Search Results 1-20 of 1162

  • Influence of Microstructure on Fatigue Fracture Characteristics of Al2O3

    Kido Mitsuo , Katayama Gounozyo , Inoda Nana , Tsuchibushi Yasuyuki

    … The measurements of R-curve behavior and COD under cyclic loading showed that the grain bridging effect of Material SC was reduced further than that of Material SC-f. … Consequently, it is concluded that the degradation of fatigue strength in Material SC under cyclic loading in water was caused by the activation of a hydration reaction at grain boundaries in the crack tip and a marked decrease in the grain bridging effect (i.e., an increase in Ktip). …

    広島工業大学研究紀要 (33), 67-74, 36192-00-00

    IR 

  • EFFECT OF AUTOGENOUS SHRINKAGE STRAIN ON THERMAL STRESS OF CONCRETE GRAVITY DAMS IN CONSTRUCTION STAGE  [in Japanese]

    SATOH Hideaki , MIYAZAWA Shingo

    <p> コンクリートダムでは,セメントの水和熱に起因して発生する温度応力の制御が重要な課題であり,古くから種々の研究が行われてきた.とりわけ,近年の解析手法の発展により,設計・施工段階における温度応力については,詳細な検討が行えるまでになった.一方,単位結合材量の少ないダムコンクリートにおいても,セメントの種類によっては一般のマスコンクリートと同様に無視できない自己収縮ひずみが生じるこ …

    Journal of Japan Society of Civil Engineers, Ser. E2 (Materials and Concrete Structures) 76(2), 130-143, 2020

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  • Suppressive Effects on Copper Electrodeposition, Induced by Adsorption of Polyethylene Glycol and Pluronic Surfactants  [in Japanese]

    FUKUI Takahiro , TARUTANI Yoshie , KUBOTA Kenji , AKAMATSU Masaaki , SAKAI Kenichi , SAKAI Hideki

    … <p>We studied the adsorption of polyethylene glycol (PEG) and amphiphilic polyoxyethylene-polyoxypropylene-polyoxyethylene (PEO-PPO-PEO) triblock copolymers (Pluronic surfactants) on a model metal substrate(gold)and assessed their suppressive effect on copper electrodeposition. … The electrodeposition-suppressive effect was assessed using linear sweep voltammetry (LSV). …

    Journal of The Surface Finishing Society of Japan 71(5), 356-362, 2020

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  • A novel vest with dual functions for firefighters: combined effects of body cooling and cold fluid ingestion on the alleviation of heat strain

    KIM Do-Hyung , BAE Gyu-Tae , LEE Joo-Young

    … In summary, the combined effect of skin cooling and fluid ingestion was synergistically manifested in <i>T</i><sub>re</sub>, <i>T</i><sub>sk</sub> …

    Industrial Health 58(2), 91-106, 2020

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  • TAFRO Syndrome Presenting with Retroperitoneal Panniculitis-like Computed Tomography Findings at Disease Onset

    Yanagiya Ryo , Ishizawa Kenichi , Saito Soichi , Suzuki Takuma , Nakamura Shuhei , Fujita Kotaro , Oyama Midori , Okuyama Ayumi , Sugasawa Kunie , Nakayama Takahiro , Suzuki Yoshihiro

    … He was treated initially with a protease inhibitor and hydration, to little effect. …

    Internal Medicine 59(7), 997-1000, 2020

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  • Dehydration and Hydration Reactivity of Citrate-Added Mg(OH)<sub>2</sub> for Thermo-chemical Energy Storage  [in Japanese]

    Saitou Kouki , Kurosawa Ryo , Ryu Junichi

    … <p>This research focuses on dehydration / hydration of magnesium hydroxide as a chemical heat storage material. … Previous studies have reported that the use of additives in magnesium hydroxide improved the dehydration / hydration reactivity. … The effect of the additive was verified by measuring the dehydration / hydration reaction of magnesium hydroxide using a thermogravimetric instrument. …

    Tetsu-to-Hagane, 2020

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  • HYDRATION OF FLY ASH CEMENT CONTAINING HIGH ALITE CEMENT AND LIME STONE POWDER  [in Japanese]

    SAKAI Etsuo , UMETSU Mamiko , NITO Nobukazu , KUGA Ryuichiro

    <p>エーライト含有量や遊離石灰量を高めた基材セメントを用い、石灰石微粉末(LSP)を少量添加し、普通ポルトランドセメント(N)と同等のモルタル強さを発現するフライアッシュ(FA)の置換率を18%としたフライアッシュセメント(AFC)の水和反応と水和物について、Nと通常のFAセメント(NF)と比較して検討した。FAの反応は長期に継続し、NFではモノサルフェートが生成するがAFCではAF …

