成果報告書詳細
管理番号20150000000401
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 (1)
公開日2016/12/29
報告書年度2014 - 2014
委託先名国立大学法人岡山大学
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
Okayama University

1. Performance for resistance to slab deterioration
Many concrete slabs have been deteriorating and turning into soil. Concrete slabs are deteriorated by many factors; cyclic loading of live load, freezing and thawing action, dispersed salt in winter, ASR, and so on. They affect the structural soundness not independently but coincidently. It was confirmed this year that concrete member with granulated blast furnace slag sand suffering from both cyclic load and freezing and thawing action has much higher durability than that with normal sand.
PC member and RC member were prepared for test. The size and design flexural strength of each specimen are the same. The applied cyclic load was also the same level. As for PC member, the stress amplitude of upper side concrete is much bigger than that of reinforced steel. Therefore, the collapse of upper side concrete by cyclic load damages PC member. Conversely, as for RC member, the stress amplitude of reinforced steel is much bigger than that of upper side concrete. So, the breakage of reinforcement by cyclic load leads RC member to destruction. 200,000 loading cycles and 30 cycles of freezing and thawing action in NaCl solution of 10 mass% applied to specimens, alternatively.
The reinforcement of RC member with normal sand broke at 240 cycles of freezing and thawing action and 1,600,000 cycles of loading. The upper side concrete of PC member broke at 360 cycles of freezing and thawing action and 2,300,000 cycles of loading. Whereas, RC member and PC member with granulated blast furnace slag sand did not break until 600 cycles of freezing and thawing action and 4,000,000 cycles of loading.
The performance of concrete with normal sand is as almost same as that with granulated blast furnace slag sand. However, the performance of concrete member with granulated blast furnace slag sand is much higher than that with normal sand. The research theme of the next year is to clarify the enhancement mechanism by granulated blast furnace slag sand.
2. Carbonation, chloride penetration, drying shrinkage, and creep
It is well known that chloride penetration of concrete with ground granulated blast furnace slag is smaller than that without it. However, ground granulated blast furnace slag has a defect that it promotes the carbonation of concrete. It was confirmed this year that the chloride penetration of concrete with granulated blast furnace slag sand can be restrained without promoting carbonation.
The effect of ground granulated blast furnace slag on time dependent strain is small. However, granulated blast furnace slag sand can make drying shrinkage and creep smaller. This fact means that concrete with blast furnace slag sand is useful to the concrete of PC member. Furthermore, it was confirmed that granulated blast furnace slag sand can control the alkali silica reaction of concrete. We will demonstrate an advantage of granulated blast furnace slag sand on durability of real size concrete member by exposure test next year.
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