Development of a Preliminary ALRS Stabilized Material Pavement Analysis System (SPAS)

This report is an analytical study of soil stabilization as used in Alternate Launch and Recovery Surface (ALRS) design. The study proposes that ALRS pavements can be designed using a mechanistic design approach and a stabilized pavement analysis system (SPAS) is proposed. Stabilized material properties (strength, modulus, fatigue), structural modeling and behavior concepts, and environmental factors (freeze-thaw, frost depth) are utilized in the SPAS development. Inputs required to establish a stabilized base thickness for an ALRS pavement (F-4 loading) are the field strength of the stabilized material and the E sub Ri (measure of resilient modulus) of the fine-grained subgrade. A properly designed ALRS pavement for F-4 loading can accommodate a limited number of C-130 and F-15 load applications. The SPAS thickness design concepts (based on an intact slab approach) are applicable to a broad range of cementitious-stabilized materials (soil-cement, lime-fly ash-aggregate, soil-lime mixtures, similar high strength and modulus SPAS F-4 thickness requirements appear reasonable. Further research and development activities are required to validate SPAS. Technical report ESL-TR-84-25. Response and Performance of Alternate Launch and Recovery Surfaces Containing Stabilized Material Layers, shall report on predicting structural responses for ALRS pavements using stabilized material. Validation of the research shall use information from Test Report ESL-TR-83-46, Performance Data for F-4 Load Cart Operations on Alternate Launch and Recovery Surfaces.

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