Abstract

This paper reports the results of interface shear testing carried out to investigate the influence of test methodology on shear-displacement behavior of five different segmental (modular) masonry concrete block configurations. The tests were carried out in general conformance with existing ASTM and National Concrete Masonry Association test protocols. Three different normal load arrangements were investigated: (1) flexible airbag, (2) fixed vertical piston, and (3) an adjustable vertical piston. A video-extensometer camera device was used to record block deformations in the vertical plane during testing. The test results showed that the three load arrangements gave similar shear capacity failure envelopes for the frictional block system with flat concrete surfaces. For more typical block systems with concrete shear keys and trailing lips that exhibit dilatant interface shear behavior, or a system with shear pins, the most consistent test results were developed using the flexible airbag arrangement. The results of this paper can be used to guide the selection of the loading arrangement for conventional laboratory modular block shear testing.

References

1.
ASTM Standard D 6683,
2001
, “
Standard Test Method for Determining the Connection Strength Between Segmental Concrete Units and Geosynthetic Reinforcement
,”
Annual Book of ASTM Standards
,
ASTM International
,
West Conshohocken, PA
.
2.
ASTM Standard D 6916-03,
2003
, “
Standard Test Method for Determining the Shear Strength Between Segmental Concrete Units (Modular Concrete Blocks)
,”
Annual Book of ASTM Standards
,
ASTM International
,
West Conshohocken, PA
.
3.
Bathurst
,
R. J.
and
Simac
,
M. R.
,
1993
, “
Laboratory Testing of Modular Unit-Geogrid Facing Connections
,”
Geosynthetic Soil Reinforcement Testing Procedures, ASTM STP 1190
,
Cheng
S. C. J.
, Ed.,
ASTM International
,
West Conshohocken, PA
, pp.
32
48
.
4.
Bathurst
,
R. J.
and
Simac
,
M. R.
,
1994
, “
Geosynthetic Reinforced Segmental Retaining Wall Structures in North America
,” Invited keynote paper,
5th International Conference on Geotextiles, Geomembranes and Related Products
, 6–9 September 1994, Singapore, Vol.
4
, pp.
1275
1298
.
5.
Bathurst
,
R. J.
and
Simac
,
M. R.
,
1997
, “
Design and Performance of the Facing Column for Geosynthetic Reinforced Segmental Retaining Walls
,”
International Symposium on Mechanically Stabilized Backfill
, Denver, Colorado, 6–8 February 1997, Balkema,
Wu
J.
, Ed., pp.
193
208
.
6.
Bathurst
,
R. J.
,
Simac
,
M. R.
, and
Berg
,
R. R.
,
1993
, “
Review of the NCMA Segmental Retaining Wall Design Manual for Geosynthetic-Reinforced Structures
,”
Transp. Res. Rec.
 0361-1981, No.
1414
, pp.
16
25
.
7.
Hatami
,
K.
and
Bathurst
,
R. J.
,
2005
, “
Development and Verification of a Numerical Model for the Analysis of Geosynthetic Reinforced Soil Segmental Walls Under Working Stress Conditions
,”
Can. Geotech. J.
 0008-3674 https://doi.org/10.1139/t05-040, Vol.
42
, No.
4
, pp.
1066
1085
.
8.
Hatami
,
K.
and
Bathurst
,
R. J.
,
2006
, “
A Numerical Model for Reinforced Soil Segmental Walls Under Surcharge Loading
,”
J. Geotech. Geoenviron. Eng.
 1090-0241 https://doi.org/10.1061/(ASCE)1090-0241(2006)132:6(673), Vol.
132
, No.
6
, pp.
673
684
.
9.
Huang
,
C.-C.
and
Wu
,
S.-H.
,
2006
, “
Simplified Approach for Assessing Seismic Displacements of Soil-Retaining Walls. Part I: Geosynthetic-Reinforced Modular Block Walls
,”
Geosynthet. Int.
 1072-6349, Vol.
12
, No.
6
, pp.
219
233
.
10.
National Concrete Masonry Association Segmental Retaining Wall Design Manual
,
1997
2nd ed.,
National Concrete Masonry Association
,
Herndon, VA
,
Collin
J.
, Ed. 289 pp.
11.
Shinoda
,
M.
and
Bathurst
,
R. J.
,
2004
, “
Strain Measurement of Geogrids Using a Video-Extensometer Technique
,”
Geotech. Test. J.
 0149-6115, Vol.
27
, No.
5
, 8 pp.
12.
Simac
,
M. R.
,
Bathurst
,
R. J.
,
Berg
,
R. R.
, and
Lothspeich
,
S. E.
,
1993
,
National Concrete Masonry Association Segmental Retaining Wall Design Manual
, 1st ed.,
National Concrete Masonry Association
,
Herndon, VA
, 250 pp.
13.
Yoo
,
S.
and
Song
,
A. R.
,
2006
, “
Effect of Foundation Yielding on Performance of Two-tier Geosynthetic-reinforced Segmental Retaining Walls: A Numerical Investigation
,”
Geosynthet. Int.
 1072-6349 https://doi.org/10.1680/gein.2006.13.5.181, Vol.
13
, No.
5
, pp.
181
194
.
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