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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 90 Abstracts search results
Document:
SP132-53
Date:
May 1, 1992
Author(s):
Malvin Sandvik and Odd E. Gjorv
Publication:
Symposium Papers
Volume:
132
Abstract:
Silica fume has an accelerating effect on the early hydration of portland cement. Also, silica fume reduces the retarding effect of lignosulfates. At standard curing conditions, the contribution to strength from the pozzolanic reaction takes place primarily at 5 to 7 days. As a result, existing equations for prediction of strength development based on pure portland cement are no longer valid for concrete with silica fume. Some new equations for concrete with various contents of silica fume are presented.
DOI:
10.14359/2365
SP132-54
M. Kakizaki, H. Edahiro, T. Tochigi, and T. Niki
High-strength and ultra high-strength cast-in-place concretes tend to contain excessive unit volumes of cement when compared with normal concrete, and since the improvement of workability relies largely on the efficiency of the air-entraining and high-range water-reducing admixtures, the properties of workability (or consistency) are different from normal concrete. With high-strength concrete, it was found that the method of mixing concrete influenced flowability, strength properties, and pore structure; details of this influence are given.
10.14359/2375
SP132-55
G. G. Carette and V. M. Malhotra
Presents results of an investigation dealing with the long-term strength of silica fume concrete. Three series of concrete mixtures with and without silica fume were made with water-cementitious ratios from 0.25 to 0.40. The replacement level of portland cement with silica fume was kept constant at 10 percent. Test specimens were cast from each mixture to determine the compressive and flexural strengths of concrete at up to 3.5 years under both water-curing and air-drying conditions. The test specimens were also subjected to the determination of microstructure, carbonation, and weight changes with time. It is concluded that, under water-curing conditions, both the control and silica-fume concretes show gain in strength with age, with both concretes reaching similar strength levels after 3.5 years. However, continuous air-curing adversely affects the long-term compressive strength development of both types of concrete. This effect is considerably more marked for silica-fume concrete than for the control concrete, especially at w/c + sf of 0.30 and 0.40.
10.14359/2383
SP132-86
S. Kashima, M. Sakamoto et.
The Akashi Kaikyo Bridge, with a center span of 1990 m, will be the world's longest suspension bridge when it is completed in 1998. The two main tower foundations are being constructed in water. A total volume of about 500,000 m3 of antiwashout underwater concrete has been placed, and about 180,000 m3 of ordinary reinforced concrete is currently being placed. Since this antiwashout underwater concrete had to be placed over a wide area and placed about 10,000 m3 per pour, it was necessary to choose a low-heat, high-flowability concrete. The cement used for this antiwashout underwater concrete was a three-component type containing about 80 percent granulated blast furnace slag and fly ash. Report describes the physical properties and workability of the antiwashout underwater concrete and the results of construction.
10.14359/2234
SP132-59
T. Kandra, F. Sakuramoto, and K. Suzuki
Compressive strength of concrete with silica fume cured at high temperatures generated by heat of hydration during early age was studied. The curing temperatures simulated the site-curing conditions of structural members. Four types of aggregates and four types of admixtures were used, and a total of seven concrete samples were cured at four temperature conditions ranging from 20 to 75 C. Results indicated the following: 1) at higher curing temperatures, the 1-week strength was higher but the strength gain from 1 to 4 weeks tended to be low; 2) independent of curing temperature, the type of aggregate greatly influenced the strength, and the results were the same with all the admixtures; 3) high-temperature curing influenced concrete strength independently of the admixture and aggregate; 4) equivalent age at 20 C based on the Arrhenius equation gave a reasonable estimation of compressive strength gain.
10.14359/2423
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