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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 63 Abstracts search results
Document:
SP79
Date:
May 1, 1983
Author(s):
Editor: V.M. Malhotra
Publication:
Symposium Papers
Volume:
79
Abstract:
SP79 It's a virtual encyclopedia of what mineral by-products do to concrete--and why. 1196 pages of essential information in 62 clearly defined, easy reference chapters. Key subjects include: effects on durability, fiber reinforced concrete, fly ash, pozzolans, sulfate resistance and concrete workability. With the rapidly increasing usage of by-product additives in concrete, every designer and builder needs the answers which these volumes provide.
DOI:
10.14359/14036
SP79-52
Michel Pigeon and Micheline Regourd
The 100% clinker anker and 70% sla freeze-d 0% sl g was s cm'/g Blaine) and one 3920 cm2/g Blaine) was varying air void chara An air entraining agen aggregate gradings were thaw resistance of three cements, 70% clinker and 30% slag, and tudied. Only one clinker (ground granulated blast-furnace slag (gr used. Six mortar mixes (W/C = 0 cteristics were fabricated from e t, a water reducer, and different used to produce a range of air vo C ontaining 30% clin-to 3165 und to 5) with ch cement. fine agd spacing factor (L) values. A total of 54 prisms, three of each mix, with dimensions of 70x70~280 mm were submitted after 28 days of moist curing to 500 freeze-thaw cycles (freezing in air and thawing in water). To assess the degree of deterioration, changes in length, dynamic E, and mass were measured. The characteristics of the three hydrated cement pastes were determined by scanning electron microscopy and mercury intrusion porosimetry. The freeze-thaw durability of all mixes was found to be very good. Only three specimens (made with the cement containing 70% slag) deteriorated significantly, and this was due to high spacing factor (L) values of the mixes made with this particular cemen and containing no additives. It is concluded that the observed good performance of the slag cements is due to the very dense and uniform structure of the hydrated paste and its fine pore texture.
10.14359/6735
SP79-53
Jiro Murata, Michio Kawasaki, Takeshi Sakai, and Tadashi Kawai
The generally high resistance to freezing and thawing of concrete using ground blast-furnace slag as sand is noted, and from the standpoint of effective utilization of waste materials, development of positive uses for blast-furnace slag sand is studied.
10.14359/6736
SP79-54
Taketo Uomoto and Kazusuke Kobayashi
If a cement consisting mostly of blast-furnace slag and by-product gypsum becomes practical, it will not only contribute to energy saving, but will also result in the effective use of resources and industrial wastes. This report mainly investigates by experimentation the strength characteristics, surface deteriora-tion of the cement concrete and corrosion of reinforcing steel when using the above cement. The major findings of this research are: 1) The relation between compressive strength and water-cement ratio differs from that of ordinary portland cement and varies greatly depending on the degree of mixing. A general strength formula for this type of cement concrete is proposed. 2) The surface deterioration of the cement concrete, caused by carbon dioxide in the air, cannot be prevented by changing the proportion of cementing materials without changing other proper-ties. The most practical method is to apply coatings to the sur-face of concrete. 3) A fairly large amount of corrosion is observed on the surfaces of reinforcing steel in concrete at the age of four weeks. It is considered that the cause is the reaction productpf slag and gypsum, and inhibitor is effective in preventing corrosion.
10.14359/6737
SP79-55
Kazunobu Hirai
This paper presents the results of an investigation on the effect of blastfurnace slag on the frost resistance and poros-ity of neo-ferrite cement mortar. Neo-ferrite cement is a new type of ferrite cement produced from blastfurnace slag and con-verter slag that is a by-product of the steel industry. In this new cement, the amount of limestone as a raw material in cement production is reduced by approximately 2/3 in comparison with the ordinary portland cement. For the purpose of improving the durability of the cement, freezing and thawing tests were perpormed on prismatic mortars made from neo-ferrite cement incorporating three different amountsofslag by weight. The mortar specimen made from neo-ferritecementincorporating blastfurnaceslag approximately twenty percent (by weight) showed considerably improved resistance to frost action.
10.14359/6738
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