Sustainable Stabilization of Sulfate-Bearing Soils with Expansive Soil-Rubber Technology

Project Details
STATE

CO

SOURCE

RIP

END DATE

03/01/13

RESEARCHERS

University of Western Australia, Colorado State University

SPONSORS

CDOT

KEYWORDS

ESR, expansive soils, Mechanistic-Empirical Pavement Design Guide (MEPDG), scrap tire rubber, soil stiffness, subgrade soil stabilization, sulfate soils

Project description

The beneficial use of scrap tire rubber mixed with expansive soils is of interest to civil engineering applications since the swell percent and the swell pressure can be potentially reduced with no deleterious effect to the shear strength of the mixture. The two main objectives of this research were (1) to propose a new subgrade soil stabilization protocol to allow CDOT to rely upon an alternative stabilization method that is not subject to the typical problems associated with calcium-based stabilization of sulfate-rich soils, and (2) to develop a new database of MEPDG parameters for local soil samples obtained from CDOT and to provide advanced testing and analysis of the stiffness degradation of these materials.
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