ASTM C1152/C1152M-20

Standard Test Method for Acid-Soluble Chloride in Mortar and Concrete

SIGNIFICANCE AND USE
4.1 The amount of acid-soluble chloride in most hydraulic-cement systems is equal to the total amount of chloride in the system. However, some organic substances that may be introduced into mortar or concrete contain chloride that is initially acid-insoluble that can eventually ionize and thus become acid-soluble or water-soluble after a period of exposure in the very alkaline cement system.  
4.2 Sulfides are known to interfere with the determination of chloride content. Blast-furnace slag aggregates and cements contain sulfide sulfur in concentrations that can cause such interference and produce erroneously high test results. Treatment with hydrogen peroxide, as discussed in Test Methods C114, is used to eliminate such interference.  
4.3 There are aggregates that contain chloride that is not available for corrosion. Such chloride will be detected by the use of this method.4
SCOPE
1.1 This test method2 provides procedures for the sampling and analysis of hydraulic-cement mortar or concrete for chloride that is acid soluble under the conditions of test. In most cases, acid-soluble chloride is equivalent to total chloride.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Some values have only SI units because the inch-pound equivalents are not used in practice.
Note 1: Sieve size is identified by its standard designation in Specification E11. The alternative designation in parentheses is for information only and does not represent a different standard sieve size.  
1.3 The text of this standard references notes and footnotes that provide explanatory information. These notes and footnotes shall not be considered as requirements of this standard.  
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.5 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-2020
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• ICS: 91.100.30 - Concrete and concrete products
• Technical Committee: C09 - Concrete and Concrete Aggregates
• Drafting Committee: C09.69 - Miscellaneous Tests

Relations

• Refers: ASTM C670-24a - Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
• Effective Date: 01-Feb-2024
• Refers: ASTM C670-24 - Standard Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
• Effective Date: 01-Jan-2024
• 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 C1084-19 - Standard Test Method for Portland-Cement Content of Hardened Hydraulic-Cement Concrete
• Effective Date: 15-Dec-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 C42/C42M-18 - Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
• Effective Date: 15-Mar-2018
• Refers: ASTM C125-18 - Standard Terminology Relating to Concrete and Concrete Aggregates
• Effective Date: 01-Jan-2018
• Refers: ASTM C823/C823M-12(2017) - Standard Practice for Examination and Sampling of Hardened<brk/> Concrete in Constructions
• Effective Date: 01-May-2017
• Refers: ASTM C125-16 - Standard Terminology Relating to Concrete and Concrete Aggregates
• Effective Date: 15-Dec-2016
• Refers: ASTM C42/C42M-16 - Standard Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
• Effective Date: 01-Oct-2016
• Refers: ASTM C125-15b - Standard Terminology Relating to Concrete and Concrete Aggregates
• Effective Date: 15-Dec-2015
• Refers: ASTM C125-15a - Standard Terminology Relating to Concrete and Concrete Aggregates
• Effective Date: 01-Jul-2015

Overview

ASTM C1152/C1152M-20: Standard Test Method for Acid-Soluble Chloride in Mortar and Concrete provides procedures for sampling and analyzing hydraulic-cement mortar or concrete to determine the content of acid-soluble chloride. Acid-soluble chloride is a key parameter affecting the durability of concrete structures, as excess chloride can contribute to the corrosion of embedded steel reinforcement. This test method is widely recognized and used in construction, quality control, and research settings to ensure compliance with performance and safety requirements for concrete materials.

Key Topics

• Purpose and Scope

  • Defines procedures for identifying and quantifying acid-soluble chloride content in hydraulic-cement mortar and concrete.
  • Emphasizes that, under typical conditions, acid-soluble chloride is equal to total chloride in most systems.
  • Notes that some substances may contain initially acid-insoluble chloride that becomes soluble over time.

• Significance in Concrete Durability

  • Excess chloride promotes corrosion of embedded steel, compromising structural integrity.
  • Chloride sources in concrete can include raw materials, admixtures, and external environmental exposures.

• Interferences and Mitigation

  • Sulfides, often present in blast-furnace slag aggregates and cements, can interfere with chloride determination.
  • Specific procedures, such as treatment with hydrogen peroxide, are used to eliminate interference during analysis.

