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BODPAVE®85 PAVING GRIDS
'REDUCED DIG'INSTALLATIONGUIDANCE
BENEFITS OF REDUCED DIG
The ‘Reduced Dig’ method of installation for BodPave®85 is suitable for pedestrian and light vehicle applicationswhere firm ground conditions already exist. It is particularly advantageous where there are budgetary limitations,restrictions on excavation due to SSSI conservation and archeological issues or Tree Preservation Orders (TPO).
Gravel & Grassed Surfaces
Minimal site preparation or variation to existing levels
Reduced installation time and costs
Reduced import of materials and disposal of debris
Rapid establishment and usage of site after installation
Compliant with current guidance for SustainableUrban Drainage Systems (SUDS)
Suitable for grass or gravel surfaces
APPLICATIONSLight vehicle parking and access routes
Pedestrian access & Cycle routes
Tree root protection
Golf buggy paths and Tow paths
Caravan and Leisure site access routes
Wheelchair and disabled access (DDA compliant)
Light aircraft parking and taxiways
SITE SUITABILITY
Data Sheet No : SDI / B85PRD09 Issue 2
Where existing groundconditions are firm(ie: CBR > 7%)and free drainingor where a suitablehardcore/stonebase already exists.
Where trafficking isirregular or occasional
Where loads will notexceed that of carsand light vans
Subgradesoil
Tensar TriAx™
TX160 geogridoption
BGT100upper Geotextile filterfabric option
with Grass or GravelBodPave®85
Sand : SoilRootzone orGravel Bedding
DoT (GSB) ‘Type 1’or reduced fines‘Type 3’ Sub-base
BGT100Lower Geotextilelayer option
DESCRIPTION DATA
ProductMaterial Colour optionsPaver dimensions Installed Paver sizeNominal internal cell sizeStructure TypeCell wall thicknessWeight (Nominal)Load bearing capacity (filled)Crush Resistance (unfilled)Basal support & Anti-ShearOpen cell % Connection typeInterlock MechanismChemical resistanceUV resistanceToxicity
BodPave®85100% recycled polyethyleneBlack, Green & Natural500mm x 500mm x 50mm + 35mm ground spike500mm x 500mm (4 grids per m2)Castellated 67mm Plaque & 46mm Round ShapedRigid-walled, flexible semi-closed cell combination2.5mm – 4.4mm1.56 kg/paver - (6.24kg/m2)< 400 tonnes/m2 * < 250 tonnes/m2 *Integral 35mm long Cross & T section ground spikes (18 per paver)Top 92% / Base 75%Overlapping Edge Loop & Cell connectionIntegral self locking Snap-Fit ClipsExcellentHighNon Toxic
Paving Grid Specification
*Research carried out by Sheffield University Department of Mechanical Engineering. (Rennison/Allen March 2009)
FIBERWEB GEOSYNTHETICS LTDBlackwater Trading Estate • The Causeway • Maldon • Essex CM9 4GG • UKTel: +44 (0) 1621 874200 Fax: +44 (0) 1621 874299e.mail: [email protected] • www.terram.com
Note 1: Determination of requirement for placement of an imported sub-base for the application and the required thickness ofthat sub-base material shall be determined by the strength and condition of the existing soils, the extent of allowable excavation andin consideration of the proposed traffic loadings. Standard Bodpave®85 Access Route design may apply. Certain ground conditionsmay require placement of a drainage system within the design.Note 2: Specific site criteria will determine if Tensar TriAx™ TX160 geogrid &/or BGT100 Geotextile are required.Note 3: Maximum advised gradient for traffic applications: 12% (1:8) 7º. Bodpave®85 has specific pegging points if required forsteep slope applications. Pegging is not necessary for standard access route applications.Note 4: BodPave®85 complies with BS8300:2009 - “Design of buildings and their approaches to meet the needs of disabledpeople” - Code of Practice. (ISBN 978 0 580 57419) & Building Regulations Document ‘M’ section 6.
For BodPave®85 product specification please refer to the Design documents for use in Grassed & Gravel Surfaces.
Specific advice on the use of BodPave®85 on steep slopes, drainage suitability and Sustainable Urban Drainage Systems (SUDS)applications, can be obtained from Fiberweb Geosynthetics Ltd.
