The examination of the chemicals on foaming action of the concrete and improvement on freeze-thaw resistance-proof in the cold region.

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1)The purpose. In the cold region, air foam has been taken in order to improve frost-proof of the concrete. However, the entrained of the air was unstable. I noticed borohydride chemicals which generated the hydrogen gas in always stabilizing, in reacting under the existence of the water as the technology which can form the bubble chemically. I noticed borohydride chemicals which generated the hydrogen gas in always stabilizing, in reacting under the existence of the water as the technology which can form the bubble chemically. Foaming test and freezing and thawing durability test were carried out in fiscal 1998, and in this chemical compound, it was clarified that there was sufficient frost-proof improvement effect. Permeability concrete of which the freezing and thawing durability was comparatively bad was tested in fiscal 1999.2)The experimental result. (1) The analysis of bubble characteristics in the hardening concrete. Bubble organization of the hardening concrete which added the borohydride chemicals was measured by the image analysis method. The data was carrying out the analysis, and the existence of the minute bubble which contributes to the frost-proof improvement was recognized. (2) The freeze/thaw test. On the permeability concrete, the hydrogenation boron chemical compound was added, and the freeze/thaw test of the concrete was carried out. As the result, permeability concrete which added this borohydride chemicals confirmed that the freezing and thawing durability is improved.3)The summary. From the above result, the bubble formed in the concrete by the chemical action of the hydrogenation boron chemical compound recognized the effect which improved frost-proof of permeability concrete of which the freeze-thaw resistance was bad until now. This technology the possibility of the practical application is sufficient, and the progress to the development research can be expected.