• Precision and Limitations

  • Details the expected precision and repeatability of the chloride determination process.
  • Points out certain types of chloride from aggregates may not be relevant to corrosion but will be detected by this method.

Applications

• Quality Control in Construction

  • Used for routine quality assurance on fresh and hardened concrete to ensure chloride content falls within allowable limits specified by building codes and owners.

• Condition Assessment of Existing Structures

  • Supports the assessment of bridges, parking structures, and marine facilities for future maintenance planning by measuring chloride ingress and potential corrosion risks.

• Material Research and Development

  • Assists researchers and manufacturers in evaluating new cementitious materials, admixtures, and repair products with regard to potential chloride contribution to concrete.

• Regulatory Compliance

  • Enables producers and contractors to demonstrate compliance with regional, national, or international standards for reinforced concrete construction.

Related Standards

• ASTM C114 - Chemical Analysis of Hydraulic Cement
  Reference method for analyzing chemical components, including procedures for overcoming analytical interferences.

• ASTM C42/C42M - Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
  Used for sampling concrete cores for chloride testing.

• ASTM C823/C823M - Examination and Sampling of Hardened Concrete in Constructions
  Provides guidance on the selection and handling of hardened concrete samples.

• ASTM C125 - Terminology Relating to Concrete and Concrete Aggregates
  Source of standardized terminology used throughout the industry.

• ASTM C1084 - Determining Portland-Cement Content of Hardened Concrete
  Supports calculations related to chloride content by mass of cement.

• ASTM D1193 - Specification for Reagent Water
  Ensures quality control of water used in testing procedures.

• ASTM E11 - Specification for Woven Wire Test Sieve Cloth and Test Sieves
  Specifies sieves essential for sample preparation.

Conclusion

ASTM C1152/C1152M-20 is a critical standard for the determination of acid-soluble chloride in mortar and concrete, directly supporting the durability, safety, and compliance of concrete structures. Its application spans from quality assurance in fresh concrete to the assessment of existing infrastructure, making it a fundamental standard in the concrete industry. By referencing related ASTM standards, users ensure accurate, reliable, and standardized results, helping to protect reinforced concrete from the risks associated with chloride-induced corrosion.