Tensar & TriAx™ are registered trademarks of Tensar International
BODPAVE®85 PAVING GRIDS - ‘REDUCED DIG’ METHOD
After confirming that the ground conditions are suitably firm and free-draining for this type of ‘reduced dig’application, one of the following methods of installation should be followed.
A. FOR GRASSED SURFACES1. Cut the grass very close to the surface or where specified remove the turf/topsoil to a depth of <100mm
according to local levels. Dispose of all debris. Level the formation layer, lightly consolidate & install drainsas specified.
2. Install edge retention as specified: Either tanalised timber boards, concrete, steel or plastic kerbs as appropriate.3. Place a layer of Tensar TriAx™ TX160 geogrid on the formation layer and ensure it is flat to the surface by
pinning as required. Note: An optional geotextile fabric layer (BGT100) can be placed onto the formation prior to the Tensar TriAx™ TX160 geogrid installation, to prevent migration/contamination (see Note 2).
4. Place a 35 - 50mm thick bedding layer of 10 -20mm diameter angular gravel / aggregate evenly over the geogrid. The geogrid must not be allowed to become exposed above the gravel / aggregate layer.
5. With the 2 sets of edge loop connectors facing in directions of laying, place the BodPave®85 firmly onto the screeded bedding layer so that the ground spikes are pressed fully into the bedding and the base of the paver cells sit flat on the surface. Connect adjacent pavers together by slotting the edge cell connectorsdown into the edge loops (LOOPS ALWAYS LEAD). Pavers are locked in place by the integral snap-fit clips. Progress over the area in rows. Use protective gloves to avoid abrasions.
6. Pavers can be offset by 1 cell increments or cut to fit around obstructions & curves using a hand or power saw. The use of cut-pieces which do not have integral snap-fit connectors should be avoided wherever possible.
7. Fill pavers with the specified propriety rootzone to finished levels of 5-7mm below the top of the cells after settlement. A light whacker plate may be used to consolidate the pavers and settle rootzone fill. Do not overfill the cells. Additional settlement of the rootzone may occur where an open graded bedding is used,& further topping-up may be required.
8. Rootzone fill must be a free-draining, structurally sound propriety blend of sand:soil or sand:compost such as used in sports/golf construction & normally identified as a 60:40 or 70:30 ratio blend. The use of site-wonmaterials or in-situ self-blending is NOT recommended without taking further advice.
9. Carry out a normal seeding, fertilising & watering programme. A very light top dressing may be applied to just cover the seed and to provide adequate germination conditions. Do not overfill the paver cells. Thin-cut or Washed Turf may be rolled into the surface as an alternative if required.
10. The surface may be trafficked immediately, but it is preferable to allow grass to fully establish prior to use.
B. FOR RETAINED GRAVEL SURFACESAfter confirming that the ground conditions are suitably firm and free-draining for this type of ‘reduced dig’application, the following method of installation should be followed.
1. Follow steps 1-6 above. Note: An optional geotextile fabric layer (BGT100) can be placed onto the formation prior to the Tensar TriAx™ TX160 geogrid installation (Step 3), to prevent migration/contamination (see Note 2).
2. Fill the pavers with the specified angular gravel or aggregate. Preferably a clean, evenly graded angularmaterial with a range of 5 - 20mm diameter. Rounded 'pea gravel' is not recommended.
3. Consolidate the surface using a light vibratory whacker plate if required.4. Refill any localised low areas with aggregate and repeat consolidation until satisfied with final compacted finish.5. The surface can be trafficked immediately.
50mm
35-50mm
BodPave®8550mm deep open-celledplastic pavers. Filled with60:40 sand/soil orsand/compost rootzone blend.Then seeded and fertilised.OrFilled with selectedgravel/angularaggregate (5-20mm dia.)
Bedding Layer35-50mm thick layerof 10-20mm diameter,angular gravel orcrushed aggregate.
