Faculty Profiles - AYANO Toshiki

Papers - AYANO Toshiki

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設計基準強度と呼び強度 Reviewed

綾野克紀, 名倉健二

コンクリート工学 63 ( 3 ) 219 - 223 2025.3

Freeze-thaw Resistance of Concrete using Ground Granulated Blast-furnace Slag and Blast-furnace Slag Sand in Salt Water Reviewed

Toshiki Ayano, Takashi Fujii, Kanako Okazaki

Journal of Advanced Concrete Technology 22 ( 5 ) 253 - 266 2024.5

FREEZE-THAW RESISTANCE OF CONCRETE USING GROUND GRANULATED BLAST FURNACE SLAG AND BLAST FURNACE SLAG SAND IN SALT WATER Reviewed

Toshiki AYANO, Takashi FUJII, Kanako OKAZAKI

Japanese Journal of JSCE 79 ( 12, 23-00042 ) 1 - 13 2023.12

モルタル小片を用いた高炉スラグ細骨材および高炉スラグ微粉末の耐凍害性向上効果に関する検討 Reviewed

能勢幸大郎, 橋野哲郎, 藤井隆史, 綾野克紀

コンクリート工学年次論文集 45 ( 1 ) 568 - 573 2023.6

粗骨材の品質および微粒分がコンクリートの凍結融解抵抗性に与える影響 Reviewed

谷口高志, 丁上, 藤井隆史, 綾野克紀

コンクリート工学年次論文 45 ( 1 ) 46 - 51 2023.6

Effect of binder and mix proportion on freeze-thaw resistance of concrete with polypropylene short fiber Reviewed

Proceedings of the Japan Concrete Institute 44 ( 1 ) 922 - 927 2022.6

けい酸塩系表面含浸材のスケーリング抑制効果に及ぼす施工方法の影響 Reviewed

森脇拓也, 大西豊, 藤井隆史, 綾野克紀

コンクリート工学年次論文集 43 ( 1 ) 1433 - 1438 2021.6

Improvement of Concrete Properties using Granulated Blast Furnace Slag Sand Reviewed

Toshiki Ayano, Takashi Fujii

Journal of Advanced Concrete Technology 19 ( 2 ) 118 - 132 2021.2

大気中環境下における塩化物イオンの見掛けの拡散係数の設定に関する一考察 Reviewed

皆川浩, 中村英佑, 藤井隆史, 綾野克紀

コンクリート工学年次論文集 41 ( 1 ) 767 - 772 2019.6

Effect of Suppressing Crack of Concrete by Urea Reviewed

H. Tanaka, T. Ayano

Concrete Journal 57 ( 1 ) 59 - 62 2019

Admixture for Improving Performance of Concrete Using Blast Furnace Slag Sand Reviewed

T. Ayano, T. Fujii

Concrete Journal 57 ( 1 ) 83 - 86 2019

Improvement of Durability of Precast Concrete Member by Granulated Blast Furnace Slag Sand Reviewed

Toshiki Ayano, Takashi Fujii, Kyoji Niitani, Katsunori Takahashi, Kazuyoshi Hosotani

Journal of Disaster Research 12 ( 3 ) 456 - 469 2017.6

Sulfuric Acid Resistance of Concrete with Blast Furnace Slag Fine Aggregate Reviewed

Paweena Jariyathitipong, Kazuyoshi Hosotani, Takashi Fujii, Toshiki Ayano

Journal of Civil Engineering and Architecture 8 ( 11 ) 1403 - 1413 2014.9

EFFECT OF TEMPERATURE HISTORY DURING CURING ON ULTIMATE DRYING SHRINKAGE OF CONCRETE

Toshiki AYANO, Takashi FUJII

Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 70 ( 4 ) 428 - 440 2014

RESISTANCE TO FREEZING AND THAWING ATTACK OF CONCRETE WITH BLAST FURNACE SLAG FINE AGGREGATE Reviewed

Toshiki AYANO, Takashi FUJII

Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 70 ( 4 ) 417 - 427 2014

EFFECT OF MEMBER SIZE ON DRYING SHRINKAGE OF CONCRETE Reviewed

KOBAYASHI Hitoshi, SAKIMOTO Tsutomu, FUJII Takashi, AYANO Toshiki, MIYAGAWA Toyoaki