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: C1152/C1152M − 20
Standard Test Method for
Acid-Soluble Chloride in Mortar and Concrete
ThisstandardisissuedunderthefixeddesignationC1152/C1152M;thenumberimmediatelyfollowingthedesignationindicatestheyear
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* Cores and Sawed Beams of Concrete
C114Test Methods for Chemical Analysis of Hydraulic
1.1 This test method provides procedures for the sampling
Cement
and analysis of hydraulic-cement mortar or concrete for
C125Terminology Relating to Concrete and Concrete Ag-
chloride that is acid soluble under the conditions of test. In
gregates
mostcases,acid-solublechlorideisequivalenttototalchloride.
C670Practice for Preparing Precision and Bias Statements
1.2 The values stated in either SI units or inch-pound units
for Test Methods for Construction Materials
are to be regarded separately as standard. Some values have
C702/C702MPractice for Reducing Samples of Aggregate
only SI units because the inch-pound equivalents are not used
to Testing Size
in practice.
C823/C823MPractice for Examination and Sampling of
NOTE 1—Sieve size is identified by its standard designation in Speci-
Hardened Concrete in Constructions
fication E11.The alternative designation in parentheses is for information
C1084Test Method for Portland-Cement Content of Hard-
only and does not represent a different standard sieve size.
ened Hydraulic-Cement Concrete
1.3 The text of this standard references notes and footnotes
D1193Specification for Reagent Water
that provide explanatory information. These notes and foot-
E11Specification forWovenWireTest Sieve Cloth andTest
notes shall not be considered as requirements of this standard.
Sieves
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the 3. Terminology
responsibility of the user of this standard to establish appro-
3.1 Definitions:
priate safety, health, and environmental practices and deter-
3.1.1 For definitions of terms used in this test method, refer
mine the applicability of regulatory limitations prior to use.
to Terminology C125.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Significance and Use
ization established in the Decision on Principles for the
4.1 The amount of acid-soluble chloride in most hydraulic-
Development of International Standards, Guides and Recom-
cement systems is equal to the total amount of chloride in the
mendations issued by the World Trade Organization Technical
system. However, some organic substances that may be intro-
Barriers to Trade (TBT) Committee.
duced into mortar or concrete contain chloride that is initially
acid-insoluble that can eventually ionize and thus become
2. Referenced Documents
acid-soluble or water-soluble after a period of exposure in the
2.1 ASTM Standards:
very alkaline cement system.
C42/C42MTest Method for Obtaining and Testing Drilled
4.2 Sulfidesareknowntointerferewiththedeterminationof
chloride content. Blast-furnace slag aggregates and cements
contain sulfide sulfur in concentrations that can cause such
This test method is under the jurisdiction of ASTM Committee C09 on
interference and produce erroneously high test results. Treat-
Concrete and ConcreteAggregates and is the direct responsibility of Subcommittee
C09.69 on Miscellaneous Tests. ment with hydrogen peroxide, as discussed in Test Methods
CurrenteditionapprovedJune1,2020.PublishedJuly2020.Originallyapproved
C114, is used to eliminate such interference.
ε1
in 1990. Last previous edition approved in 2012 as C1152/C1152M–04 (2012) .
DOI: 10.1520/C1152_C1152M-20. 4.3 There are aggregates that contain chloride that is not
This test method is based on a report by Clear, K. C., and Harrigan, E. T.,
available for corrosion. Such chloride will be detected by the
“SamplingandTestingforChlorideIoninConcrete,”ReportNo.FHWA-RD77-85,
use of this method.
Federal Highway Administration, Washington, DC, August 1977 (available as PB
275-428/AS National Technical Information Services).
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM For more information, see Hope, B. B., Page, J. A., and Poland, J. S., “The
Standards volume information, refer to the standard’s Document Summary page on Determination of the Chloride Content of Concrete,” Cement and Concrete
the ASTM website. Research,Vol15,No.5,PergamonPress,NewYork,September1985,pp.863–870.
*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
C1152/C1152M − 20
5. Apparatus teeonAnalyticalReagentsoftheAmericanChemicalSociety.
Other grades may be used, provided it is first ascertained that
5.1 Sampling Equipment:
the reagent is of sufficiently high purity to permit its use
5.1.1 The apparatus required for obtaining samples by
without lessening the accuracy of the determination.
coring or sawing is described in Test Method C42/C42M.
6.1.1 Sodium Chloride (NaCl).
5.1.2 Use the following apparatus for sampling by drilling
6.1.2 Silver Nitrate (AgNO ).
(pulverization): 6.1.3 Potassium Chloride (KCl), (required for silver billet
