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79 results on '"Hisada, Makoto"'

9. Compressive strength and chloride ion permeation resistance of mortar containing clinker with different mineral composition as an aggregate

Author

Ishikawara, Kotaro (author), Miyamoto, Shintaro (author), Hayashi, Kensuke (author), Minagawa, Hiroshi (author), Hisada, Makoto (author), Ishikawara, Kotaro (author), Miyamoto, Shintaro (author), Hayashi, Kensuke (author), Minagawa, Hiroshi (author), and Hisada, Makoto (author)

Abstract

The purpose of this study is to clarify the performance of cement hardenings containing clinkers which are utilized as aggregate by evaluating the compressive strength and chloride ion penetration resistance of the mortars. Here, the fine aggregate used in this study were the ordinary Portland cement clinker and the clinker with more waste as an alternative raw material. In addition to this, we discussed on the effect of the clinkers on the compressive strength and chloride ion penetration resistance of mortar based on the weight loss on ignition and void structure. The results showed that the compressive strength of the mortars containing clinker aggregate was equal to or more than the mortar used an ISO standard sand, and the apparent diffusion coefficient of chloride ion decreased by using clinker. The reason why improving compressive strength and chloride ion penetration resistance might be attributed to the densification of the voids in the range of 50 nm to 2 μm, which is considered to be the void diameter represented by the interfacial transition zone, by hydration of clinker itself.

Published
2021

10. Deterioration rate of hardened cement caused by high concentrated mixed acid attack

Author

Miyamoto, Shintaro, Minagawa, Hiroshi, and Hisada, Makoto

Subjects
Mole (Chemistry) -- Analysis, Hydrochloric acid -- Research -- Usage, Nitric acid -- Research -- Usage, Chemical reaction, Rate of -- Research, Cement -- Chemical properties -- Research, Business, Construction and materials industries
Abstract

ABSTRACT The purposes of this study are to clarify the deterioration mechanism of hardened cement caused by high concentrated acid attack. As the result, In the case of high concentrated [...]

Published
2014
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12. Performance of high strength concrete made with copper slag as a fine aggregate

Author

Jabri, Khalifa Al- S., Hisada, Makoto, Saidy, Abdullah Al- H., and Oraimi, S.K. Al-

Subjects
Cement industry -- Mechanical properties, Medical research -- Mechanical properties, Medicine, Experimental -- Mechanical properties, Aluminum compounds -- Mechanical properties, Green design -- Mechanical properties, Building materials -- Mechanical properties, Business, Construction and materials industries, Mechanical properties
Abstract

ABSTRACT This research study was conducted to investigate the performance of high strength concrete (HSC) made with copper slag as a fine aggregate at constant workability and to study the [...]

Published
2009
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18. EFFECT OF CRACK WIDTH AND BAR TYPES ON CORROSION OF STEEL IN CONCRETE

Author

Mohammed, Tarek Uddin, Otsuki, Nobuaki, Hisada, Makoto, and Shibata, Tsunenori

Subjects
Concrete -- Cracking, Steel bars -- Testing, Steel -- Corrosion, Engineering and manufacturing industries, Science and technology
Abstract

A study on the influence of crack widths and type of bars (plain and deformed) on corrosion of steel bars in cracked concrete is presented here. Microcell and macrocell corrosions of plain and deformed steel bars were investigated on 10 X 10 X 40 cm single crack specimens with crack widths of 0.1, 0.3, and 0.7 mm. Water-to-cement ratios were 0.3, 0.5, and 0.7. Electrochemical investigations were also conducted on 15 X 15 X 125 cm multicrack specimens with plain and deformed bars. For these specimens, water-to-cement ratios were 0.5 and 0.7 and crack widths were varied from 0.1 to 0.4 mm. After electrochemical investigations, chloride ions in concrete, corroded areas, weight losses, and pit diameters of the steel bars were investigated. The entire study was carried out in an artificially created chloride ion-induced corrosion environment. The study concludes that the relationship between crack widths and corrosion rate is observed at the very early age of exposure. Water-to-cement ratio and corrosion rate relationship is clearer than crack widths and corrosion rate relationship. Deformed bars are more prone to corrosion than plain bars.

Published
2001

46. fib Bulletin 28. Environmental design

Author

Sakai, Koji, primary, Ajdukiewicz, Andrzej B., additional, Desmyter, Jan, additional, Hájek, Petr, additional, Hisada, Makoto, additional, lchikawa, Makihiko, additional, Kawai, Kenji, additional, Kawano, Hirotaka, additional, Mizuguchi, Hiroyuki, additional, Noguchi, Takafumi, additional, Schmidt, Michael, additional, Schneider, Martin, additional, Sommer, Peter, additional, Stepánek, Petr, additional, and Tamura, Masaki, additional

Published
2004
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