    Cement Science and Concrete Technology 73(1), 26-31, 2020

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  • EFFECT OF Al AND Mg ON FORMATION AND CRYSTAL OF TOBERMORITE  [in Japanese]

    MITSUMORI Yosuke , SAITO Tsuyoshi , KATO Fukumasa , SAEKI Tatsuhiko

    <p>本研究ではAlやMgがトバモライトの生成や結晶構造に及ぼす影響を検討するため、出発Ca源及びSi源にAl系添加物であるゲーレナイト、Mg系添加物のオケルマナイト、またそれらの固溶体を添加し高温高圧条件でオートクレーブ(以下AC)養生、80℃で水和養生を施した。その結果、高温高圧養生下ではAl系物質を添加した試料に関して、Al置換型1.1nmトバモライトの生成が確認された。またゲー …

    Cement Science and Concrete Technology 73(1), 2-9, 2020

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  • EFFECT OF RELATIVE HUMIDITY ON CARBONATION SHRINKAGE AND HYDRATION PRODUCT OF CEMENT PASTE  [in Japanese]

    SUDA Yuya , TOMIYAMA Jun , SAITO Tsuyoshi , SAEKI Tatsuhiko

    <p>本研究は、セメント硬化体の炭酸化に及ぼす相対湿度の影響を評価する目的で、20℃環境下のもと相対湿度11%、43%、66%、85%における炭酸化による収縮挙動と組織構造の変化に着目し検討を行った。その結果、乾燥時の相対湿度の違いにより炭酸化収縮の進行程度は異なり、相対湿度43%において収縮量が最も大きくなった。一方で炭酸化による水酸化カルシウムの残存量は相対湿度66%が最も少なく、 …

    Cement Science and Concrete Technology 73(1), 71-78, 2020

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  • EFFECT OF ALKANOLAMINE ON EARLY HYDRATION REACTION OF FLY ASH CEMENT  [in Japanese]

    SONG Hyeonjin , ATARASHI Daiki , HOSOKAWA Yoshifumi , MIYAKAWA Miho

    <p>初期強度を改善したFAセメントの材料設計のため、初期強度増進剤として3種類のアルカノールアミンがFAセメントの初期水和反応に及ぼす影響を検討した。全てのアルカノールアミンを添加したFAセメントで強熱減量及び水和発熱量は増加した。クリンカー鉱物中のC<sub>4</sub>AFの反応率が大きく増加し、C<sub>3</sub>S及びF …

    Cement Science and Concrete Technology 73(1), 59-64, 2020

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  • INFLUENCE OF Ca(NO<sub>2</sub>)<sub>2</sub> AND DIETHNOL-ISOPROPANOLAMINE ON THE HYDRATION OF HIGH VOLUME BLAST FURNACE SLAG CEMENT  [in Japanese]

    SAKAI Etsuo , UEDA Yukiko , AIKAWA Yutaka , NITO Nobukazu

    <p>高炉スラグ高含有セメント(HVBFSC)の水和反応や圧縮強さに及ぼすジエタノールイソプロパノールアミン(DEIPA)の影響や亜硝酸カルシウムとの併用効果について検討した。両者を併用した場合には、材齢7日と28日ではHVBFSC中のエーライトの反応率は無添加とほぼ同等かわずかに小さいが、HVBFSC中のBFSの反応率は無添加より大きな値を示した。無添加より圧縮強さが大きいのは、この …

    Cement Science and Concrete Technology 73(1), 52-58, 2020

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  • EFFECT OF CALCIUM NITRITE ON HYDRATION REACTION OF BLAST FURNACE SLAG  [in Japanese]

    OSAKI Shuya , ATARASHI Daiki , SONG Hyeonjin , SUDOH Yuhji

    <p>高炉スラグの水和反応に及ぼす亜硝酸カルシウムの影響について検討するために、Ca(OH)<sub>2</sub>─高炉スラグペーストを作製し、石こう添加の影響と比較した。併せて高炉セメントの水和反応に及ぼす亜硝酸カルシウムの影響も検討した。石こう添加では材齢14日目以降反応は停滞し、主要な水和生成物としてはAFtが確認された。これに対して、亜硝酸カルシウム添 …

    Cement Science and Concrete Technology 73(1), 44-51, 2020

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  • INVESTIGATION OF THE STRUCTURE OF Mg AND ALKALI-ADDED 1.4nm TOBERMORITE DRIED UNDER VARIOUS CONDITIONS  [in Japanese]

