Geoplastics and Geotextiles
Streets and traffic surfaces, railway construction, earth-moving and foundation work, drainage systems, erosion control, retention ponds and dams/dikes – geo-plastics and geo-textiles with their high quality requirements are found everywhere. Zwick has the perfect solutions for the resulting test-setups: widest range of designs of test machines, suitable specimen grips and the corresponding jaw inserts, and the proven testXpert® test software for every application.
In tensile testing on geo-non-wovens with the optical extensometer system using hydraulic specimen grips according to EN ISO 10319, the main characteristic for determining tensile strength of fabrics is the specimen width. For the basic test of this method, the specimen width (200mm) is greater than its length (100mm), as some geotextiles have the tendency to constrict ("neck down") transverse to the direction of the force during tensile loading. Wide-width strips reduce the constriction effect, thus providing a closer relation to the expected product properties. | |
Static Puncture Test (CBR Test)
EN ISO 12236 specifies a method for the determination of the puncture resistance by measuring the force required to push a flat-ended plunger through geo-synthetics. The test is normally carried out on dry specimens conditioned in the specified atmosphere. The test is applicable to most type of products but not to materials with apertures greater than 10mm. In this case, the crosshead travel monitor reliably determines the displacement. The specimen clamping is done between two steel rings. | |
