ASTM C330/C330M-23

Standard Specification for Lightweight Aggregates for Structural Concrete

ABSTRACT
This specification covers lightweight aggregates intended for use in structural concrete in which prime considerations are reducing the density while maintaining the compressive strength of the concrete. Procedures covered in this specification are not intended for job control of concrete. Two general types of lightweight aggregates are covered by this specification: aggregates prepared by expanding, pelletizing, or sintering products such as blast-furnace slag, clay, diatomite, fly ash, shale, or slate; and aggregates prepared by processing natural materials, such as pumice, scoria, or tuff. The aggregates shall be composed predominately of lightweight-cellular and granular inorganic material. Lightweight aggregates shall be tested, and should not contain excessive amounts of deleterious substances; and should conform to the specified values of organic impurities, aggregate staining, aggregate loss of ignition, clay lumps and friable particles, loose bulk density, compressive strength, drying shrinkage, popouts, and resistance to freezing and thawing.
SCOPE
1.1 This specification covers lightweight aggregates intended for use in structural concrete in which prime considerations are reducing the density while maintaining the compressive strength of the concrete. Procedures covered in this specification are not intended for job control of concrete.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.2.1 With regard to other units of measure, the values stated in inch-pound units are to be regarded as standard.  
1.3 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
Note 1: This specification is regarded as adequate to ensure satisfactory lightweight aggregates for most concrete. It is recognized that it may be either more or less restrictive than needed for some conditions and for special purposes, such as fire resistance, fill, and concrete constructions, the use of which is based on load tests rather than conventional design procedures.  
1.4 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.

General Information

• Status: Published
• Publication Date: 31-May-2023
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.21 - Lightweight Aggregates and Concrete

Relations

• Refers: ASTM C31/C31M-24a - Standard Practice for Making and Curing Concrete Test Specimens in the Field
• Effective Date: 01-Apr-2024
• Refers: ASTM C31/C31M-24 - Standard Practice for Making and Curing Concrete Test Specimens in the Field
• Effective Date: 01-Jan-2024
• Refers: ASTM C151/C151M-23 - Standard Test Method for Autoclave Expansion of Hydraulic Cement
• Effective Date: 01-Dec-2023
• Refers: ASTM C39/C39M-23 - Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens
• Effective Date: 01-Dec-2023
• Refers: ASTM C142/C142M-17(2023) - Standard Test Method for Clay Lumps and Friable Particles in Aggregates
• Effective Date: 01-Oct-2023
• Refers: ASTM C29/C29M-23 - Standard Test Method for Bulk Density (“Unit Weight”) and Voids in Aggregate
• Effective Date: 01-Oct-2023
• Refers: ASTM C114-23 - Standard Test Methods for Chemical Analysis of Hydraulic Cement
• Effective Date: 01-Oct-2023
• Refers: ASTM C125-19a - Standard Terminology Relating to Concrete and Concrete Aggregates
• Effective Date: 15-Dec-2019
• Refers: ASTM D75/D75M-19 - Standard Practice for Sampling Aggregates
• Effective Date: 01-Nov-2019
• Refers: ASTM C125-19 - Standard Terminology Relating to Concrete and Concrete Aggregates
• Effective Date: 01-Jan-2019
• Refers: ASTM C125-18b - Standard Terminology Relating to Concrete and Concrete Aggregates
• Effective Date: 01-Oct-2018
• Refers: ASTM C125-18a - Standard Terminology Relating to Concrete and Concrete Aggregates
• Effective Date: 01-Jul-2018
• Refers: ASTM C151/C151M-18 - Standard Test Method for Autoclave Expansion of Hydraulic Cement
• Effective Date: 01-Apr-2018
• Refers: ASTM C125-18 - Standard Terminology Relating to Concrete and Concrete Aggregates
• Effective Date: 01-Jan-2018
• Refers: ASTM C31/C31M-18 - Standard Practice for Making and Curing Concrete Test Specimens in the Field
• Effective Date: 01-Jan-2018

