Degree Type

Thesis

Date of Award

2007

Degree Name

Master of Science

Department

Civil, Construction, and Environmental Engineering

First Advisor

Christopher R. Williams

Second Advisor

Vernon R. Schaefer

Third Advisor

Robert W. Stephenson

Abstract

Oxidation is the primary cause of aging in asphalt pavements. The use of an antioxidant as a performance enhancer in an asphalt could delay aging, thus increasing the life of an asphalt pavement. Lignin is a highly-available, well-studied antioxidant. The use of lignin from ethanol production could provide benefit to asphalt pavements while also giving more value to the co-products. Lignin-containing co-products were each combined with four asphalt binders separately in varying amounts to determine the optimum amount of co-product that would provide the greatest benefit to the asphalt binders. The data indicates a stiffening effect of the binder. The more co-product added, the greater the stiffening. Binder stiffening benefits the high temperature properties, while the low temperature binder properties are negatively affected. However, the low temperature effects are small, and in many cases not significant. The co-products have an overall effect of widening the temperature range of the binders.

DOI

https://doi.org/10.31274/rtd-180813-15851

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu/

Copyright Owner

Nicolaus Straub McCready

Language

en

Proquest ID

AAI1447520

OCLC Number

224490338

ISBN

9780549334767

File Format

application/pdf

File Size

109 pages

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