Faculty Profiles - AYANO Toshiki

Papers - AYANO Toshiki

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Biofouling on Steel Slag Hydrated Matrix in Enclosed Coastal Area Reviewed

MATSUNAGA Hisahiro, TANISHIKI Kazuho, FUZII Takashi, AYANO Toshiki

Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 65 ( 1 ) 1196 - 1200 2009

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers

Biofouling on a steel slag hydrated matrix using steel-making slag as the aggregate and ground granulated blast-furnace slag as the main binder was investigated in enclosed coastal areas, and was compared with that on concrete and a natural rocky shore. The steel slag hydrated matrix tended to display larger microalgal density and diversity than concrete from the initial period at the start of the test, confirming that microalgae readily grow on the steel slag-based material. At a seawall where large-scale works were executed, the biofouling on the steel slag hydrated matrix was equal or superior to that on the natural rocky shore. Based on these results, the steel slag hydrated matrix was judged to be excellent in biofouling performance.

File： 65_1196.pdf

DOI： 10.2208/kaigan.65.1196

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State of Natural Aggregate in Chugoku-Shikoku Area Reviewed

AYANO T.

Concrete Journal 46 ( 5 ) 57 - 58 2008.5

DRYING SHRINKAGE, AUTOGENEOUS SHRINKAGE, THERMAL STRAIN AND ELASTIC STRAIN OF STEEL-MAKING SLAG CONCRETE Reviewed

FUJII Takashi, FUJIKI Akihiro, AYANO Toshiki, SAKATA Kenji

Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering) 63 ( 3 ) 468 - 484 2007.8

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers

Steel-making slag concrete consists of by-products at ironworks. Steel-making slag concrete is expected as an environmentally friendly concrete. Steel-making slag concrete is used for foot protection block and small marine block, now. The purpose of this study is to enlarge the cover field of steel-making slag concrete productions. In this paper, elastic strain, thermal strain, autogeneous shrinkage strain and drying shrinkage strain of steel-making slag concrete are compared with those of normal cement concrete. Autogeneous shrinkage of steel-making slag concrete is very small due to high water absorption of steel-making slag, even when water to binder ratio of the concrete is quite small. Drying shrinkage strain at ultimate drying time of steel-making slag concrete is much bigger than that of normal cement concrete. Furthermore, drying shrinkage strain of steel-making slag concrete develops at a very low rate. They are due to the effect of high water absorption of steel-making slag. When drying shrinkage strain of steel-making slag concrete is predicted by JSCE model, water content in aggregate must be taken into consideration. On the other hand, Young's modulus, thermal expansion coefficient of steel-making slag concrete is as same as those of normal cement concrete. The effect of type of aggregate on those coefficients is small. As shown in this paper, the deformation of steel-making slag concrete can be predicted in design. It is possible to utilize the steel-making slag concrete in manufacturing of plain concrete structures such as large precast concrete armour unit or concrete block for retaining wall and revetment.

File： 63_468.pdf

DOI： 10.2208/jsceje.63.468

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RESISTANCE TO FREEZING AND THAWING OF STEEL-MAKING SLAG CONCRETE AND THE IMPROVEMENT Reviewed

FUJII Takashi, FUJIKI Akihiro, AYANO Toshiki, SAKATA Kenji

Journal of Japan Society of Civil Engineers, Ser. E1 (Pavement Engineering) 63 ( 2 ) 262 - 273 2007.5

Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers

Steel-making slag concrete consists of by-products at ironworks. The strength of steel-making slag concrete is 20-50 N/mm² at 28 days. Ground granulated blast furnace slag is used as a binder. Steelmaking slag is used as an aggregate. Steel-making slag concrete doesn't use any natural aggregate, either. The calcium hydroxide leaching from steel-making slag acts as alkali activator of ground granulated blast furnace slag. Steel-making slag concrete can be hardened by itself without any cement. Resistance to carbonation of steel-making slag concrete and resistance to corrosion of steel rod in steel-making slag concrete are high for a long time due to calcium hydroxide leaching from steel-making slag. However, resistance to freezing and thawing of steel-making slag concrete is quite low. In this paper, the mechanism of low resistance to freezing and thawing was clarified. The method to improve the durability of steel-making slag concrete was shown. An entrained air by AE agent is formed by calcium ion. The paste just with ground granulated blast furnace slag cannot contain entrained air by AE agent because enough calcium ions cannot be produced by the hydration with water and ground granulated blast furnace slag. Big size air is formed around steel-making slag because of calcium hydroxide leaching from the steel-making slag. That's why resistance to freezing and thawing is low. In order to improve the resistance to freezing and thawing of steel-making slag concrete, it's necessary to use cement, fly ash and blast furnace slag sand. Cement is used to entrain the air by AE agent. Fly ash is used to consume the extra calcium hydroxide in steel-making slag concrete. Blast furnace slag sand is used to restrain the calcium hydroxide leaching from sand. Then, the resistance to freezing and thawing of steel-making slag concrete is as high as that of AE cement concrete.

