1、Designation:D 995 95b(Reapproved 2002)Standard Specification forMixing Plants for Hot-Mixed,Hot-Laid Bituminous PavingMixtures1This standard is issued under the fixed designation D 995;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,
2、the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1.Scope1.1 This specification covers req
3、uirements for plants suit-able for producing hot-mixed,hot-laid bituminous pavingmixtures.1.2 The values stated in inch-pound units are to be regardedas the standard.2.Referenced Documents2.1 ASTM Standards:C 136 Test Method for Sieve Analysis of Fine and CoarseAggregates2D 8 Terminology Relating to
4、 Materials for Roads and Pave-ments3D 140 Practice for Sampling Bituminous Materials33.Terminology3.1 For definitions of terms see Terminology D 8.3.2 Definitions of Terms Specific to This Standard:3.2.1 batch plant,na manufacturing facility for producingbituminous paving mixtures that proportions t
5、he aggregate andbituminous constituents into the mix by weighed batches,addsbituminous material by either weight or volume,and mixes theblend.3.2.2 continuous mix plant,na manufacturing facility forproducing bituminous paving mixtures that continuously pro-portions the aggregate and bituminous const
6、ituents into the mixby a continuous volumetric proportioning system withoutdefinite batch intervals.3.2.3 drum mix plant,na manufacturing facility for pro-ducing bituminous paving mixtures that continuously propor-tions aggregates,heats and dries them in a rotating drum,andsimultaneously mixes them
7、with a controlled amount ofbituminous material.The same plant may produce cold-mixedbituminous paving mixtures without heating and drying theaggregates.4.Requirements for All Plants4.1 UniformityThe plant shall be capable of uniformlycombining and mixing various sizes of aggregate from stock-piles,r
8、eclaimed asphalt pavement,if required,and bituminousmaterial.4.2 Equipment for Preparation of Bituminous Material:4.2.1 Tanks for storage of bituminous material shall beequipped for heating the material,under effective and positivecontrol at all times,to the temperature required in the pavingmixture
9、 specifications.Heating shall be by steam or oil coils,electricity,or other means such that no flame shall contact theheating tank.4.2.2 The circulating system for the bituminous materialshall be of adequate capacity to provide proper and continuouscirculation between storage tank and proportioning
10、units dur-ing the entire operating period.4.2.2.1 The discharge end of the bituminous material circu-lating pipe shall be kept below the surface of the bituminousmaterial in the storage tank to prevent discharging the hotbituminous material into the open air.4.2.2.2 All pipe lines and fittings shall
11、 be steam or oil-jacketed or otherwise properly insulated to prevent heat loss.When the bituminous material is emulsified asphalt,provisionsshould be made in the bitumen transfer system that will enablethe operator to turn off or reduce the heat media from all lines,pumps,and jacketed bituminous mat
12、erial buckets as soon asthe system is open and circulating properly.4.2.3 Storage tank capacity shall be such as to ensurecontinuous operation of the plant and uniform temperature ofthe bituminous material when it is introduced into the aggre-gate.Tanks shall be calibrated accurately to 100-gal(378.
13、5-L)intervals and shall be accessible for measuring the volume ofbituminous material at any time.4.2.4 A sampling tap,complying with the requirements ofPractice D 140,shall be provided in the bituminous materialfeed lines connecting the storage tanks to the bituminouscontrol unit.4.2.5 When filled o
14、r native bituminous materials are used,means shall be provided for agitation to maintain a uniformproduct.1This specification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.23 onPlant-Mixed Bituminous Surfaces and Base
15、s.Current edition approved Sept.10,1995.Published November 1995.Originallypublished as D 995 48 T.Last previous edition D 995 95a.2Annual Book of ASTM Standards,Vol 04.02.3Annual Book of ASTM Standards,Vol 04.03.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 194
16、28-2959,United States.4.3 Mineral FillerAdequate dry storage shall be providedfor mineral filler,when required,and provision shall be madefor accurate proportioning.4.4 Cold Aggregate FeederThe plant shall be providedwith mechanical means for uniformly feeding the aggregatesinto the dryer so that uniform production and temperature maybe assured.When aggregates must be blended from two ormore bins at the cold feed to meet the requirements of thepaving mixture specifications,a synchronized proport
