FIBERTEX AM2 PAVING FABRIC

Transcription

1 FIBERTEX AM2 PAVING FABRIC

2 FIBERTEX AM2 FOR STRESS RELIEVING AM2 saturated with bitumen prolongs the surfacing lifetime by waterproofing the road seal. This prevents the ingress of water into the base layers thereby reducing rutting and potholes caused by a weakened substructure. Retards the possibility of reflective cracking and bridges small underlying cracks thereby reducing the resurfacing thickness. Accommodates a larger degree of surface deflection reducing overall maintenance costs.

3 Designing asphalt overlays with Fibertex AM2 Paving fabrics are widely used in both new road construction and in road maintenance mainte to reduce reflective cracking in the pavement. The purpose is to distribute stresses originating from cracks in the lower part of the pavement by creating a stress relieving and/or waterproofing interlayer membrane system. The waterproofing function prevents surface water from entering the bearing courses, whereas wher the stress relieving function is defined as follows: Paving fabrics,, properly installed between an existing pavement surface and a new overlay, overlay provide a stress relieving function, as the bitumen-saturated bitumen saturated paving geotextile allows for slight differential movements between the layers. Because of the above, Fibertex AM2 increases the lifespan of the asphalt wearing course up to a factor of 3. Causes auses of reflective cracking in asphalt overlays: Fig.1. The paving fabric absorbs differential movement in the asphalt layers preventing preven reflective cracking. Additionally it forms a waterproof interlayer preventing surface water from entering the old asphalt layer. Fig.2. Without paving fabric, reflective cracking of the new asphalt overlay will occur and surface water will enter the old asphalt layer. This will accelerate deterioration of the entire road construction.

4 C O N S T R U C T I O N Product Data Sheet AM-2 SA Polypropylene Needled Punched Geotextiles 4074/ SA Property Test method Unit Value Static puncture (CBR-test) SANS N 1700 Static Puncture Elongation at break SANS % >50 Tensile Strength Machine Direction SANS kn/m 8 Tensile Strength Transverse Direction SANS kn/m 12 Tensile Elongation at break(md/cd) SANS % >45 Grab Strength (minimum) ASTM D-4632 N 450 Trapezoid Tear Strength (minimum) ASTM D-4533 N 250 Dynamic Cone Drop AS mm 26 G Value (Robustness) Geotextile Strength Rating (Refer Note 1) NSW RTA R63. value 1500 Melting Point ASTM D-276 o C 165 Bitumen Retention (Refer Note 2) ASTM D-6140 l/m Weight SANS g/m Thickness SANS mm 1.9 Fibertex Geotextiles Fibertex is manufactured from polypropylene staple fibres which are needle-punched. Fibertex is highly durable and resistant to all natural occurring soil alkalis and acids. Fibertex is manufactured from virgin polypropylene fibres added with HALS UV stabilizer. Roll sizes: Roll length 100 lm x Roll width 5.2 m Fibertex geotextiles are manufactured to quality assurance procedures. Notes 1. The G value (Robustness) Geotextile Strength Rating classifies the robustness through the geometric mean calculated from the Penetration Load (CBR Plunger Test) and the Puncture Resistance (Drop Cone Test). G = L x h 50, L = Load (Newtons) on the CBR plunger test at failure as per test method SANS H 50 = Drop Height (mm) required to make a 50 mm diameter hole as per test method AS The Bitumen Retention value is determined using a Penetration Grade 80/100 Bitumen Above technical values are mean values and are indicative. Fibertex reserves the right to make technical modifications to its products without notice. The information contained in this publication is provided in good faith and to the best of our knowledge is true and accurate. There is no implied or expressed warranty and Fibertex South Africa (Pty) Ltd does not accept any liability for any information supplied as the conditions of use and installation of the material are out of our control Fibertex South Africa (Pty) Ltd PO Box 20 Hammarsdale 3700, South Africa Tel: +27 (0) Fax: +27 (0) Pinetown (Fibertex South Africa): Tel: Fax: Johannesburg (Geotextiles Africa): Tel: Fax: Cape Town (Geotextiles Africa): Tel: Fax:

5 AM2 INSTALLATION PROCEDURE: Basic Equipment Hard bristle brooms. Squeegees. Spades. 25 litre buckets. Stanley knife or similar. Pneumatic tyre roller. Laydown machine (optional). Bitumen spray truck. Tipper truck. Chip spreader (optional). Mechanical rotary broom. Full Width under Seals and Asphalt The existing pavement surface, concrete or asphalt, is cleaned thoroughly to remove all weeds, dirt, oil, water and other impurities. Where necessary large holes and cracks are to be properly patched and leveled. Apply recommended polymer modified bitumen emulsion as per attached data sheet at a temperature of 60 C and a nominal rate of 1.35 l/m². Depending on general surface conditions the application demand can increase from between 0.1 and 0.5 l/m². Allow emulsion to break properly i.e. turn from brown to black. Apply the AM2 by unrolling fabric manually or with mechanical laydown machine, minimising the amount of wrinkles as much as possible by using the squeegees. Large folds or wrinkles must be cut, with extra bitumen being applied to the underside of the overlaps of 150mm min. Allow approximately 3 hours for the tack coat to dry and then roll with pneumatic tyre roller with 4 passes. Make sure the tyres of the roller have been cleaned with a solvent beforehand. Adjacent lanes must be sprayed with an approximate150mm overlap along the longitudinal AM2 edge. Transverse overlaps should be a minimum of 200mm. Apply asphalt overlay as per normal design procedure or apply a saturation coat at 0.6 l/m² and allow to break. Apply an aggregate blinding layer as per COLTO, with 100% passing the 6.7mm sieve and not more than 10% passing the 2.36mm sieve and open to traffic. Proceed with conventional wearing course if applicable. 4

6 Overlaps Longitudinal overlaps should be a min. o f 10 cm and transverse overlaps approx. 20 cm. Manual laying of Fibertex AM2 around corners will be required to be done in sections. 5