    KATO Fukumasa , SAITO Tsuyoshi , MATSUI Kunio , SAEKI Tatsuhiko

    <p>本研究ではMgやアルカリを添加して合成した1.4nmトバモライトの構造変化に着目し、乾燥条件が与える影響について検討するために80℃の水和反応後にRH=11~88%で長期乾燥した試料の分析を行った。その結果、高RH条件下で不安定であった1.4nmトバモライトの構造がRH=11%においては安定化し、結晶性の向上が示された。また各条件で乾燥した試料に共通して1.4nmトバモライトは前 …

    Cement Science and Concrete Technology 73(1), 10-17, 2020

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  • Link of Self-Compacting Fiber Concrete Behaviors to Composite Binders and Superplasticizer

    Fediuk Roman , Mosaberpanah Mohammad , Lesovik Valery , Baranov Andrey

    … Replacement of cement by waste composite binders as a supplementary cementitious material has a positive effect on mechanical properties of FRSCC from 30% to around 35% of cement replacement. … Increasing the waste composite binders decreased the vapor permeability and effective diffusion coefficient of FRSCC by improving the hydration rate and decreasing the pores of the concrete matrix. …

    Journal of Advanced Concrete Technology 18(3), 67-82, 2020

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  • Experimental-Computational Investigation of Elastic Modulus of Ultra-High-Rise Pumping Concrete

    Li Yue , Hao Ji , Wang Zigeng , Guan Zhongzheng , Wang Rui , Chen Heng , Jin Caiyun

    … Firstly, the back scattered electron (BSE) image binarization method was used to study the effect of pumping on the composition and pore distribution of the concrete. … The results showed that the porosity of the paste after the ultra-high-rise pumping decreased by 7.27%, the hydration degree of the cement increased by 6.51%, and the elastic modulus of the paste increased by 3.1 GPa. …

    Journal of Advanced Concrete Technology 18(2), 39-53, 2020

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  • Effect of Physical and Chemical Characteristics on Mechanical Property of Improved Soils until 6 Months  [in Japanese]

    MIYASHITA Yukika , OTA Takashi , SANJEEWANI Dayani , YAMAZAKI Shusaku , NEGISHI Atsunori

    … <p>In this study, the effect of physical and chemical properties on the long term mechanical property of surplus soils improved by lime and cement was investigated by conducting unconfined compression and needle penetration tests on the specimens cured under different conditions. … As the result of the experiments after about 6 months (168 days) from specimen preparation, effect of soaking on the strengths appeared obviously in the cement treated soil. …

    Journal of the Society of Materials Science, Japan 69(1), 35-40, 2020

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  • Effects of Water Addition on a Catalytic Fluorination of Dienamine

    Kuraoku Daiki , Yonamine Tsunaki , Koja Genta , Yoshida Norio , Arimitsu Satoru , Higashi Masahiro

    … It is revealed that the shortness of reaction time is caused by the reactant destabilization and that the decrease in enantiomeric excess is due to the difference of hydration free energy between two transition states. …

    Molecules 24(19), 2019-10

    IR 

  • EFFECTS OF FINE AND COARSE AGGREGATE CONTENT ON PASSABILITY BETWEEN REBARS OF CONCRETE  [in Japanese]

    TERANISHI Kohji

    … The authors previously reported that though this makes little difference in compressive strength and surface quality of concrete in a member, it makes much difference in amount of rise in temperature caused by heat of hydration, Young's modulus and drying shrinkage strain.</p><p> In this study, ordinary concrete and high fluidity concrete were placed into wall forms with rebars. …

    Journal of Structural and Construction Engineering (Transactions of AIJ) (763), 1135-1143, 2019-09

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  • The effect of monovalent anion species on the aggregation and charging of allophane clay nanoparticles

    小林 幹佳 , Chihiro Takeshita , Kotaro Masuda , Motoyoshi KOBAYASHI

    … We presume that the CCC and EPM of allophane depend on the affinity of anions to the allophane surface characterized by the degree of hydration of each ion. …

    Colloids and Surfaces A: Physicochemical and Engineering Aspects (577), 103-109, 2019-09

    IR 

  • Hydrophobic Effect and Hydrophobic Interaction  [in Japanese]

    Koga Kenichiro

    <p>「水と油」のたとえ通り,両者の相互溶解度は極めて低い.25°Cの水に対するヘキサンの溶解度は12.4 mg/kg(疎水効果),ヘキサンに対する水の溶解度は90 mg/kgである(疎油効果).さらに,水中の無極性分子間には分散力以上の引力相互作用(疎水性相互作用)が働く,とされている.このような疎水効果または疎水性相互作用は,水溶液中の両親媒性分子のミクロ構造体形成やタンパク質の天 …

    Butsuri 74(11), 765-773, 2019

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