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Earth and Aggregate Surfacing Design Guide

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Earth and Aggregate Surfacing Design Guide Agricultural Engineering Technical Note No. AEN-4 August 2017 Earth and Aggregate Surfacing Design Guide The U.S. Department of Agriculture (USDA) prohibits discrimination against its customers. If you believe you experienced discrimination when obtaining services from USDA, participating in a USDA program, or participating in a program that received financial assistance from USDA, you may file a complaint with USDA. Information about how to file a discrimination complaint is available from the Office of the Assistant Secretary for Civil Rights. USDA prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex (including gender identity and expression), marital status, familial status, parental status, religion, sexual orientation, political beliefs, genetic information, reprisal, or because all or part of an individual’s income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) To file a complaint of discrimination, complete, sign, and mail a program discrimination complaint form, available at any USDA office location or online at www.ascr.usda.gov/, or write to: USDA Office of the Assistance Secretary for Civil Rights 1400 Independence Avenue, SW. Washington, DC 20250-9410 Or call toll free at (866) 632-9992 (voice) to obtain additional information, the appropriate office or to request documents. Individuals who are deaf, hard of hearing, or have speech disabilities may contact USDA through the Federal Relay service at (800) 877-8339 or (800) 845-6136 (in Spanish). USDA is an equal opportunity provider, employer, and lender. Persons with disabilities who require alternative means for communication of program information (e.g., Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at (202) 720-2600 (voice and TDD). Technical Note No. 210-AEN-04 August 2017 ii Earth and Aggregate Surfacing Design Guide Acknowledgments This technical note was authored by Stephen D Reinsch, P.E., Co- Director of the National Design Construction and Soil Mechanics Center – Soil Mechanics Laboratory (NDCSMC-SML), USDA NRCS, Lincoln, NE; Phillip Rippé , P.E., Head Fort Worth Soil Mechanics Laboratory, USDA NRCS Fort Worth, TX. The technical note was developed under the direction of Noller Herbert, P.E., Director, USDA NRCS Conservation Engineering Division, Washington, DC. Reviewers included Leon Steven Garner, P.E., Civil Engineer, NDCSMC-SML, USDA NRCS, Fort Worth, TX; Steve Becker, P.E., State Conservation Engineer, USDA NRCS, MT; Terri L. Ruch, P.E., State Conservation Engineer. USDA NRCS, NC; Alica Ketchem, P.E., Civil Engineer, USDA NRCS, VA. Technical Note No. 210-AEN-04 August 2017 iii Earth and Aggregate Surfacing Design Guide This page intentionally left blank. Technical Note No. 210-AEN-04 August 2017 iv Earth and Aggregate Surfacing Design Guide Contents Introduction ............................................................................................................................................................1 Literature Review ...................................................................................................................................................2 Aggregate and Similar Surface Materials ...............................................................................................................4 Crushed Gravel and Crushed Stone ....................................................................................................................4 Gravel .................................................................................................................................................................5 Sand ....................................................................................................................................................................5 Aggregate Components ..........................................................................................................................................5 Aggregate Surfaced CP Planning and Field Investigation .......................................................................................8 Subsurface Investigation ....................................................................................................................................9 Design of Unpaved – Aggregate Access Roads .................................................................................................... 15 U.S. Forest Service Low-Volume Access Road Design Procedure ................................................................... 15 Alternative Access Road Design Approach ...................................................................................................... 19 1993 AASHTO Low-Volume Road Design ........................................................................................................ 21 Design of Heavy-Use Area Protection (HUAP)..................................................................................................... 23 HUAP Aggregate Pad Design Procedure .......................................................................................................... 23 HUAP Details .................................................................................................................................................... 25 Design of Trails and Walkways for Animals ......................................................................................................... 27 Natural Materials ............................................................................................................................................. 27 Native Soils ...................................................................................................................................................... 28 Wood Chips ..................................................................................................................................................... 28 Design of Stream Crossings ................................................................................................................................. 29 Perform a Site Reconnaissance and Investigation .......................................................................................... 29 Subgrade Soil Strength .................................................................................................................................... 29 Stream Crossing Design procedure ................................................................................................................. 30 Subgrade Stabilization ......................................................................................................................................... 32 Remove and Replace ....................................................................................................................................... 32 Geosynthetics .................................................................................................................................................. 32 Lime Stabilization ............................................................................................................................................ 33 Cement Stabilization ........................................................................................................................................ 33 Fly Ash .............................................................................................................................................................. 33 Techniques for Additive Selection for Stabilization ........................................................................................ 34 References ........................................................................................................................................................... 37 Appendix A .............................................................................................................................................................. 38 v Technical Note No. 210-AEN-04 August 2017 Earth and Aggregate Surfacing Design Guide Figures Figure 1 – Failure Mode of Aggregate Surfaced Road (U.S. Forest Service, 2008) ....................................................2 Figure 2 – Shear Failure Mechanism With and Without Geotextile...........................................................................3 Figure 3 – Aggregate Layer System Components .......................................................................................................6 Figure 4 – AASHTO Classification System ...................................................................................................................9 Figure 5 – Relationship between Shear Strength CBR and Cone Index (U.S. Army, 1995) ..................................... 10 Figure 6 – Correlation of CBR Values With Soil Index (NCHRP, 2001) ..................................................................... 13 Figure 7 – Typical Bearing Values (psi) Versus Penetration (in.) for Various Materials .......................................... 14 Figure 8 – Single Wheel Load One-Layer System (Stewart et al., 1977) ................................................................. 16 Figure 9 – Dual Wheel Load One-Layer System (Stewart et al., 1977) .................................................................... 17 Figure 10 – Tandem Wheel Load One-Layer System (Stewart et al., 1977) ...........................................................
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