Title: Frost Resistance of Superplasticized Concrete
Author(s): M. Kobayashi, E. Nakakuro,
K. Kodama, and S. Negami
Publication: Symposium Paper
Appears on pages(s): 269-282
Keywords: admixtures; air-entraining agents; air en
freeze-thaw durability; microscopy; mix proportionin
cizers; water-cement ratio; water-reducing agents.
First, the paper shows the results of microscope analyses of concretes using three high-range water-reducing admixtures of different chemical compositions and having different water-cement ratios and air contents in order to determine the air-void systems of concretes containing high-range water-reducing admixtures, and also discusses the selection of the air-entraining admixture to be jointly used. Secondly, the paper deals with the relation between frost resistance and spacing factor based on the results of rapid freezing and thawing tests on concretes made with high-range water-reducing admixtures and further gives air contents or spac-ing factors required to give concrete adequate resistance to severe frost action. The results of tests on the effects of different kinds of high-range water-reducing admixtures on surface tension, foaming, and stability of air bubbles are given.