Overview

ASTM C330/C330M-23: Standard Specification for Lightweight Aggregates for Structural Concrete defines the essential quality and performance requirements for lightweight aggregates used in structural concrete applications. The standard, published by ASTM International, aims to ensure that lightweight aggregates effectively reduce concrete density without sacrificing compressive strength. ASTM C330/C330M-23 addresses both manufactured and natural lightweight aggregates and prescribes key limits on deleterious materials, grading, density, strength, and durability. This standard is critical for producers, suppliers, and specifiers in the construction industry seeking compliance, quality, and consistency for lightweight structural concrete projects.

Key Topics

• Aggregate Types

  • Manufactured Aggregates: Created by expanding, pelletizing, or sintering materials like blast-furnace slag, clay, shale, slate, diatomite, and fly ash.
  • Natural Aggregates: Processed from naturally occurring lightweight materials such as pumice, scoria, and tuff.

• Material Requirements

  • Predominantly lightweight-cellular and granular inorganic composition.
  • Limits on organic impurities, iron staining, and loss on ignition to ensure aggregate quality.

• Physical and Mechanical Properties

  • Stringent controls on clay lumps, friable particles, and grading uniformity.
  • Maximum dry loose bulk density requirements for fine, coarse, and combined aggregates.
  • Minimum requirements for compressive strength, splitting tensile strength, density, and drying shrinkage.

• Durability and Testing

  • Resistance to freezing and thawing for durability in various environments.
  • No excessive popouts or volume changes under specified testing conditions.

• Measurement Systems

  • Both SI and inch-pound units are permitted, but not to be intermixed in a single application for conformity.

Applications

• Structural Concrete Construction
  ASTM C330/C330M-23 lightweight aggregates are widely used in:

  • High-rise buildings, load-bearing walls, and bridges, where reducing dead load is essential.
  • Precast and prestressed concrete members.
  • Projects requiring improved thermal insulation or fire resistance, where lighter weight without loss of strength is advantageous.

• Sustainability and Efficiency

  • Use of lightweight aggregates in concrete reduces material consumption, contributes to more energy-efficient structures, and eases transportation and handling.
  • Natural aggregates like pumice or industrial by-products like expanded shale support sustainable construction practices.

• Quality Control and Compliance

  • Aggregate producers and suppliers use ASTM C330/C330M-23 to certify products for acceptance testing.
  • Designers and contractors specify compliance with this standard to ensure structural integrity and performance in concrete works.

Related Standards

• ASTM C33/C33M: Specification for Concrete Aggregates
• ASTM C567/C567M: Test Method for Determining Density of Structural Lightweight Concrete
• ASTM C39/C39M: Test Method for Compressive Strength of Cylindrical Concrete Specimens
• ASTM C496/C496M: Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens
• ASTM C29/C29M: Test Method for Bulk Density (“Unit Weight”) and Voids in Aggregate
• ASTM D75/D75M: Practice for Sampling Aggregates

These referenced standards ensure that all aspects of lightweight aggregate production, testing, and application are covered, providing the construction industry with a comprehensive framework for quality and performance.

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Keywords: lightweight aggregates, structural concrete, ASTM C330/C330M-23, compressive strength, aggregate requirements, concrete density, construction materials specification, bulk density, lightweight aggregate testing, natural and manufactured aggregates.

