A Study on Effects of Mix Proportions and Curing Methods on Air Permeability of Concrete Pillar Members
| Autor: | SAITO, Masato, SAWAMOTO, Takehiro, SHITAMA, Koichiro, HIGUCHI, Masanori |
|---|---|
| Jazyk: | japonština |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | ものつくり大学紀要. (9):6-11 |
| ISSN: | 2185-3746 |
| Popis: | The properties of concrete surface which influence the durability of concrete structures will be greatly affected on mix proportions and curing conditions. In this study, the effects of nominal strength, type of cement, demolding timing and curing method on air permeability of concrete were investigated. As a result,curing method supplying water from outside of the concrete was most effective to do the coefficient of air permeability small in case of the normal portland cement. Curing method which didn’t make water dry from the concrete surface was effective to do the coefficient of air permeability small in case of the portland-blast furnace slag cement typeB. And then appropriate curing was effective for air permeability small than increase of concrete strength. Therefore, there was no clear correlation between the coefficient of air permeability and the concrete strength. However, there was correlation between the coefficient of air permeability and the sound speed of concrete surface. The coefficient of air permeability tended to be small that the sound speed of concrete surface became speedy. And the coefficient of air permeability tended to be small that the water content of concrete became high. 本研究では，前年度に行った普通ポルトランドセメントおよび高炉セメントB 種 を用いた呼び強度27 の一般的なコンクリートの実験データ¹⁰⁾に加えて，高炉セメントB 種を用いて早期脱型を行った場合，さらに呼び強度36 の比較的強度の大きいコンクリートについて実験を行い，コンクリートの配合，脱型時期，および養生方法の相違と，透気係数，含水率，圧縮強度，反発度，さらに音速の関係について検討した． |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|