CONCRETE PROPERTIES OF BLENDED CEMENT WITH HIGH ALUMINATE
| Autor: | Eiji Maruya, Toshiyuki Takahashi, Hidetoshi Misumi |
|---|---|
| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Cement Science and Concrete Technology. 66:353-358 |
| ISSN: | 2187-3313 0916-3182 |
| DOI: | 10.14250/cement.66.353 |
| Popis: | Concrete properties of blended cements with high aluminate were evaluated. As a result, fluidity of fresh concrete used these cements in normal mixture and high strength mixture was almost the same as that of the standard sample. Early age and long age strength of concrete used these samples were good. For durability of concrete, carbonation, freezing, thawing resistance and chloride ion penetration in the blended cements with high aluminate were unchanged compared with those of the standard sample. On the other hand, length change in drying shrinkage in blended cements became a little larger than the standard sample. Results of hydration analysis indicated that the increase of the amount of additives and CзA in cement promoted the generation of hemicarbonate in hardened cement paste. Porosity in 28 days of age became smaller than that in 7 days of age. As this reason, it was thought that hemicarbonate generated. Porosity of blended cements was not so different from that of the standard sample. But pore size distribution of hardened cement pastes with the increase of the amount of additives and CзA in cement differed compared with that of the standard sample, it shifted smaller. In this study, it was clarified that the blended cements with high aluminate in this investigation were available.廃棄物等の処理、品質確保およびCO₂ 削減という観点から、高CзA型混合セメントを対象に、耐久性を含めたコンクリート物性を調べた。その結果、流動性および強度へのCзA量の影響は小さいことがわかった。また、乾燥収縮、促進中性化、凍結融解抵抗性および塩分浸透性は、基準セメントと比較して問題となる差は認められなかった。水和解析の結果、混合材添加量の増加やCзA量の増加により、ヘミカーボネートの生成が活発になることがわかった。また、細孔径分布は小さい方に移動した。本検討の範囲において、高CзA型混合セメントは実用上、問題ないと考えられた。 |
| Databáze: | OpenAIRE |
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