研究者詳細 - 綾野　克紀

Influence of Coarse Aggregate on the Shrinkage of Normal and High-Strength Concretes

その他リンク： http://dl.ndl.go.jp/info:ndljp/pid/10637275

CRACKING CONTROL OF CONCRETE STRUCTURES UTILIZING FIBER COMPOSITE MATERIALS

Mahmoud Abo El-Wafa, Toshiki Ayano, Osamu Kuramoto, Kenji Sakata

Third Middle East Symposium on Structural Composites for Infrastructure Applications 2002年

EFFECT OF CRACKING ON SERVICEABILITY OF FIBROUS CONCRETE

Toshiki Ayano, Mahmoud Abo, El-Wafa Ahmed, Kenji Sakata

Proceeding of the 10th International Conference on Fracture, ICF10069 2001年12月

ポリプロピレン繊維によるコンクリートの補強効果に関する研究査読

綾野克紀, Mahmoud Abo, El-Wafa Ahmed, 矢吹増男, 阪田憲次

複合劣化コンクリート構造物の評価と維持管理計画に関するシンポジウム論文集 73 - 78 2001年3月

Adam Ihab, 阪田憲次, 綾野克紀

岡山大学環境理工学部研究報告 6 ( 1 ) 41 - 45 2001年2月

記述言語：英語掲載種別：研究論文（大学，研究機関等紀要）出版者・発行元：岡山大学環境理工学部

Inclusion of aggregates leads to a reduction in drying shrinkage of cement paste. This is due to the elastic deformation of the aggregates that partly restrains the shrinkage deformation of cement paste. Hence, concrete with higher aggregate content exhibits smaller shrinkage. In addition, concrete with aggregates of higher modulus of elasticity or of rougher surfaces is more resistant to shrinkage process. In this paper the effects of the type of coarse aggregate on the shrinkage of normal and high-strength concretes are investigated. Two different types of crushed stone were used as coarse aggregates to produce the concrete mixtures used in this study. For each coarse aggregate type, two normal-strength concrete (NSC) mixtures and two high-strength concrete (HSC) mixtures were prepared. The 28-day compressive strength values of NSC mixtures were about 35 and 50 MPa, while those of HSC mixtures were 70 and 100 MPa, respectively. All shrinkage specimens were cured in water for 14 days after casting, then exposed to drying under the conditions of constant temperature (20℃) and relative humidity (60%). It has been shown that the type of the coarse aggregate influences shrinkage behaviour of both normal and high-strength concretes.

その他リンク： http://eprints.lib.okayama-u.ac.jp/11529

炭酸銅を用いたコンクリートの遅延特性に関する研究査読

吉川寛和, 綾野克紀, 阪田憲次

コンクリート工学年次論文報告集 23 ( 2 ) 91 - 96 2001年

Influence of coarse aggregate on the creep of normal and high-strength concretes 査読

Adam, I, T Ayano, K Sakata, O Kuramoto

2001 SECOND INTERNATIONAL CONFERENCE ON ENGINEERING MATERIALS, VOL II 173 - 182 2001年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：CANADIAN SOCIETY CIVIL ENGINEERING

Concrete is an aging material, i.e. its properties developing with time due to the chemical reaction of cement and water. Time-dependent behavior of concrete is influenced by a large number of factors, internal and external, that generally depend upon materials properties and environmental conditions. The restraint imposed by the aggregate depends on the stiffness and volume fraction of aggregate in the concrete. In this paper the influence of the type of coarse aggregate on the mechanical properties and creep of normal and high-strength concretes is investigated. Crushed basalt and clay slate were used as coarse aggregates to realize the concrete Mixtures. For each aggregate type, two normal-strength concrete mixtures and two high-strength concrete mixtures were prepared.

Web of Science

Resistance to cracking due to drying shrinkage by polypropylene fiber 査読

T Ayano, MA El-Wafa, M Yabuki, K Sakata

2001 SECOND INTERNATIONAL CONFERENCE ON ENGINEERING MATERIALS, VOL I 705 - 712 2001年

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）出版者・発行元：CANADIAN SOCIETY CIVIL ENGINEERING

In this paper, the effect of polypropylene fiber, which does not rust even in the sea water, on resistance to cracking due to drying shrinkage was examined. Especially, the effect of size, shape and hydrophilic treatment to enhance the adherence between concrete and fiber were investigated. It will be shown that there is an optimum size and shape of polypropylene fiber for the resistance to cracking due to drying shrinkage and that the type of hydrophilic treatment for polypropylene fiber greatly influences the slump of concrete but not its resistance to cracking.

Web of Science

コンクリート用細骨材としての銅スラグの有効利用に関する研究(<特集>コンクリート用骨材・混和材料) 査読

綾野克紀, 蔵本修, 阪田憲次

材料 49 ( 10 ) 1097 - 1102 2000年10月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：社団法人日本材料学会

Copper slag is a by-product yielded from a copper refinery. The annual amount of copper slag in Japan is two million tons. The copper slag has been used for cement material, sand blasting, reclamation and so on. However, most of the copper slag is stacked high as waste since the production exceeds demand. This study on the application of copper slag as fine aggregater for concrete has been started with the expecation of large amounts of consumption. Many researchers have already found it possible to use a copper slag as a concrete aggregate. However, it also has been clear that the concrete with copper slag has some problems. One of them is excess bleeding attributed to the glassy surface of copper slag. Another problem is the delay of setting time of concrete with copper slag nevertheless it produced at the same refinery. The delay of setting time is more than one week in some cases although the durability in concrete is not affected by it. In this paper, the strength, setting time and durability of concrete with copper slag is clarified. It is shown that the delay of setting time does not have a negative influence on durability. Furthermore, the solution will be given in this paper.

添付ファイル： 49_1097.pdf

DOI： 10.2472/jsms.49.1097

2055 ポリオレフィン系補強繊維を用いたコンクリートの乾燥収縮ひび割れに対する抵抗性に関する研究(短繊維(材料),連続繊維(材料)) 査読

その他リンク： https://jlc.jst.go.jp/DN/JALC/00070328325?from=CiNii

Factors affecting creep and shrinkage of high-strength concrete : Part Ⅱ 査読

Adam I, Toshiki Ayano, Kenji Sakata

the 8th Arab Structural Engineering Conference 2000年8月

綾野克紀, 阪田憲次, 矢吹増男, 細田常正

コンクリート工学年次論文集 22 ( 2 ) 325 - 330 2000年6月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：日本コンクリート工学協会

本研究は,海水中でも錆びることのないポリオレフィン系補強繊維を混入することによるコンクリートの乾燥収縮ひび割れに対する抵抗性の改善効果について検討を行ったものである。とくに,ポリオレフィン系補強繊維の寸法,形状およびコンクリートとの親水性を高めるために施された表面処理方法の及ぼす影響について検討を行った。その結果,乾燥収縮ひび割れに対して最も効果のある繊維の太さおよび形状の存在すること,また,親水性を高めるために繊維に施される表面処理方法は,スランプに対しては大きな影響を及ぼすが,乾燥収縮ひび割れに対する影響は小さいことが明らかとなった。

添付ファイル： 022-01-2055.pdf