ASTM D7705/D7705M-12
(Test Method)Standard Test Method for Alkali Resistance of Fiber Reinforced Polymer (FRP) Matrix Composite Bars used in Concrete Construction
Standard Test Method for Alkali Resistance of Fiber Reinforced Polymer (FRP) Matrix Composite Bars used in Concrete Construction
SIGNIFICANCE AND USE
This test method is intended to determine alkaline resistance data for material specifications, research and development, quality assurance, and structural design and analysis. Depending on the procedure and test matrix, the primary test results are the mass change and tensile capacity retention of the test specimen, which are important factors to be considered in the use of FRP reinforcing bars. Procedures A and B are accelerated tests, substituting an alkaline aqueous environment for the presence of concrete porewater. Procedure C can be used to establish the accelerating effect of Procedure B.
Procedure A is appropriate for rapid screening of FRP bars for alkali resistance.
Procedure B is appropriate for characterizing the alkali resistance of FRP bars under sustained mechanical loading in a standard aqueous alkaline environment intended to represent the concrete porewater.
Procedure C is appropriate for characterizing the alkali resistance of FRP bars under sustained mechanical loading in Portland cement concrete.
SCOPE
1.1 This test method covers the procedure for evaluating the alkali resistance of FRP bars used as reinforcing bars in concrete. Alkali resistance is measured by subjecting the FRP bars to an aqueous alkali environment, with or without sustained tensile stress, and then testing them to failure in tension according to Test Method D7205/D7205M. This standard presents three procedures conducted at a moderately elevated temperature of 60ºC (140ºF), each defining different loading conditions. The test method is also appropriate for use with linear segments of FRP reinforcements cut from two- or three-dimensional reinforcing grid.
1.2 The values stated in either inch-pound units or SI units shall be regarded separately as the standard. The inch-pound units are shown in the parenthesis. The values stated in each system are not exact equivalents; therefore each system shall be used independently of each other. Combining values from the two systems may result in non-conformance.
1.3 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 and health practices and determine the applicability of regulatory limitations prior to use.
General Information
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Standards Content (Sample)
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Designation: D7705/D7705M − 12
Standard Test Method for
Alkali Resistance of Fiber Reinforced Polymer (FRP) Matrix
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Composite Bars used in Concrete Construction
This standard is issued under the fixed designation D7705/D7705M; 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 C511 Specification for Mixing Rooms, Moist Cabinets,
Moist Rooms, and Water Storage Tanks Used in the
1.1 This test method covers the procedure for evaluating the
Testing of Hydraulic Cements and Concretes
alkali resistance of FRP bars used as reinforcing bars in
C1260 Test Method for Potential Alkali Reactivity of Ag-
concrete. Alkali resistance is measured by subjecting the FRP
gregates (Mortar-Bar Method)
bars to an aqueous alkali environment, with or without sus-
C1293 Test Method for Determination of Length Change of
tained tensile stress, and then testing them to failure in tension
Concrete Due to Alkali-Silica Reaction
according to Test Method D7205/D7205M. This standard
D618 Practice for Conditioning Plastics for Testing
presents three procedures conducted at a moderately elevated
D883 Terminology Relating to Plastics
temperature of 60ºC (140ºF), each defining different loading
D3878 Terminology for Composite Materials
conditions. The test method is also appropriate for use with
D7205/D7205M Test Method for Tensile Properties of Fiber
linear segments of FRP reinforcements cut from two- or
Reinforced Polymer Matrix Composite Bars
three-dimensional reinforcing grid.
E4 Practices for Force Verification of Testing Machines
1.2 The values stated in either inch-pound units or SI units
E6 Terminology Relating to Methods of Mechanical Testing
shall be regarded separately as the standard. The inch-pound
E70 Test Method for pH of Aqueous Solutions With the
units are shown in the parenthesis. The values stated in each
Glass Electrode
system are not exact equivalents; therefore each system shall
E456 Terminology Relating to Quality and Statistics
be used independently of each other. Combining values from
3. Terminology
the two systems may result in non-conformance.
3.1 Terminology in D3878 defines terms relating to high-
1.3 This standard does not purport to address all of the
modulus fibers and their composites. Terminology in D883
safety concerns, if any, associated with its use. It is the
defines terms relating to plastics. Terminology in E6 defines
responsibility of the user of this standard to establish appro-
terms relating to mechanical testing. Terminology in E456
priate safety and health practices and determine the applica-
defines terms relating to statistics and the selection of sample
bility of regulatory limitations prior to use.
sizes. In the event of a conflict between terms, Terminology in
D3878 shall have precedence over the other terminology
2. Referenced Documents
standards.
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2.1 ASTM Standards:
3.2 Definitions of Terms Specific to This Standard:
A615/A615M SpecificationforDeformedandPlainCarbon-
3.2.1 bar, n—a linear element, with a substantially round
Steel Bars for Concrete Reinforcement
cross-section, often with surface undulations or a coating of
C192/C192M Practice for Making and Curing Concrete Test
particles that promote mechanical interlock with concrete.
Specimens in the Laboratory
C496/C496M Test Method for Splitting Tensile Strength of
3.2.2 nominal cross-sectional area, n—a measure of cross-
Cylindrical Concrete Specimens
sectional area of a bar, determined over at least one represen-
tative length, used to calculate stress.
3.2.3 representative length, n—the minimum length of a bar
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This test method is under the jurisdiction of ASTM Committee D30 on
that contains a repeating geometric pattern that, placed end-to-
Composite Materials and is the direct responsibility of Subcommittee D30.10 on
end, reproduces the geometric pattern of a continuous bar
Composites for Civil Structures.
(usually used in reference to bars having surface undulations
Current edition approved March 1, 2012. Published April 2012. DOI: 10.1520/
for enhancing interlock with concrete).
D7705_D7705M-12.
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For referenced ASTM standards, visit the ASTM website, www.astm.org, or
3.2.4 standard cross-sectional area, n—the cross-sectional
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
area of a standard numbered steel concrete reinforcing bar as
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. given in Specification A615/A615M, Table 1.
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