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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 34 Abstracts search results
Document:
SP119-03
Date:
September 1, 1989
Author(s):
A. J. Ulshizer, J. J. Ucciferro and G. E. Gray
Publication:
Symposium Papers
Volume:
119
Abstract:
Describes the expanded achievements possible in concrete placements with the aid of superplasticizers and identifies the importance of preplacement testing and planning to determine structural performance and placing characteristics and limitations. Diff
DOI:
10.14359/2399
SP119-04
K. Mitsui, H. Kasami, Y. Yoshioka, and M. Kinoshita
Gives results of laboratory investigations to determine the effect of a slump-retaining-type high-range water reducer. Various effects such as temperature, mix proportions, and admixture dosages on rheological and mechanical properties of concrete before and after hardening of concrete were examined. Slump, air content, and flow were tested after mixing. Setting time and bleeding were also measured. The hardened concrete was tested for strength, modulus of elasticity, shrinkage, and durability. The results indicated that it was possible to produce workable high-strength concrete and retain its workability by the admixture better than conventional superplasticizers. Higher temperature at mixing resulted in the retention of high workability. Too much admixture delayed the setting time, while no other adverse effects were noticed on mechanical properties of hardened concrete.
10.14359/2409
SP119-05
E. Ista and A. Verhasselt
In addition to a quickly obtained distinction between plasticizer and superplasticizer by means of a deflocculation test, it seems useful to complete this information by identifying their nature and chemical composition. Infrared spectrography, emission spectrometry, and wet chemical methods were applied to characterize various plasticizers. Methods employed were found to distinguish easily the various types of potential composition for such materials. They are therefore useful not only in establishing conformity of an admixture to previously submitted samples but also can discover the presence of potentially deleterious components.
10.14359/2420
SP119-06
J. Khorami and P. C.
Presently, most of the commercial superplasticizers used in concrete are characterized by their chemical formulation (melamine or naphthalene), their specific gravity, and their solid content. However, from a practical point of view, it is observed that t
10.14359/2430
SP119-08
Y. Sekiguchi, T. Okada, and T. Ukigai
Effects of calcium polystyrene sulfonate-based superplasticizer (SP.PSS-Ca) and sodium b-naphthalene sulfonate-based superplasticizer (SP.NSF-Na) on concrete behavior were studied. The SP.PSS-Ca does not contain sodium and potassium (Na, K), the cause of alkali-aggregate reaction, and hence is less harmful than SP.NSF-Na. SP.PSS-Ca gave a larger increase of slump, smaller increase of air content, smaller air loss, and slump loss than SP.NSF-Na at the same dosage. The dosage of SP.PSS-Ca was 70 percent of that required for SP.NSF-Na to obtain the required slump. SP.PSS-Ca did not increase the air content to flowing concrete of base concrete, but SP.NSF-Na increased it. SP.PSS-Ca showed lower air loss and slump loss (0.6 percent, 3.5 cm/90 min) than SP.NSF-Na (2.0 percent, 7.0 cm/90 min). Other properties such as bleeding, setting time, and compressive strength were similar with SP.PSS-Ca and SP.NSF-Na. Thus SP.PSS-Ca can be considered to have better properties as a superplasticizer than SP.NSF-Na.
10.14359/2437
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