Optional Tensar TriAx™ TX160geogrid layer and BGT100geotextile (See note 2)
Existing soil profile or stone base (see note 1)
INSTALLATION METHODS
FIBERWEB GEOSYNTHETICS LTDBlackwater Trading Estate • The Causeway • Maldon • Essex CM9 4GG • UKTel: +44 (0) 1621 874200 Fax: +44 (0) 1621 874299e.mail: [email protected] • www.terram.com
The information contained herein is, to the best of our knowledge, accurate in all material respects. However, since the circumstances and conditions in which such informationand the products mentioned herein can be used may vary and are beyond our control, no representation or warranty, express or implied, of any nature whatsoever is orwill be made and no responsibility or liability is or will be accepted by us, any of our affiliates or our or their respective directors, officers, employees or agents in relationto the accuracy or completeness or use of the information contained herein or any such products and any such liability is expressly disclaimed.
Existing SoilExisting Soilmin = Tx
Tx
Tensar TriAx™ TX160 geogrid& optional geofabric BGT100
(see Table 1, 2 & Notes 1-4 & 7)
Drainage options (see Notes 2, 4, 6 & 7)
Sub-base layer. Thickness(Tx) & Type as determined by
Table 1 & Notes 1-5
Subgrade Soil (subsoil)(Refer to Table 1, Chart 1 & Note 5)
50mm
50mm
100-380mm
Vertical edgingboard or kerb
Optional geotextile fabric BGT100 (see Notes 4, 6 & 7)Bedding layer: 35-50mm thick angular aggregate within the range of 5mm - 20mm (BS EN 13242)(see Note 8)
® BodPave 85 paver cells filled with angular aggregate in range 5mm - 20mm (BS EN 13242)
BODPAVE®85 PAVING GRIDS
For Gravel Surfaces
SPECIFICATION, DESIGN& INSTALLATIONGUIDANCE
1. Install edge retention as specified: Either tanalised timber boards, concrete, steel or plastic kerbs as appropriate.
2. Ensure that the gravel/aggregate bedding layer is the correct & uniform thickness, is level & well consolidated.
3. Place the paver units: With the 2 sets of edge loop connectors facing in directions of laying, place BodPave®85 firmly onto the surfaceso that its ground spikes are pressed fully into the bedding and the base of the paver cells sit flat on the bedding layer surface. Connect adjacent pavers together by slotting the edge cell connectors down into the edge loops (LOOPS ALWAYS LEAD) & progress over the area in rows. Pavers are locked in place by snap-fit clips. If paver separation is required, clips can be dislocated using careful, firm handor screwdriver pressure or by gently twisting the paver joints. Use protective gloves to avoid abrasions.
4. Pavers can be offset by 1 cell increments or cut to fit around obstructions & curves using a hand or power saw. The use of cut-pieces which do not have integral snap-fit connectors should be avoided wherever possible.
5. Fill pavers with specified angular decorative gravel/aggregate to finished levels. A light whacker plate may be used to consolidate the pavers and settle the fill. Top up the cells as required after settlement. It is preferable not to overfill the cells. The use of ‘rounded pea gravel’ is not recommended.
6. If the area is to be used for horses, it may be preferable to cover the surface with 50 – 100mm of a fine sand or bark mulch.
7. The surface may be trafficked immediately.
Note 1: If Tensar TriAx™ TX160 geogrid is omitted, the total Granular Sub-Base (GSB) layer thickness (Tx) must be increased by minimum 50%.
Note 2: A‘DoT Type 1’ sub-base may be used provided that an adequate drainage system is installed. Alternatively, a permeable/open-graded (reduced fines) sub-base layer (i.e Type 3) may be specified, e.g. as part of a Sustainable Urban Drainage System (SUDS).
Note 3: If construction traffic axle loads will be greater than 60kN (approx’ 6 Tonnes), minimum sub-base thickness over Tensar TriAx™ TX160 geogrid shall be 150mm. Maximum sub-base particle size should match minimum sub-base thickness but not exceed 75mm diameter. For sub-base thicknesses of around 100mm, a minimum 37.5mm particle size should be adopted to allow effective installation of Tensar TriAx™ TX160 geogrid
Note 4: Where drains are omitted and a 'reduced fines' sub-base is specified for SUDS, this may be covered with a geotextile fabric(i.e. BGT100) to avoid contaminants leaching into the sub-base.
