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成果報告書詳細
管理番号20170000000605
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(3)
公開日2018/3/8
報告書年度2016 - 2016
委託先名オリエンタル白石株式会社
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: Strategic Innovation Promotion Program, Maintenance, Renovation and Management Technologies for Infrastructures, Practical Application of Precast Concrete Member with Super-High Durability Concrete (FY2014-FY2018) FY2016 Annual Report

In order to obtain high durability of concrete using blast furnace slag sand, concrete mix, usage of admixtures, mixing procedures and curing methods have to be adequate. Then, freezing and thawing tests were performed as resistance performance against frost damage is the index of durability. It was found that use of thickener is the most important for concrete mix. Also, curing in water more than 7 days after the steam curing is necessary to get high durability. Therefore water curing pool was built for precast concrete members.
Specifications to get high durable concrete using blast furnace slag sand for precast members were decided. Then, in order to make sure the properties of concrete using blast furnace slag sand made following specifications, various tests were performed. Physical properties, durability properties were satisfied.
Precast prestressed concrete members were manufactured in a factory. The target is a pretentioned prestressed concrete slab deck for steel girder bridges designed for 3 m continuous span. Two deck slabs were manufactured and they are going to used for a wheel load running test will be performed in a few month.
Fatigue tests were carried out on beam specimens. The specimens are simulating precast concrete slab deck for steel girder bridges. Beam specimens consist of two precast members and a cast in situ joint with breadth of about 400 mm at the middle of the beam. Two beam specimens were used for the tests. One is made of conventional concrete and the other is made of concrete using blast furnace slag sand. Firstly, two million times peak to peak alternative load were applied. On upper surface of concrete at the middle of the beams, water was pooled during tests simulating leakage of rain water on the surface of the concrete slab deck of bridges. Displacements at the center of the specimens were almost the same for two specimens. For residual displacements of the specimen made of concrete using blast furnace slag sand were little smaller than those of the specimen made of conventional concrete. After two million times alternative loading, load were increased until failure of the specimens. The specimen made of concrete using blast furnace slag sand was broken more than the calculated bending strength. However the specimen made of conventional concrete was broken less than the calculated bending strength. This means bond strength of concrete using blast furnace slag sand for re-bars is superior to that of conventional concrete.
When precast concrete deck slabs are utilized for the construction of bridges, cast in situ concrete is unavoidable. Then a trial mix of cast in situ concrete using blast furnace slag sand was done in a ready mixed concrete factory. Properties of fresh concrete were fairly good and time dependent changes in slump and air content were allowable. The concrete was cast in a mould with arranging re-bars 90 minute after the mixing. The concrete was enough workable and in good conditions.
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