ASTM C935-80(1995)
(Specification)Standard Specification for General Requirements for Prestressed Concrete Poles Statically Cast
Standard Specification for General Requirements for Prestressed Concrete Poles Statically Cast
SCOPE
1.1 This specification covers general requirements for prestressed concrete poles statically cast for use as structural supports for lights, distribution, transmission, and dead end poles.
General Information
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Standards Content (Sample)
NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: C 935 – 80 (Reapproved 1995)
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
General Requirements for Prestressed Concrete Poles
Statically Cast
This standard is issued under the fixed designation C 935; the number immediately following the 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope C 172 Practice for Sampling Freshly Mixed Concrete
C 173 Test Method for Air Content of Freshly Mixed
1.1 This specification covers general requirements for pre-
Concrete by the Volumetric Method
stressed concrete poles statically cast for use as structural
C 231 Test Method for Air Content of Freshly Mixed
supports for lights, distribution, transmission, and dead end
Concrete by the Pressure Method
poles.
C 260 Specification for Air-Entraining Admixtures for Con-
1.2 The values stated in inch-pound units are to be regarded
crete
as the standard. The values given in parentheses are for
C 309 Specification for Liquid Membrane-Forming Com-
information only.
pounds for Curing Concrete
C 330 Specification for Lightweight Aggregates for Struc-
2. Referenced Documents
tural Concrete
2.1 ASTM Standards:
2 C 403 Test Method for Time of Setting of Concrete Mix-
A 36/A36M Specification for Structural Steel
tures by Penetration Resistance
A 82 Specification for Steel Wire, Plain, for Concrete Re-
2 C 494 Specification for Chemical Admixtures for Concrete
inforcement
C 595/C595M Specification for Blended Hydraulic Ce-
A 370 Test Methods and Definitions for Mechanical Testing
3 ments
of Steel Products
C 618 Specification for Fly Ash and Raw or Calcined
A 416/A416M Specification for Steel Strand Uncoated
2 Natural Pozzolan for Use as a Mineral Admixture in
Seven-Wire for Prestressed Concrete
Portland Cement Concrete
A 421 Specification for Uncoated Stress-Relieved Steel
Wire for Prestressed Concrete
3. Basis of Acceptance
A 586 Specification for Zinc-Coated Parallel and Helical
3.1 Acceptability of prestressed concrete poles produced in
Steel Wire Structural Strand
accordance with this specification shall be determined by the
A 615/A615M Specification for Deformed and Plain Billet-
results of compressive strength tests of concrete cylinders and
Steel Bars for Concrete Reinforcement
mill certificates for the reinforcing steel. A written statement,
A 722 Specification for Uncoated High-Strength Steel Bar
signed by the manufacturer, shall verify that the cement,
for Prestressing Concrete
aggregates, admixtures, and steel conform to the applicable
C 31 Practice for Making and Curing Concrete Test Speci-
specifications for the material and that the preparation of
mens in the Field
equipment, mixing, conveying, placing, consolidation, and
C 33 Specification for Concrete Aggregates
curing conforms to the requirements of the applicable standard
C 39 Test Method for Compressive Strength of Cylindrical
specifications. Concrete strength shall be determined by the
Concrete Specimens
compressive strength tests of cylinders. The manufacturer’s
C 42 Test Method for Obtaining and Testing Drilled Cores
statement shall also certify adherence to tolerance on dimen-
and Sawed Beams of Concrete
sions. Acceptability of the concrete strength of completed
C 94 Specification for Ready-Mixed Concrete
prestressed concrete poles may also be determined by com-
C 150 Specification for Portland Cement
pression tests of concrete cores in accordance with Test
Method C 42.
This specification is under the jurisdiction of ASTM Committee C-27 on
4. Materials
Precast Concrete Products and is the direct responsibility of Subcommittee C27.20
4.1 Cement—Portland cement shall conform to the require-
on Architectural and Structural Products.
Current edition approved Nov. 6, 1980. Published January 1981. ments of Specification C 150 or shall be blended hydraulic
Annual Book of ASTM Standards, Vol 01.04.
cement conforming to the requirements of Types IS or IP
Annual Book of ASTM Standards, Vol 01.03.
Specification C 595.
Annual Book of ASTM Standards, Vol 01.06.
4.2 Aggregate—The concrete shall be made with fine and
Annual Book of ASTM Standards, Vol 04.02.
Annual Book of ASTM Standards, Vol 04.01. coarse aggregates that conform to Specification C 33 or C 330.
