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Stability and permeability of proposed aggregate bases in Oklahoma

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Okla State Agency	Transportation, Oklahoma Department of
Okla Agency Code	'345'
Title	Stability and permeability of proposed aggregate bases in Oklahoma
Authors	Khoury, Naji N. (Naji Najib), 1976- Zaman, Musharraf. Ghabchi, Rouzbeh. Kamzee, Hassan. University of Oklahoma. School of Civil Engineering and Environmental Science. Oklahoma. Department of Transportation. Planning & Research Division. Oklahoma Aggregate Association.
Publisher	Oklahoma Department of Transportation
Publication Date	2010-05
Publication type	Research Report/Study
Subject	Pavements--Oklahoma--Subgrades. Aggregates (Building materials)--Permeability. Road drainage--Oklahoma. Roads--Base courses--Testing.
Purpose	The Oklahoma Department of Transportation (ODOT) currently uses three different gradations (ODOT Type A, ODOT Type B and ODOT Type C) for its base layers. A recent laboratory study by Khoury and Zaman revealed that each of these gradations has coefficients of permeability that are more than 1000 times lower than the values recommended by FHWA. Although the benefits of a permeable open-graded base layer are well recognized by ODOT and the industry, successful use of such designs is hindered by the lack of adequate laboratory and field data in Oklahoma. The present study was undertaken to address this gap.; Aggregate base is an important component of a pavement structure. It supports the asphalt concrete (AC) layer and reduces the wheel load-induced stresses on the underlying layers. It also functions as a drainage layer. Consequently, it is important to understand the drainage and strength characteristics of aggregate bases. Permeability (k) and resilient modulus (MR) of aggregate bases are used frequently to identify drainage and strength characteristics of aggregate bases. Historically, gradation specifications used by Oklahoma Department of Transportation (ODOT) have led to aggregate bases with very low permeability. Variations in permeability within the same gradation envelope are observed frequently. Also, ODOT currently lacks laboratory and field data for resilient modulus (MR) and permeability (k) for commonly used aggregates and gradations. To this end, a combined study is undertaken to generate pertinent laboratory and field data on aggregates for different gradations, including new gradations. Specifically, the present study focuses on the effect of gradation and compaction energy on MR and k of aggregates from three commonly used sources in Oklahoma, namely Anchor Stone, Dolese and Martin Marietta.
Notes	Final report - FHWA-OK-09-05; ODOT SPR Item Number 2196; The study was supported jointly by ODOT and the Oklahoma Aggregate Association (OKAA).
OkDocs Class#	T1300.8 S775p 2010
Digital Format	PDF, Adobe Reader required
ODL electronic copy	Downloaded from agency website: http://www.okladot.state.ok.us/hqdiv/p-r-div/spr-rip/library/reports/rad_spr2-i2196-fy2009-rpt-final-zaman.pdf
Rights and Permissions	This Oklahoma state government publication is provided for educational purposes under U.S. copyright law. Other usage requires permission of copyright holders.
Language	English
Date created	2013-03-20
Date modified	2013-03-20

Title	rad_spr2-i2196-fy2009-rpt-final-zaman 1
Full text	i STABILITY AND PERMEABILITY OF PROPOSED AGGREGATE BASES IN OKLAHOMA FINAL REPORT - FHWA-OK-09-05 ODOT SPR ITEM NUMBER 2196 Prepared by: Naji N. Khoury Musharraf Zaman Rouzbeh Ghabchi Hassan Kazmee School of Civil Engineering and Environmental Science The University of Oklahoma Norman, Oklahoma 73019 Submitted to: Ginger McGovern Planning and Research Division Engineer 200 N.E. 21st Street Oklahoma City, OK 73105 May 2010 Page Number
Date created	2013-03-20
Date modified	2013-03-20

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