Doboku Gakkai Ronbunshuu E 69 ( 4 ) 377 - 389 2013

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

Drying shrinkage of concrete is a phenomenon caused by moisture distribution of concrete. Moisture distribution of concrete causes because evaporable moisture transfers from inside to outside of concrete through the drying surface. The drying shrinkage near the drying surface is much bigger than that in the center of concrete at arbitrary drying time. However, when the ratio of the length to the thickness of concrete member is high such as a prism test specimen (100×100×400mm) or a bridge girder, the Navier hypothesis is applicable for the deformation due to drying shrinkage and the longitudinal total strain both drying shrinkage and elastic strain is consequently constant at any place in the section.<br> In general, the time-dependent strain due to drying shrinkage can be expressed by the hyperbolic equation. In other words, the time-dependent strain due to drying shrinkage with the lapse of time is expressed by two parameters, that is, the parameter for ultimate drying shrinkage strain and the parameter to express the change of strain by the lapse of time. In this study, the method to predict the drying shrinkage strain in full-scale structures by using drying shrinkage obtained by test according to JIS A 1129 test is proposed. As a result, it is shown that the parameter to express the change of strain by the lapse of time is proportional to the square of the representative member thickness.

File： 69_377.pdf

DOI： 10.2208/jscejmcs.69.377

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CRACKING DUE TO DRYING SHRINKAGE AND DRYING SHRINKAGE ANALYSIS BASED ON DIFFUSION THEORY Reviewed

KOBAYASHI Hitoshi, SAKIMOTO Tsutomu, FUJII Takashi, AYANO Toshiki, MIYAGAWA Toyoaki

Doboku Gakkai Ronbunshuu E 69 ( 4 ) 390 - 401 2013

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

There are a few cases that cracks occurred on PC structures at their young ages. It is judged that cracks were caused by large drying shrinkage of concrete. Drying shrinkage strain develops with the loss of moisture. When drying shrinkage is assumed to be constant at any position of cross section, it is impossible to simulate the crack due to drying shrinkage strain. The reason is that internal stress in concrete is developed by the difference of drying shrinkage between inside and outside of concrete. In order to examine the influence of the internal stress, the moisture distribution in concrete is calculated according to the diffusion equation. The analysis in this study targets to the PC bridge in site. As a result, it will be shown that internal stress of the PC bridge can be simulated and that the effect of drying shrinkage on the crack of the PC bridge can be presumed.

File： 69_390.pdf

DOI： 10.2208/jscejmcs.69.390

CiNii Article

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PREDICTION EQUATION OF DRYING SHRINKAGE STRAIN FOR CONCRETE Reviewed

Toshiki AYANO, Takashi FUJII, Yoshihiko TAIRA

Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 69 ( 4 ) 421 - 437 2013

IMPROVEMENT OF RESISTANCE TO SULFURIC ACID ATTACK OF CONCRETE BY USE OF BLAST FURNACE SLAG SAND Reviewed

Paweena JARIYATHITIPONG, Kazuyoshi HOSOTANI, Takashi FUJII, Toshiki AYANO

Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 69 ( 4 ) 337 - 347 2013

Study on Effective Stress Estimation Method for Concrete Members Reviewed

NIITANI Kyoji, WATASE Hiroshi, SAKATA Kenji, AYANO Toshiki

Concrete Research and Technology 20 ( 2 ) 27 - 37 2009.5

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Japan Concrete Institute

Numbers of concrete structures have been constructed and they contribute to creation of infrastructures. It is important to know the stress of concrete acting on existing structures in order to maintain structures appropriately. However, it is difficult to know the actual stress for several reasons. The major reason is differences between the design stress conditions and the actual stress conditions. The causes are internal restrictions due to creep and shrinkage of concrete. In this study, the mechanisms of internal restrictions are investigated through various experiments on creep and shrinkage of concrete, and a new effective stress estimation method is proposed. The method is based on stress release technique. It can separate stresses caused by internal restriction from the total stress. Also, the accuracy of estimated stress has been improved by providing a specified measuring method. From verification tests using test specimens and actual structures, it was confirmed that the method is useful for setting maintenance level of structures.

File： 20_2_27.pdf

DOI： 10.3151/crt.20.2_27

CiNii Article

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Other Link： https://jlc.jst.go.jp/DN/JALC/00332275190?from=CiNii

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