Biofuel co-product uses for pavement geo-materials stabilization : final report, April 2010.
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2010-04-01
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Edition:Final report
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance;NTL-HIGHWAY/ROAD TRANSPORTATION-Soils and Geology;
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Abstract:The production and use of biofuels has increased in the present context of sustainable development. Biofuel production from plant
biomass produces not only biofuel or ethanol but also co-products containing lignin, modified lignin, and lignin derivatives. This
research investigated the utilization of lignin-containing biofuel co-products (BCPs) in pavement soil stabilization as a new application
area. Laboratory tests were conducted to evaluate the performance and the moisture susceptibility of two types of BCP-treated soil
samples compared to the performance of untreated and traditional stabilizer-treated (fly ash) soil samples. The two types of BCPs
investigated were (1) a liquid type with higher lignin content (co-product A) and (b) a powder type with lower lignin content (coproduct
B). Various additive combinations (co-product A and fly ash, co-products A and B, etc.) were also evaluated as alternatives to
stand-alone co-products. Test results indicate that BCPs are effective in stabilizing the Iowa Class 10 soil classified as CL or A-6(8) and
have excellent resistance to moisture degradation. Strengths and moisture resistance in comparison to traditional additives (fly ash)
could be obtained through the use of combined additives (co-product A + fly ash; co-product A + co-product B).
Utilizing BCPs as a soil stabilizer appears to be one of the many viable answers to the profitability of the bio-based products and the
bioenergy business. Future research is needed to evaluate the freeze-thaw durability and for resilient modulus characterization of BCPmodified
layers for a variety of pavement subgrade and base soil types. In addition, the long-term performance of these BCPs should be
evaluated under actual field conditions and traffic loadings. Innovative uses of BCP in pavement-related applications could not only
provide additional revenue streams to improve the economics of biorefineries, but could also serve to establish green road
infrastructures.
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