Static puncture test

The second test, BSENISO 12236 Static Puncture Test (California Bearing Ratio (CBR) Test) is referred to a large-size puncture test and appropriate to the situation of aggregate consolidation. It is also commonly referred to as the CBR test, because it is based on the ASTM D1883 CBR test performed by measuring the pressure required to penetrate a soil sample with a plunger. 

The static puncture test is described in EN ISO 12236 Geotextiles and Geotextiles-Related Products - Static Puncture Test. A cylindrical stamp (50 mm in diameter) is pressed through a clamped geomembraue disk of 150 mm fiee diameter at a speed of 50 mm/min. Thereby the resistauce to quasi-static puncture by a small, sharp edged object is determined. The maximum force required (puncture resistance) is the test parameter. The 2.5 mm thick HDPE geomembianes typically reach values > 6000 N. 

Static puncture test DIN ENISO 12236, crosshead speed 50 mm/min... 

EN ISO 12236 1996 Geotextiles and Geotextile-related products - Static Puncture Test (CBR-Test)... 

In the past, the puncture index test was also used for GTX. This test is similar to the static puncture test (CBR) but a different plunger (0 8 mm) is used and the specimen is smaller. CBR tests have replaced the puncture index test because the CBR test gives more consistent results than the small puncture index test. 

Table 7.8 Test Conditions for static puncture test...

Figure 7.15 Static puncture test on a nonwoven geotextile. Courtesy LGA.

---