Evaluation of the chemical stabilized subgrade soil (CISL Experiment No. 12)

759123180Final report; Summer 2002-June 2003.PDFTech ReportFHWA-KS-07-8C1355PavingAsphalt pavementsAccelerated testsPavement designPavement performancePavement jointsLoad transferConcrete pavementsPortland cement concreteStrain (Mechanics)Pavement crackingKansasKansas. Dept. of TransportationRomanoschi, StefanLewis, PaulDumitru, OctavianBanda, SathishKansas State University. Dept of Civil EngineeringKansas. Dept. of Transportation. Bureau of Materials & ResearchNTL-HIGHWAY/ROAD TRANSPORTATION-DesignNTL-HIGHWAY/ROAD TRANSPORTATION-Construction and MaintenanceNTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and PerformanceNTL-HIGHWAY/ROAD TRANSPORTATION-MaterialsUS Transportation CollectionThe Midwest States Accelerated Pavement Testing Pooled Fund Program, financed by the highway departmentsof Missouri, Iowa, Kansas and Nebraska, has supported an accelerated pavement testing (APT) project to comparethe performance of stabilized clayey embankment soil when Portland cement, fly ash, lime and a commercialproduct were used as stabilizing agents. The project aimed to improve the practices related to the design of flexiblepavements when the top of the subgrade is improved by chemical stabilization. The experiments were conductedat the Civil Infrastructure Systems Laboratory (CISL) of Kansas State University. The test program consisted ofconstructing four flexible pavement structures and subjecting them to full-scale accelerated loading test.The study indicated that cement and lime are the most effective stabilizers for the studied soil. These stabilizersresulted in lower vertical compressive stresses at the top of the subgrade and lower rut depth at the pavement surfacethan the fly ash-treated soil. After more than two million axle load repetitions, the pavement with cement stabilizedembankment soil exhibited much less surface cracking than the pavement with fly-ash stabilized embankment.The commercial product proved not to be effective in stabilizing the non-sulfate clayey soil used in this experiment,when the embankment is constructed at the same moisture content and compaction level as for the other threechemicals. The unconfined compression strength measured on laboratory prepared samples of soil stabilized withthe commercial chemical compound was very similar to that of the untreated soil