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Title: Long-Term Performance of Chemically Modified Subgrade Soils in Indiana
Accession Number: 01090768
Record Type: Component
Record URL: Availability: Transportation Research Board Business Office 500 Fifth Street, NW Find a library where document is available Abstract: Chemical modification of soils with lime in Indiana is widely used to improve the workability and compactability of weak subgrade soils. Although the modification process is primarily aimed at construction expediency, additional effects such as long-term improvement of stiffness or strength by pozzolanic and carbonation cementation processes of the treated soils have been expected but have not been quantified. Because of a lack of confidence in the long-term performance of the chemically modified soils, their enhanced stiffness has not been taken into account in pavement design, leading to a conservative design of the asphalt or concrete pavement layers. Six roads that have been in service for 5 to 11 years were selected to conduct field tests. The selection was performed considering (a) location of road project in Indiana, (b) class of road, (c) year when chemical treatment was done, (d) type of chemical modifier used, (e) type of pavement, (f) availability of geotechnical information for postconstruction evaluation, and (g) traffic and safety control for field testing. The results from the field tests show that the long-term stiffness or strength of subgrades that were chemically treated 5 to 11 years ago is 4 to 11 times higher than that of natural subgrades. This finding suggests that the enhanced stiffness of the chemically modified subgrade could be accounted for in pavement design, which would lead to a reduction of the thickness of asphalt or concrete pavement layers.
Monograph Title: Monograph Accession #: 01114749
Language: English
Authors: Jung, ChulminBobet, AntonioSiddiki, Nayyar ZiaKim, DaehyeonPagination: pp 63-71
Publication Date: 2008
ISBN: 9780309113298
Media Type: Print
Features: Figures
(4)
; Maps
(1)
; Photos
(6)
; References
(9)
; Tables
(5)
TRT Terms: Geographic Terms: Subject Areas: Geotechnology; Highways; Pavements; I42: Soil Mechanics
Files: PRP, TRIS, TRB, ATRI
Created Date: Jan 29 2008 3:05PM
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