919 GEOTEXTILES

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919 GEOTEXTILES
919.01 Geotextile Requirements. Geotextiles used on Administration projects shall participate in the National Transportation Product Evaluation Program (NTPEP) and conform to the Contract Documents and MSMT 732. Geotextiles shall be manufactured from fibers consisting of long chain synthetic polymers, composed of a minimum 95 percent by weight of polyolefins or polyesters, and formed into a stable network so the filaments or yarns retain their dimensional stability relative to each other, including selvages. Geotextiles used on Administration projects shall conform to the following:
Note 1: All property values in the above table are based on minimum average roll values in the weakest principal direction except for apparent opening size.
Note 2: The ultraviolet stability shall be 50 percent after 500 hrs of exposure for all classes, except Class F, which shall be 70 percent (D4355).
*15 percent elongation for silt fence and monofilament woven geotextile in Machine Direction.
**This is a MINIMUM apparent opening size, not a maximum.
***Machine Direction
MARYLAND

APPLICATION CLASS

TYPE OF GEOTEXTILE GRAB STRENGTH

lb

PUNCTURE STRENGTH

lb

PERMITTIVITY

sec-1

APPARENT OPENING SIZE, MAX

mm

TRAPEZOID TEAR STRENGTH***

lb

D4632 D6241 D4491 D4751 D4533
SD TYPE

I

NONWOVEN 160 310 0.50 0.43 55
WOVEN, MONOFILAMENT 250 495 0.50 0.43 90
TYPE

II

NONWOVEN 160 310 0.20 0.25 55
WOVEN, MONOFILAMENT 250 495 0.20 0.25 90
PE TYPE

I

NONWOVEN 200 430 0.70 0.43 80
WOVEN, MONOFILAMENT 250 620 0.70 0.43 90
TYPE

II

NONWOVEN 200 310 0.20 0.25 55
WOVEN, MONOFILAMENT 250 495 0.20 0.25 90
TYPE

III

NONWOVEN 200 220 0.10 0.22 40
WOVEN, MONOFILAMENT 250 370 0.10 0.22 70
SE NONWOVEN 160 310 0.20 0.30 80
WOVEN 250 495 0.20 0.30 90
ST WOVEN 300* 600 0.05 0.15** 110
F WOVEN 200 450 0.05 0.60 75
E NONWOVEN 200 450 1.1 0.21 80
WOVEN, MONOFILAMENT 370 900 0.28 0.21 100
Contact the Office of Materials Technology’s Soils and Aggregate Technology Division for approval of geotextiles used for reinforcement applications.
919.02 Seam and Overlap
D4884. Geotextiles joined by sewing shall conform to the following:
(a) Either “J” or “Butterfly” type seams joined with a lock stitch.
(b) Tensile strength requirements when tested across the seam.
(c) Thread used for seaming shall be of equal or greater durability than the geotextile itself.
919.03 Securing Pins or Staples
Minimum 10 in. length and designed to securely hold the geotextile in place during construction.