Search Results 1-20 of 432

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Comparison between the Effect of the Recycled Aggregate and its Original Aggregate for the Expansion Ratio of Concrete due to Alkali-Silica Reaction [in Japanese]

古賀裕久 , 片平博

コンクリート構造物の補修,補強,アップグレード論文報告集 Proceedings of the Concrete Structure Scenarios, JSMS 20, 191-196, 2020-10
2

Study on the Mixture and Property of Concrete with Carbon-free Fly Ash packaged in Water-dispersible Paper [in Japanese]

河村彰男 , 武田隆 , 庄司啓明 , 佐藤貴之

コンクリート工学 58(10), 814-821, 2020-10
3

STUDY ON THE EVALUATION AND SUPPRESSION OF ALKALI-SILIKA REACTION OF CONCRETE USING LOW-QUALITY RECYCLED AGGREGATE:Recycling system of concrete waste incurred from building demolition [in Japanese]

DOSHO Yasuhiro

… Thus, it is necessary to perform quality control in combination with other tests. As suppression methods, the specified value of total alkali amount can be satisfied by appropriate use of cement and admixture. … In addition, the effect of alkali-silica reaction suppression by using a certain amount of fly ash type II was clearly recognized. …

AIJ Journal of Technology and Design (63), 434-439, 2020-06

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4

Analysis on the Utilization of Opinion of Bridge Inspection Results Using Topic Model for Maintenance and Management

Ogawa Fukutsugu , Chikata Yasuo

… In this study, topics have been organized by high probability words about deterioration due to ASR (Alkali-Silica Reaction), which is a characteristic deterioration in the Hokuriku region. …

MATERIALS TRANSACTIONS 61(12), 2428-2434, 2020

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5

Effect of Alkali-silica Reaction on Delayed Ettringite Formation in Concrete

YAMAZAKI Yuki , TSURUTA Koji , UEHARA Motoki

… We investigated the effects of alkali-silica reaction (ASR) on delayed ettringite formation (DEF) using mortar test pieces comprising ASR reactive aggregates with added potassium sulfate under various environmental conditions. …

Quarterly Report of RTRI 61(3), 192-197, 2020

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6

Restraint Effect of Reinforcing Bar on ASR Expansion and Deterioration Characteristic of the Bond Behavior

Li Pengfei , Tan Ni , An Xuehui , Maekawa Koichi , Jiang Zhengshi

… To investigate the restraint effect of reinforcing bar on the expansion induced by alkali-silica reaction (ASR), and assess the mechanical behavior of reinforced concrete (RC) structure damaged by ASR, pullout tests of specimens with different ASR expansion were conducted. …

Journal of Advanced Concrete Technology 18(4), 192-210, 2020

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7

QUALITY AND PERFORMANCE EVALUATION OF CONCRETE USING COAL ASH CLASSIFIED AS TYPE Ⅳ FLY ASH [in Japanese]

SAKAKIBARA Naoki , TOMIDUKA Shota , KODA Yasuhiro , IWAKI Ichiro

本研究ではフライアッシュⅣ種で管理されるがⅡ種の品質規定も一部満足する未利用の石炭灰を対象に、コンクリート用混和材としてセメントの20％質量を外割り添加したコンクリートの品質・性能評価を行った。その結果、本石炭灰はセメントと細骨材を補間する粉体としてワーカビリティーを阻害せず、コンクリートの空気連行性を確保できることが確認された。この結果を踏まえ、生コ …

Cement Science and Concrete Technology 73(1), 176-183, 2020

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8

EVALUATION OF ASR DETERIORATION IN RC ROAD BRIDGE DECKS BY THE EXPOSURE TEST [in Japanese]

KISHIRA Ryo , MAESHIMA Takuya , KODA Yasuhiro , IWAKI Ichiro

本研究は、実環境下の道路橋RC床版におけるアルカリシリカ反応（ASR）による劣化性状について実験的に明らかにしたものである。鋼主桁上に実物大RC床版を架設し屋外暴露することで実橋における環境作用と主桁による拘束を再現し、長期的に各種計測を実施した。その結果、実環境ではASRの温度依存性により膨張量は周期的変動を有し、劣化の進行に伴い膨張開始温度が低下する傾向を示した。また、偏光顕 …

Cement Science and Concrete Technology 73(1), 303-310, 2020

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9

Analysis on the Utilization of Opinion of Bridge Inspection Results Using Topic Model for Maintenance and Management [in Japanese]

OGAWA Fukutsugu , CHIKATA Yasuo

… A topic has been organized by high probability words about deterioration due to ASR (Alkali-Silica Reaction), which is a characteristic deterioration in the Hokuriku region. …

Journal of the Society of Materials Science, Japan 69(3), 197-203, 2020

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10

Influence of Alkali-Silica Reaction on Delayed Ettringite Formation in Concrete [in Japanese]

山崎由紀 , 上原元樹 , 鶴田孝司

鉄道総研報告 = RTRI report : 鉄道総合技術論文誌 33(11), 5-10, 2019-11
11

Investigations on Mechanical Properties of Concrete Damaged due to Alkali-Silica Reaction Based on Compressive Fatigue Tests in Submerged Condition [in Japanese]

西川泰正 , 三木朋広

コンクリート構造物の補修,補強,アップグレード論文報告集 Proceedings of the Concrete Structure Scenarios, JSMS 19, 43-46, 2019-10
12

