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Upgrading marginal aggregates for road construction along the Oregon Coast Public Deposited

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https://ir.library.oregonstate.edu/concern/administrative_report_or_publications/ms35t936k

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  • The task of obtaining good-quality aggregate for construction is a grow­ing problem for most Oregon coastal communities. Current shortages have forced users to import quality aggregate from areas as far as the Willamette Valley. The practice of transporting aggregate over such long distances is both cost­ly and energy-intensive. One feasible solution to this problem is to use abundant local supplies of low-quality, "marginal" aggregates. However, engineers encounter numerous problems when they use marginal aggregates for construction. Characteristics of these aggregates that contribute to problems include low resistance to mechanical and chemical degradation and poor gradation. Although these materi­als are not of sufficient quality for conventional use, special design con­siderations can help obtain satisfactory performance. The term beneficiate is used to describe a process by which marginal aggregates are upgraded or otherwise made suitable for construction purposes. Marginal aggregates available along the Oregon coast and considered good candidates for beneficiation include: marine basalts, sandstones, sand, and dredged materials. This report briefly outlines the problems associated with the use of these aggregates (a more thorough examination can be found in Construction Aggregates Available Along the Oregon Coast, Oregon State University Extension Service Special Report 614, hereafter Available). This report also includes a discussion of some of the more promising methods of beneficiating marginal aggregates and design considerations for their use.
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