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Accession Number PB2014-106432
Title Design and Evaluation of Foamed Asphalt Base Materials.
Publication Date May 2013
Media Count 95p
Personal Author C. W. Schwartz S. Khosravifar
Abstract Foamed asphalt stabilized base (FASB) combines reclaimed asphalt pavement (RAP), recycled concrete (RC), and/or graded aggregate base (GAB) with a foamed asphalt binder to produce a partially stabilized base material. The objectives of this study are to determine for Maryland conditions: (a) FASB mix design procedures; (b) typical engineering and structural design properties; (c) guidelines for FASB production and placement; and (d) best practices for construction quality assurance. The study consisted of three major components: (a) laboratory evaluation of FASB mix design procedures; (b) field evaluation of in-place FASB stiffness, and especially the increase in this stiffness with time due to curing; and (c) direct laboratory measurement of the performance related properties of FASB, specifically dynamic modulus and permanent deformation resistance. Recommended default design values for resilient modulus and structural layer coefficient are 300 400 ksi and 0.30 0.35, respectively. The study findings also provided guidance for the development of draft specifications.
Keywords Additives
Base courses
Bitumens
Calcium oxides
Cycles
Durability
Foamed asphalt
Freezing
Melting
Mixtures
Pavement bases
Soaking
Stability
Stabilization
Waste recycling


 
Source Agency Maryland Department of Transportation Division of Finance
NTIS Subject Category 91B - Transportation & Traffic Planning
85 - Transportation
43G - Transportation
50A - Highway Engineering
50B - Civil Engineering
71A - Ablative Materials & Ablation
71M - Miscellaneous Materials
Corporate Author Maryland Univ., College Park.
Document Type Technical report
Title Note Final rept.
NTIS Issue Number 1418
Contract Number SP909B4E

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