Note 5: Specific advice on CBR% strengths, ground conditions and construction over weak ground with a CBR less than 1% is available from Boddingtons Limited. CBR% = California Bearing Ratio, a measurement of subgrade soil strength.
Note 6: Typical standard drainage detail: 100mm diameter perforated pipe drains laid at minimum gradient 1:100, bedded on gravel in trench backfilled with ‘DoT Type A’ drainage aggregate, trench covered &/or wrapped with a geotextile fabric (i.e BGT100), pipes leading to a suitable outfall or soakaway. Drains installed down centre or one edge of areas up to 5m wide. Wider areas may require additionallateral drains at 5m - 10m centres. Drainage design to be determined by the specifier based on specific site conditions.
Note 7: Drainage for a Sustainable Urban Drainage System (SUDS) application will vary according to the site but generally omits the requirementfor extensive pipe & trench drainage systems within the sub-base layer and may require an additional layer of BGT100 geotextile fabric at base of construction.
Note 8: The selected gravel fill & bedding should be clean, free-draining, angular shaped material in the specified size range.
Note 9: Maximum advised gradient for traffic applications: 12% (1:8) 7º. Bodpave®85 has specific pegging points if required for steep slope applications. Pegging is not necessary for standard access route applications.
Note 10: BodPave®85 complies with BS8300:2009 - “Design of buildings and their approaches to meet the needs of disabled people” - Code of Practice. (ISBN 978 0 580 57419) & Building Regulations Document ‘M’ section 6.
Specific advice on the use of BodPave®85 on steep slopes, drainage suitability and Sustainable Urban Drainage Systems (SUDS) applications, can be obtained from Fiberweb Geosynthetics Limited.
BODPAVE®85 INSTALLATION METHOD
Typical Construction Profile
Data Sheet No : SDI / B85PGV09 Issue 2
DESIGN NOTES
FIBERWEB GEOSYNTHETICS LTDBlackwater Trading Estate • The Causeway • Maldon • Essex CM9 4GG • UKTel: +44 (0) 1621 874200 Fax: +44 (0) 1621 874299e.mail: [email protected] • www.terram.com
Tensar & TriAx™ are registered trademarks of Tensar International
BODPAVE®85 PAVING GRIDS
Chart 1: Field guidance for estimating sub-grade strengths
ConsistencyIndicator Strength
Tactile(feel)
Visual(observation)
Mechanical(test)
CBR
SPT % kN/sqm
CU
Very Soft
Soft
Medium
Firm
Stiff
Hand sample squeezesthrough fingers
Man standing willsink >75mm
<2 <1 <25
2-4 Around 1 Around 25
4-8 1-2 25-40
8-15 2-4 40-75
15-30 4-6 75-150
Man walkingsinks 50-70mm
Man walkingsinks 25mm
Utility truck ruts10-25mm
Loaded constructionvehicle ruts by 25mm
Easily moulded byfinger pressure
Moulded by moderatefinger pressure
Moulded by strongfinger pressure
Cannot be moulded butcan be indented by thumb
Table 1: Typical Sub-base Thickness (Tx) Requirements - refer to construction profile overleaf
APPLICATION/LOADCBR (%) STRENGTH OF
SUBGRADE SOIL(see Chart 1)
(TX) DoT SUB-BASE THICKNESS (mm)
(see Notes 1 - 5)
TENSAR TriAx™
GEOGRID (see Notes 1 - 3)
Fire trucks, Coachesand occasional HGVaccess
≥ 6= 4 < 6= 2 < 4= 1 < 2
100120190380
TX160TX160TX160TX160
Light vehicle accessand overspill carparking
≥ 6= 4 < 6= 2 < 4= 1 < 2
100100135260
TX160TX160 TX160TX160
Data Sheet No : SDI / B85PGV09 Issue 2
DESCRIPTION DATA
Bedding Layer
Paver fill
Sub-base type
Sub-base reinforcement
Geotextile Fabric
35 - 50mm thick of 5–20mm clean, angular aggregate (BSEN13242)
To top of cells using 5–20mm clean, angular aggregate (BSEN13242)
DoT Type 1 or a modified permeable Type 3 sub-base (Table 1 & Notes 1-5)
Tensar TriAx™ TX160 geogrid (Table 1 & Notes 1-4 & 7)-Specification on request.