electrode only).
5.1.2.1 Rotary Impact Drill and drill or pulverizing bits of
6.1.4 Reagent Water conforming to the requirements of
sufficient diameter to provide a representative sample of
Specification D1193 for Type III reagent water.
sufficient size for testing.
6.1.5 Sodium Chloride, Standard Solution (0.05 N NaCl)—
5.1.2.2 Spoon or other suitable means to remove pulverized
Dry sodium chloride at 105 to 110 °C to a constant mass.
sample material from drill hole without contamination.
Weigh 2.9222 g of dried reagent. Dissolve in water and dilute
5.1.2.3 Sample Containers capable of maintaining samples
to exactly 1 L in a volumetric flask and mix thoroughly. This
in an uncontaminated state.
solutionisthestandardandrequiresnofurtherstandardization.
6.1.6 Silver Nitrate, Standard Solution(0.05N(AgNO ))—
5.2 Sample Processing Apparatus—The apparatus required
Dissolve 8.4938 g of silver nitrate in water. Dilute to 1 L in a
forprocessingsamplesshallbechosenforitssuitabilityforthe
volumetric flask and mix thoroughly. Standardize against 5.00
purposes of the investigation, and frequently includes a con-
mLof standard 0.05 N sodium chloride solution diluted to 150
crete saw and one or more pulverizers.
mLwith water following the titration test method given in 9.1
5.2.1 Samples more than 25 mm (1 in.) in maximum
beginning with the second sentence. The exact normality shall
dimension shall be reduced in size by use of a jaw crusher or
be calculated from the average of three determinations as
broken into smaller pieces by hammering carefully to avoid
follows:
loss of smaller pieces.
N 5 0.25⁄V
5.2.2 Crush particles less than 25 mm (1 in.) in maximum
dimension using a rotating puck grinding apparatus, or by
where:
usingadiskpulverizer,ormortarandpestleoperatedtorestrict
N = normality of AgNO solution,
to negligible levels the loss of fine particles.
0.25 = milliequivalents NaCl (5.0 × 0.05 N), and
5.2.3 Sieve, 850-µm (No. 20), which shall comply with V = volume of AgNO solution, mL.
Specification E11.
Commercially available standard solutions may be used
provided the normality is checked according to the standard-
5.3 Chloride Determination:
ization procedure.
5.3.1 Balance, shall be capable of reproducing results
6.1.7 Methyl Orange Indicator—Prepare a solution contain-
within 0.0002 g with an accuracy of 60.0002 g. Direct-
ing2gof methyl orange per litre of 95% ethyl alcohol.
reading balances shall have a sensitivity not exceeding 0.0001
6.1.8 Nitric Acid (1+1).
g. Conventional two-pan balances shall have a maximum
6.1.9 Hydrogen Peroxide (30%).
sensibility reciprocal of 0.0003 g. Any rapid weighing device
that may be provided, such as a chain, damped motion, or
7. Sampling
heavy riders, shall not increase the basic inaccuracy by more
7.1 Select the sample in accordance with Practice C823/
than0.0001gatanyreadingandwithanyloadwithintherated
C823M or as required for the purpose of the investigation.
capacity of the balance.
7.1.1 Because of the small nominal maximum size of the
5.3.2 Stirrer, magnetic variable speed, with a TFE-
aggregate in a mortar, pieces of mortar having a mass of 10 g
fluorocarbon coated magnetic stirring bar.
or more will be representative of a rather large volume of
5.3.3 Chloride, Silver/Sulfide Ion Selective Electrode,ora
mortar.
silver billet electrode coated with silver chloride (see Note 2) 7.1.2 Take concrete cores in accordance with Test Method
with an appropriate reference electrode.
C42/C42M unless otherwise specified.
5.3.4 Potentiometer, with millivolt scale readable to 1 mV
NOTE 3—Concrete cores taken in accordance with Test Method
or better. A digital readout is preferred but not required.
C42/C42M may be cut longitudinally to provide a 12-mm [ ⁄2-in.] thick
section generally representative of the core, or cut laterally into 12-mm
NOTE2—SeeNote67ofTestMethodsC114foradiscussionofsuitable
[ ⁄2-in.] thick disks representative of the concrete core at various depths.
electrodes and coating methods.
Concrete farthest from a surface into which chloride has penetrated often
provideschloridedataclosetothatoftheoriginallyplacedfreshconcrete.
5.4 Glazed Paper—Paper to which fine particles do not
The cooling water from core cutting may dissolve some of the chloride.
adhere, for use as described in 8.1.
ACS Reagent Chemicals, Specifications and Procedures for Reagents and
6. Reagents
Standard-Grade Reference Materials, American Chemical Society, Washington,
DC. For suggestions on the testing of reagents not listed by theAmerican Chemical
6.1 Purity of Reagents—Reagent grade chemicals shall be
Society, see Analar Standards for Laboratory Chemicals, BDH Ltd., Poole, Dorset,
used in all tests. Unless otherwise indicated, it is intended that
U.K., and the United States Pharmacopeia and National Formulary, U.S. Pharma-
all reagents shall conform to the specifications of the Commit- copeial Convention, Inc. (USPC), Rockvill
...

