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ASTM D6916-06

(Test Method)

Standard Test Method for Determining the Shear Strength Between Segmental Concrete Units (Modular Concrete Blocks)

Standard Test Method for Determining the Shear Strength Between Segmental Concrete Units (Modular Concrete Blocks)

SCOPE
1.1 This test method is used to determine the shear strength between two layers of segmental concrete block units used in construction of reinforced soil retaining walls. The test is carried out under conditions determined by the user that reproduce the facing system at full-scale. The results of a series of tests are used to define a relationship between shear strength developed between segmental concrete units and normal load.
1.2 This is a performance test used to determine properties for design of retaining wall systems utilizing segmental concrete units and soil reinforcing geosynthetics, either geotextiles or geogrids. The test is performed on a full-scale construction of the facing system and may be run in a laboratory or the field.
1.3 The values stated in SI units are regarded as the standard. The values stated in inch-pound units are provided for information only.
1.4 This standard may involve hazardous materials, operations, and equipment. 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

Status
Historical
Publication Date
14-Jan-2006
ICS
91.100.30 - Concrete and concrete products
Technical Committee
D35 - Geosynthetics
Drafting Committee
D35.01 - Mechanical Properties
Current Stage
Ref Project

Relations

Replaces
ASTM D6916-03 - Standard Test Method for Determining the Shear Strength Between Segmental Concrete Units (Modular Concrete Blocks)
Effective Date
15-Jan-2006
Replaced By
ASTM D6916-06a - Standard Test Method for Determining the Shear Strength Between Segmental Concrete Units (Modular Concrete Blocks)
Effective Date
15-Mar-2006

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ASTM D6916-06 - Standard Test Method for Determining the Shear Strength Between Segmental Concrete Units (Modular Concrete Blocks)ASTM D6916-06 - Standard Test Method for Determining the Shear Strength Between Segmental Concrete Units (Modular Concrete Blocks)
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ASTM D6916-06 - Standard Test Method for Determining the Shear Strength Between Segmental Concrete Units (Modular Concrete Blocks)
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D6916–06
Standard Test Method for
Determining the Shear Strength Between Segmental
1
Concrete Units (Modular Concrete Blocks)
This standard is issued under the fixed designation D 6916; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
1.1 This test method is used to determine the shear strength 3.1 Definitions:
between two layers of segmental concrete block units used in 3.1.1 displacement criteria, n—a user prescribed maximum
construction of reinforced soil retaining walls. The test is movement, mm (in.), of the top segmental concrete unit out
carried out under conditions determined by the user that from the back of lower segmental concrete units.
reproducethefacingsystematfull-scale.Theresultsofaseries 3.1.2 geosynthetic, n—a planar product manufactured from
of tests are used to define a relationship between shear strength polymeric material used with soil, rock, earth, or other geo-
developed between segmental concrete units and normal load. technical engineering related material as an integral part of a
1.2 This is a performance test used to determine properties man-made project, structure or system. D 4439
for design of retaining wall systems utilizing segmental con- 3.1.3 granular infill, n—coarse grained soil aggregate used
crete units and soil reinforcing geosynthetics, either geotextiles to fill the voids in and between segmental concrete units.
or geogrids. The test is performed on a full-scale construction 3.1.4 peak shear strength, n—the maximum shear capacity
ofthefacingsystemandmayberuninalaboratoryorthefield. between segmental concrete units.
1.3 The values stated in SI units are regarded as the 3.1.5 segmental concrete depth, n—the segmental concrete
standard. The values stated in inch-pound units are provided unit dimension perpendicular to the wall face.
for information only. 3.1.6 segmental concrete unit (modular concrete block),
1.4 This standard may involve hazardous materials, opera- n—a concrete unit manufactured specifically for mortarless,
tions, and equipment. This standard does not purport to dry-stack retaining wall construction.
address all of the safety concerns, if any, associated with its 3.1.7 segmental concrete unit width, n—the segmental con-
use. It is the responsibility of the user of this standard to crete unit dimension parallel to the wall face.
establish appropriate safety and health practices and deter- 3.2 For definition of other terms relating to geosynthetics,
mine the applicability of regulatory limitations prior to use. refer to Terminology D 4439.
2. Referenced Documents 4. Summary of Test Method
2
2.1 ASTM Standards: 4.1 In this test method, segmental concrete units are as-
D 448 Classification for Sizes of Aggregate for Road and sembled in two rows (layers). The bottom row is laterally
Bridge Construction restrained. The top row is loaded vertically to a constant
D 4354 Practice for Sampling of Geosynthetics for Testing surcharge load and the interface is sheared at a constant rate of
D 4439 Terminology for Geosynthetics displacement until a drop of load after the peak load occurs.
D 4595 Test Method for Tensile Properties of Geotextiles The test may be run with the geosynthetic reinforcement
by the Wide-Width Strip Method sandwiched between the two rows of segmental concrete units
D 6637 Test Method for Determining Tensile Properties of to determine the shear strength between segmental concrete
Geogrids by the Single or Multi-Rib Tensile Method units at the connection between the units and the geosynthetic
reinforcement.
1
This test method is under the jurisdiction of ASTM Committee D35 on 5. Significance and Use
Geosynthetics and is the direct responsibility of Subcommittee D35.01 on Mechani-
5.1 The shear strength between segmental concrete units
cal Properties.
(with and without geosynthetic reinforcement) and is used in
Current edition approved Jan. 15, 2006. Published March 2006. Originally
approved in 2003. Last previous edition approved in 2003 as D 6916–03.
design of reinforced soil retaining walls.
2
For referenced ASTM standrds, visit the ASTM Web Site, www.astm.org. or
5.2 This test is used to determine the shear strength for the
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
design of the facing stability of segmental retaining walls.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM web site. Performing a series of these shear tests at varying normal loads
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA
...