BGT100 Geotextile where appropriate
ProductMaterial Colour optionsPaver dimensions Installed Paver sizeNominal internal cell sizeStructure TypeCell wall thicknessWeight (Nominal)Load bearing capacity (filled)Crush Resistance (unfilled)Basal support & Anti-ShearOpen cell % Connection typeInterlock MechanismChemical resistanceUV resistanceToxicity
BodPave®85100% recycled polyethyleneBlack, Green & Natural500mm x 500mm x 50mm + 35mm ground spike500mm x 500mm (4 grids per m2)Castellated 67mm Plaque & 46mm Round ShapedRigid-walled, flexible semi-closed cell combination2.5mm – 4.4mm1.56 kg/paver - (6.24kg/m2)< 400 tonnes/m2 *< 250 tonnes/m2 *Integral 35mm long Cross & T section ground spikes (18 per paver)Top 92% / Base 75%Overlapping Edge Loop & Cell connectionIntegral self locking Snap-Fit ClipsExcellentHighNon Toxic
Table 2: Paving Grid Specification
This field guide is provided as an aid to assessing the mechanical stabilisation requirements in commonly encountered site conditions. FiberwebGeosynthetics Limited accepts no responsibility for any loss or damage resulting from the use of this guide.
*Research carried out by Sheffield University Department of Mechanical Engineering. (Rennison/Allen March 2009)
FIBERWEB GEOSYNTHETICS LTDBlackwater Trading Estate • The Causeway • Maldon • Essex CM9 4GG • UKTel: +44 (0) 1621 874200 Fax: +44 (0) 1621 874299e.mail: [email protected] • www.terram.com
The information contained herein is, to the best of our knowledge, accurate in all material respects. However, since the circumstances and conditions in whichsuch information and the products mentioned herein can be used may vary and are beyond our control, no representation or warranty,express or implied, of any nature whatsoever is or will be made and no responsibility or liability is or will be accepted by us, any of our affiliates or our or theirrespective directors, officers, employees or agents in relation to the accuracy or completeness or use of the information contained herein or any such productsand any such liability is expressly disclaimed..
BODPAVE®85 PAVING GRIDS
SPECIFICATION, DESIGN& INSTALLATIONGUIDANCE
Optional verticaledging board or kerb
BGT100 Geotextile fabric (see Notes 4, 6 & 7)
BodPave 85 paver cells filled to within 5-7mm ®
of the surface with 60:40 rootzone (see Note 8)then seeded or turfed and fertilised Bedding layer: 50-70mm thick
consolidated 60:40rootzone (see Note 8).
Existing SoilExisting Soilmin = Tx
Tx
Tensar TriAx™ TX160 geogrid& optional BGT100 Geotextile fabric
(see Tables 1, 2 & Notes 1-4 & 7)
Drainage options (see Notes 2, 4, 6 & 7)
Sub-base layer. Thickness(Tx) & Type as determined by
Table 1 & Notes 1-5
Subgrade Soil (subsoil)(Refer to Table 1, Chart 1 & Note 5)
50mm
50-70mm
100-380mm
1. Install edge retention as specified: Either tanalised timber boards, concrete, steel or plastic kerbs as appropriate.2. Ensure that the sand:soil rootzone bedding layer is the correct & uniform thickness, is level & well consolidated.3. Place the paver units: With the 2 sets of edge loop connectors facing in directions of laying, place BodPave®85 firmly onto the surface
so that its ground spikes are pressed fully into the bedding and the base of the paver cells sit flat on the bedding layer surface. Connectadjacent pavers together by slotting the edge cell connectors down into the edge loops (LOOPS ALWAYS LEAD) & progress over the area in rows. Pavers are locked in place by snap-fit clips. If paver separation is required, clips can be dislocated using careful, firm hand or screwdriverpressure or by gently twisting the paver joints. Use protective gloves to avoid abrasions.
4. Pavers can be offset by 1 cell increments or cut to fit around obstructions & curves using a hand or power saw. The use of cut-pieces which do not have integral snap-fit connectors should be avoided wherever possible.
