Standard Specification for Mixing Plants for Hot-Mixed, Hot-Laid Bituminous Paving Mixtures

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Status
Historical
Publication Date
31-Dec-1994
Current Stage
Ref Project

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ASTM D995-95 - Standard Specification for Mixing Plants for Hot-Mixed, Hot-Laid Bituminous Paving Mixtures
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Standards Content (Sample)

ASTM D995 95 = 0759530 0556509 944
AMERICAN SOCIETY FOR TESTING AND MATERIALS
Designation: D 995 - 95
1916 RaceSt. Philadelphia, Pa 19103
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
li not listed in the current combined index, will appear in the nexi edition
Standard Specification for
Mixing Plants for Hot-Mixed, Hot-Laid Bituminous Paving
Mixtures’
This standard is issued under the fixed designation D 995; :he number immediately following :he designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (t) indicates an editorial change since the last revision or reapproval.
This specijication has been approved for use by agencies of the Department of Definse. Consult the DoD index of Specijkations and
Siandards for the specijic year of issue which has been adopted by the Department of Defense.
3.2.2.2 All pipe lines and fittings shall be steam or
1. Scope
oil-jacketed or otherwise properly insulated to prevent heat
1.1 This specification covers requirements for plants suit-
loss. When the bituminous material is emulsified asphalt,
able for producing hot-mixed, hot-laid bituminous paving
provisions should be made in the bitumen transfer system
mixtures.
that will enable the operator to turn off or reduce the heat
1.2 The values stated in inch-pound units are to be
media from all lines, pumps, and jacketed bituminous
regarded as the standard.
matenal buckets as soon as the system is open and circu-
lating properly.
3.2.3 Storage tank capacity shall be such as to ensure
2. Referenced Documents
continuous operation of the plant and uniform temperature
2.1 ASTM Standards:
of the bituminous material when it is introduced into the
C 136 Test Method for Sieve Analysis of Fine and Coarse
aggregate. Tanks shall be calibrated accurately to 100-gal
Aggregates’
(378.5-L) intervals and shall be accessible for measuring the
D8 Terminology Relating to Materials for Roads and
volume of bituminous material at any time.
Pavements3
3.2.4 A sampling tap, complying with the requirements of
D 140 Practice for Sampling Bituminous Materials3
Practice D 140, shall be provided in the bituminous matenal
feed lines connecting the storage tanks to the bituminous
control unit.
3. Requirements for All Plants
3.2.5 When filled or native bituminous materials are used,
3.1 Uniformity-The plant shall be capable of uniformly
means shall be provided for agitation to maintain a uniform
combining and mixing various sizes of aggregate from
product.
stockpiles, reclaimed asphalt pavement, if required, and
3.3 Mineral Filler-Adequate dry storage shall be pro-
bituminous material.
vided for mineral filler, when required, and provision shall
of Bituminous Material:
3.2 Equipment for Preparation
be made for accurate proportioning.
3.2.1 Tanks for storage of bituminous material shall be
3.4 Cold Aggregate Feeder-The plant shall be provided
equipped for heating the material, under effective and
with mechanical means for uniformly feeding the aggregates
positive control at all times, to the temperature required in
into the dryer so that uniform production and temperature
the paving mixture specifications. Heating shall be by steam
may be assured. When aggregates must be blended from two
or oil coils, electricity, or other means such that no flame
or more bins at the cold feed to meet the requirements of the
shall contact the heating tank.
paving mixture specifications, a synchronized proportioning
3.2.2 The circulating system for the bituminous material
method shall be provided.
shall be of adequate capacity to provide proper and contin-
3.4.1 If recycling capability is required, the plant shall be
uous circulation between storage tank and proportioning
equipped with mechanical means for feeding the desired
units during the entire operating period.
weight of reclaimed asphalt pavement into the mix. Facilities
3.2.2.1 The discharge end of the bituminous material
shall be provided for obtaining samples of the reclaimed
circulating pipe shall be kept below the surface of the
asphalt pavement.
bituminous matenal in the storage tank to prevent dis-
3.5 Dryer-A dryer of satisfactory design capable of
charging the hot bituminous material into the open air.
drying and heating the aggregate to the moisture and
temperature requirements of the paving mixture specifica-
tions shall be provided.
I This specification is under the jurisdiction of ASTM Committee D-4 on Road
3.6 Bituminous Control Unit:
and Paving Materials and is the direct responsibility of Subcommittee W4.23 on
Plant-Mix Bituminous Surfaces and Bases.
3.6.1 Satisfactory means, either by weighing or metering,
Current edition approved Feb. 15, 1995. Published April 1995. Originally
shall be provided to obtain the proper amount of bituminous
published as D 995
...

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