Journal of Advanced Concrete Technology最新文献_第3页

CO2 Sequestration Through Aqueous Carbonation of Electric Arc Furnace Slag 通过电弧炉炉渣水碳化封存二氧化碳

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-04-12 DOI: 10.3151/jact.22.207

Francesca Bonfante, Giuseppe Ferrara, Pedro Humbert, Davide Garufi, Jean-Marc Christian Tulliani, Paola Palmero

引用次数: 0

Assessment on Bond Strength of CFRP Sheet Bonded to Concrete Focused on Sheet Stiffness 以片材刚度为重点评估与混凝土粘接的 CFRP 片材的粘接强度

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-04-05 DOI: 10.3151/jact.22.190

Mitsuhiko Ozaki, Yasuhiko Sato, Eiji Yoshida, Aya Takeuchi, Yuta Yamada, Fumiaki Nagashima

{"title":"Assessment on Bond Strength of CFRP Sheet Bonded to Concrete Focused on Sheet Stiffness","authors":"Mitsuhiko Ozaki, Yasuhiko Sato, Eiji Yoshida, Aya Takeuchi, Yuta Yamada, Fumiaki Nagashima","doi":"10.3151/jact.22.190","DOIUrl":"https://doi.org/10.3151/jact.22.190","url":null,"abstract":"In previous studies on the bond behaviors of FRP sheets attached to concrete, specimens for bond tests that contained FRP sheets with relatively low stiffnesses were used. However, in actual strengthening design, high stiffnesses of FRP sheets are required because the scale of the structure is very large. Therefore, in this study, bond tests were conducted using specimens with many different sheet stiffnesses and with polyurea resin. As a result, the bond strength increased as the stiffness increased with multiple CFRP sheets. Nevertheless, existing bond strength models overestimated the bond strength when the stiffness exceeded 200 kN/mm. In addition, 3D scanning measurements of patterned and indented concrete thin layers behind CFRP sheets revealed that the interfacial fracture energy was strongly related to the surface area of the concrete thin layer, not to the CFRP sheet stiffness or the resin properties.This paper is an English translation of the authors’ previous work [Ozaki, M., Sato, Y., Yoshida, E., Takeuchi, A., Yamada, Y. and Nagashima, F., (2023). “Assessment on bond strength of CFRP sheet bonded to concrete focused on sheet stiffness.” Journal of JSCE, 79(6), 22-00289. (in Japanese)].\u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140585012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Bond Strength of Post-installed Anchor Adhering to Damaged Concrete by Freeze-thaw Action 冻融作用下后置锚固件与受损混凝土的粘结强度

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-04-03 DOI: 10.3151/jact.22.178

Yuga Yano, Taito Shiokoshi, Yuya Takase, Yutaro Ishida, Takahide Abe, Muneomi Takahashi, Tsutomu Ishigaki

{"title":"Bond Strength of Post-installed Anchor Adhering to Damaged Concrete by Freeze-thaw Action","authors":"Yuga Yano, Taito Shiokoshi, Yuya Takase, Yutaro Ishida, Takahide Abe, Muneomi Takahashi, Tsutomu Ishigaki","doi":"10.3151/jact.22.178","DOIUrl":"https://doi.org/10.3151/jact.22.178","url":null,"abstract":"Reinforced concrete (RC) structures in cold regions are susceptible to surface deterioration due to freeze-thaw cycles (FTC). For sustainable development goals (SDGs) and a decarbonized society, damaged structures should be repaired and reinforced. Post-installed anchors are commonly used for seismic retrofitting and equipment fixation. However, research on the bond characteristics of damaged concrete is limited. Therefore, in this study, the bonding performance of adhesive anchors in damaged concrete was investigated. Liquid nitrogen was employed to subject the concrete surface to FTC; subsequently, bond-slip tests were conducted with the degree of deterioration serving as a parameter. The results suggested, the bond strength decreased as the degree of damage increased. The reduction ratios of the post-installed anchor with epoxy and cement-based resins were almost identical. Furthermore, a bond strength equation was proposed by referring to the bond-slip model between the rebar and concrete (fib 1990). The test results were well predicted with a correlation coefficient of 0.94. This study is based on previous studies (Yano et al. 2022, 2023) but presents new findings.\u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140584591","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The GBESO Method Based on FEA with Discrete Models and Application for Aided Design to Members in RC D-Region 基于离散模型有限元分析的 GBESO 方法及其在 RC D 区构件辅助设计中的应用

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-03-29 DOI: 10.3151/jact.22.162

