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Mitsui K.,Takenaka Corporation | Yonezawa T.,Takenaka Corporation | Kojima M.,Takenaka Corporation | Kinoshita M.,Takemoto Oil and Fat Co. | Mihashi H.,Tohoku Institute of Technology
Zairyo/Journal of the Society of Materials Science, Japan | Year: 2011

Super high strength concrete with compressive strength of 150 to 200N/mm2 using hybrid fiber reinforcement of organic and steel fiber was developed. Properties of fluidity of fresh concrete and effect of curing condition on strength development were studied. Viscosity of fresh concrete was significantly reduced by newly developed Maleate polycarboxylate-based superplasticizer. Strength development of high strength concrete was enhanced by high temperature steam curing. Hybrid fiber reinforcement was effective to improve toughness and fire resistance of super high strength concrete. The higher the aspect ratio and tensile strength of steel fiber, the higher the toughness of concrete became. Hybrid fiber reinforcement enables to reduce spalling and to maintain fire resistance for 3 hours in super high strength concrete columns. © 2011 The Society of Materials Science, Japan.


Inoue K.,Takenaka Corporation | Iwashimizu T.,Takenaka Corporation | Saito K.,Takemoto Oil and Fat Co. | Mitsui K.,Takenaka Corporation | And 2 more authors.
AIJ Journal of Technology and Design | Year: 2010

A new type admixture was developed for low drying-shrinkage concrete with water-cement ratio of 40-55%. The properties of fresh and hardened concrete using this admixture were studied on the laboratory test and mock-up test. Drying-shrinkage of the low drying-shrinkage concrete using this admixture was 15-20% less than ordinary concrete. Properties of this hardened concrete, as compressive strength, young's modulus, tensile strength, durability and carbonation were determined by this experiment. Effect on reducing cracks by using this admixture were verified in the mock-up test and applications.


Yonezawa T.,Takenaka Corporation | Sakai E.,Tokyo Institute of Technology | Koibuchi K.,D C Corporation | Kinoshita M.,Takemoto Oil and Fat Corporation
fib Symposium 2012: Concrete Structures for Sustainable Community - Proceedings | Year: 2012

A technology for substantial reduction of CO2 foot print of concrete structures was studied. The study resulted in a proposal of a technology named Energy CO2 Minimum (ECM) Cement Concrete System. The system consists of a newly developed high-slag cement (ECM cement) and structures for which the cement with weakness of rapid carbonation can be used. In this paper outline of the study and the performances of the concrete and improved soil for the structures using the cement is presented.


Tanano H.,Japan National Institute for Land and Infrastructure Management | Tanimura M.,Taiheiyo Cement Corporation | Kinoshita M.,Takemoto Oil and Fat Co. | Nawa T.,Hokkaido University
AIJ Journal of Technology and Design | Year: 2012

This report investigates basic properties, such as compressive strength, drying shrinkage and freeze-thaw resistance, of normal strength concrete containing shrinkage reducing agent (SRA) of three brands, by same cement and aggregates as well as water-to-cement ratio (=0.5). SRA-added concretes show that compressive strength tend to lower with the increase in dosage, drying shrinkage strain is obviously reduced (more than approximately 15 %), while freeze-thaw resistance is significantly deteriorated.


Kitatsuji M.,Miyagi University | Aoyama H.,Mirukon Co. | Saito K.,Takemoto Oil and Fat Co. | Endo T.,Tohoku Gakuin University
Concrete under Severe Conditions: Environment and Loading - Proceedings of the 6th International Conference on Concrete under Severe Conditions, CONSEC'10 | Year: 2010

Increased use of fly ash is expected from the standpoint of the effective use of natural resources and measures against alkali-silica reaction. However, it is difficult to adequately control the air content of fly ash concrete, as unburnt carbon contained in fly ash adsorbs the air-entraining admixture, posing a risk of reducing the resistance of concrete to frost damage. In this study, a prefoam-type air-entraining admixture of a whipped cream consistency, which is less prone to the effect of unburnt carbon, was used to entrain fine air bubbles into concrete, in an attempt to enhance its resistance to frost damage. The prefoamtype air-entraining admixture was found to be capable of reducing the spacing factor of fly ash concrete and thus effective against freezing and thawing action. © 2010 Taylor & Francis Group, London.