5. Fill pavers with specified propriety rootzone to finished levels: 5-7mm below top of the cells after settlement. A light whacker plate may be used to consolidate the pavers and settle rootzone fill. Do not overfill or over consolidate.
6. Carry out a normal seeding, fertilising & watering programme. A light top dressing may be applied to just cover the seed and to provideadequate germination conditions. Do not overfill the paver cells. Thin-cut or Washed Turf may be lightly rolled into the surface as analternative if required.
7. The surface may be trafficked immediately for critical access purposes, but it is preferable to allow grass to fully establish prior to use.
Note 1: If Tensar TriAx™ TX160 geogrid is omitted, the total Granular Sub-Base (GSB) layer thickness (Tx) must be increased by minimum 50%.Note 2: A‘DoT Type 1’ sub-base may be used provided that an adequate drainage system is installed. Alternatively, a permeable/open-graded
(reduced fines) sub-base layer (i.e Type 3) may be specified, e.g. as part of a Sustainable Urban Drainage System (SUDS). Note 3: If construction traffic axle loads will be greater than 60kN (approx’ 6 Tonnes), minimum sub-base thickness over Tensar TriAx™ TX160
geogrid shall be 150mm. Maximum sub-base particle size should match minimum sub-base thickness but not exceed 75mm diameter. For sub-base thicknesses of around 100mm, a minimum 37.5mm particle size should be adopted to allow effective installation of Tensar TriAx™ TX160 geogrid.
Note 4: Where drains are omitted and a 'reduced fines' sub-base is specified for SUDS this must be covered with either a geotextile fabric(i.e. BGT100) and/or a clean, suitably graded gravel blinding to avoid the bedding layer leaching into the sub-base.
Note 5: Specific advice on CBR% strengths, ground conditions and construction over weak ground with a CBR less than 1% is available from Boddingtons Limited. CBR% = California Bearing Ratio, a measurement of subgrade soil strength.
Note 6: Typical standard drainage detail: 100mm diameter perforated pipe drains laid at minimum gradient 1:100, bedded on gravel in trench backfilled with ‘DoT Type A’ drainage aggregate, trench covered &/or wrapped with a geotextile fabric (i.e BGT100), pipes leading to a suitable outfall or soakaway. Drains installed down centre or one edge of areas up to 5m wide. Wider areas may require additionallateral drains at 5m - 10m centres. Drainage design to be determined by the specifier based on specific site conditions.
Note 7: Drainage for a Sustainable Urban Drainage System (SUDS) application will vary according to the site but generally omits the requirement for extensive pipe & trench drainage systems within the sub-base layer and may require an additional layer of BGT100 geotextile fabricat base of construction.
Note 8: Rootzone bedding and paver fill must be a free-draining, structurally sound propriety blend of sand:soil or sand:compost such as used in sports/golf construction & normally identified as a 60:40 or 70:30 ratio blend. The use of site-won materials or in-situ self-blending is NOT recommended without taking further advice.
Note 9: Maximum advised gradient for traffic applications: 12% (1:8) 7º. Bodpave®85 has specific pegging points if required for steep slope applications. Pegging is not necessary for standard access route applications.
Note 10: BodPave®85 complies with BS8300:2009 - “Design of buildings and their approaches to meet the needs of disabled people” - Code of Practice. (ISBN 978 0 580 57419) & Building Regulations Document ‘M’ section 6.
Specific advice on the use of BodPave®85 on steep slopes, drainage suitability and Sustainable Urban Drainage Systems (SUDS)applications, can be obtained from Fiberweb Geosynthethics Ltd.
