Research Achievements - Original paper -

THE EFFECT OF THE THERMAL STIMULATION OF SUPERPLASTICIZER ON THE FRESH PROPERTIES OF FLY ASH-BLENDED MORTAR

TAKIGAWA Mizuki, Kenneth G.C.A. Kakpo, TOKUSHIGE Hidenobu, DATE Shigeyuki

Cement Science and Concrete Technology ( Japan Cement Association )  79 ( 1 ) 131 - 138   2026.03  [Refereed]

Research paper (journal)  

<p>Previous research has confirmed that heating superplasticizer (hereafter referred to as “thermal stimulation")changes the apparent size of the polymers in the superplasticizer, increasing workability. However, there have been no studies on using fly ash as part of the binders. This study investigated the effects of thermal stimulation on the fresh and harden properties of mortar mixed with fly ash. The results showed that there was a slight improvement in flowability and plastic viscosity and that the load during mixing was decrease. However, as the material age increased, its compressive strength decreased, indicating the need for a more detailed examination of its harden properties.</p>

DOI CiNii Research

Fundamental Mechanical Properties of Mortar Incorporating Rice Husk Ash as Pavement Material

Kakpo K.G.C.A., B. BURGOS Isaac Qairo, TOKUSHIGE Hidenobu, TAKIGAWA Mizuki

Zairyo Journal of the Society of Materials Science Japan ( Zairyo Journal of the Society of Materials Science Japan )  74 ( 5 ) 308 - 315   2025.05  [Refereed]

Research paper (journal)   Domestic Co-author

<p>In the quest for sustainable solutions to environmental challenges, the exploration of alternative materials derived from by-products has gained considerable momentum. In the engineering industry, rice husk ash (RHA) stands out as a promising candidate to replace cement. It is an amorphous powder rich in silica that possesses pozzolanic properties similar to ordinary cement. Therefore, using RHA in concrete not only promises a means of waste management, but it also can potentially increase the performance of concrete. This study investigated the mechanical properties of specimens of mortar incorporating RHA as a partial replacement for cement. To properly assess the suitability of RHA for use in pavement, the hardness and slip resistance of specimens were also tested. The results showed that the particle size and loss on ignition of the RHA significantly influences the workability of mortar incorporating RHA. Some of the hardened specimens could achieve higher strength than the control specimen. However, increasing the RHA content from 10 to 20% led to a significant decrease in the strength and slip resistance of the specimens. Nevertheless, all RHA types used in the study developed sufficient flexural strength, satisfactory slip resistance and excellent hardness values, which makes them potentially safe and comfortable, both as road and pedestrian pavements. Finally, our analysis of the CO₂ emissions during production demonstrated that the use of RHA is less damaging to the environment than is cement.</p>

DOI CiNii Research

Study on Anchor Properties of Mechanical Anchor using Nut on Reinforcing Bar End

Yoshimatsu Hidekazu, Mito Kensuke, Takahashi Ryosuke, Tokushige Hidenobu

Concrete Research and Technology ( Japan Concrete Institute )  34 ( 0 ) 117 - 127   2023.11  [Refereed]

Research paper (journal)   Domestic Co-author

<p>The purpose of this study is the development of an RC joint structure for connecting precast PC slabs used for replacement of the deteriorated RC slabs of a steel girder bridge, wherein the anchor length of the reinforcing bar in the bridge span direction is shortened by using mechanical anchorage with a nut at an end of the bar. The applicability of that joint to actual bridge structures has already been confirmed by the moving wheel loading test. In this paper, the pull-out test is conducted on reinforcing bars with nuts at their ends to clarify the anchor properties, and the applicability of the existing bond-slip-strain relationship considering the behavior of the nut and the reduction of the effect of strain of reinforcing bar is confirmed.</p>

DOI Repository CiNii Research

Melt Adhesion Test between Carbon Fiber Sheet and Cement Mortar Using Thermoplastic Epoxy Resin with Controlled Molecular Weight

YAMASHITA Tsuyoshi, JIKEI Mitsutosi, TOKUSHIGE Hidenobu, MURAOKA Mikio

Journal of the Society of Materials Science, Japan ( The Society of Materials Science, Japan )  72 ( 4 ) 347 - 351   2023.04  [Refereed]

Research paper (journal)   Domestic Co-author

DOI CiNii Research

Examination of Adhesion Characteristics of Rebar Joints attached Nuts

  43 ( 2 ) 367 - 372   2021.07  [Refereed]

Research paper (journal)   Domestic Co-author

Utilisation of Titanium and Titanium Dioxide as Scaffolds for Proliferating Coral Reef

Masato Ueda, Chihiro Sawatari, Tomoyuki Takahashi, Hiroaki Tsuruta, Hidenobu Tokushige, Hirohisa Hikosaka, Daigo Yonetsu and Masahiko Ikeda

Materials Science Forum   ( 1016 ) 1497 - 1502   2021.01  [Refereed]

Research paper (journal)   Domestic Co-author

DOI

A STUDY ON EVALUATION OF CONCRETE SURFACE DETERIORATION DUE TO FREEZING AND THAWING ACTION BY USING ARITHMETICAL MEAN DEVIATION

SAITO Noritoshi, TOKUSHIGE Hidenobu

Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) ( Japan Society of Civil Engineers )  74 ( 1 ) 53 - 65   2018.02  [Refereed]

Research paper (journal)   Domestic Co-author

DOI CiNii Research

Effective Application of Natural Resources Environmental-Conscious Construction Materials and Systems

Makoto Kawakami and Hidenobu Tokushige

RILEM TC 192-ECM, RILEM Report   37   5 - 10   2007.01  [Refereed]

Research paper (journal)   Domestic Co-author

Effect of Particle Size of Aggregate on Physical Properties of Lightweight Porous Polymer Concrete

Hidenobu Tokushige, Makoto Kawakami and Satoru Matsuoka

Transactions of JCI   23   83 - 90   2002.01  [Refereed]

Research paper (journal)   Domestic Co-author

Physical Properties of Ultra-lightweight Polymer Concrete

Hidenobu Tokushige. Makoto Kawakami and Takahisa Okamoto

Transactions of JCI   23   91 - 96   2002.01  [Refereed]

Research paper (journal)   Domestic Co-author

Stress and Deformation of Concrete Members Repaired by Polymer Mortar

Hidenobu Tokushige， Makoto Kawakami， Hideki Todate and Kazunori Doiuchi

Transactions of JCI   21   89 - 94   2000.01  [Refereed]

Research paper (journal)   Domestic Co-author

振動締固め方式による透水性コンクリートの配合設計法に関する研究

徳重英信，佐伯　昇，川上　洵

土木学会論文集   627   1 - 11   1999.08  [Refereed]

Research paper (journal)   Domestic Co-author

Study on the Setting Shrinkage of Polymer Mortar

Hidenobu Tokushige, Fujio Omata, Makoto Kawakami and Makoto Kagaya

Transactions of JCI   19   49 - 56   1998.01  [Refereed]

Research paper (journal)   Domestic Co-author

Setting Shrinkage and Setting Stress of Polymer Mortar

Fujio Omata, Makoto Kawakami, Hidenobu Tokushige and Akihiro Moriyoshi

ACI SP   171   307 - 624   1997.06  [Refereed]

Research paper (journal)   Domestic Co-author