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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 34 Abstracts search results
Document:
SP119-01
Date:
September 1, 1989
Author(s):
V. M. Malhotra
Publication:
Symposium Papers
Volume:
119
Abstract:
Traces the development of superplasticizers in Japan and Germany, and discusses the properties of superplasticized fresh and hardened concrete. Data are presented on the use of superplasticizers in Australia, Canada, Japan, Singapore, U.K., U.S., and Western Europe. The performance of superplasticized concrete under freezing and thawing conditions both in the laboratory and the field is discussed, and the use of superplasticizers in the development of innovative concretes is described. The ASTM and Canadian specifications dealing with superplasticizers are discussed, and the paper is concluded with a list of pertinent references.
DOI:
10.14359/2253
SP119-17
Y. Ohama, K. Demura, Y. Satoh, K. Tachibana, and Y. Miyazaki
The basic principle of preventing the deterioration of reinforced concrete structures is to inhibit the wet corrosion of reinforcing bars. According to the principle, the effective inhibition of the penetration of carbon dioxide, oxygen, water, and chloride ions is required to make highly durable concrete. Mortars are prepared with various contents of chemical admixtures and cement modifiers to meet such requirements, and tested for strength, water absorption, chloride ion penetration, and carbonation. From the test results of the mortars, effective admixtures are selected for concrete mixes. The strength, chloride ion penetration, carbonation, and drying shrinkage of concretes containing the selected admixtures are examined. In conclusion, the simultaneous addition of polymer dispersions and alkyl alkoxy silane at a polymer-cement ratio of 0.5 percent is recommended for the highly durable concrete.
10.14359/2509
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
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