Katayama S.,Shinshu University | Sugiyama H.,Shinshu University | Kushimoto S.,Shinshu University | Uchiyama Y.,Takemoto Oil and Fat Company | And 2 more authors.
Journal of Agricultural and Food Chemistry | Year: 2016

Alzheimer's disease (AD) is characterized by the progressive accumulation of extracellular β-amyloid (Aβ) aggregates. Recently, the senescence-accelerated mouse-prone 8 (SAMP8) model was highlighted as a useful model of age-related AD. Therefore, we used the SAMP8 mouse to investigate the preventive effects of sesame lignans on the onset of AD-like pathology. In preliminary in vitro studies, sesaminol showed the greatest inhibitory effect on Aβ oligomerization and fibril formation relative to sesamin, sesamolin, and sesaminol triglucoside. Hence, sesaminol was selected for further evaluation in vivo. In SAMP8 mice, feed-through sesaminol (0.05%, w/w, in standard chow) administered over a 16 week period reduced brain Aβ accumulation and decreased serum 8-hydroxydeoxyguanosine, an indicator of oxidative stress. Furthermore, sesaminol administration increased the gene and protein expression of ADAM10, which is a protease centrally involved in the non-amyloidogenic processing of amyloid precursor protein. Taken together, these data suggest that long-term consumption of sesaminol may inhibit the accumulation of pathogenic Aβ in the brain. © 2016 American Chemical Society.


Tamaki S.,Takemoto Oil and Fat Co. | Saito K.,Takemoto Oil and Fat Co. | Okada K.,Takemoto Oil and Fat Co. | Atarashi D.,Tokyo Institute of Technology | Sakai E.,Tokyo Institute of Technology
American Concrete Institute, ACI Special Publication | Year: 2015

Several studies have been pursued in Japan on developing concrete using high volume blast-furnace slag cement for reducing CO2 emissions arising from calcination of cement. However, when using high volume blast-furnace slag cement, various problems are encountered, such as decreased fluidity retention ability caused by the reduction of admixture dosage and decreased strength enhancement. In this paper, the authors focus on the adsorption properties of polycarboxylate ether superplasticizers and the properties of hardened concrete that incorporates a component of high volume blast-furnace slag cement, and discuss the development of a new type of superplasticizer through molecular design and optimization of the admixture composition. The admixture improved the fluidity and properties of hardened concrete using slag cement containing more than 60% blastfurnace slag.


Hachiya I.,Mie University | Matsumoto T.,Mie University | Inagaki T.,Mie University | Takahashi A.,Mie University | And 2 more authors.
Heterocycles | Year: 2010

3,4-Ethylenedioxythiophene (EDOT) was synthesized from commercially available (Z)-but-2-ene-1,4-diol or but-2-yne-1,4-diol using epoxidation, etherification, and thiophene formation. © The Japan Institute of Heterocyclic Chemistry.


Hachiya I.,Mie University | Yamamoto T.,Mie University | Inagaki T.,Mie University | Matsumoto T.,Mie University | And 4 more authors.
Heterocycles | Year: 2014

3,4-Ethylenedioxythiophene (EDOT) was synthesized from commercially available 2,3-butanedione in only a two-step procedure including ketalization and thiophene formation. © 2014 The Japan Institute of Heterocyclic Chemistry.


Saito K.,Takemoto oil and Fat Co. | Kinoshita M.,Takemoto oil and Fat Co. | Umehara H.,Nagoya Institute of Technology | Yoshida R.,Nagoya Institute of Technology
RILEM Bookseries | Year: 2010

It is indicated that the risk of early age shrinkage cracking on high- strength self-compacting concrete (SCC) increases due to autogenous shrinkage caused by low water-to-cement ratio (w/c) and high cement content. For the purpose of reducing the shrinkage strain of high-strength SCC, three kinds of shrinkage-reducing concrete materials, shrinkage-reducing admixture (SRA), blast furnace slag aggregate (BFS) and limestone aggregates were examined. It was found that these materials each showed excellent shrinkage-reducing effect better than each ordinary material when they were used separately. In addition, the authors have found that the shrinkage-reducing mechanisms were individually different and the shrinkage-reducing effect was approximately 45% to 61% when used all together. © RILEM 2010.

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