Graduate Thesis Or Dissertation
 

An evaluation of coastal Oregon's marginal aggregates

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  • Coastal Oregon is deficient in quality construction aggregates. There is, however, an abundance of lower quality, or marginal, aggregate available for construction purposes. An evaluation of these marginal aggregates is the purpose of this paper. There are four classes of marginal rocks found on the Oregon Coast. Basalts, high in mechanical strength but susceptible to chemical weathering, offer the most likely source of material to the Central and Northern Oregon Coast. Sandstones, which exhibit poor mechanical strength characteristics, are also potential rock sources. Sands and dredged materials, because of poor gradation, require stabilization or blending to provide sufficient stability, but offer a feasible alternative to importation of quality aggregate. Descriptions of tests used to evaluate the mechanical and chemical degradation of the lower quality aggregate found on the coast are in cluded, as well as a summary of the results of such tests. An intensive testing program was undertaken in two phases. Phase I, which consisted of conventional durability testing was used to select appropriate aggregates to be tested in Phase II, or the repeated load test program. Evaluation of the permanent deformation, resilient modulus and degradation due to loading was done on open graded samples and dense graded samples, each in the wet and dry condition. From this testing it was found that the marginal quality aggregates performed as well as the high quality aggregate when dry, but performed rather poorly in the wet state, suggesting waterproofing as a means of upgrading or beneficiating the aggregate. The degradation analysis proved to be of little benefit when comparing the marginal aggregates with the high quality aggregates. The mechanical action of the compaction process and the repetitive loading degraded the aggregates but when they were tested in the wet condition they tended to re-cement upon drying. The results were not indicative of what actually occurred. Blending a high quality basalt with a low quality basalt yielded favorable results with respect to permanent deformation and resilient modulus.
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