Standards Content (Sample)

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.
Designation: C330/C330M − 23
Standard Specification for
Lightweight Aggregates for Structural Concrete
This standard is issued under the fixed designation C330/C330M; 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* C29/C29M Test Method for Bulk Density (“Unit Weight”)
and Voids in Aggregate
1.1 This specification covers lightweight aggregates in-
C31/C31M Practice for Making and Curing Concrete Test
tended for use in structural concrete in which prime consider-
Specimens in the Field
ations are reducing the density while maintaining the compres-
C33/C33M Specification for Concrete Aggregates
sive strength of the concrete. Procedures covered in this
C39/C39M Test Method for Compressive Strength of Cylin-
specification are not intended for job control of concrete.
drical Concrete Specimens
1.2 The values stated in either SI units or inch-pound units
C40/C40M Test Method for Organic Impurities in Fine
are to be regarded separately as standard. The values stated in
Aggregates for Concrete
each system may not be exact equivalents; therefore, each
C114 Test Methods for Chemical Analysis of Hydraulic
system shall be used independently of the other. Combining
Cement
values from the two systems may result in non-conformance
C125 Terminology Relating to Concrete and Concrete Ag-
with the standard.
gregates
1.2.1 With regard to other units of measure, the values
C127 Test Method for Relative Density (Specific Gravity)
stated in inch-pound units are to be regarded as standard.
and Absorption of Coarse Aggregate
1.3 The text of this specification references notes and
C128 Test Method for Relative Density (Specific Gravity)
footnotes which provide explanatory material. These notes and
and Absorption of Fine Aggregate
footnotes (excluding those in tables and figures) shall not be
C136/C136M Test Method for Sieve Analysis of Fine and
considered as requirements of the standard.
Coarse Aggregates
C142/C142M Test Method for Clay Lumps and Friable
NOTE 1—This specification is regarded as adequate to ensure satisfac-
tory lightweight aggregates for most concrete. It is recognized that it may
Particles in Aggregates
be either more or less restrictive than needed for some conditions and for
C151/C151M Test Method for Autoclave Expansion of Hy-
special purposes, such as fire resistance, fill, and concrete constructions,
draulic Cement
the use of which is based on load tests rather than conventional design
C157/C157M Test Method for Length Change of Hardened
procedures.
Hydraulic-Cement Mortar and Concrete
1.4 This international standard was developed in accor-
C192/C192M Practice for Making and Curing Concrete Test
dance with internationally recognized principles on standard-
Specimens in the Laboratory
ization established in the Decision on Principles for the
C496/C496M Test Method for Splitting Tensile Strength of
Development of International Standards, Guides and Recom-
Cylindrical Concrete Specimens
mendations issued by the World Trade Organization Technical
C567/C567M Test Method for Determining Density of
Barriers to Trade (TBT) Committee.
Structural Lightweight Concrete
C641 Test Method for Iron Staining Materials in Light-
2. Referenced Documents
weight Concrete Aggregates
2.1 ASTM Standards:
C666/C666M Test Method for Resistance of Concrete to
Rapid Freezing and Thawing
C702/C702M Practice for Reducing Samples of Aggregate
This specification is under the jurisdiction of ASTM Committee C09 on
to Testing Size
Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee
D75/D75M Practice for Sampling Aggregates
C09.21 on Lightweight Aggregates and Concrete.
Current edition approved June 1, 2023. Published July 2023. Originally approved
in 1953. Last previous edition approved in 2017 as C330/C330M–17a. DOI:
3. Terminology
10.1520/C0330_C0330M-23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.1 Definitions:
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3.1.1 For definitions of terms used in this specification, refer
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. to Terminology C125.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C330/C330M − 23
4. Aggregate Types 6.1.3 Uniformity of Grading—To ensure reasonable unifor-
mity in the grading of successive shipments of lightweight
4.1 Two general types of lightweight aggregates are covered
aggregate, fineness modulus shall be determined on samples
by this specification, as follows:
taken from shipments at intervals stipulated by the purchaser. If