File： 63_262.pdf

DOI： 10.2208/jsceje.63.262

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PREDICTION EQUATIONS FOR CREEP AND DRYING SHRINKAGE IN CONCRETE OF WIDE-RANGING STRENGTH Reviewed

Kenji Sakata, Tatsuya TSUBAKI, Shoichi INOUE, Toshiki Ayano

Concrete Library International 40 145 - 166 2002.10

Drying, moisture distribution, and shrinkage of cement-based materials Reviewed

T. Ayano, F. H. Wittmann

Materials and Structures 35 ( 3 ) 134 - 140 2002.4

PREDICTION EQUATIONS OF CREEP AND DRYING SHRINKAGE STRAIN FOR WIDE-RANGED STRENGTH CONCRETE Reviewed

SAKATA Kenji, TSUBAKI Tatsuya, INOUE Shoichi, AYANO Toshiki

Doboku Gakkai Ronbunshu 690 ( V-53 ) 1 - 19 2001.11

Authorship：Corresponding author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Society of Civil Engineers

According to the enhanced performance of concrete and the generalization of high strength concrete, the model code is improved to cope with them. The prediction equations of creep and shrinkage for high strength concrete are also indispensable to the present model code.<br>In this study, the precision of the present prediction equations was examined by using some data bases. The reliable knowledge of the effect of concrete strength on creep and shrinkage was also derived from the data included in these data bases. New prediction equations proposed in this paper are very simple and available for wide-ranged strength concrete creep and shrinkage.

File： 2001_1.pdf

DOI： 10.2208/jscej.2001.690_1

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MOISTURE DISTRIBUTION,DIFFUSION COEFFICIENT AND SHRINKAGE OF CEMENT-BASED MATERIALS Reviewed

AYANO Toshiki, SAKATA Kenji, Folker H. WITTMANN

Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 634 ( 634 ) 387 - 401 1999.11

STUDY ON NON-LINEAR CREEP PREDICTION EQUATION OF CONCRETE Reviewed

Kenji SAKATA, Toshiki AYANO

Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 451 ( 451 ) 179 - 188 1992.8

Study on creep strain of concrete under the various stress histories. Reviewed

SAKATA Kenji, AYANO Toshiki

Doboku Gakkai Ronbunshu 1992 ( 451 ) 205 - 214 1992.8

Language：Japanese Publisher：Japan Society of Civil Engineers

Most of widely-used creep analysis methods of concrete are on the basis of principle of superposition, and the creep coefficient used in the analysis is constant irrespective of subjected stress. Hence, the non-linear phenomena of creep are frequently neglected in the actual design. We clarify that the creep strain of concrete under the various stress histories is non-linear phenomena strongly affected by the maximum stress. When we treat creep as non-linear phenomena, we need creep hardening rule to calculate the creep strain under the changing stress. Many creep hardening rules have already proposed. For example, there are strain hardening rule, time hardening rule, work hardening rule and so on. These creep hardening rules are proposed for metal materials not for concrete. We will propose the creep hardening rule which can be applied to creep problem of concrete under any condition.

File： 1992_205.pdf

DOI： 10.2208/jscej.1992.451_205

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高炉スラグ細骨材を用いたコンクリートの圧縮強度にカルシウムシリケート系硬化促進剤が与える影響 Reviewed

丁上, 森本充, 田中麟, 藤井隆史, 綾野克紀

コンクリート構造物の補修, 補強, アップグレード論文報告集 24 77 - 82 2024.10

The Effect of Calcium Silicate Type Accelerator on the Freeze-Thaw Resistance of Concrete Using Blast Furnace Slag Fine Aggregate Reviewed

Shang DING, Mitsuru MORIMOTO, Takashi FUJII, Toshiki AYANO

Proceedings of the Japan Concrete Institute 46 ( 1 ) 709 - 714 2024.6

Effect of treatment method of construction joint surface on adhesive strength of construction joints

Takashi FUJII, Hisashi ANDO, Isamu YAMAUCHI, Toshiki AYANO

Proceedings of the Japan Concrete Institute 46 ( 1 ) 283 - 288 2024.6

粗骨材の品質がコンクリートの乾燥収縮ひずみに与える影響 Reviewed

藤井隆史, 丁上, 谷口高志, 綾野克紀

コンクリート工学年次論文集 45 ( 1 ) 244 - 249 2023.6

Characteristics of concrete using granulated blast furnace slag sand from different manufacturers Reviewed

Proceedings of the Japan Concrete Institute 44 ( 1 ) 112 - 117 2022.6

Effect of freezing speed and freezing period on freeze-thaw resistance in salt water of mortar Reviewed

Proceedings of the Japan Concrete Institute 44 ( 1 ) 580 - 585 2022.6

Permeability of Concrete Using Granulated Blast Furnace Slag Reviewed

21 115 - 120 2021.10

セメント種類と養生方法がコンクリートの性能に与える影響 Reviewed

河中涼一, 藤井隆史, 綾野克紀

第29回プレストレストコンクリートの発展に関するシンポジウ論文集 273 - 278 2020.8

粗骨材がコンクリートの凍結融解抵抗性に与える影響 Reviewed

藤井隆史, Wang],L, 綾野克紀

コンクリート構造物の補修，補強，アップグレード論文集20 285 - 290 2020.8

CORROSION INHIBITION EFFECT OF CONCRETE WITH BLAST FURNACE SLAG SAND Reviewed

Takashi Fujii, Ryoichi Kawanaka, Toshiki Ayano

Advances in Construction Materials (Proceedings of ConMat'20) 2020.8

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