Attachment C Federal Highways Riprap Specifications.pdf

Section 705

Section 705. — ROCK

705.01 Gabion and Revet Mattress Rock. Furnish angular stone from a rock quarry or cut that is hard, durable, free of organic and spoil material, and resistant to weathering and water action. Do not use crushed river rock or rock with rounded surfaces. Conform to the following:

(a) Durability index (course), AASHTO T 210 50 min.

(b) Density of a filled basket 100 lb/ft3 (1600 kg/m3) min.

(c) Gradation. Furnish rock with breadth and thickness at least one-third its length.

(1) Baskets 1 foot (300 millimeters) or greater in the vertical dimension.

(a) Maximum dimension 8 in (200 mm)

(b) Minimum dimension 4 in (100 mm)

(2) Baskets less than 1 foot (300 millimeters) in the vertical dimension.

(a) Maximum dimension 6 in (150 mm)

(b) Minimum dimension 3 in (75 mm)

(d) Los Angeles abrasion, AASHTO T 96 50 percent max.

705.02 Riprap. Furnish hard, durable, angular rock that is resistant to weathering and water action and free of organic or other unsuitable material. Angular rock is characterized by sharp, clean edges at the intersections of relatively flat surfaces. Do not use shale, rock with shale seams, or other fissile or fissured rock that may break into smaller pieces in the process of handling and placing. Conform to the following:

(a) Apparent specific gravity, AASHTO T 85 2.40 min.

(b) Absorption, AASHTO T 85 4.0 percent max.

(c) Soundness of aggregate using sodium sulfate, 12 percent loss max.

AASHTO T 104 (5 cycles)

(d) Los Angeles abrasion, AASHTO T 96 50 percent max.

(e) Rock particle intermediate dimension (width) and longest dimension minimum dimension (thickness) (length) min.

(f) Gradation, FLH T 521 Table 705-1

ATTACHMENT C: FEDERAL HIGHWAYS RIPRAP SPECIFICATIONS

Section 705

Table 705-1 Gradation Requirements for Riprap(1)

Class % of Rock

Equal or Smaller by Count, DX

Range of Intermediate Dimensions,(2) inches (millimeters)

Range of Rock Mass,(3) pounds (kilograms)

100 9 – 15 (230 – 380) 59 – 270 (27 – 120) 85 7 – 11 (180 – 280) 28 – 110 (13 – 50) 50 5 – 8 (130 – 200) 10 – 42 (5 – 19) 15 3 – 6 (80 – 150) 2 – 18 (1 – 8)

100 15 – 21 (380 – 530) 270 – 750 (120 – 340) 85 11 – 15 (280 – 380) 110 – 270 (50 – 120) 50 8 – 11 (200 – 280) 42 – 110 (19 – 50) 15 6 – 8 (130 – 200) 10 – 42 (6 – 19)

100 21 – 27 (530 – 690) 750 – 1600 (340 – 730) 85 15 – 19 (380 – 480) 270 – 560 (120 – 250) 50 11 – 14 (280 – 360) 110 – 220 (50 – 100) 15 8 – 10 (200 – 250) 42 – 81 (19 – 37)

100 27 – 33 (690 – 840) 1600 – 2900 (730 – 1300) 85 19 – 23 (480 – 580) 560 – 990 (250 – 450) 50 14 – 17 (360 – 430) 220 – 400 (100 – 180) 15 9 – 12 (230 – 300) 59 – 140 (27 – 64)

100 33 – 39 (840 – 990) 2900 – 4850 (1300 – 2200) 85 23 – 28 (580 – 710) 990 – 1800 (450 – 820) 50 17 – 20 (430 – 510) 400 – 650 (180 – 290) 15 11 – 15 (280 – 380) 110 – 270 (50 – 120)

100 39 – 45 (990 – 1140) 4850 – 7400 (2200 – 3350) 85 28 – 32 (710 – 810) 1800 – 2650 (820 – 1200) 50 20 – 23 (510 – 580) 650 – 990 (290 – 450) 15 13 – 17 (330 – 430) 180 – 400 (82 – 180)

100 45 – 54 (1140 – 1370) 7400 – 12,800 (3350 – 5800) 85 32 – 38 (810 – 970) 2650 – 4450 (1200 – 2000) 50 23 – 28 (580 – 710) 990 – 1800 (450 – 820) 15 15 – 20 (380 – 510) 270 – 650 (120 – 290)

100 54 – 66 (1370 – 1680) 12,800 – 23,400 (5800 – 10,600) 85 38 – 47 (970 – 1190) 4450 – 8450 (2000 – 3850) 50 28 – 35 (710 – 890) 1800 – 3500 (820 – 1600) 15 19 – 25 (480 – 640) 560 – 250 (250 – 570)

100 66 – 78 (1680 – 1980) 23,400 – 38,600 (10,600 – 17,500) 85 47 – 55 (1190 – 1400) 8450 – 13,500 (3850 – 6100) 50 35 – 41 (890 – 1040) 3500 – 5600 (1600 – 2550) 15 22 – 30 (560 – 760) 870 – 2200 (390 – 1000)

100 78 – 90 (1980 – 2290) 38,600 – 59,300 (17,500 – 26,900) 85 55 – 64 (1400 – 1630) 13,500 – 21,300 (6100 – 9650) 50 41 – 48 (1040 – 1220) 5600 – 9000 (2550 – 4100) 15 26 – 36 (660 – 910) 1450 – 3800 (660 – 1700)

(1) Gradation includes spalls and rock fragments to provide a stable, dense mass.

(2) The intermediate dimension is the longest straight-line distance across the rock that is perpendicular to the rock’s longest axis on the rock face with the largest projection plane.

(3) Rock mass is based on a specific gravity of 2.65 and 85 percent of the cubic volume as calculated using the intermediate dimension.