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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 83 Abstracts search results
Document:
SP114
Date:
May 1, 1989
Author(s):
V M Malhotra
Publication:
Symposium Papers
Volume:
114
Abstract:
Fly Ash, Silica Fume, Slag, and Natural Pozzolans in Concrete: Proceedings of the Third International Conference presents the latest technological advances in the use of these extremely valuable mineral by products. This two-volume set of 83 papers explores in detail how you can conserve energy and resource while increasing your profitability. The first volume contains papers dealing with fly ash and natural pozzolans, and the second volume details the use of condensed silica fume and ferrous and non-ferrous slags. Note: The individual papers are also available as .pdf downloads.. Please click on the following link to view the papers available, or call 248.848.3800 to order. SP114
DOI:
10.14359/14147
SP114-19
C. Lee
Effects of alkalies in Class C fly ash on Alkali-aggregate reaction were studied by using two cements, a type I high-alkali cement and a type II low-Alkali cement, and three Class C fly ashes. Mortar bar expansion was measured according to ASTM C 441. Reaction products of alkali-aggregate reaction were examined n by XRD, SEM, and EDAX. were to study: The purposes of this research (1) the significance of the standard mortar bar test in determining the degree to which high and low-alkali cement could be replaced by Class C fly ashes, and (2) effect of fly ash alkali contents on alkali reactivity. Expansion of mortar bars prepared using high-alkali cement increased at low replacement levels but decreased at high replacement levels for curing periods up to 12 weeks at 38 C; whereas expansion of mortars prepared using low-alkali cement increased at all Levels of fly ash replacements up to 40% by volume. A critical equivalent Na20/Si02 mole ratio was identified and found to characterize alkali reactivity. No crys-talline reaction products could be identified by XRD. Results of SEM and EDAX showed that the reaction product was an alkali-silicate gel, composed mainly of silica, sodium, potassium, and calcium, with their relative amounts varying within the gel.
10.14359/10016
SP114-66
K. Kokubu, S. Takahashi, and H. Anzai
Portland cement was mixed with slags at different fineness and replacement levels and hydrated at 10, 20, 35, 50, and 65 C. The temperature rise of concrete containing slag was reduced when the slag replacement level was 70 percent. The hydration of slag was accelerated at temperatures between 20 and 35 C. The amount of heat liberated by the mixtures was greater than that of the reference portland cement at temperatures 35 C or higher. It is therefore evident that in mass concrete containing slag, the adiabatic temperature rise need not be lower than that of the concrete containing only portland cement.
10.14359/2606
SP114-65
Taketo Uomoto and Kazusuke Kobayashi
The compressive strength of blast furnace slag concrete containing slag/(cement + slag) ratios of 0, 0.3, 0.5, and 0.7 was followed by changing the curing conditions. The specimens were cured in air or water at 10, 20, or 40 C, and the strength development after 1, 4, 8, 13, and 26 weeks was determined. Equations were developed for strength based on maturity, curing, method, age of concrete, and amount of slag.
10.14359/2605
SP114-64
E. Tazawa, A. Yonekura, and S. Tanaka.
Blast furnace slag concrete was made with different w/c, slag fineness, and amounts of slag, and cured for different periods. Drying shrinkage in air at 50 percent relative humidity (RH) and 20 C and creep in water at 20 C and in air at 50 percent RH were measured for 300 days. Drying shrinkage of concrete with granulated blast furnace slag was larger at early drying time and was lower for longer drying times with respect to the reference concrete. Using slag of specific surface area of about 8000 cmý/g, drying shrinkage of slag mortar was larger at 3 days curing but was lower after curing for 28 days. Creep of slag concrete was similar to that on nonslag concrete at the same compressive strength for concrete cured for 28 days, but for that cured for 7 days, creep of slag concrete was lower than that of the nonslag concrete. In the slag concrete cured by standard curing, the pore volume of cement paste is smaller and the proportion of fine pores is larger than that of nonslag concrete.
10.14359/2604
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