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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:
SP114-76
Date:
May 1, 1989
Author(s):
Jan Bijen and Hennie Waltje
Publication:
Symposium Papers
Volume:
114
Abstract:
Cements consisting of 60 percent ground granulated blast furnace slag and 40 percent fly ash activated by 7 percent sodium hydroxide have been investigated. Various slags were used, including some laboratory-made synthetic slags. The influence of additives like superplasticizers and defoaming agents has been examined. The most favorable composition with respect to strength development has been subjected to a durability testing program. A negative aspect appeared to be the carbonation resistance, which is low in comparison with portland cement. Carbonation leads to a decrease in strength. Other properties were favorable.
DOI:
10.14359/1900
SP114-37
Magne Maage
The term "efficiency factor" for condensed silica fume in concrete can be defined as the number of parts of cement that may be replaced by one part of silica fume without changing the property studied. This factor was first introduced for concrete compressive strength after 28 days curing in water at 20 C. In this situation, factors around 3 to 4 are reported. However, if the concrete is exposed to other temperatures, other curing conditions, or other curing periods, the factor may be as low as zero. This is very important information for the practical application of silica fume, especially when forms have to be stripped very early in winter concreting. The durability of concrete structures is more in focus than ever. When studying durability, the efficiency factors of silica fume in concrete can be calculated at the same time. Durability efficiency factors are also affected by the curing conditions. A comprehensive research program has enabled efficiency factors to be calculated for different conditions. This has covered strength and durability parameters such as permeability, carbonation, and chloride penetration. This work will be a helpful indication of how silica fume can be used in the most efficient way in concrete structures.
10.14359/2385
SP114-38
Motoharu Tamai
Cement paste with silica fume was used to improve strength and other characteristics of no-fines concrete. The results showed that by using cement paste with silica fume and superplasticizer, apparent viscosity and yield value of the paste in the fresh stage can be controlled. The compressive strength of no-fines concretes with silica fume is in the range of 20 to 47 MPa. Other characteristics such as flexural and splitting strengths, modulus of elasticity, and frost resistance of no-fines concrete are improved. The coefficient of water permeability varies depending on the amount of the continuous void and binder. A value of 2 to 50 mm/sec can be obtained.
10.14359/2395
SP114-39
K. Ohno, and F. Alhara
The effect of finely ground silica with a high specific surface of about 12 mý/g and 20 mý/g in mortar was compared with that containing silica fume. The dosage requirement of a high-range water-reducing agent to maintain a constant flow of fresh mortar was determined for 1:3 mortar containing 5 to 25 percent finely ground silica or silica fume as cement replacement. The compressive and flexural strengths of the mortar were investigated at different ages. Also, the resistance of mortar specimens to chemical attack and chloride penetration was determined. It was concluded that the use of finely ground silica was as effective as silica fume for improving quality of mortar.
10.14359/2405
SP114-40
M. Berra, G. Ferrara, and S. Tavano
The effectiveness of silica fume to improve the erosion resistance of cement mortars used to repair hydraulic structures was investigated. The mortars were fiber-reinforced and contained a superplasticizer. Other factors investigated were erosion resistance, mechanical properties, shrinkage, atmospheric, under vacuum absorption, freeze-thaw resistance, and adhesion of mortars to concrete substrates.
10.14359/2414
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