STP774

    Beneficiation of Marginal Coastal Oregon Aggregates with Cement

    Published: Jan 1982


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    Abstract

    Coastal Oregon has a severe shortage of quality construction aggregates. There is, however, an abundant supply of lower quality, or marginal, aggregates. In an attempt to use marginal aggregates, the feasibility of beneficiation with cement has been investigated. Specifically, the optimum cement contents to stabilize three marginal aggregates (Tyee sandstone, marine basalt, dredge spoil sand) were determined. The resilient modulus and fatigue life characteristics were measured for the aggregates stabilized at the optimum cement contents. The influence of moist curing time and wetting and drying or freezing and thawing cycling on the properties measured were evaluated. The results indicated the resilient moduli of all the materials tested increased with moist curing time. The resilient moduli of the stabilized aggregates were not affected by freezing and thawing cycling, however, the moduli were reduced after wetting and drying cycling. The fatigue life characteristics, expressed in terms of tensile stress versus number of load repetitions to failure, were not significantly different for the moist cured stabilized materials compared to the stabilized materials subjected to wetting and drying or freezing and thawing cycling. The resilient moduli and fatigue life properties measured were used to arrive at typical layer thicknesses and layer equivalencies for road sections employing the cement stabilized marginal aggregates. The results indicate beneficiation of marginal aggregates with cement is economically justifiable.

    Keywords:

    aggregates, cement stabilization, durability, fatigue life, layer equivalencies, concrete, cement, fatigue (materials)


    Author Information:

    Chang, C
    Graduate research assistant, professor, and associate professor, Oregon State University, Corvallis, Ore.

    Hicks, RG
    Graduate research assistant, professor, and associate professor, Oregon State University, Corvallis, Ore.

    Vinson, TS
    Graduate research assistant, professor, and associate professor, Oregon State University, Corvallis, Ore.


    Paper ID: STP32458S

    Committee/Subcommittee: D04.95

    DOI: 10.1520/STP32458S


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