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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
Date:
September 1, 1989
Author(s):
Editor: V.M Malhotra
Publication:
Symposium Papers
Volume:
119
Abstract:
To design and build state-of-the-art concrete structures, you need access to the latest information on materials and materials research. Bringing together the combined expertise of the chemical admixtures, cement, and concrete industries, Superplasticizers and Other Chemical Admixtures in Concrete will provide the answers you need on these important concrete admixtures. A collection of 33 papers, this ACI publication presents the latest findings on topics such as: superplasticizers--a global review with emphasis on durability and innovative concretes; reuse of returned concrete by hydration control; superplasticizers and concrete durability; evaluation of superplasticizers in concrete; chemical admixtures in concrete platforms; superplasticized concrete containing blast furnace slag; slump control with reactive polymeric dispersant; and physiochemical characterization of superplasticizers. 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. SP119
DOI:
10.14359/14152
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
SP119-07
A. Verhasselt and J. Pairon
Except for degree of effectiveness, plasticizers and superplasticizers have very similar effects on the workability of hydraulic mixtures. In a microscopic scale, however, their action clearly differs by the effective deflocculation and the high dispersion of the cement particles obtained with superplasticizers. This behavior was the basis of development of two test procedures. The first one makes it possible to discriminate between both types of admixture. Furthermore, it reveals possible specific interactions with the cement used and makes it possible to assess the period of activity of a superplasticizer. The second procedure allows easy and quick assessment of the minimum active dosage required of a superplasticizer for a given cement. Though often higher than the percentages recommended by the manufacturers, the values agree well with those obtained by a vibratory compaction test on cement mortar. This test also allows a quick assessment of the relative effectiveness of various superplasticizers. From a study on 17 admixtures and two cements (one portland and one with granulated slag), it appeared that: an admixture supplied as a plasticizer may actually be a superplasticizer; an admixture may behave as a plasticizer or as a superplasticizer according to the nature of the cement; and the period of activity of the superplasticizers was generally longer with the slag cement.
10.14359/2446
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