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SIGNIFICANCE AND USE
5.1 The shear strength between segmental concrete units (with and without geosynthetic reinforcement) is used in design of reinforced soil retaining walls.  
5.2 This test is used to determine the shear strength for the design of the facing stability of segmental retaining walls. Performing a series of these shear tests at varying normal loads permits development of a relationship between shear strength and normal load. This relationship may be linear, bilinear, or some other complex mathematical expression.  
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1.1 This test method is used to determine the shear strength between two layers of segmental concrete block units used in construction of reinforced soil retaining walls. The test is carried out under conditions determined by the user that reproduce the facing system at full scale. The results of a series of tests are used to define a relationship between shear strength developed between segmental concrete units and normal load.  
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5.1 This test method provides a procedure to determine the passing ability of self-consolidating concrete. This test method is applicable for laboratory use in comparing the passing ability of different concrete mixtures. It is also applicable in the field as a quality control test.  
5.2 The difference between the slump flow and J-Ring flow is an indication of the passing ability of the concrete. A difference less than 25 mm [1 in.] indicates good passing ability and a difference greater than 50 mm [2 in.] indicates poor passing ability. The orientation of the mold for the J-Ring test and for the slump flow test without the J-Ring shall be the same.  
5.3 This test method is limited to self-consolidating concrete with nominal maximum size of aggregate of up to 25 mm [1 in.].
SCOPE
1.1 This test method covers determination of the passing ability of self-consolidating concrete (SCC) by using the J-Ring in combination with a mold.  
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.  
1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the 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. (Warning—Fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure.2)  
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ASTM C1758/C1758M-23(Practice)
Standard Practice for Fabricating Test Specimens with Self-Consolidating Concrete

SIGNIFICANCE AND USE
4.1 Existing practices and test methods for fabricating fresh concrete test specimens are not suited to SCC. This practice provides requirements and procedures for fabricating test specimens with SCC having a slump flow of 500 mm [20 in.] or greater.
SCOPE
1.1 This practice covers procedures for fabricating test specimens in the laboratory or field using a representative sample of fresh self-consolidating concrete (SCC). This practice is applicable to SCC with a nominal maximum aggregate size up to 25 mm [1 in.] and a slump flow of 500 mm [20 in.] or greater. If the slump flow is less than 500 mm [20 in.] follow the fabrication procedures described in the standard for which the test specimen is required.  
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.  
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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.

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This test method covers the determination of strength of cylindrical concrete specimens that have been molded in place using special molds attached to formwork. A concrete cylinder mold assembly consisting of a mold and a tubular support member is fastened within the concrete formwork prior to placement of the concrete. The elevation of the mold upper edge is adjusted to correspond to the plane of the finished slab surface. The mold support prevents direct contact of the slab concrete with the outside of the mold and permits its easy removal from the hardened concrete. Strength of cast-in-place cylinders may be used for various purposes, such as estimating the load-bearing capacity of slabs, determining the time of form and shore removal, and determining the effectiveness of curing and protection. Consolidation of concrete in the mold may be varied to simulate the conditions of placement. Internal vibration of concrete in the mold is prohibited except under special circumstances.
SIGNIFICANCE AND USE
4.1 Cast-in-place cylinder strength relates to the strength of concrete in the structure due to the similarity of curing conditions because the cylinder is cured within the slab. However, due to differences in moisture condition, degree of consolidation, specimen size, and length-diameter ratio, there is not a unique relationship between the strength of cast-in-place cylinders and cores of the same age. When cores can be drilled undamaged and tested in the same moisture condition as the cast-in-place cylinders, the strength of the cylinders can be expected to be on average 10 % higher than the cores at ages up to 91 days for specimens of the same size and length-diameter ratio.4  
4.2 Strength of cast-in-place cylinders may be used for various purposes, such as estimating the load-bearing capacity of slabs, determining the time of form and shore removal, and determining the effectiveness of curing and protection.
SCOPE
1.1 This test method covers the determination of strength of cylindrical concrete specimens that have been molded in place using special molds attached to formwork. This test method is limited to use in slabs where the depth of concrete is from 125 mm to 300 mm [5 in. to 12 in.].  
1.2 The text of this standard refers to notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.  
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