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Start Over Author "Hiroshi Jinnai" Journal journal of structural and construction engineering (transactions of aij)
40 results on '"Hiroshi Jinnai"'

7. FUNDAMENTAL STUDY ON MORTAR USING RECOVERED FINE AGGREGATE

Author

Hiroshi Jinnai, Sumie Suzuki, Yoshihiro Masuda, Tadatsugu Kage, and Hiroyuki Tanano

Subjects
Fundamental study, Compressive strength, Aggregate (composite), Materials science, Architecture, Particle-size distribution, Building and Construction, Composite material, Mortar
Published
2019
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12. QUANTITATIVE STUDY ON CARBONATION PROGRESS OF CONCRETE USING FLY ASH

Author

Takumi Zaitsu, Hisashi Sugiyama, Toshimitsu Kobayashi, and Hiroshi Jinnai

Subjects
010302 applied physics, Materials science, Waste management, Carbonation, 02 engineering and technology, Building and Construction, 021001 nanoscience & nanotechnology, 01 natural sciences, Compressive strength, Fly ash, 0103 physical sciences, Architecture, Pozzolanic reaction, 0210 nano-technology
Published
2016
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15. THE EVALUATION OF DEGRADATION OF EXTERIOR FINISHES AND ITS RELATION TO CONCRETE CARBONATION PROGRESS WITH COMBINATION OF MARKOV CHAIN MODEL AND IN-SITU NON-DESTRUCTIVE AIR PERMEABILITY TEST FOR CONCRETE COVER

Author

Hiroshi Jinnai, Akiyuki Shimizu, Kei Matsuda, and Keiichi Imamoto

Subjects
In situ, Materials science, Markov chain, business.industry, Carbonation, Building and Construction, Air permeability specific surface, Nondestructive testing, Non destructive, Architecture, Degradation (geology), Geotechnical engineering, Composite material, business, Concrete cover
Published
2013
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20. BASIC STUDY ON ENVIRONMENTALLY FRIENDLY ULTRA HIGH STRENGTH CONCRETE

Author

Yutaka Yoshida, Hiroshi Jinnai, and Keiki Yamamoto

Subjects
Compressive strength, Materials science, Architecture, Building and Construction, Composite material, Mortar, Environmentally friendly, High strength concrete
Abstract

The spreading awareness of green issues in recent years has prompted us to develop environmentally friendly concrete: ultra high strength concrete that contains high volume of by-products. Compressive strength tests were conducted using mortar and concrete specimens containing various by-products. As a result, we suggested a computation approach of the compressive strength of mortar by using a regression expression that uses the chemical composition and the mixing condition of the by-product as parameters. And CO2 emissions from the component materials of this environmentally friendly, ultra high strength concrete reduce 40% of the emissions for conventional ultra high strength concrete.

Published
2012
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23. MEASURING METHOD OF PREMATURE STIFFENING ZONE FORMED AT THE TOP SURFACE AFTER HIGH-STRENGTH MORTAR PLACING

Author

Satoru Namiki, Keiki Yamamoto, Rieko Terauchi, Hiroshi Jinnai, and Masato Iijima

Subjects
Materials science, Architecture, cardiovascular system, Building and Construction, Penetration (firestop), Mortar, Composite material, musculoskeletal system, Resistivity distribution, circulatory and respiratory physiology, Stiffening
Abstract

This paper discusses a measuring method of the premature stiffening zone formed at the top surface after placing of high-strength mortar with a water-binder ratio below 0.2. In this experiment, first a measuring method of the premature stiffening zone was devised by using penetration resistance measurements. The penetration resistance distribution, resistivity distribution and moisture content measurements of mortar specimens simulated high-strength concrete with a design strength of approximately 150N/mm2 were then conducted to assess the appropriateness of the measuring method of the premature stiffening zone.The results reveal that the measuring method was applicable to determining the occurrence and approximate depth of premature stiffening zone for high-strength mortar.

Published
2008
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24. BASIC STUDY ON TEST AGE AND CURING METHOD OF SPECIMEN FOR MANUFACTURING CONTROL OF HIGH STRENGTH CONCRETE

Author

Rieko Terauchi, Satoshi Watanabe, Hiroshi Jinnai, and Mitsutaka Hayakawa

Subjects
Portland cement, Materials science, law, Architecture, Building and Construction, Composite material, Curing (chemistry), law.invention, High strength concrete
Abstract

Test age and curing method of specimen for manufacturing control of high strength concrete were investigated and following results were obtained. 1) The strength correction value of high strength concrete is small in the order of Ordinary portland cement > Moderate heat portland cement > Low heat portland cement. Moreover, it was necessary to set test age of high strength concrete using Moderate heat portland cement and Low heat portland cement on the day after the 28th. 2) In the case to use portland cement, if strength test is set within 91 days, the strength correction value doesn't reach a big negative value. 3) In the case of binder water ratio is six to seven, even if strength test is set within 91 days, the strength correction value reaches a big negative value. 4) Also in the case with 3), reasonable manufacturing control can be done by the hot water cured specimen.

Published
2008
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