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Title: Combining Geogrid Reinforcement and Lime Treatment to Control Dry Land Longitudinal Cracking
Accession Number: 01124166
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: In Texas, dry land longitudinal cracking on the farm-to-market network is one of the most prevalent pavement distresses caused by the volumetric change of expansive subgrade soils. Geogrid reinforcement and lime treatment are found to be the most effective methods to control dry land cracks. To provide a safer and more conservative approach for the pavement structure over expansive subgrade, it is desirable to combine the two methods to be more effective in controlling dry land cracks. This paper describes how to appropriately integrate geogrid and lime so that both methods can contribute to the prevention of longitudinal cracks due to the shrinkage of expansive subgrade. Finite element modeling shows that the best place to install the geogrid should be at the interface of the lime-treated layer and the untreated soil, which is close to the initiation location of shrinkage cracks. At this location, the geogrid can effectively reduce the stress concentration at the upper crack tip. A geogrid with higher stiffness provides more benefit. Lime treatment can improve the tensile strength and fracture toughness of the expansive soil, which further reduces the possibility of cracks propagating through the lime-treated layer. Therefore, the combination of geogrid reinforcement and lime treatment is efficient for the control of dry land longitudinal cracking. The development of multiple shrinkage cracks helps to decrease stress concentration at the crack tips when the geogrid stiffness is at a low level. If the geogrid has an extremely high stiffness, the effect of additional shrinkage cracks is not significant in the numerical simulation.
Monograph Title: Monograph Accession #: 01140575
Report/Paper Numbers: 09-0906
Language: English
Authors: Luo, RongProzzi, Jorge APagination: pp 88-96
Publication Date: 2009
ISBN: 9780309126199
Media Type: Print
Features: Figures
(7)
; Photos
(1)
; References
(14)
; Tables
(3)
TRT Terms: Uncontrolled Terms: Geographic Terms: Subject Areas: Design; Geotechnology; Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I42: Soil Mechanics
Files: TRIS, TRB, ATRI
Created Date: Jan 30 2009 5:09PM
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