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GEOSYNTHETICS
AFRICA

Strip Bonded Geogrids

Strip-bonded geogrids are formed from parallel arrays of polymeric geostrips bonded at their cross-over junctions, each strip carrying a core of high-tenacity polyester filament yarn tendons inside a polyethylene protective sheath. Available from 100 to 1400 kN/m ultimate tensile strength, with long-term design strengths to 929 kN/m over a 120-year design life, they carry loads beyond the range of extruded and coated planar geogrids - basal reinforcement of embankments over soft ground, tall reinforced soil walls, and bridge abutments.

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Technical Specification of Strip Bonded Geogrids

TechLink strip-bonded geogrids are high-performance geosynthetics engineered for soil reinforcement applications demanding high to ultra-high tensile strength. The product consists of two sets of polymeric geostrips - one set of parallel strips aligned in the longitudinal direction, another aligned in the cross-direction - bonded to each other at the cross-over junctions to form a stable grid structure. This construction differs fundamentally from extruded, punched-and-drawn or coated woven geogrids, and it is what allows the range to reach tensile strengths well beyond the practical ceiling of planar geogrid manufacture.

The longitudinal strips comprise an inner core of tensile elements consisting of high-tenacity polyester filament yarn tendons within an outer protective sheath of polyethylene. The polyester yarns are selected for high molecular weight and low carboxyl end group count, which governs long-term resistance to hydrolysis and therefore the durability reduction factor applied in design. The polyethylene sheath carries no load; its function is to protect the tendons from mechanical damage during placement and compaction, resist weathering and chemical attack, and provide frictional interaction with the surrounding fill.

Reinforcement design is governed by long-term design strength rather than ultimate tensile strength. LTDS is obtained by dividing the characteristic short-term tensile strength by reduction factors for creep rupture, installation damage and durability, following ISO/TR 20432 - the methodology also adopted by BS 8006-1, IS 17372 and IS 17373, and referenced by IRC:SP:102. For TechLink at a 120-year design life, 20°C and pH 5–9, the published factors are 1.38 for creep, 1.03 for installation damage in coarse and sandy gravels or 1.01 in silty sand, and 1.06 for durability. Applied to the grade range, this yields long-term design strengths from 66 to 929 kN/m in gravels and 68 to 948 kN/m in sands.

The range suits structures where required reinforcement strength exceeds what conventional planar geogrids can deliver, or where a high-modulus, low-creep reinforcement is needed to control deformation. Principal applications are basal reinforcement of embankments over soft or compressible ground, including piled and column-supported embankments; tall reinforced soil walls and bridge abutments; steepened reinforced soil slopes; and load transfer platforms over ground improvement elements. Cross-direction strength is nominal at 1 kN/m, so the product is designed as uniaxial reinforcement and must be laid with the machine direction aligned to the principal tensile demand.

Typical Values for GEOGRIDS INTERLAYERS

Tensile Strength
100 – 1400 kN/m
LTDS (120 yr)
up to 948 kN/m
Elongation
10% ±2
Roll Width
up to 6m

Properties & Dimensions

GradeUTS (MD), kN/mLTDS Gravels, kN/mLTDS Sands, kN/mRoll Length, m
TL 1001006668200
TL 200200133135200
TL 300300199203200
TL 400400265271130
TL 500500332338100
TL 600600398406100
TL 70070046547450
TL 80080053154150
TL 90090059760950
TL 1000100066467750
TL 1100110073074550
TL 1200120079681250
TL 1300130086388050
TL 1400140092994850
Download Full Technical Datasheet for Strip Bonded Geogrids (PDF)

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Three Questions To Ask Before You Order

