ASTM C1903-24 预制混凝土管道组标准规范

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Designation: C1903 −24
Standard Speciﬁcation for
Precast Concrete Duct Bank
1
This standard is issued under the ﬁxed designation C1903; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope
1.1 This speciﬁcation includes the manufacturing require-
ments and installation guidelines of a precast duct bank system
including polyvinyl chloride (PVC) duct enclosed in a concrete
envelope. This speciﬁcation also includes information relating
to trenching, backﬁlling, plugging, and other incidentals nec-
essary for a complete installation.
1.2 The values stated in inch-pound units are to be regarded
as standard. The values given in parentheses are mathematical
conversions to SI units that are provided for information only
and are not considered standard.
1.3 This international standard was developed in accor-
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
2
A615/A615M Speciﬁcation for Deformed and Plain Carbon-
Steel Bars for Concrete Reinforcement
A706/A706M Speciﬁcation for Deformed and Plain Low-
Alloy Steel Bars for Concrete Reinforcement
A1064/A1064M Speciﬁcation for Carbon-Steel Wire and
Welded Wire Reinforcement, Plain and Deformed, for
Concrete
C31/C31M Practice for Making and Curing Concrete Test
Specimens in the Field
C33/C33M Speciﬁcation for Concrete Aggregates
C39/C39M Test Method for Compressive Strength of Cylin-
drical Concrete Specimens
C42/C42M Test Method for Obtaining and Testing Drilled
Cores and Sawed Beams of Concrete
C138/C138M Test Method for Density (Unit Weight), Yield,
and Air Content (Gravimetric) of Concrete
C143/C143M Test Method for Slump of Hydraulic-Cement
Concrete
C150/C150M Speciﬁcation for Portland Cement
C231/C231M Test Method for Air Content of Freshly Mixed
Concrete by the Pressure Method
C260/C260M Speciﬁcation for Air-Entraining Admixtures
for Concrete
C309 Speciﬁcation for Liquid Membrane-Forming Com-
pounds for Curing Concrete
C494/C494M Speciﬁcation for Chemical Admixtures for
Concrete
C595/C595M Speciﬁcation for Blended Hydraulic Cements
C618 Speciﬁcation for Coal Ash and Raw or Calcined
Natural Pozzolan for Use in Concrete
C805/C805M Test Method for Rebound Number of Hard-
ened Concrete
C822 Terminology Relating to Concrete Pipe and Related
Products
C979/C979M Speciﬁcation for Pigments for Integrally Col-
ored Concrete
C989/C989M Speciﬁcation for Slag Cement for Use in
Concrete and Mortars
C1017/C1017M Speciﬁcation for Chemical Admixtures for
Use in Producing Flowing Concrete (Withdrawn 2022)
3
C1064/C1064M Test Method for Temperature of Freshly
Mixed Hydraulic-Cement Concrete
C1116/C1116M Speciﬁcation for Fiber-Reinforced Concrete
C1157/C1157M Performance Speciﬁcation for Hydraulic
Cement
C1602/C1602M Speciﬁcation for Mixing Water Used in the
Production of Hydraulic Cement Concrete
C1609/C1609M Test Method for Flexural Performance of
Fiber-Reinforced Concrete (Using Beam With Third-Point
Loading)
C1611/C1611M Test Method for Slump Flow of Self-
Consolidating Concrete
C1619 Speciﬁcation for Elastomeric Seals for Joining Con-
crete Structures
1
This test method is under the jurisdiction of ASTM Committee C13 on
Concrete Pipe and is the direct responsibility of Subcommittee C13.01 on
Non-Reinforced Concrete Sewer, Drain and Irrigation Pipe.
Current edition approved Jan. 1, 2024. Published January 2024. Originally
approved in 2021. Last previous edition approved in 2021 as C1903–21. DOI:
10.1520/C1903-24
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
The last approved version of this historical standard is referenced on
www.astm.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1