4.1.1 Aggregates prepared by expanding, pelletizing, or
the fineness modulus of the aggregate in any shipment differs
sintering products such as blast-furnace slag, clay, diatomite,
by more than 7 % from that of the sample submitted for
fly ash, shale, or slate, and
acceptance tests, the aggregate in the shipment shall be
4.1.2 Aggregates prepared by processing natural materials,
rejected, unless the supplier demonstrates that it will produce
such as pumice, scoria, or tuff.
concrete of the required characteristics.
4.2 The aggregates shall be composed predominately of
6.1.4 Loose Bulk Density (Test Method C29/C29M)—The
lightweight-cellular and granular inorganic material.
dry loose bulk density of lightweight aggregates shall conform
to the requirements shown in Table 2 using a 14 L [ ⁄2 cubic
5. Chemical Composition
foot] measure.
5.1 Lightweight aggregates shall not contain excessive
6.1.5 Uniformity of Loose Bulk Density—The dry loose bulk
amounts of deleterious substances, as determined by the
density of lightweight aggregate shipments sampled and tested,
following limits:
shall not differ by more than 10 % from that of the sample
5.1.1 Organic Impurities (Test Method C40/C40M)—
submitted for acceptance tests, and shall not exceed the limits
Lightweight aggregates that, upon being subjected to test for
in Table 2.
organic impurities, produce a color darker than the standard
6.1.6 Relative Density—When specified, the relative density
shall be rejected, unless it is demonstrated that the discolor-
shall be determined in accordance with 9.10.
ation is due to small quantities of materials not harmful to the
concrete.
6.2 Concrete specimens containing lightweight aggregate
5.1.2 Staining (Test Method C641)—An aggregate produc-
under test shall meet the following requirements:
ing a stain index of 60 or higher shall be rejected when the
6.2.1 Compressive Strength (Test Method C39/C39M), Den-
deposited stain is found upon chemical analysis to contain an
sity (Test Method C567/C567M), and Splitting Tensile Strength
iron content, expressed as Fe O equal to or greater than 1.5
2 3
(Test Method C496/C496M)— Compressive strength and den-
mg/200 g of sample.
sity shall be an average of three specimens and the splitting
5.1.3 Loss on Ignition (Test Methods C114)—The loss on
tensile strength shall be the average of eight specimens. It shall
ignition of lightweight aggregates shall not exceed 5 %.
be possible to produce structural concrete using the lightweight
NOTE 2—Some aggregates may contain carbonates or water of hydra-
aggregates under test, so that from the same batch of concrete
tion that contribute to loss on ignition but may not affect the quality of the
one or more of the compressive strength requirements and
product. Therefore, when evaluating an aggregate, consideration should be
splitting tensile strength requirements in Table 3 will be
given to the material characteristics that cause the ignition loss.
satisfied without exceeding the corresponding maximum den-
sity values.
6. Physical Properties
6.1 Lightweight aggregate under test shall meet the follow-
NOTE 4—Intermediate values for strength and corresponding density
ing requirements: values shall be established by interpolation. Materials that do not meet the
minimum average splitting tensile strength requirement may be used
6.1.1 Clay Lumps and Friable Particles—The total amount
provided the design is modified to compensate for the lower value.
of clay lumps and friable particles shall not exceed 2 % by dry
mass.
6.2.2 Natural Aggregates— Natural aggregates, when used
6.1.2 Grading—The grading shall conform to the require-
to replace part, or all, of the lightweight-aggregates shall
ments shown in Table 1.
comply with the applicable requirements of Specification
C33/C33M. The test report shall record the proportion of all
NOTE 3—The surfaces of pyro-processed lightweight aggregate par-
ingredients and the characteristics of the natural aggregates to
ticles finer than 75 μm (No. 200) sieves are not deleterious and may be
moderately pozzolanic. ensure compliance with these minimum requirements.
TABLE 1 Grading Requirements for Lightweight Aggregate for Structural Concrete
Percentages (Mass) Passing Sieves Having Square Openings
Nominal Size Designation
25.0 mm 19.0 mm 12.5 mm 9.5 mm 4.75 mm 2.36 mm 1.18 mm 300 μm 150 μm 75 μm
3 1 3
(1 in.) ( ⁄4 in.) ( ⁄2 in.) ( ⁄8 in.) (No. 4) (No. 8) (No. 16) (No. 50) (No. 100) (No. 200)
Fine aggregate:
4.75 mm to 0 . . . 100 85–100 . 40–80 10–35 5
...

