Durability of Concrete in Marine Environment Containing Granulated Blast Furnace Slag, Fly Ash, or Both


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Title: Durability of Concrete in Marine Environment Containing Granulated Blast Furnace Slag, Fly Ash, or Both

Author(s): V. M. Malhotra, G. G. Carette, and T. W. Bremner

Publication: Special Publication

Volume: 65


Appears on pages(s): 157-168

Keywords: blast furnace slag; compressive strength; concrete durability; fly ash; freeze-thaw durability; marine atmospheres; portland cements; research; sea water; wetting and drying tests.

Date: 8/1/1980

This progress report describes the CANMET research project for the determination of durability of portland cement/ granulated blast-furnace slag/fly ash concretes in marine environment. The research project has been divided into three phases. Experimental work associated with Phases I and II is :partly complete and the experimental work for Phase III will commence in May-June, 1980. The work entails making mixtures of 0.1 m3 size with water to cementitious materials ratios ranging from 0.40 to 0.60. The cementitious materials used employed various replacements of portland cement with fly ash and granulated blast-furnace slag. The prisms and cylinders have been installed at a natural weathering station at Treat Island, Maine, where they are exposed to the effects of the alternating conditions of immersion of the specimens in sea water, then exposure to cold air and the effects of more than 100 cycles of freezing andthawing per winter. The test specimens at Treat Island are being monitored at yearly intervals for visual deterioration, and measurements are being taken to determine changes in pulse velocity and fundamental resonant frequency. The specimens from Phase I have nou been exposed for one year and the results of first yearly inspection indicate no significant deterioration of any specimens except for some surface scaling on those made with high water-cement ratios and incorporating high percentages of slag.