula:% Passing 425 m (No. 40) x of -425 m (40) Material 100If an excess of binder occurs, crushed stone, crushed slag,gravel, chert, sand, or other approved granular materials shall beuniformly incorporated in such proportions, not to exceed twentyper cent of the total mix, as the Engineer the quantity of binder is insufficient to bond the base orsurface course properly, additional binder of approved quality, inan amount not to exceed fifteen per cent of the total mix, shall beuniformly incorporated as directed by the use of material requiring the addition of coarse aggregateor binder in excess of the above limits will not be permitted,unless otherwise specified on the Plans or in the of additional material, if required, may beperformed either at the screening or mixing plant or on the blending is done at the plant.