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C330/C330M − 17a C330/C330M − 23
Standard Specification for
Lightweight Aggregates for Structural Concrete
This standard is issued under the fixed designation C330/C330M; 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 covers lightweight aggregates intended for use in structural concrete in which prime considerations are
reducing the density while maintaining the compressive strength of the concrete. Procedures covered in this specification are not
intended for job control of concrete.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each
system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the
two systems may result in non-conformance with the standard.
1.2.1 With regard to other units of measure, the values stated in inch-pound units are to be regarded as standard.
1.3 The text of this standardspecification references notes and footnotes which provide explanatory material. These notes and
footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
NOTE 1—This specification is regarded as adequate to ensure satisfactory lightweight aggregates for most concrete. It is recognized that it may be either
more or less restrictive than needed for some conditions and for special purposes, such as fire resistance, fill, and concrete constructions, the use of which
is based on load tests rather than conventional design procedures.
1.4 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.
2. Referenced Documents
2.1 ASTM Standards:
C29/C29M Test Method for Bulk Density (“Unit Weight”) and Voids in Aggregate
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 Cylindrical Concrete Specimens
C40/C40M Test Method for Organic Impurities in Fine Aggregates for Concrete
C114 Test Methods for Chemical Analysis of Hydraulic Cement
C125 Terminology Relating to Concrete and Concrete Aggregates
C127 Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate
This specification is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.21 on
Lightweight Aggregates and Concrete.
Current edition approved June 15, 2017June 1, 2023. Published July 2017July 2023. Originally approved in 1953. Last previous edition approved in 2017 as
C330/C330M–17. DOI: 10.1520/C0330_C0330M-17A.–17a. DOI: 10.1520/C0330_C0330M-23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C330/C330M − 23
C128 Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate
C136/C136M Test Method for Sieve Analysis of Fine and Coarse Aggregates
C142/C142M Test Method for Clay Lumps and Friable Particles in Aggregates
C151/C151M Test Method for Autoclave Expansion of Hydraulic Cement
C157/C157M Test Method for Length Change of Hardened Hydraulic-Cement Mortar and Concrete
C192/C192M Practice for Making and Curing Concrete Test Specimens in the Laboratory
C496/C496M Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens
C567/C567M Test Method for Determining Density of Structural Lightweight Concrete
C641 Test Method for Iron Staining Materials in Lightweight Concrete Aggregates
C666/C666M Test Method for Resistance of Concrete to Rapid Freezing and Thawing
C702/C702M Practice for Reducing Samples of Aggregate to Testing Size
D75/D75M Practice for Sampling Aggregates
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this specification, refer to Terminology C125.
4. Aggregate Types
4.1 Two general types of lightweight aggregates are covered by this specification, as follows:
4.1.1 Aggregates prepared by expanding, pelletizing, or sintering products such as blast-furnace slag, clay, diatomite, fly ash,
shale, or slate, and
4.1.2 Aggregates prepared by processing natural materials, such as pumice, scoria, or tuff.
4.2 The aggregates shall be composed predominately of lightweight-cellular and granular inorganic material.
5. Chemical Composition
5.1 Lightweight aggregates shall not contain excessive amounts of deleterious substances, as determined by the following limits:
5.1.1 Organic Impurities (Test Method C40/C40M)—Lightweight aggregates that, upon being subjected to test for organic