C1812/C1812M Practice for Design of Journal Bearing Sup-
ports to be Used in Fiber Reinforced Concrete Beam Tests
D5334 Test Method for Determination of Thermal Conduc-
tivity of Soil and Rock by Thermal Needle Probe Proce-
dure
D7957/D7957M Speciﬁcation for Solid Round Glass Fiber
Reinforced Polymer Bars for Concrete Reinforcement
F477 Speciﬁcation for Elastomeric Seals (Gaskets) for Join-
ing Plastic Pipe
2.2 Other Standards:
NEMA TC-2 Standard for Electrical Polyvinyl Chloride
(PVC) Conduit
4
NEMA TC-6&8 Standard for Polyvinyl Chloride (PVC)
Plastic Utilities Duct for Underground Installations
4
NECA/NEMA 605 Standard for Installing Underground
Nonmetallic Utility Duct
4
UL 651 Standard for Schedule 40, 80, Type EB and A Rigid
PVC Conduit and Fittings
5
IEEE 442 Guide for Thermal Resistivity Measurements of
Soils and Backﬁll Materials
6
AASHTO LRFD Bridge Design Speciﬁcations
7
3. Terminology
3.1 Deﬁnitions—For deﬁnitions of terms relating to precast
concrete duct bank, see Terminology C822.
4. Basis of Acceptance
4.1 Acceptance on the Basis of Proof of Design Tests,
Material Tests, and Inspection of Manufactured Precast Duct
Bank Sections for Visual Defects and Imperfections—
Acceptability of precast duct bank sections shall be determined
by such material tests as are required in Section 5and Section
6; and by visual inspection of the ﬁnished sections to determine
conformance with the accepted design and its freedom from
defects in accordance with Section 10.
4.2 Thermal Resistance (Rho)—When required by project
speciﬁcations, Precast Duct Bank Sections shall be veriﬁed to
have a thermal resistivity (Rho) value no greater than speciﬁed
as tested in accordance with Test Method D5334 or IEEE 442.
Test to be completed at least annually or whenever concrete
mixture proportions or materials change.
4.3 Age for Acceptance—Precast duct bank sections shall be
considered ready for acceptance when it conforms to the
requirements as indicated by the speciﬁed tests, but not before
design strength has been met.
5. Materials
5.1 Cementitious Materials:
5.1.1 Cement—Cement shall conform to the requirements of
Speciﬁcation C150/C150M or C1157/C1157M, or shall be
blended cement conforming to the requirements of Speciﬁca-
tion C595/C595M.
5.1.2 Slag Cement—Slag cement shall conform to the re-
quirements of Speciﬁcation C989/C989M.
5.1.3 Fly Ash—Fly ash shall conform to the requirements of
Class F or Class C of Speciﬁcation C618.
5.2 Allowable Combinations of Cementitious Materials—
Any combination of cementitious materials shall be acceptable
for use in the concrete if the mix meets the testing requirements
of Section 9in this speciﬁcation.
5.3 Aggregates—Aggregates shall conform to Speciﬁcation
C33/C33M except that the requirement for gradation shall not
apply.
5.4 Admixtures—The following admixtures and blends are
acceptable:
5.4.1 Air-entraining admixture conforming to Speciﬁcation
C260/C260M;
5.4.2 Chemical admixture conforming to Speciﬁcation
C494/C494M;
5.4.3 Chemical admixture for use in producing ﬂowing
concrete conforming to Speciﬁcation C1017/C1017M; and
5.4.4 Chemical admixture or blend meeting requirements of
this standard.
5.5 Fibers—The use of ﬁber-reinforced concrete (FRC)
conforming to the requirements of Speciﬁcation C1116/
C1116M Type 1 (steel FRC), Type II (glass FRC), and Type III
(synthetic FRC) shall be permitted in precast duct bank
sections.
5.6 Integral Color—Concrete incorporated into precast duct
bank sections to be mixed with integral red color to indicate
electrical encasement shall meet the requirements of Speciﬁ-
cation C979/C979M.
5.7 Water—Water used in the production of concrete shall
be potable, or non-potable water that meets the requirements of
Speciﬁcation C1602/C1602M.
5.8 Reinforcement—When required by manufacturer’s
design, reinforcement shall meet the requirements of Speciﬁ-
cation A615/A615M,A706/A706M,A1064/A1064M, or
D7957/D7957M.
NOTE 1—Typical manufacturing procedures do not require reinforce-
ment.
5.9 Conduit—Conduit cast into precast duct bank sections
shall be sized according to project requirements and meet all
material and dimensional requirements UL 651, TC-6 & 8
Schedule 40 or Type EB, except as modiﬁed below:
5.9.1 It shall be permissible to modify the bottom socket
dimension to match entrance dimension to allow for ﬁeld ﬁt of
precast sections.
5.9.2 Conduit with modiﬁed socket dimensions shall be
marked “Precast-EB” for use in precast concrete duct bank
sections built to the requirements of this speciﬁcation.
4
Available from National Electrical Manufacturers Association (NEMA), 1300
N. 17th St., Suite 900, Arlington, VA 22209, http://www.nema.org.
5
Available from Underwriters Laboratories (UL), UL Headquarters, 333 Pﬁng-
sten Road, Northbrook, IL, 60062, http://www.ul.com.
6
Available from Institute of Electrical and Electronics Engineers, Inc. (IEEE),
445 Hoes Ln., Piscataway, NJ 08854-4141, http://www.ieee.org.
7
Available from American Association of State Highway and Transportation
Officials (AASHTO), 444 N. Capitol St., NW, Suite 249, Washington, DC 20001,
http://www.transportation.org.
C1903 − 24
2

