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NONWOVEN GEOTEXTILE WITH FUNCTION OF PROTECTION USED IN THE CONSTRUCTION OF TUNNELS



Non woven geotextile type GEO PP AG 400, obtained by high tenacity polypropylene fibres UV stabilized, mechanically bonded.

The conformity of  geotextile to the application foreseen by the harmonized standard EN 13256 shall be certified by a declaration concerning surveillance on production control of goods, released by a notified Body, in accordance to the directive 89/106/EEC ( building products ) .

The supplier of geotextile shall be certified EN ISO 9001: 2000.
The maximum term concerning exposition to UV radiation shall be  1 month, as per indications given by the harmonized standards above mentioned ( residual resistance after accelerated exposition test  EN 12224 :  >80 % ).
 The minimum durability of geotextile shall be of  25 years at least ( residual resistance after oxidation test for polypropylene products EN ISO 13438 :  >50% ).
Junctions between the sheets, both in transversal and longitudinal direction, shall be done by overlapping of  borders for at least 50 cm.

Technical characteristics of geotextile shall be in accordance to the values and tolerances written in the scheme here below:


Technical properties

unit

Standard

 

static puncture resistance  (method CBR)

N

EN ISO 12236

5300

maximum tolerance allowed

-500

       

dynamic puncture resistance  (cone drop test)

mm

EN ISO 13433

7

maximum tolerance allowed

+ 1,4

       

tensile strength  - longitudinal

kN/m

EN ISO 10319

29

maximum tolerance allowed

-3,0

       

tensile strength - transversal

kN/m

EN ISO 10319

29

maximum tolerance allowed

-3,0

       

elongation at break -  longitudinal

%

EN ISO 10319

60

maximum tolerance allowed

20

       

elongation at break - transversal

%

EN ISO 10319

60

maximum tolerance allowed

20

       

water flow capacity in the plane (20 kPa, i=1 )

m2/s x 10-6

EN ISO 12958

4,8

maximum tolerance allowed

-1,5

       

protection efficiency (under 300 kPa)

%

EN 13719

2,8

tolleranza massima ammissibile

+ 0,2