Open-graded Aggregate Base (OGAB) Controlling Subsurface Moisture Regime and Structural Stability from MnROAD Instrumentation Data
Open-graded aggregate base courses have been increasingly used in Portland cement concrete (PCC) pavements as one of the effective strategies for improving subsurface drainage efficiency and thus pavement longevity. In addition to maintaining adequate permeability, these layers are also required to remain stable during pavement construction, performance period and future rehabilitation activities. In an effort to study subsurface drainage and stability of a new open-graded aggregate base material (OGAB Special) under construction, PCC pavement test sections (Cells 306 and 406) were constructed by the Minnesota Department of Transportation (MnDOT) on the 3.5-mile mainline interstate roadway segment at the MnROAD test facility in 2011. Both test cells consist of 6-in. thick PCC slab, 6-in. thick OGAB Special layer and 7-in. Class 5 (MnDOT traditional dense-graded) unbound aggregate underlain by clay subgrade. This paper presents the findings from analyzing field instrumentation data and Falling Weight Deflectometer (FWD) test results to assess the effectiveness of the OGAB Special layer in controlling subsurface moisture regime and providing structural stability. For comparison, field test data were also collected and analyzed from MnROAD Cells 38, 53, and 54 that are located in the low-volume roadway segment and consist of PCC slabs of similar thickness and traditional dense-graded base layers (Class 5 or 6) underlain by clay subgrade. It was concluded from analysis results that the OGAB Special layer cannot only reduce the subsurface moisture content significantly but also provide comparable structural stability, as compared to traditional dense-graded (Class 5/6) base layers.
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Supplemental Notes:
- © 2014 American Society of Civil Engineers.
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Corporate Authors:
American Society of Civil Engineers
1801 Alexander Bell Drive
Reston, VA United States 20191-4400 -
Authors:
- Xiao, Yuanjie
- Tutumluer, Erol
- Wilde, W James
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Conference:
- Second Transportation & Development Congress 2014
- Location: Orlando Florida, United States
- Date: 2014-6-8 to 2014-6-11
- Publication Date: 2014-5
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; References; Tables;
- Pagination: pp 1-13
- Monograph Title: T&DI Congress 2014: Planes, Trains, and Automobiles
Subject/Index Terms
- TRT Terms: Base course (Pavements); Falling weight deflectometers; Open graded aggregates; Permeability; Portland cement concrete; Stability (Mechanics); Subsurface drainage
- Geographic Terms: Minnesota
- Subject Areas: Highways; Maintenance and Preservation; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I36: Aggregates;
Filing Info
- Accession Number: 01531794
- Record Type: Publication
- ISBN: 9780784413586
- Files: TRIS, ASCE
- Created Date: Jul 29 2014 8:53AM