5.10 Gasket Material—When required by project
speciﬁcations, conduit gaskets shall meet the requirements of
Speciﬁcation C1619 Class E or Speciﬁcation F477.
6. Design
6.1 Precast duct bank sections shall be designed to meet
dead load and HL93 live load requirements in accordance with
AASHTO LRFD Bridge Design Speciﬁcations or project
speciﬁc requirements as speciﬁed by the owner at the time of
order.
6.2 Dimensions—Overall dimensions of precast duct bank
sections shall be designed to provide for the following:
6.2.1 Conduit Spacing:
6.2.1.1 From face of concrete to OD of conduit = 3 in. (76
mm) minimum. This requirement does not apply to bell
surfaces.
6.2.1.2 From OD of conduit to OD of adjacent conduit = 3
in. (76 mm) minimum. This requirement does not apply to bell
surfaces of adjacent conduit.
6.2.2 Length of Section—Laying length of a precast duct
bank section, as measured from face to face parallel to the
center axis of the section along a given edge, shall be as shown
on manufacturer’s product details with tolerances as deﬁned in
Section 10.
6.3 Material Strengths—The manufacturer shall deﬁne the
following to meet the design requirements of the precast duct
bank sections:
6.3.1 Minimum Handling Compressive Strength of the
Concrete—(f '
ci
) as required by the design, but shall not be less
than 2,000 psi (13.8 MPa) or as required by the handling
devices incorporated into the section. It is not prohibited to
determine initial handling strength of a precast duct bank
section through application of a properly correlated rebound
hammer in accordance with Test Method C805/C805M.
6.3.2 Minimum Compressive Strength of the Concrete at
Time of Delivery—(f '
c
) as required by the design, but shall not
be less than 4,000 psi (25.6 MPa), to be determined in
accordance with Test Method C39/C39M.
6.3.3 Minimum Reinforcement Yield Strength and Ultimate
Strength—(f
y
) and (f
u
), if required.
6.3.4 Minimum Elastic Modulus of Reinforcement—(E
s
), if
required.
6.3.5 Fiber—FRC shall provide a minimum average equiva-
lent strength ratio, R
e3
, of 30 % when tested in accordance with
Test Method C1609/C1609M, using the roller support system
described in Practice C1812/C1812M. Dosage shall be as
recommended by the manufacturer.
NOTE 2—An R
e3
value of 30 % is chosen to correspond to 0.18 %
minimum reinforcement ratio used in typical concrete design.
6.4 Product Details—Precast duct bank section documenta-
tion when required by owner/purchaser to deﬁne the following:
6.4.1 The concrete mix design, including all materials and
admixtures within the concrete matrix.
6.4.2 Area and locations of reinforcement in units of in.
2
/ft
(mm
2
/m), if required.
6.4.3 Volume of ﬁber reinforcement, if required, in units of
lb/yd
3
(kg/m
3
) or percent of volume of concrete.
6.4.4 Product dimensions and tolerances.
7. Joints
7.1 Conduit Shear Protection:
7.1.1 Precast duct bank system shall be designed,
manufactured, and installed to develop adequate support at the
ends of the precast sections to protect the conduit from
excessive shear loads induced by differential movement of
adjacent sections caused by design dead and live loads.
7.1.2 At a minimum, the installed system shall be of
sufficient strength to transfer a factored wheel load included in
AASHTO HL93 design from section to section without de-
ﬂecting conduit by more than 10 % of the inside diameter.
Determination of provided strength to be performed using
structural analysis in accordance with AASHTO LRFD
requirements, or by physical testing.
7.2 Conduit—Each individual conduit section cast integrally
into precast concrete duct bank shall meet the following:
7.2.1 End of conduit bell to be cast ﬂush with the end
mating surface of the concrete section.
7.2.2 End of spigot that will be inserted into the bell to
extend from the mating surface of the precast concrete duct
bank section a sufficient length to engage the bell as detailed in
the joint design provided by the manufacturer.
7.2.3 Joint to be provided with one of the following sealing
options as required by the project speciﬁcations:
7.2.3.1 Gasket Joint—Gasket joint shall be integral with bell
of conduit, installed in gasket groove on Spigot end of conduit,
or another conﬁguration that meets the requirements of Speci-
ﬁcation C1619 or F477. Gasket joint shall meet the pressure
test requirements of 9.7 of this standard.
7.2.3.2 Slip Joint—No gasket required. Maximum centered
annular space between bell and spigot to be no greater than
0.03 in. (0.8 mm).
7.2.3.3 Regardless of Joint type—minimum insertion length
of spigot into bell to be no less than
1
⁄
2
of the nominal conduit
inside diameter or that distance where the gasket is fully
engaged.
8. Manufacture
8.1 Mixture:
8.1.1 The aggregates shall be sized, graded, proportioned,
and mixed with such proportions of cementitious materials,
water, and admixtures, if any, to produce a thoroughly mixed
concrete of such quality that the precast duct bank will conform
to the test and design requirements of this speciﬁcation.
8.1.2 Cementitious materials shall be as speciﬁed in 5.2 and
shall be added to the mix in a proportion not less than 470
lb/yd
3
(280 kg/m
3
) unless mix designs with a lower cementi-
tious materials content demonstrate that the quality and per-
formance of the precast duct bank meet the requirements of this
speciﬁcation.
8.1.3 For wetcast concrete, air content shall be as speciﬁed
on the manufacturer’s mix design and tested in accordance
with Test Method C231/C231M. If air content is not speciﬁed
on the mix design, target air content shall be 6 % (62 %).
8.1.4 For wetcast concrete, unit weight test shall be per-
formed in accordance with Test Method C138/C138M using
C1903 − 24
3

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ASTM C1903-24 Standard Specification for Precast Concrete Duct Bank 预制混凝土管道组标准规范

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