成果報告書詳細
管理番号20150000000450
タイトル*平成26年度中間年報 SIP(戦略的イノベーション創造プログラム)/インフラ維持管理・更新・マネジメント技術 構造物の補修・補強・更新に関する個別材料技術の研究開発 超耐久性コンクリートを用いたプレキャスト部材の製品化のための研究開発 (2)
公開日2016/4/1
報告書年度2014 - 2014
委託先名ランデス株式会社
プロジェクト番号P14031
部署名電子・材料・ナノテクノロジー部
和文要約
英文要約Practical Application of Precast Concrete Member with Super-High Durability Concrete
Landes co., LTD.

The water to binder ratio of 25% of concrete containing blast furnace slag has been manufactured and observed for quality control for over 6 months. The process capability index of quality management was 0.29 to 0.70. Unfortunately, the manufacturing cost of Hi-result with a water to cement ratio of 25% is too high and the manufacturing process is almost 2 times longer when compared to the process of manufacturing normal concrete. Moreover, the manufacturing efficiency is too low.
To manage the manufacturing time of concrete containing blast furnace slag that it is the same as normal concrete, concrete containing blast furnace slag with a water to binder ratio of 35% was used. The compressive strength and durability test of concrete containing blast furnace slag was investigated through the use of core samples which were drilled out of the hardened concrete. The result of compressive strength of concrete due to the casting height shows less variation than concrete containing blast furnace slag with a water to binder ratio of 25%. Concrete containing blast furnace slag with a water to binder ratio of 35% has a higher bleeding ratio when compared to Hi-result with a water to binder ratio of 25%. Overall, the blast furnace slag sand in concrete did not produce any significant data regarding an improvement to the resistance to freeze and thaw of concrete.
To investigate the effect of the bleeding ratio on the resistance to freeze and thaw of concrete, the resistance to freeze and thaw of concrete containing blast furnace slag with a water to binder ratio of 35% and a variation of water content from155 kg/m3 to 195 kg/m3 were experimented upon. It was found that, as the water content of concrete is increased, so does the ratio of bleeding in concrete. A higher ratio of bleeding results in a lower compressive strength of concrete. The concrete mixed by the actual mixer shows a higher bleeding ratio when compared to concrete mixed by the laboratory mixer. Since the bleeding decreases the resistance to freeze and thaw, the suppression of bleeding in concrete is very important for concrete containing blast furnace slag sand when it is used commercially.
The use of a separation reducing agent in the Hi-result with a water content of 195 kg/m3 improves the low ratio of bleeding of concrete, thereby significantly improving the resistance to freeze and thaw of concrete. The value of the relative modulus of elasticity is over 90% due to 300 cycles of the resistance to freeze and thaw test.
The manufacturing efficiency of concrete using the separation redacting agent is almost the same as concrete with a water to binder ratio of 35%. The concrete with a water to binder ratio of 35% and a separation reducing agent mixed by the actual plant will be investigated in future research. The process capability index of quality management will be investigated over a period of one year. Furthermore, a manufacturing method with a capable aim to reduce manufacturing costs without lowering the performance and durability of concrete will be investigate as well.
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