United States Department of Transportation
i
Implementation : Mitigation of High Sulfate Soils in Texas : Development of Design and Construction Guidelines
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2016-08-01
[PDF-3.01 MB]
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Alternative Title:Development of Design and Construction Guidelines Mitigation of High Sulfate Soils in Texas
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Abstract:Texas Department of Transportation (TxDOT) continues to experience pavement failures which are particularly evident in sites where high sulfate soils of 8000 ppm or higher predominate. Many of the recent pavement failures are attributed to sulfate-induced soil heave where an expansive mineral called Ettringite is formed from calcium-based stabilizers reacting with water, clay, and sulfates in the soil. Current chemical stabilization practices for high sulfate soils have resulted in high maintenance costs and safety concerns due to the increasing roughness and distress that these pavements have experienced. Many districts have to partially or completely rehabilitate these pavements built on high sulfate soils within a few months to three to four years after original construction. In many cases, the repairs will include a complete restoration of the pavement lanes for several miles, which can be translated to losses of entire pavement infrastructure for those miles of pavement. Implementation project 5-6618 is initiated to evaluate the pavement performance at US 82 highway near Bells, TX, where novel construction techniques with two different stabilizers and extended mellowing periods are adopted. Two treated pavement test sections and one control unpaved test section were constructed and monitored periodically during the course of two years and the details of the results are presented. Detailed analysis of Ettringite formation assessments and non-destructive pavement monitoring studies including FWD and profiler are presented. This final report summarizes the results obtained for all the Tasks performed for project 5-6618-001 which include future recommendations for design and construction on high sulfate expansive clayey soils.
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