NOTICE:¬This¬standard¬has¬either¬been¬superseded¬and¬replaced¬by¬a¬new¬version¬or
discontinued.¬Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬
C 935
The nominal maximum size of the coarse aggregate shall not wire of soft-drawn stranded copper, not smaller than No. 6
1 3
exceed ⁄5 the minimum dimension of the member or ⁄4 of AWG (4 mm), shall be bonded with a suitable compression or
either the clear spacing between the reinforcing steel or the mechanical connector to the embedded ground wire, and shall
clear cover. extend from the pole surface 4 6 1 in. (100 6 30 mm). Unless
4.3 Water—Water used for curing, for washing aggregates, otherwise specified, grounding pigtails shall be located 3 ft (0.9
and for mixing concrete shall be free of oils, organic materials, m) from the top and 4 ft (1.2 m) from the butt. Provisions to
and other substances in amounts that may be deleterious to attach a ground wire to the surface of the pole must be specified
concrete or steel, and it shall not contain concentrations of by the purchaser. The type of fastener or provisions for
chloride ions in excess of 500 parts per million or sulfate ions fastening to be supplied by the pole manufacturer, the location,
in excess of 1000 parts per million. the spacing, and any electrical connection to the reinforcing
4.4 Admixtures—Air-entraining admixtures shall conform steel must be covered in the purchaser’s specifications.
to Specification C 260. Chemical admixtures shall conform to
6. Manufacture
Specification C 494. Fly ash or other pozzolanic admixtures
6.1 Mixture—The aggregates shall be sized, graded, propor-
shall conform to the requirements of Specification C 618.
tioned, and thoroughly mixed with proportions of cement and
Admixtures shall not contain chloride ions in quantities that
water that will produce a concrete mixture of quality such that
will cause the total chloride content of the concrete to exceed
the poles will conform to the test and design requirements of
0.06 %.
this specification. Concrete conforming to Specification C 94
4.5 Steel—Prestressing steel shall conform to Specifications
may be used.
A 416, A 421, A 586, or A 722. Auxiliary nontensioned rein-
6.2 Placing—Concrete should be placed in the forms as
forcement shall conform to Specification A 82 or A 615/
nearly as possible in its final position. Special care should be
A 615M. Base plates, anchor bolts, and top mount couplings
taken to fill all parts of the forms, and to place concrete under
shall conform to ASTM specifications designated on contract
and around all reinforcing steel. Reinforcement shall be ad-
drawings.
equately secured so as to remain in the proper position during
5. Requirements
the placing of the concrete. Tie wires, if used to fasten the
5.1 Poles shall be designed to carry all forces associated reinforcing steel, shall be bent down to provide the maximum
with prestressing, handling, storage, installation, loading, and protective cover of concrete over the wires.
other service conditions. Consideration shall be given to the 6.3 Curing—Poles shall be cured by one of the following
level of prestress forces both before and after losses. methods or combination thereof. They shall be cured so that the
5.2 Concrete—Concrete shall have a minimum design com- concrete will develop the required compressive strength. The
pressive strength of 5000 psi (37.5 MPa) at 28 days. temperature of the concrete shall not exceed 100°F (38°C) nor
5.3 Concrete Cover—The minimum concrete cover over the drop below 40°F (4°C) for a minimum of 1 h after placing
reinforcement shall be 1 in. (25 mm). Ends of prestressed steel regardless of the curing option selected.
shall be recessed ⁄4 in. (6 mm) and shall be covered with a 6.3.1 Accelerated Curing—Poles may be cured with either
suitable waterproofing product. steam or radiant heat in a moist environment.
5.4 Air Entrainment—Unless otherwise specified by the 6.3.2 Water Curing—Poles may be water-cured by covering
purchaser, all concrete shall have an air content of 5 % plus or with water-saturated material or by a system of perforated
minus 1 % as measured by Test Method C 173 or C 231. pipes.
5.5 Lifting Devices—Flush inserts may be cast into the pole 6.3.3 Membrane Curing—A curing compound conforming
at locations agreeable to the purchaser. Removable attachments to the requirements of Specification C 309 may be applied and
may utilize the flush inserts to provide for lifting of the pole. should be left intact until strength requirements are met. The
Steel strand loops may be used instead of flush inserts for concrete at the time of application shall be within 10°F (6°C)
lifting. The loops shall be installed with a recess in the pole the of the ambient air temperature. All surfaces shall be kept moist
depth of the required minimum concrete cover over the prior to the application of the compounds and shall be damp
reinforcement, and a diameter no less than 1 ⁄4 in. (32 mm). when the compound is applied.
Steel strand lifting loops shall be rem
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