Curing Characteristics of Wood Particles from Nine Northern Rocky Mountain Species Mixed with Portland Cement

A technique for characterizing the inhibitory effect of wood on the setting of portland cement in a wood-cement-water mixture is presented. An equation was developed from hydration temperature data which quantified nine timber species from northern Idaho as to their inhibitory influence on the setting of portland cement. Results indicated that wood-cement-water systems are highly species sensitive. Lodgepole pine, western white pine, and grand fir had the least effect on cement hydration, while Engelmann spruce, western redcedar, and ponderosa pine were moderately inhibitory. Douglas-fir and hemlock were judged to be highly inhibitory and larch proved to have the greatest effect on cement hydration.

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