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成果報告書詳細
管理番号20170000000607
タイトル*平成28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2018/3/8
報告書年度2016 - 2016
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IoT推進部
和文要約
英文要約Title: Practical Application of Precast Concrete Member with Super-High Durability Concrete (FY2014-FY2018) FY2016 Annual Report

(1) Fatigue Life in Water Condition of Concrete with Blast Furnace Slag Sand Subjected to Freeze-Thaw Attack
The fatigue of concrete suffered from freeze and thaw attack depends on the type of binder. When the crushed sand is used, the fatigue of concrete with high early strength Portland cement suffered from freeze and thaw attack is lower than that with ordinary Portland cement. When blast furnace slag sand is used, the tendency is almost same as when crushed sand is used. However, when blast furnace slag sand is used, the fatigue of concrete suffered from freeze and thaw attack can be improved with water curing period. Blast furnace slag sand reacts with water and improve the durability of concrete. In the concrete subjected to freeze-thaw action, even if the relative dynamic modulus of elasticity does not decrease, the compressive strength decreases. The decrease in the fatigue life of concrete due to the freeze-thaw action can be explained by the reduction in compressive strength caused by the freeze-thaw action.
(2) Fatigue life of mortar with blast furnace slag sand and fatigue life of RC slab subjected to wheel load running
In the study on fatigue life of BFS mortar, a stress-strain model under compressive fatigue load in air and water was developed. By using this model, it is possible to represent the difference in deformation characteristics from general mortar, and to obtain the deformation and fatigue life at the time of fatigue fracture.
In the study on fatigue life of RC slab subjected to wheel load running, considering that the RC slab subjected to the wheel load running eventually becomes beamed and destroyed, A method for predicting the fatigue life of RC slabs was proposed in consideration of the drying and wet environmental conditions and the effect of the distribution bars in the shear strength model of the bar members of the JSCE standard specifications for concrete structures. By using this method, it is possible to rationally consider the effect of the running position of the wheel and the effect of the variation of the load. Increase in fatigue life of BFS concrete slab when simultaneously freezing and thawing and fatigue loading can be expressed by coefficients showing the effect of environmental conditions in the fatigue life prediction method developed this time.
(3) Evaluation of the effect of quality of blast furnace slag sand on chloride diffusivity by electrical resistivity
It is investigated the effect of quality of blast furnace slag sand on chloride diffusivity by electrical resistivity which is an index for evaluating the chloride diffusivity of concrete easily and quickly. The electrical resistivity of concrete after curing in water becomes larger as the water absorption of BFS becomes smaller. Even with low quality BFS, the electrical resistivity increases with time. It is inferred that the hydration reaction occurred inside or around the BFS and the mortar densified.
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