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.
´1
Designation: C1152/C1152M − 04 (Reapproved 2012) C1152/C1152M − 20
Standard Test Method for
Acid-Soluble Chloride in Mortar and Concrete
This standard is issued under the fixed designation C1152/C1152M; 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.
ε NOTE—Editorial changes were made throughout in December 2012.
1. Scope Scope*
1.1 This test method provides procedures for the sampling and analysis of hydraulic-cement mortar or concrete for chloride
that is acid soluble under the conditions of test. In most cases, acid-soluble chloride is equivalent to total chloride.
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Some values have only
SI units because the inch-pound equivalents are not used in practice.
NOTE 1—Sieve size is identified by its standard designation in Specification E11. The alternative designation in parentheses is for information only
and does not represent a different standard sieve size.
1.3 The text of this standard references notes and footnotes that provide explanatory information. These notes and footnotes
shall not be considered as requirements of this standard.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
1.5 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:
C42/C42M Test Method for Obtaining and Testing Drilled Cores and Sawed Beams of Concrete
C114 Test Methods for Chemical Analysis of Hydraulic Cement
C125 Terminology Relating to Concrete and Concrete Aggregates
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
C702/C702M Practice for Reducing Samples of Aggregate to Testing Size
C823/C823M Practice for Examination and Sampling of Hardened Concrete in Constructions
C1084 Test Method for Portland-Cement Content of Hardened Hydraulic-Cement Concrete
D1193 Specification for Reagent Water
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology C125.
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregates and is the direct responsibility of Subcommittee C09.69 on
Miscellaneous Tests.
Current edition approved Dec. 15, 2012June 1, 2020. Published January 2013July 2020. Originally approved in 1990. Last previous edition approved in 20042012 as
ε1
C1152 – 04C1152/C1152M – 04 (2012) . DOI: 10.1520/C1152_C1152M-04R12E01.10.1520/C1152_C1152M-20.
This test method is based on a report by Clear, K. C., and Harrigan, E. T., “Sampling and Testing for Chloride Ion in Concrete,” Report No. FHWA-RD77-85, Federal
Highway Administration, Washington, DC, Aug. 1977 (Available as PB 275-428/AS National Technical Information Services).This test method is based on a report by Clear,
K. C., and Harrigan, E. T., “Sampling and Testing for Chloride Ion in Concrete,” Report No. FHWA-RD77-85, Federal Highway Administration, Washington, DC, August
1977 (available as PB 275-428/AS National Technical Information Services).
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’sstandard’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
C1152/C1152M − 20
4. Significance and Use
4.1 The amount of acid-soluble chloride in most hydraulic-cement systems is equal to the total amount of chloride in the system.
However, some organic substances that may be introduced into mortar or concrete contain chloride that is initially acid-insoluble
that can eventually ionize and thus become acid-soluble or water-soluble after a period of exposure in the very alkaline cement
system.
4.2 Sulfides are known to interfere with the determination of chloride content. Blast-furnace slag aggregates and cements
contain sulfide sulfur in concentrations that can cause such interference and produce erroneously high test results. Treatment with
hydrogen peroxide, as discussed in Test Methods C114, is used to eliminate such interference.
4.3 There are aggregates that contain chloride that is not available for corrosion. Such chloride will be detected by the use of
this method.
5. Apparatus
5.1 Sampling EquipmentEquipment:
5.1.1 The apparatus required for obtaining samples by coring or sawing is described in Test Method C42/C42M.
5.1.2 Use the following apparatus for sampling by drilling (pulverization):
5.1.2.1 Rotary Impact Drill and drill or pulverizing bits of sufficient diameter to provide a representative sample of sufficient
size for testing.
5.1.2.2 Spoon or other suitable means to remove pulverized sample material from drill hole without contamination.
5.1.2.3 Sample Containers capable of maintaining samples in an uncontaminated state.
5.2 Sample Processing Apparatus—The apparatus required for processing samples shall be chosen for its suitability for the
purposes of the investigation, and frequently includes a concrete saw and one or more pulverizers.
5.2.1 Samples more than 25 mm (1 in.) in maximum dimension shall be reduced in size by use of a jaw crusher or broken into
smaller pieces by hammering carefully to avoid loss of smaller pieces.
5.2.2 Crush particles less than 25 mm (1 in.) in maximum dimension using a rotating puck grinding apparatus, or by using a