A Review of Measurements and Modellings of Mechanical Properties of Products by Alkali-Silica-Reaction in Concrete [in Japanese]

高橋佑弥

コンクリート工学 57(6), 454-460, 2019-06
13

Evaluation of concrete structure damaged by ASR by means of SWF method [in Japanese]

Sagradyan Artur , OGURA Norihiko

… However, elastic wave velocity is known to be not very sensitive to microcracking, which can be caused by alkali-silica reaction (ASR). …

The Proceedings of Mechanical Engineering Congress, Japan 2019(0), J40153, 2019

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14

An analytical study about the deformation behavior of a real scale RC bridge deck on steel girders with alkali silica reactions in real environmental conditions [in Japanese]

Takahashi Yuya , Maeshima Takuya , Iwaki Ichiro , Maekawa Koichi

… This study investigates the deformation behavior of RC bridge decks suffering from expansions due to alkali silica reactions (ASR). … Based on the parametric analyses for reaction coefficient and the effect of the temperature, the long-term free expansions of specimens can be reproduced with the multi-scale calculation scheme. …

Journal of Structural Engineering, A 65A(0), 665-673, 2019

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15

Seismic Analysis of the Kleinplaas Dam Affected by Alkali-Silica Reaction Using a Chemo-Thermo-Mechanical Finite Element Numerical Model Considering Fluid Structure Interaction

Pourbehi Mohammad Sadegh , van Zijl Gideon P. A. G.

… Alkali Silica Reaction (ASR) is a long term chemical reaction causes swelling and damage to the concrete material in the form of cracking and material deterioration. …

Journal of Advanced Concrete Technology 17(8), 462-473, 2019

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16

Mechanisms of Alkali-Silica Reaction in Alkali-Activated High-Volume Fly Ash Mortars

Ye Hailong , Chen Zhijian

… Alkali-activation of high-volume fly ash (HVFA) is a viable approach to produce durable cementitious binders with faster and stronger strength development than its water-activated counterparts. … However, the use of alkaline activator increases the risk of alkali-silica reaction (ASR) in these systems. …

Journal of Advanced Concrete Technology 17(6), 269-281, 2019

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17

Long-term Material Properties of a Thick Concrete Wall Exposed to Ordinary Environmental Conditions in a Nuclear Reactor Building: the Contribution of Cement Hydrates and Feldspar Interaction

Rymeš Jiří , Maruyama Ippei , Shimamoto Ryu , Tachibana Atsushi , Tanaka Yoshihito , Sawada Shohei , Ichikawa Yoshikazu , Kontani Osamu

… It is found that this trend can be mostly attributed to the reaction between cement hydrates and rock-forming minerals of a feldspar group, which releases silica and alumina oxides into the pore solution, where they react with portlandite to form new hydrates. … No evidence of expansive distress similar to the alkali-silica reaction (ASR) is found in the material, owing to this reaction. …

Journal of Advanced Concrete Technology 17(5), 195-215, 2019

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18

EXPERIMENTAL STUDY ON REPAIR OF ASR INDUCED CRACK IN CONCRETE USING MICROORGANISMS [in Japanese]

LUAN Yao , MUTSUYOSHI Hiroshi , FANG Jie , KAWANA Rikako

コンクリートのひび割れの補修について、近年では微生物を用いた斬新な補修法が提案されている。本研究では、微生物系補修材の実用化を目的として、食品発酵用のイースト菌、土壌に多く存在する好アルカリのバチルス菌をそれぞれ用いて補修材を調製し、モルタルに生じた貫通ひび割れ、およびASR促進試験で発生したひび割れに対して補修を試みた。その結果、いずれの供試体においても、補修後ひび割れ中に炭酸 …

Cement Science and Concrete Technology 72(1), 328-335, 2019

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19

EMPIRICAL RESEARCH ON PERFORMANCE EVALUATION OF HIGHLY DURABLE RC ROAD BRIDGE DECK AT CONSTRUCTION PROCESS [in Japanese]

SAKAKIBARA Naoki , TANAKA Yasushi , SATO Kazunori , IWAKI Ichiro

寒冷地の道路橋RC床版は冬期に凍結防止剤が散布されるため、近年、塩害、塩分環境下の凍害やアルカリシリカ反応（ASR）により、交通量の少ない地域であっても耐久性を損ねる劣化事例が報告されはじめてきた。そのため、RC床版自体の耐久性を高める必要性が指摘されている。本研究では、耐凍害性、遮塩性やASR抵抗性の高いコンクリートと防錆被覆鉄筋等を用いた多重防護の考えを導入し、その性能を発揮 …

Cement Science and Concrete Technology 72(1), 277-284, 2019

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20

EFFECTS OF INCREASE IN BOTH C3A AMOUNT AND MINOR ADDITIONAL CONSTITUENTS IN CEMENT ON EXPANSION OF MORTARS WITH ALKALI SILICA REACTIVE SAND IN HIGH ALKALI SOLUTION [in Japanese]

GOTO Suguru , ITOH Takayasu

高C3A型セメントをベースとして少量混合成分（石灰石、フライアッシュ、高炉スラグ）を10％添加したセメントについて、反応性骨材を用いたモルタルの高温高アルカリ（NaOH）溶液中での膨張特性（ASTM C1260に準拠）を評価した。モルタル膨張量は、高C3A型セメントをベースにフライアッシュ …

Cement Science and Concrete Technology 72(1), 83-90, 2019

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