Properties of Ultra-Highly Pulverized Granulated Blast Furnace Slag-Portland Cement Blends


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Title: Properties of Ultra-Highly Pulverized Granulated Blast Furnace Slag-Portland Cement Blends

Author(s): S. Numata, Y. Koide, and S. Shimobayashi

Publication: Special Publication

Volume: 91


Appears on pages(s): 1341-1360

Keywords: abrasion resistance; acid resistance; blast furnace slag; blended cements; drying shrinkage; freeze-thaw durability; high-strength concretes; plasticizers; porosity; sulfate resistance; water-reducing agents; workability.

Date: 2/1/1986

This paper describes a study of the full exploitation of the inherent hydraulic behavior of granulated blast-furnace slag. An attempt was made by laboratory tests and by actual concrete practices to improve the properties of conventional slag cements and develop a high quality binder. Granulated blast-furnace slag pulverized and classified by an industrial mill (Blaine fineness 850 m2/kg> was mixed with ordinary portland cement and semi-crushed granulated blast-furnace slag sand aggregate with the addition of a high-range water-reducing admixture. Workability, strength, and resistance to freezing and thawing cycles, mechanical abrasion and chemical attacks were determined. Microstructures were measured by SEM, and mercury intrusion and nitrogen adsorption porosimetries. Major findings of the research include: 1 . Workable mixtures with ultra-highly pulverized blast-furnace slag can be obtained with the addition of high-range water-reducing admixtures (HRWRA) and have less bleeding. 2. Use of ultra-highly pulverized blast-furnace slag is effective in getting a very dense and uniform structure of the hydrated paste and shows superior characteristics with high-strength concrete having more than 100 MPa, as compared to the straight portland cement high-strength concrete. 3. Densification and reduced calcium hydroxide caused by the hydration of slag remarkably improve the resistance to acid and sulfate attack as well as other characters.