BEFORCE PH 55 Polypropylene Woven Fabrics

Geosynthetics

General information of BEFORCE PH 55 Polypropylene Woven Fabrics

General information

A common problem encountered in the construction of traffic routes is the inadequate load-bearing capacity of the subgrade. In order to permanently increase the load-bearing capacity, either the loads can be transferred to sufficiently load-bearing layers at a deeper level (deep foundations) or suitable measures can be taken to improve the existing subgrade.

Traditional soil stabilisation methods such as soil replacement or soil treatment using lime are very laborious and costly and are not always possible. This is where BEFORCE PH 55 Woven Geotextile offers a simple and cost-effective solution for improving the load-bearing capacity of bound or unbound base layers.

The woven tape fabric is manufactured by cutting narrow strips from a polypropylene membrane and then stretching the strips and weaving them together. The result is a uniaxial or biaxial geotextile in the longitudinal (warp) and lateral (weft) directions.

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Funtionality of the BEFORCE PH 55 Polypropylen Woven Fabrics

Functions

One of the great advantages of BEFORCE PH 55 Polypropylene Woven Fabric is that it combines the functions of “separating” and “reinforcing” in a single product.

Separating

The tightly interwoven structure of the BEFORCE PH 55 Polypropylene Woven Fabric ensures effective separation of the different soil layers. This characteristic distinguishes woven geotextiles from geogrids, which only reinforce the soil and therefore require the use of an additional separating layer (such as a non-woven geotextile) in certain applications.

The standard product BEFORCE PH 55 exceeds the requirements for geotextile robustness class 5. This makes it a particularly robust material that provides a low-cost solution in comparison to the use of a combination of geogrids and non-woven fabrics.

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Reinforcement

The geosynthetic reinforcing layer distributes the applied loads across a wider area in the subgrade and thus dissipates the stresses that build up. When stabilising foundation soils using BEFORCE PH 55 Polypropylene Woven Fabric, the modulus of deformation, EV2, of the subgrade must first be determined in order to establish its load-bearing capacity.

As a general rule, a modulus of deformation, EV2, of 45 MN/m2 is required for the subgrade and 120 MN/m2 for the frost protection layer. In order to reduce deformation and increase the load-bearing capacity to the required level, the woven geotextile must be laid on the raw subgrade. Traffic loading generates tensile stresses in the plane of the geosynthetic layer and these are absorbed by the BEFORCE PH 55 Polypropylene Woven Fabric.

In accordance with the "Merkblatt über die Anwendung von Geokunststoffen im Erdbau des Straßenbaues" (Leaflet on the use of geosynthetics in earthworks for highway construction), woven geotextiles are used in applications where a reinforcing and/or separating effect is required.

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Improvement in load-bearing capacity due to BEFORCE PH 55 Woven Fabric
Demonstrated using the example of a modulus of deformation of EU = 10MN/m2

Professional assessment on site
The correct static analysis and assessment of the geotextile-reinforced structure are the responsibility of the on-site specialist and include the appraisal and interpretation of all matters relating to the proposed structure and the subgrade.

Trial area
Because the foundation soil often varies greatly across the site, a trial area for the proposed reinforced structure should be chosen at the most unfavourable location. The load-bearing capacity of the soil improvement layer and the frost protection layer is determined by carrying out plate load tests. Testing of the load-bearing capacity of the reinforced base course should not be carried out until at least two days after the material has been compacted. This allows the excess pore water pressure in the upper part of the subgrade to dissipate.

Project-specific requirements
The BONTEC PH 55 range of polypropylene woven fabrics offers a wide spectrum of special reinforcing products. Since it meets the requirements of geotextile robustness class 5, the standard BEFORCE PH 55 fabric is suitable for most applications.

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If the requirements in specific cases are even higher, we would be happy to determine which type of product is suitable.

Areas of applications of the BEFORCE PH 55 Polypropylen

Applications

Woven tape fabric is the preferred geotextile for surface stabilisation and for increasing load-bearing capacities in highway, traffic route and rail construction.

Particularly where substrate stabilisation for paved or unpaved traffic routes is concerned, BEFORCE PH 55 woven geotextiles provide a simpler and more cost-effective solution than conventional methods such as soil replacement or soil stabilisation using lime. Other applications include service roads, car parks, cycle paths and construction site access roads.

Reinforcing layer under a dam
Several reinforcing layers
Dam constructed on a widened, reinforced foundation bed for increased protection against slip and shear failure
Reinforced layer as soil replacement
Reinforcing layer under roads with unbound surfaces (construction site access roads and service roads)
Separating and reinforcing a layer of replaced soil to improve the load-bearing capacity of the formation layer and to support vehicular traffic during the construction phase
Improved base layer without soil replacement

If a reinforced base course is constructed, there is no need for a stability analysis for the subgrade provided that the requirement of EV2 > 120 MN/m2, where EV2/EV1 < 2.3, is met at the upper surface of the frost protection layer.

Typical values
Improved base layer with soil replacement

If it is expected that the existing subgrade will not have the required load-bearing capacity of EV2 > 45 MN/m2, the subgrade or base layer must be improved. One method of improvement is by replacing the existing soil and this can be minimised by using BEFORCE PH 55 Woven Geotextile.

Typical values
Reinforced foundation bed as a bearing layer for pipeline

Advantages of the BEFORCE PH 55 Polypropylen Woven Fabrics

 The advantages of BEFORCE Polypropylen Woven Fabric:

  • Separation of sub-base material from substrate
  • Reinforcing effect in the foundation course
  • Good filtering properties
  • Reduction in thickness of sub-base layers for traffic routes
  • Reduced rut formation in unpaved roads
  • Simple to lay
  • Low labour input
  • Low transport costs
  • High design reliability
  • Potential cost savings compared to conventional methods


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Installation instructions for the BEFORCE PH 55 Polypropylen

Installation instructions for BEFORCE Polypropylen Woven Fabrics:

  1. The subsoil should be as flat and even as possible in order to ensure full contact with the woven fabric across the entire surface.
  2. The woven geotextile must be laid flat and free of creases.
  3. When filling and compacting material on top of the fabric, care must be taken to prevent displacement or creasing of the fabric.
  4. Our detailed installation and laying instructions for BEFORCE Polypropylene Woven Fabrics must also be followed.

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We are here to help.

Geosynthetics
Picture Mr Stefan Bermüller
Mr Stefan Bermüller

Sales Director Geosynthetics

Telephone: +49 (0) 911 64200-49stefan.bermueller@beco-bermueller.de
Picture Ms Julia Miederer
Ms Julia Miederer

Sales Geosynthetics

Telephone: +49 (0) 911 64200-31julia.miederer@beco-bermueller.de

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