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Retaining wall system for geogrid reinforced block walls, TENAX T-Block




Retaining wall system for geogrid reinforced block walls


The T-BLOCK unit design (by Geoblock) utilised by the system has been successful and proven since 1990 in a variety of wall applications from bridge abutments wing walls, railway platform extensions, water facing walls and many other applications, all further demonstrating its versatility.

The integrated mono-oriented geogrid (by TENAX) is manufactured in a continuous process with cross directional bars homogeneously connected to the high tensile longitudinal strands to form a monolithic structure.

Finally, a 100% mechanical connection technology delivered by the simple TENAX patented T-CLIP connector, attaches securely to the TENAX geogrid and is locked into place between the blocks.





Retaining wall system

The reinforced soil technique is a construction method that is thousands of years old and has in the past used different types of soil reinforcing materials.


Today’s geosynthetics, in particular the use of geogrids and the structures designed to use them, are the subject of well researched mathematical solutions. Several types of construction systems utilise the concepts of soil reinforcement.


Amongst them, are soil reinforced block wall systems that make use of concrete blocks at the face and incorporate geogrids as reinforcing elements. These systems have proven to be extremely viable from technical, aesthetic and economic standpoints.

The T-BLOCK Retaining Wall System is unique and can be considered as a state of the art system, developed from the joint cooperation between two of the most experienced and qualified companies in the market: TENAX and Geoblock.


The cooperation between the two companies has allowed the development of a unique system that delivers the maximum possible benefits and advantages when combining the use of geogrid reinforcement with concrete block components.

The T-BLOCK Retaining Wall System offers the best block, the best geogrid and the best connection system, fully supported by a comprehensive professional design approach.



The benefits

The T-Block Retaining Wall System offers many advantages to clients, specifiers and contractors when compared with traditional methods such as reinforced concrete in retaining wall applications:

  • Proven and recognised reinforced soil technique with numerous worldwide successful projects;
  • Possibility of using site-won backfill, therefore providing further savings;
  • Fast and easy to construct;
  • Area behind wall can be trafficked straight away;
  • Structures designed for 120 years life;
  • No practical height limitations;
  • Simple construction method that requires no specialist skills;
  • Large cost savings over traditional reinforced concrete solutions;
  • Can be designed for all surcharge loading applications;
  • Variety of facing types to suit client requirements;
  • Better resistance to dynamic effects arising from seismic activity.

Retaining wall system for geogrid reinforced block walls TENAX T-Block

retaining wall with concrete block facing photo archive
TENAX T-block
Photo Archive


TENAX T-BLOCK - Applications


Stabilisation of landslides

Construction of retaining walls

Slope crest enlargement

Construction of road and railway embankments



TENAX T-BLOCK - Installation guides


TENAX T-Block Retaining wall system for geogrid reinforced block walls


retaining wall system
South Korea - Chunsugyo-Saebeari Highway.

Geoblock segmental retaining wall System


Geogrid reinforced wing wall
St. Petersburg, Russia ringroad:
Geogrid reinforced wing wall.

TENAX TT geogrids connection strength
Characteristics u.m. TT 045 TT 060 TT 090 TT 120 TT 160
Connection Efficiency % 195 155 125 120 100
Long Term Design Strength kN/m 21,2 28,3 42,4 56,5 75,4



The components of T-Block System
The T-BLOCK Retaining Wall System features a modular precast concrete block facing unit, a polymeric T-CLIP connector and layers of TENAX TT geogrid reinforcement material.

TENAX TT mono-oriented geogrids

Tenax geogrid
The TENAX TT mono-oriented geogrids are two-dimensional polymer structures manufactured from HDPE (High Density Polyethylene) by a process of extrusion and mono-directional drawing. The geogrids are certified for the reinforcement of the soil mass behind the wall by major international organisations. Soil and aggregate interlock within the geogrid openings, which confine the soil, limit its relative displacements and increase the soil’s shear stress resistance. The soil/geogrid structure integrates the fill soil’s high compressive strength with the geogrid’s tensile strength, thus creating a material having greater rigidity and stability and improving the structure’s resistance to static and dynamic loads.



The T-block wall units

the block wall unitThe T-BLOCK units are high strength precast concrete modular facing units with a compressive strength of 35 kN. Each T-Block unit has a face area of 0,06 m2 (150 x 400 mm x 240 mm thickness) and consists of a groove formed in the bottom of the block and a locating rib (or tongue) formed in the top of the unit.


This “tongue and groove” connection allows many T-BLOCK units to be securely interconnected, thereby forming a locked vertical face.


The concrete units have a minimum compressive strength of 35kN. Moisture absorption is less then 5%. Pigments used in the concrete are pure iron oxides or, if green or blue, chrome oxides.
Plasticizers and water proofer may be used, but sodium accelerants are not recommended.

Aimed at satisfying the most demanding markets worldwide aesthetically and technically, it’s possible to deliver a range of existing blocks or custom-design blocks for specific market needs.


The T-clip connectors

One of the most critical areas for retaining wall structures is the connection strength between the t-clip connectorsgeogrid reinforcement and the block wall facing units.
The TENAX patented T-CLIP connectors deliver a 100% effective mechanical connection with the geogrids and the T-BLOCK units to form a totally integrated system.

The fill material

Typically constructed using compacted granular backfill, selected site-won or imported material. There is also the opportunity to use carefully selected recycled or stabilized backfills within the reinforced soil mass, thereby dealing with environmental pressures concerning the use of natural resources.



Connection strength
The design of the T-BLOCK connection system is the result of seventeen years experience of making mechanical connections between HDPE geogrids and segmental concrete blocks.


This experience with loose connectors, grids and blocks led to increasing the simplicity by making smaller connectors which clip onto the geogrids thus making two parts into one. This enables the grid with the connectors to be laid on the blocks and secured in position with the next layer of blocks very easily.

connection strength

The mechanical connection is important as it allows the system to be used in seismic areas and optimises the design by allowing the full long term strength of the geogrids to be used in the geotechnical design of the structure. By using a straight through path for the geogrids the blocks sit level on the geogrids and so eliminates rotation of the wall units common with some other systems.

walls for clover leaf interchange
The walls for this clover leaf interchange were built with blocks designed by Geoblock and produced locally.


retaining wall system on road projects
Dubai - United Arab Emirates
Materials and design for the landscaping and structures on major road projects.


geogrid reinforced block walls
Seoul, Korea

This wall shows the flexibility of the T-BLOCK system that maximises the use of a small busy urban area. The strikingly curved, multi-layered wall geometry provides the local residents with ample parking facilities and aesthetically pleasing recreational areas.



wide range of styles
Available in a wide range of face styles and colours, the T-Block system can be built in a variety of architectural effects and finishes to match or complement the surrounding built environment.

Wall details
muro e raccordo con scala muro e raccordo con scarpata verde fondazione su rampa inclinata
muro con tratti curvi muro con spigoli vivi
raccordo con terra rinforzata

TENAX Corporation
4800 East Monument Street, Baltimore, Maryland 21205, USA

Phone: 410-522-7000 • Toll free phone: 800-356-8495
Fax: 410-522-7015 • Toll free fax: 877-836-2987

Manufacturer since 1987