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Home / DOT Specifications / Maryland / Standard Specifications for Construction and Materials / 927
Category 900 — Materials

927Open Graded Friction Course Mix

MD · 2026 Standard Specifications✓ Full text on BuildSpecBook pages 1089–1090 Save this section

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— OPEN GRADED FRICTION COURSE MIX CATEGORY 900 MATERIALS Open Graded Friction Course (OGFC) shall conform to the applicable sections of 901 and PP 77, except as specified. GRADATION: *Mix Control Tolerance not applicable to this sieve for this mix.

(a)Less than Design Level 4 (ESAL).
(b)Porous European Mix (PEM) – Design Level 4 (ESAL).
(c)Conduct drain-down test on loose mix at a temperature 15 C higher than

anticipated production temperature. Crushed glass, roofing shingles, RAP, or other recycled materials are not allowed in OGFC mixes. Design Gradation Limits, % Passing Sieve Size Mixture Control Tolerance, % 9.5 mm OGFCa 12.5 mm OGFCa 12.5 mm PEMb 3/4 in. (19 mm) ±0.0 100* 100* 1/2 in. (12.5 mm) ±6.0 100* 85-100 80-100 3/8 in. (9.5 mm) ±5.5 85-100 55-75 35-60 No. 4 (4.75 mm) ±6.0 20-40 15-25 10-25 No. 8 (2.36 mm) ±4.5 5-10 5-10 5-10 No. 200 (75 µm) ±2.0 2-4 2-4 1-4 Range for % AC ±0.4 6.0-7.25 5.75-7.25 5.5-7.0 Drain-down (D6390), %c <0.3 <0.3 <0.3 1075 — OPEN GRADED FRICTION COURSE MIX PHYSICAL PROPERTIES: TEST TEST METHOD LIMITS Asphalt Bindera M 332 64E-22 Tensile Strength Ratio

(TSR)T 283b ≥85%

Permeabilityc MSMT 408 300 ft/day (100m/day)

(a)Mineral Fibers used at 0.4% of total mix, Cellulose, 0.3% of total mix,

or other approved stabilizer systems as specified in 904.05.04.

(b)Tensile Strength Ratio using T 283 with the following exceptions:
(1)Compact using 50 gyrations of a Superpave gyratory

compactor.

(2)Apply partial vacuum of 26 in. (660 mm) Hg for 10 minutes to

whatever saturation level is achieved.

(3)Use five freeze/thaw cycles, keeping the specimens submerged

in water during the freeze cycles.

(c)Permeability is required when material is to be used in Porous Asphalt

Pavement Systems. 1076

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Source: Standard Specifications for Construction and Materials, 2026 Edition. Pages 1089–1090 of 1,138. View official source ↗
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