Geogrids are open polymer structures formed by bonding polymer strips at cross points. They are commonly made of materials like polyester, polyvinyl alcohol, and polypropylene. The major function of geogrids is to reinforce soils and resist tensile forces. The first geogrids were invented in the UK in 1982 and brought to North America by Tensar Corporation. Geogrids are now used to reinforce road bases, retaining walls, bridges, and reinforced soil slopes due to their ability to increase construction speed and provide proper reinforcement at a lower cost.
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Use of geogrids as reinforcement in road construction
1. GEOGRID AS A SOIL
REINFORCEMENT
PRESENTED BY :
- PRATYUSHA
BANDYOPADHYAY
CIVIL-204
CALCUTTA INSTITUTE
OF ENGINEERING AND MANAGEMENT
GUIDED BY :
- SSI SIR
2. INTRODUCTION
Geogrids are nothing but
the open structures
formed by bonding
polymer strips at their
cross point. Commonly
made of polymer
materials, the major
function of the
geogrids is in the area
of reinforcement to
resist the tensile force.
3. HISTORICAL EVOLUTION
The first and original geogrids ( called unitized or
homogeneous types) were invented by Dr. Frank Brian
Mercer in the United Kingdom at Nelton Ltd. and were
brought in 1982 to North America by the Tensar
Corporation.
The second category of geogrids are more flexible geogrids
using bundles of polyethylene-coated polyester fibres were
first developed by ICI Linear Composites LTD. in the United
Kingdom around 1980.
The third category of geogrids are made by laser or
ultrasonically bonding together polyester or polypropylene
rods in a grid like pattern.
11. ADVANTAGES
1. It is cost saving material.
2. It increases construction
speed.
3. Proper reinforcement is
achieved.
4. Improved quality.
12. REFERENCES
1. http://en.wikipedia.org/wiki/Geogrid
2. Müller, W. W.; Saathoff, F. (2015).
"Geosynthetics in geoenvironmental
engineering". Science and Technology of
Advanced Materials 16 (3):
034605. doi:10.1088/1468-
6996/16/3/034605. edit
3. Ward, I. M. (1984) “The Orientation of
Polymers to Produce High Performance
Materials” Proceedings of the Symposium on
Polymer Grid Reinforcement in Civil
Engineering,Institution of Civil Engineers, UK.