1.What is a strip-bonded geogrid?
A strip-bonded geogrid is formed from two sets of polymeric geostrips — one set of parallel strips running longitudinally, another running in the cross-direction — bonded to each other at their cross-over junctions to form a stable grid. Each longitudinal strip carries a core of high-tenacity polyester filament yarn tendons inside a protective polyethylene sheath. It differs fundamentally from extruded, punched-and-drawn or coated woven geogrids, and this construction is what allows tensile strengths well beyond the range of planar geogrid manufacture.
2.What is LTDS and why does it matter more than tensile strength?
Long-term design strength is the strength a reinforcement can safely carry for its full design life, and it is what reinforced soil design is actually based on. It is obtained by dividing the characteristic short-term tensile strength by reduction factors for creep rupture, installation damage and durability. Ultimate tensile strength alone tells a designer very little, because two products with identical UTS can deliver very different LTDS depending on their reduction factors. Always compare reinforcement on LTDS at the project's design life, temperature and pH.
3.How is long-term design strength calculated?
LTDS equals the characteristic tensile strength divided by the product of the reduction factors for creep, installation damage and durability. The methodology is set out in ISO/TR 20432 and adopted identically by BS 8006-1 Annex A, IS 17372 and IS 17373, and referenced by IRC:SP:102. Characteristic tensile strength is the minimum average roll value — the mean less two standard deviations, a 95% confidence limit. If a specification names a particular standard, that standard's reduction factors govern.
4.What tensile strengths are available?
The range runs from 100 to 1400 kN/m ultimate tensile strength in the machine direction, giving long-term design strengths from 66 to 929 kN/m in gravels and 68 to 948 kN/m in sands at 120 years, 20°C and pH 5 to 9. Cross-direction strength is nominal at 1 kN/m across all grades, since the transverse strips maintain grid geometry rather than carrying load.
5.When should I use strip-bonded geogrid instead of a planar geogrid?
Above roughly 400 kN/m, extruded and punched-and-drawn geogrids are generally unavailable and strip-bonded construction becomes the practical option. Below that the ranges overlap, and selection turns on creep performance, installation damage resistance and stiffness rather than strength alone. Strip-bonded geogrid is also preferred where a high-modulus, low-creep reinforcement is needed to limit long-term deformation, or where the design life pushes creep reduction factors on alternative products to uneconomic levels.
6.Does it need to be laid in a particular direction?
Yes, and this matters. Cross-direction strength is 1 kN/m, so the product functions as uniaxial reinforcement and must be laid with the machine direction aligned to the principal tensile demand - perpendicular to the wall face in a reinforced soil wall, or along the direction of spreading in a basal reinforcement application. Rolls laid across the wrong axis produce a structure with effectively no reinforcement. Confirm orientation against the design drawings before placement begins.
7.What are the reduction factors?
At 120 years, 20°C and pH 5 to 9: creep 1.38, durability 1.06, and installation damage 1.03 in coarse and sandy gravels or 1.01 in silty sand. The creep factor reduces at shorter design lives. These values are derived from testing at independent accredited laboratories and can be reproduced by a checking engineer from the published datasheet.
8.How does polyester perform over a long design life?
The tendons are high-tenacity polyester filament yarn selected for high molecular weight and low carboxyl end group count, which together govern resistance to hydrolysis - the principal long-term degradation mechanism for polyester in soil. This is why the durability reduction factor is 1.06 at 120 years across the pH 5 to 9 range typical of civil engineering fills. Outside that pH range, or at elevated service temperatures, factors should be reassessed against project conditions.
9.What are the site handling requirements?
Cover the reinforcement within one day of placement. Weathering resistance is good and short exposure has minimal effect, but the datasheet reduction factors assume prompt covering and prolonged exposure erodes that assumption. Avoid dragging rolls over sharp aggregate, place and spread fill without tracking directly on uncovered reinforcement, and compact in lifts per the design. Rolls come up to 6 m wide with lengths from 50 to 200 m depending on grade.
10.What information do you need to recommend a grade?
Structure type and height or embankment geometry, backfill material and its particle size, design life, service temperature and fill pH, plus the governing design code. From these the required LTDS can be established and the grade selected with the correct reduction factors applied. Full design data including pullout and direct sliding coefficients from independent laboratory testing is available to support your design and approvals submission.

Specification For The Design, Installation Of Strip Bonded Geogrids

Prepare the formation level, remove sharp protrusions and any material that could damage the reinforcement, and confirm the bearing layer meets the design assumptions. Reinforcement is laid with the machine direction aligned to the principal tensile demand - perpendicular to the wall face on reinforced soil walls, and along the direction of spreading on basal reinforcement. This orientation is critical rather than preferential: cross-direction strength is nominal at 1 kN/m, so a roll laid across the wrong axis leaves the structure effectively unreinforced. Check roll orientation against the design drawings before the first lift is placed, and re-check after any change of crew or roll. Adjacent rolls are laid to the overlap or joint detail shown on the drawings; strip-bonded geogrid is not spliced by overlapping alone where load transfer across the joint is required, so follow the specified connection or bodkin detail.

Place fill by end-tipping onto previously placed material and spreading forward over the reinforcement, never by tipping directly onto it. Maintain a minimum cover thickness before any plant tracks over the reinforcement — typically 150 to 200 mm depending on fill type and plant weight — and avoid sharp turning, braking or acceleration on the first lift. Compact in lifts to the specified density using equipment appropriate to the fill. The published installation damage reduction factors of 1.03 in coarse and sandy gravels and 1.01 in silty sand were derived from full-scale field testing that simulates correct placement; departing from good practice, particularly with large angular aggregate, produces higher damage than the design assumed and erodes the strength the structure was designed for.

Cover the reinforcement within one day of placement. Weathering resistance is good and brief exposure has little effect, but the datasheet reduction factors assume prompt covering, and prolonged exposure invalidates that assumption. Where reinforcement connects to a facing system - precast concrete panels, segmental blocks, welded wire mesh or wrap-around - the connection is a designed structural element and must be installed exactly per the drawings, since connection capacity rather than reinforcement strength frequently governs. Record grade, roll number, layer level, orientation and date for each layer placed, together with any observed damage and its remediation. These records form the acceptance documentation and are routinely requested at handover on reinforced soil structures.

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