砂の汚染と混和剤(<小特集>建設材料小特集)
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概要
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During the process of manufacturing fresh concrete, excess air of more than 3 % gets sometimes entrapped during the mixing operation without AE agent. This phenomenon is supposed to due to the surfaces of the fine aggregates of sand and admixtures made hydrophobic by their contamination. The following examinations have been conducted of 27 kinds of sand collected throughout our country. (1) Extraction of sand by ethanol/benzene (vol. ratio 1:2) (2) Examination of only layers of the extracted sand in respect of their water repellency (3) Examination of fine sand air resect of its water/kerosine interfare, respectively as it has been extracted and as it is to be extracted. As the result it has turned out that water repellent and hydrophobic and tends to cause excess air to be entrapped. Kerosine test is proposed to be an effective method to examine hydrophobicity of sand surface.
- 社団法人日本材料学会の論文
- 1971-01-15