impurities, produce a color darker than the standard shall be rejected, unless it is demonstrated that the discoloration is due to small
quantities of materials not harmful to the concrete.
5.1.2 Staining (Test Method C641)—An aggregate producing a stain index of 60 or higher shall be rejected when the deposited
stain is found upon chemical analysis to contain an iron content, expressed as Fe O equal to or greater than 1.5 mg/200 g of
2 3
sample.
5.1.3 Loss on Ignition (Test Methods C114)—The loss on ignition of lightweight aggregates shall not exceed 5 %.
NOTE 2—Some aggregates may contain carbonates or water of hydration that contribute to loss on ignition but may not affect the quality of the product.
Therefore, when evaluating an aggregate, consideration should be given to the material characteristics that cause the ignition loss.
6. Physical Properties
6.1 Lightweight aggregate under test shall meet the following requirements:
6.1.1 Clay Lumps and Friable Particles—The total amount of clay lumps and friable particles shall not exceed 2 % by dry mass.
6.1.2 Grading—The grading shall conform to the requirements shown in Table 1.
NOTE 3—The surfaces of pyro-processed lightweight aggregate particles finer than 75 μm (No. 200) 75 μm (No. 200) sieves are not deleterious and may
be moderately pozzolanic.
C330/C330M − 23
TABLE 1 Grading Requirements for Lightweight Aggregate for Structural Concrete
Percentages (Mass) Passing Sieves Having Square Openings
Nominal Size Designation
25.0 mm 19.0 mm 12.5 mm 9.5 mm 4.75 mm 2.36 mm 1.18 mm 300 μm 150 μm 75 μm
3 1 3
(1 in.) ( ⁄4 in.) ( ⁄2 in.) ( ⁄8 in.) (No. 4) (No. 8) (No. 16) (No. 50) (No. 100) (No. 200)
Fine aggregate:
4.75 mm to 0 . . . 100 85–100 . 40–80 10–35 5–25 .
Coarse aggregate:
25.0 m to 4.75 mm 95–100 . 25–60 . 0–10 . . . . 0–10
19.0 mm to 4.75 mm 100 90–100 . 10–50 0–15 . . . . 0–10
12.5 mm to 4.75 mm . 100 90–100 40–80 0–20 0–10 . . . 0–10
9.5 mm to 2.36 mm . . 100 80–100 5–40 0–20 0–10 . . 0–10
Combined fine and coarse aggregate:
12.5 mm to 0 . 100 95–100 . 50–80 . . 5–20 2–15 0–10
9.5 mm to 0 . . 100 90–100 65–90 35–65 . 10–25 5–15 0–10
6.1.3 Uniformity of Grading—To ensure reasonable uniformity in the grading of successive shipments of lightweight aggregate,
fineness modulus shall be determined on samples taken from shipments at intervals stipulated by the purchaser. If the fineness
modulus of the aggregate in any shipment differs by more than 7 % from that of the sample submitted for acceptance tests, the
aggregate in the shipment shall be rejected, unless the supplier demonstrates that it will produce concrete of the required
characteristics.
6.1.4 Loose Bulk Density (Test Method C29/C29M)—The dry loose bulk density of lightweight aggregates shall conform to the
requirements shown in Table 2 using a 14 L [ ⁄2 cubic foot] measure.
6.1.5 Uniformity of Loose Bulk Density—The dry loose bulk density of lightweight aggregate shipments sampled and tested, shall
not differ by more than 10 % from that of the sample submitted for acceptance tests, and shall not exceed the limits in Table 2.
6.1.6 Relative Density—When specified, the relative density shall be determined in accordance with 9.10.
6.2 Concrete specimens containing lightweight aggregate under test shall meet the following requirements:
6.2.1 Compressive Strength (Test Method C39/C39M), Density (Test Method C567/C567M), and Splitting Tensile Strength (Test
Method C496/C496M)— Compressive strength and density shall be an average of three specimens and the splitting tensile strength
shall be the average of eight specimens. It shall be possible to produce structural concrete using the lightweight aggregates under
test, so that from the same batch of concrete one or more of the compressive strength requirements and splitting tensile strength
requirements in Table 3 will be satisfied without exceeding the corresponding maximum density values.
NOTE 4—Intermediate values for strength and corresponding density values shall be established by interpolation. Materials that do not meet the minimum
average splitting tensile strength requ
...