disk pulverizer, or mortar and pestle operated to restrict to negligible levels the loss of fine particles.
5.2.3 Sieve, 850-μm (No. 20), which shall comply with Specification E11.
5.3 Chloride DeterminationChloride Determination:
5.3.1 Balance, shall be capable of reproducing results within 0.0002 g with an accuracy of 6 0.0002 g. Direct-reading balances
shall have a sensitivity not exceeding 0.0001 g. Conventional two-pan balances shall have a maximum sensibility reciprocal of
0.0003 g. Any rapid weighing device that may be provided, such as a chain, damped motion, or heavy riders, shall not increase
the basic inaccuracy by more than 0.0001 g at any reading and with any load within the rated capacity of the balance.
5.3.2 Stirrer, magnetic variable speed, with a TFE-fluorocarbon coated magnetic stirring bar.
5.3.3 Chloride, Silver/Sulfide Ion Selective Electrode, or a silver billet electrode coated with silver chloride (see Note 2) with
an appropriate reference electrode.
5.3.4 Potentiometer, with millivolt scale readable to 1 mV or better. A digital readout is preferred but not required.
NOTE 2—See Note 67 of Test Methods C114 for a discussion of suitable electrodes and coating methods.
5.4 Glazed Paper—Paper to which fine particles do not adhere, for use as described in 7.18.1.
6. Reagents
6.1 Purity of Reagents—Reagent grade chemicals shall be used in all tests. Unless otherwise indicated, it is intended that all
reagents shall conform to the specifications of the Committee on Analytical Reagents of the American Chemical SocietySociety. .
Other grades may be used, provided it is first ascertained that the reagent is of sufficiently high purity to permit its use without
lessening the accuracy of the determination.
6.1.1 Sodium Chloride (NaCl).
6.1.2 Silver Nitrate (AgNO ).
6.1.3 Potassium Chloride (KCl), (required for silver billet electrode only).
6.1.4 Reagent Water conforming to the requirements of Specification D1193 for Type III reagent water.
For more information, see “The Determination of the Chloride Content of Concrete,” by Brian B. Hope, John A. Page and John S. Poland, Cement and Concrete Research,
Volume 15, Number 5, Pergamon Press, New York, September 1985, pp. 863-870.For more information, see Hope, B. B., Page, J. A., and Poland, J. S., “The Determination
of the Chloride Content of Concrete,” Cement and Concrete Research, Vol 15, No. 5, Pergamon Press, New York, September 1985, pp. 863–870.
Reagent Chemicals, American Chemical Society Specifications,ACS Reagent Chemicals, Specifications and Procedures for Reagents and Standard-Grade Reference
Materials, American Chemical Society, Washington, DC. For suggestions on the testing of reagents not listed by the American Chemical Society, see Analar Standards for
Laboratory Chemicals, BDH Ltd., Poole, Dorset, U.K., and the United States Pharmacopeia and National Formulary, U.S. PharmaceuticalPharmacopeial Convention, Inc.
(USPC), Rockville, MD.
C1152/C1152M − 20
6.1.5 Sodium Chloride, Standard Solution (0.05 N NaCl)—Dry sodium chloride at 105 to 110 °C to a constant mass. Weigh
2.9222 g of dried reagent. Dissolve in water and dilute to exactly 1 L in a volumetric flask and mix thoroughly. This solution is
the standard and requires no further standardization.
6.1.6 Silver Nitrate, Standard Solution (0.05 N (AgNO ))—Dissolve 8.4938 g of silver nitrate in water. Dilute to 1 L in a
volumetric flask and mix thoroughly. Standardize against 5.00 mL of standard 0.05 N sodium chloride solution diluted to 150 mL
with water following the titration test method given in 8.19.1 beginning with the second sentence. The exact normality shall be
calculated from the average of three determinations as follows:
N = 0.25/V, where:
N = normality of AgNO solution,
0.25 = milliequivalents NaCl (5.0 × 0.05 N), and
V = volume of AgNO solution, mL.
N 5 0.25⁄V
where:
N = normality of AgNO solution,
0.25 = milliequivalents NaCl (5.0 × 0.05 N), and
V = volume of AgNO solution, mL.
Commercially available standard solutions may be used provided the normality is checked according to the standardization
procedure.
6.1.7 Methyl Orange Indicator—Prepare a solution containing 2 g of methyl orange per litre of 95 % ethyl alcohol.
6.1.8 Nitric Acid (1+1).
6.1.9 Hydrogen Peroxide (30 %).
7. Sampling
7.1 Select the sample in accordance with Practice C823/C823M or as required for the purpose of the investigation.
7.1.1 Because of the small nominal maximum size of the aggregate in a mortar, pieces of mortar having a mass of 10 g or more
will be representative of a rather large volume of mortar.
7.1.2 Take concrete cores in accordance with Test Method C42/C42M unless otherwise specified.
NOTE 3—Concrete cores taken in accordance with Test Method C42/C42M may be cut longitudinally to provide a 12-mm [ ⁄2-in.] thick section
generally representative of the core, or cut laterally into 12-mm [ ⁄2-in.] thick disks representative of the concrete core at various depths. Concrete farthest
from a surf
...