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18TH STREET PEDESTRIAN IMPROVEMENTS 3741 RMT July 03, 2024 73 8-26.2(7) Bond Breaker Geotextile 1 2 Bond breaker geotextile: A material placed between the top course of the cement 3 concrete modular block unit retaining wall and the sidewalk concrete to prevent or 4 limit bond between the concrete pavement and the base material. 5 6 Bond Breaker Geotextile filter fabric shall conform to the following table: 7 8 Property Requirements Test method Geotextile type Nonwoven, needle-punched geotextile, no thermal treatment (calendaring or IR) EN 13249, Annex F (Manufacturer certification of production) Mass per unit area ≥ 450 g/m² (13.3 oz/yd2) ≤ 550 g/m² (16.2 oz/yd2) ISO 9864 (ASTM D 5261) Thickness under load (pressure) a. At 2 kPa (0.29 psi): ≥ 3.0 mm (0.12 in) b. At 20 kPa (2.9 psi): ≥ 2.5 mm (0.10 in) c. At 200 kPa (29 psi): ≥1.0 mm (0.04 in) ISO 9863-1 (ASTM D 5199) Wide-width tensile strength ≥ 10 kN/m (685 lb/ft) ISO 10319 (ASTM D 4595) Wide-width maximum Elongation ≤ 130% ISO 10319 (ASTM D 4595) Water permeability in normal direction under load (pressure) At 20 kPa (2.9 psi): ≥ 1×10-4 m/s (3.3×10-4 ft/s) DIN 60500-4 (mod. ASTM D 5493 or ASTM D 4491) In-plane water permeability (transmissivity) under load (pressure) a. At 20 kPa (2.9 psi): ≥ 5×10-4 m/s (1.6×10-3 ft/s) b. At 200 kPa (29 psi): ≥ 2×10-4 m/s (6.6×10-4 ft/s) ISO 12958 (mod. ASTM D 6574 or ASTM D 4716) Weather resistance Retained strength ≥ 60% EN 12224 (ASTM D 4355 @ 500 hrs. exposure) Alkali resistance ≥ 96% polypropylene/polyethylene EN 13249, Annex B (Manufacturer certification of polymer) 9 8-26.3 Construction Requirements 10 Contractor shall excavate to the lines and grades shown on the construction drawings. 11 The Engineer shall inspect the excavation and approve the foundation soils prior to 12 placement of leveling material or fill soils. 13 14