BODPAVE®85 INSTALLATION METHOD
For Grassed SurfacesTypical Construction Profile
DESIGN NOTES
Data Sheet No : SDI / B85PGS09 Issue 2
FIBERWEB GEOSYNTHETICS LTDBlackwater Trading Estate • The Causeway • Maldon • Essex CM9 4GG • UKTel: +44 (0) 1621 874200 Fax: +44 (0) 1621 874299e.mail: [email protected] • www.terram.com
Tensar & TriAx™ are registered trademarks of Tensar International
BODPAVE®85 PAVING GRIDS
Chart 1: Field guidance for estimating sub-grade strengths
ConsistencyIndicator Strength
Tactile(feel)
Visual(observation)
Mechanical(test)
CBR
SPT % kN/sqm
CU
Very Soft
Soft
Medium
Firm
Stiff
Hand sample squeezesthrough fingers
Man standing willsink >75mm
<2 <1 <25
2-4 Around 1 Around 25
4-8 1-2 25-40
8-15 2-4 40-75
15-30 4-6 75-150
Man walkingsinks 50-70mm
Man walkingsinks 25mm
Utility truck ruts10-25mm
Loaded constructionvehicle ruts by 25mm
Easily moulded byfinger pressure
Moulded by moderatefinger pressure
Moulded by strongfinger pressure
Cannot be moulded butcan be indented by thumb
This field guide is provided as an aid to assessing the mechanical stabilisation requirements in commonly encountered site conditions. FiberwebGeosynthethics Ltd accepts no responsibility for any loss or damage resulting from the use of this guide.
Table 1: Typical Sub-base Thickness (Tx) Requirements - refer to construction profile overleaf
APPLICATION/LOADCBR (%) STRENGTH OF
SUBGRADE SOIL(see Chart 1)
DESCRIPTION DATA
(TX) DoT SUB-BASE THICKNESS (mm)
(see Notes 1 - 5)
TENSAR TriAx™
GEOGRID (see Notes 1 - 3)
Fire trucks, Coachesand occasional HGVaccess
≥ 6= 4 < 6= 2 < 4= 1 < 2
100120190380
TX160TX160TX160TX160
Light vehicle accessand overspill carparking
Bedding Layer
Paver fill (seed bed)
Grass seed or turf
Fertiliser
Sub-base type
Sub-base reinforcement
60:40 rootzone (see Note 8) : 50-70mm thick
60:40 rootzone (see Note 8): 43-45mm thick
35g/m2 amenity blend low maintenance seed or turf as required
Pre-seed fertiliser followed up with appropriate seasonal fertiliser
DoT Type 1 or a modified permeable Type 3 sub-base (Table 1 & Notes 1-5)
Tensar TriAx™ TX160 geogrid (Table 1 & Notes 1-4 & 7)-Specification on request.
≥ 6= 4 < 6= 2 < 4= 1 < 2
ProductMaterial Colour optionsPaver dimensions Installed Paver sizeNominal internal cell sizeStructure TypeCell wall thicknessWeight (Nominal)Load bearing capacity (filled)Crush Resistance (unfilled)Basal support & Anti-ShearOpen cell % Connection typeInterlock MechanismChemical resistanceUV resistanceToxicity
BodPave®85100% recycled polyethyleneBlack, Green & Natural500mm x 500mm x 50mm + 35mm ground spike500mm x 500mm (4 grids per m2)Castellated 67mm Plaque & 46mm Round ShapedRigid-walled, flexible semi-closed cell combination2.5mm – 4.4mm1.56 kg/paver - (6.24kg/m2)< 400 tonnes/m2 *< 250 tonnes/m2 *Integral 35mm long Cross & T section ground spikes (18 per paver)Top 92% / Base 75%Overlapping Edge Loop & Cell connectionIntegral self locking Snap-Fit ClipsExcellentHighNon Toxic
100100135260
TX160TX160TX160TX160
Table 2: Paving Grid Specification
Data Sheet No : SDI / B85PGS09 Issue 2
*Research carried out by Sheffield University Department of Mechanical Engineering. (Rennison/Allen March 2009)
The information contained herein is, to the best of our knowledge, accurate in all material respects. However, since the circumstances and conditions in whichsuch information and the products mentioned herein can be used may vary and are beyond our control, no representation or warranty,express or implied, of any nature whatsoever is or will be made and no responsibility or liability is or will be accepted by us, any of our affiliates or our or theirrespective directors, officers, employees or agents in relation to the accuracy or completeness or use of the information contained herein or any such productsand any such liability is expressly disclaimed.
FIBERWEB GEOSYNTHETICS LTDBlackwater Trading Estate • The Causeway • Maldon • Essex CM9 4GG • UKTel: +44 (0) 1621 874200 Fax: +44 (0) 1621 874299e.mail: [email protected] • www.terram.com