ASTM D8329-21

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Designation: D8329 − 20 D8329 − 21
Standard Test Method for
Determination of Water/Cementitious Materials Ratio for
Geosynthetic Cementitious Composite Mats (GCCMs) and
Measurement of the Compression Strength of the
Cementitious Material Contained Within
This standard is issued under the fixed designation D8329; 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 The purpose of the proposed test method is to obtain a water/cementitious material ratio that allows for a practical
measurement of the compressive strength of the cementitious material contained within a geosynthetic cementitious composite mat
(GCCM). This water/cementitious material ratio should be generally representative of that achieved practically upon the hydration
of a GCCM. Because GCCM materials do not involve mixing or the use of exact water hydration methods when employed in the
field, this method is necessary to provide a quantitative estimate of the water/cementitious material ratio.
1.2 This procedure determines the water/cementitious material ratio for a properly hydrated GCCM, which is then used to create
cube or cylinder specimens for compressive strength testing as per the appropriate referenced ASTM test methods. Compressive
strength results will then be representative of the strength of the inherent cementitious material found in the GCCM after normal
GCCM hydration.
1.3 The values in SI units are to be regarded as standard. Values in inch-pound units are in parentheses for information.
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.
2. Referenced Documents
2.1 ASTM Standards:
C39/C39M Test Method for Compressive Strength of Cylindrical Concrete Specimens
C109/C109M Test Method for Compressive Strength of Hydraulic Cement Mortars (Using 2-in. or [50 mm] Cube Specimens)
D4439 Terminology for Geosynthetics
D8030/D8030M Practice for Sample Preparation for GCCM
This test method is under the jurisdiction of ASTM Committee D35 on Geosynthetics and is the direct responsibility of Subcommittee D35.05 on Geosynthetic Erosion
Control.
Current edition approved June 1, 2020May 1, 2021. Published June 2020May 2021. Originally approved in 2020. Last previous edition approved in 2020 as D8329 – 20.
DOI: 10.1520/D8329-20.10.1520/D8329-21.
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.
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D8329 − 21
3. Terminology
3.1 Definitions:
3.1.1 deconsolidation, n—process by which the specimens are exercised and loosened such that they approximate a GCCM that
has been deployed in the field.
3.2 For definitions of other terms used in this standard, refer to Terminology D4439.
4. Summary of Test Method
4.1 This method involves measuring the mass per unit area of uncured GCCM samples, measuring the mass per unit area of the
geosynthetic portion(s), and using this to calculate the mass per unit area of the cementitious material contained within the GCCM.
This mass per unit area of the cementitious material is used in conjunction with the mass per unit area of the cured saturated surface
dry (SSD) GCCM to determine the water/cementitious material ratio representative of a properly cured and hydrated GCCM. This
water/cementitious material ratio then forms the basis for laboratory preparation of the same cementitious material for specimens
which will then be tested for compressive strength as per the appropriate ASTM standard methods.
5. Significance and Use
5.1 Hydration is a critical aspect of GCCM installation. GCCM installations are often hydrated with excess water to ensure that
a saturated condition exists. Therefore, it is not generally possible to monitor and control exactly the water addition that absorbs
and hydrates the cementitious materials due the practical methods of hydration in use.
5.2 It is important to be able to distinguish the quality of cementitious material used in applications for GCCMs. A measurement
of compressive strength properties of the cementitious material is often an accepted method to provide a measure of the cement
strength and quality. The compressive strength properties will vary with the water/cementitious material ratio and, therefore, it is
necessary to determine a practical value that approximates in-use hydration and not a water/cementitious material ratio that simply
provides the maximum properties but cannot be expected as representative of actual use conditions.
5.3 The compressive strength of the cementitious material can be affected by both over and under hydration.
5.4 This method identifies a means to obtain a water/cementitious material ratio representative of that obtained by proper hydration
of GCCMs to allow replication for laboratory compressive strength testing for use by GCCM designers, inspectors, and installers.
6. Apparatus
6.1 Laboratory oven capable of 100 °C and maintaining a constant temperature within 62 °C.
6.2 Laboratory balance capable of measurement to 60.5 g accuracy.
6.3 Length measurement device capable of measurement to 62 mm accuracy.
6.4 Cylinder or pipe with outer diameter of between 50 and 75 mm and minimum 300 mm length.
6.5 Absorbent pads or paper towels.
7. Sampling, Test Specimens, and Test Units
7.1 Specimens shall be a minimum of 300 mm by 300 mm square but no larger than 400 mm by 400 mm.
7.2 A Prepare a minimum of five specimens shall be obtained as part of this standard to produceten (10) uncured specimens
according to Practice D8030/D8030Maverage values for the water/cementitious material ratio., Procedure A. An even number of
specimen must be prepared.
D8329 − 21
7.3 Record the dry (uncured) specimen weight in grams to the nearest 0.5 g or less. Measure the width and length of the specimen
to 62 mm.
7.4 Calculate the mass per unit surface area of each uncured specimen as per Eq 1:
W
i
M 5 (1)
i
L 3D
i i
where:
M = mass per unit area (g/mm ) of component i,
i
i = specific component(s) including geosynthetic material, cementitious material, water, or combinations thereof,
W = mass of the GCCM, g,
i
L = length of the GCCM specimen, mm, and
i
D = width of the GCCM specimen, mm.
i
7.5 Order the specimens from lowest mass per unit surface area to the highest mass per unit surface area and label them from 1
(lowest) to 10 (highest).
7.6 Use odd number specimens (1, 3, 5, 7, 9…) in 8.1 and use even number specimens (2, 4, 6, 8, 10…) in 8.2.
8. Procedure
8.1 Determination of Geosynthetic Portion(s) an
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