Geotextile Testing - Root Resistance
7 July 2011, News release from ECSOL Limited
ECSOL Limited now offers the facility to test the Root Resistance of geosynthetic textile materials in accordance with DD CEN/TS 14416 : 2005.
Several geosynthetic textile materials are often used in applications where waterproofing is a primary requirement; these include:
·roof waterproofing systems;
·between-the-slab waterproofing on plaza decks, parking decks, and structural slabs;
·isolation of mechanical and electronic rooms, laboratories, kitchens and bathrooms.
Geosynthetic textiles are also utilised as barriers to prevent root penetration and weed infestation, such as in landfill capping and ground preparation.
Wherever these situations are in direct contact with the environment, establishment and growth of plants is likely, from the uncontrolled perennial weed infestation to shrubs incorporated in a designer- planting programme.
Plant roots will come into direct contact with the barrier system and could penetrate the geosynthetic textile material - resulting in loss of waterproofing capacity and failure to prevent plant establishment. Thus, it is necessary to ensure the barrier system is resistant to root growth, which can be achieved by application of the test method detailed in DD CEN/TS 14416 : 2005.
The DD/CEN Technical Specification describes a laboratory procedure for the testing of the resistance of polymeric, bituminous or clay geosynthetic barriers to root penetration. A section of geosynthetic barrier is placed in soil into which seeds of lupin (Lupinus alba) are sown. The seeds are germinated under ideal, controlled conditions and six to eight weeks later, the geosynthetic barrier is examined to observe whether it has been penetrated by the roots of the young plants.
A recent evaluation of a geosynthetic textile material was carried out in conjunction with CELTEST Limited, who carried out the required physical tests - the results of the root resistance test were indubitable (see images).
Note that the geosynthetic material tested (1 mm thick) was applied to stiff cardboard (biodegradable - 1.5 mm thick) by spray application for the test application; the control utilised the cardboard alone.
For further information please email ECSOL Limited