Kyushu University Academic Staff Educational and Research Activities Database
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Yasutaka SAGAWA Last modified date:2020.09.14

Associate Professor / Civil design and materials
Faculty of Engineering

Graduate School
Undergraduate School

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Concrete Laboratory of Kyushu University .
Civil Engineering Program, School of Engineering, Kyushu University .
Promotion Institute for Everyone on Civil Engineering .
Academic Degree
Doctor of Engineering
Field of Specialization
Construction Materials, Concrete Engineering
Outline Activities

1. Recycling of industrial waste for materials of concrete
2. Reduction of cracks of lining concrete
2. Estimation of concrete structures by microstructure
3. Utilization of precast concrete members

1. Design of Reinforced Concrete

2. Civil and Environmental Engineering Laboratory 1
(1) Concrete Mixing

3. Civil and Environmental Engineering Laboratory 3
(1) Nondestructive testing of concrete
Research Interests
  • Maintenance of road structures in local government
    keyword : road structure, bridge, pavement, maintenance, local government
  • Geopolymer
    keyword : Geopolymer, Fly ash
  • Acceleration method for prevention of ASR in concrete structures
    keyword : Alkali Silica Reaction, ASR, Prevention, Reactive aggregate, Concrete prism, Alkali
  • Application geopolymer for construction material
    keyword : Geopolymer, Fly ash
  • Thermal Cracking of Concrete Structures
    keyword : Thermal Cracking
  • Utilization of unused slag by-products for concrete aggregate
    keyword : Unused slag, by-products, aggregate
  • Durability of the end of girder bridge
    keyword : Concrete bridge, Salt damage, The end of girder, Deicing salt
  • Development of Large-scale Precast Concrete Skew Box Culvert with Looped Joint Connection
    keyword : Precast concrete, Looped joint connection, Skew, Half precast construction method, Box culvert, Segment
  • Strength and durability of concrete with recycled aggregate
    keyword : Recycle, Waste, Recycled aggregate, Recycled concrete, Durability, Adhered mortar
    2001.04~2017.03A study on strength and durability of concrete used recylced aggregate.
  • Chloride Ion Permeability of High-Strength Concrete Mixed with Ground Granulated Blast-Furnace Slag
    keyword : Ground Granulated Blast-Furnace Slag, Slat Damage, Chloride Ion Permeability, Diffusion Coefficient, Electrical Conductivity Test
  • Behavior Analysis of Concrete under Loading and Deteriorating by Digital Image Correlation Method
    keyword : Digital Image Correlation Method (DICM), Strain, Deterioration, Maintenance
  • Effective use of blast-furnace slag and fly ash for concrete material
    keyword : Blast-furnace slag fine aggregate, fly ash
Academic Activities
1. Tamon UEDA, et al., 土木学会コンクリート標準示方書[施工編]英文版 Standard Specifications for Concrete Structures -2007- "Materials and Construction"(分担執筆), 土木学会, JSCE Guidelines No.16, December, 2010, 2011.06.
1. Performance Base Design and Maintenance Scenario with ASR Control.
1. Dasar, A., Patah, D., Hamada, H., Sagawa, Y., Yamamoto, D., Applicability of seawater as a mixing and curing agent in 4-year-old, Construction and Building Materials, 10.1016/j.conbuildmat.2020.119692, 259, Article number 119692, 2020.10.
2. Yuichiro Kawabata, Kazuo Yamada, Go Igarashi, Yasutaka Sagawa, Effects of Soak Solution Type on Alkali Release from Volcanic Aggre-gates − Is Alkali Release Really Responsible for Accelerating ASR Expansion? −, Journal of Advanced Concrete Technology,, 16, 9, 61-74, 2018.01.
3. Amry Dasar, Hidenori Hamada, Yasutaka Sagawa, Daisuke Yamamoto, Deterioration progress and performance reduction of 40-year-old reinforced concrete beams in natural corrosion environments, Construction and Building Materials, 10.1016/j.conbuildmat.2017.05.162, 149, 690-704, 2017.09, Deterioration progress and performance reduction were experimentally evaluated in 40-year-old corroded reinforced concrete (RC) beams. The corrosion process was natural, without acceleration by current application, admixture inclusion, or exposure to an artificial chloride environment. The mechanical performance of the beams was evaluated through a four-point bending test. The corroded steel reinforcing bars were extracted for corrosion evaluation and tensile testing. A good correlation was established between crack width and cross-section loss, as well as between cross-section loss and ultimate capacity loss. Furthermore, the relationship between deterioration progress and performance degradation with the exposure period for each deterioration stage was elucidated..
4. Yasutaka SAGAWA, Kazuo YAMADA, Shoichi OGAWA, Yuichiro KAWABATA, Masahiro OSAKO, The Effect on Expansion of Wrapping Concrete Prisms with Cloth Saturated with Alkali Hydroxide, Proceeding of 27th Biennial National Conference of the Concrete Institute of Australia in conjunction with the 69th RILEM Week, 822-831, 2015.08.
5. Yasutaka SAGAWA, Shu OTA, Koji HARADA, Takeyoshi NISHIZAKI, Hiroki GODA, Utilization of Fly Ash with Higher Loss on Ignition for Geopolymer Mortar, Advanced Materials Research, 10.4028/, 1129, 614-620, 2015.08.
6. Kazuo Yamada, Shinya Karasuda, Shoichi Ogawa, Yasutaka Sagawa, Masahiro Osako, Hidenori Hamada, Mohd Isneini, CPT as an evaluation method of concrete mixture for ASR expansion, Construction and Building Materials, 10.1016/j.conbuildmat.2014.04.034, 64, 184-191, 2014.08, Highly reactive andesite aggregates including opal or tridymite were evaluated by concrete prism test (CPT) in two ways and the suitable conditions of CPT were discussed. 18 concrete mixtures were used to examine the effect of the type and content of aggregate, the type of cementitious material. Two methods for detecting for ASR reactivity were used; RILEM AAR-4 and JASS 5N, and the latter one is of which authors revised few points. As the results, different performances of andesite depending on the size and the different required amounts of fly ash suppressing ASR depending on the mixture proportion were well demonstrated by CPT that is difficult for mortar bar test. As a curing method to avoid alkali leaching, wrapping with wet paper showed much less leaching than curing in a sealed box. From the viewpoint of easiness of operation, small size 75 × 75 × 250 mm is suitable than large size 100 × 100 × 400 mm..
Membership in Academic Society
  • Japan Society of Civil Engineers
  • Japan Concrete Institute
  • Japan Prestressed Concrete Engineering Association
  • Kyushu Association for Bridge and Structural Engineering
Educational Activities
1. Mechanics and Design of Reinforced Concrete (Undergraduate)

2. Civil and Environmental Laboratory (Undergraduate)

3. Advanced Concrete Technology (Graduate)

4. Highway Engineering (Graduate)

5. Presentation Exercise (Graduate)
Other Educational Activities
  • 2014.03.
  • 2011.01.