Hu-zhi Zhang, Yi-jun Kang, Li-kun Li, Jian-qun Wang

{"title":"The GBESO Method Based on FEA with Discrete Models and Application for Aided Design to Members in RC D-Region","authors":"Hu-zhi Zhang, Yi-jun Kang, Li-kun Li, Jian-qun Wang","doi":"10.3151/jact.22.162","DOIUrl":"https://doi.org/10.3151/jact.22.162","url":null,"abstract":"To better utilize topology optimization theory to assist in designing reinforced concrete (RC) D-region members, a novel application mode, the Genetic Bi-directional Evolutionary Structural Optimization (GBESO) method based on Finite Element Analysis (FEA) with discrete models is proposed. Correspondingly a design method for reinforcement layout of RC D-region members is also derived. Non-linear FEA verification is conducted on numerical examples involving deep beams with openings. The results demonstrate that the GBESO algorithm exhibits better global optimization capacities compared to Evolutionary Structural Optimization-type (ESO-type) algorithms. It also provides rebar topologies that are more in line with the optimization objective, bringing lower steel consumption and higher rebar utilization rates. Moreover, by introducing inclined rebar to the members, their shear strength is enhanced to a level comparable to the flexural one, significantly improving ultimate load-bearing capacity, elastoplastic deformation capacity, and better ductility compared to empirical method. \u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140325451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The Effect of SCMs on the Resistance of Steam-cured Concrete to Chloride Attack in the Tidal Zone of Real Marine Environment 单体材料对真实海洋环境潮汐区蒸汽养护混凝土抗氯化物侵蚀能力的影响

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-03-26 DOI: 10.3151/jact.22.149

Xiaofeng Han, Lixiao Zhao, Xiaoguang Sun, Li Tian, Zhenxing Du, Penggang Wang

{"title":"The Effect of SCMs on the Resistance of Steam-cured Concrete to Chloride Attack in the Tidal Zone of Real Marine Environment","authors":"Xiaofeng Han, Lixiao Zhao, Xiaoguang Sun, Li Tian, Zhenxing Du, Penggang Wang","doi":"10.3151/jact.22.149","DOIUrl":"https://doi.org/10.3151/jact.22.149","url":null,"abstract":"Steam curing is a widely used technique for producing precast concrete components in practical engineering. Chloride attack is a main factor that leads to the corrosion of rebars in concrete structures, which significantly affects the durability and safety of concrete structures in marine environments. In this paper, XRD, LF-NMR, 29Si NMR, and 27Al NMR were used to investigate the microstructure evolution of steam-cured concrete and standard-cured concrete. Then, the steam-cured and standard-cured concrete were subjected to actual marine exposure tests to explore the microstructure evolution of concrete and the chloride erosion behavior in the tidal zone. The results showed that steam-curing can increase the average molecular chain length (MCL) and polymerization degree of C-(A)-S-H, promote the transformation of silicon-oxygen tetrahedral dimer to polymer, and increase the Q2/Q1 value of steam-cured concrete to twice that of standard-cured concrete. Compared to standard-cured specimens, steam-cured concrete specimens had significantly more harmful pores and multi-harmful pores. With the increase of exposure time to the marine environment, the depth of the convection zone inside the concrete did not change significantly, however, the peak value of chloride concentration increased gradually. The addition of SCMs to steam-cured concrete reduced the content of free and total chloride, which was well explained by microscopic tests. The concentration of chloride on the surface and chloride diffusion coefficient of steam-cured concrete showed a quadratic function relationship with the increase of slag content, and an exponential decay relationship with the content of fly ash.\u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140313091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Extraction of Carbonation Rate from Depth Profile of Concrete Carbonation by using Pseudo-analytical Solution of Two-component Reaction-diffusion Equation 利用双组分反应-扩散方程的伪解析解从混凝土碳化深度剖面提取碳化率

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-03-21 DOI: 10.3151/jact.22.139

Tsuneki Ichikawa, Kazuko Haga, Kazuo Yamada

引用次数: 0

Structural Behaviors of Steel Tube-encased Concrete Columns Confined by Bolted Circular Thin Steel Tube 螺栓连接圆形薄钢管限制的钢管包裹混凝土柱的结构行为

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-03-12 DOI: 10.3151/jact.22.115

Chi Zhang, Koki Yamaoka, Takashi Fujinaga, Yuping Sun

{"title":"Structural Behaviors of Steel Tube-encased Concrete Columns Confined by Bolted Circular Thin Steel Tube","authors":"Chi Zhang, Koki Yamaoka, Takashi Fujinaga, Yuping Sun","doi":"10.3151/jact.22.115","DOIUrl":"https://doi.org/10.3151/jact.22.115","url":null,"abstract":"Six square steel tube-encased concrete (SC) columns confined by bolted circular thin steel tube were fabricated and tested under cyclical reversed lateral load to investigate their structural behavior. The primary experimental variables included the axial load ratio, the grade of the encased square steel tubes (FB rank and FC rank), the infilling of concrete into the encased steel tube, and the thickness of outer circular bolted thin steel tubes. Experimental results revealed that confinement by the bolted circular thin steel tube with outer-diameter-to-thickness ratio of 189 could ensure sufficient ductility to the SC columns, and the bolted thin steel tube did not rupture until the drift angle of about 0.09 rad. Furthermore, a simple evaluation method for the ultimate flexural strength of SC column section was proposed along with a numerical analytical method to predict the overall behavior of SC columns. The proposed methods can take the confinement effect by the bolted circular steel tube into consideration. Fairly good agreement between the experimental results and the calculated ones verified the reliability and accuracy of the proposed methods.\u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140107378","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of Fly Ash Content on Rheological Properties of Self-compacting Geopolymer Mortar 粉煤灰含量对自密实土工聚合物砂浆流变特性的影响

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-03-09 DOI: 10.3151/jact.22.103

Muhammad Talha Ghafoor, Chikako Fujiyama

引用次数: 0

Estimation of the Protected Paste Volume by Spatial Tessellation Associated with the Point Pattern of Air Voids 通过与气泡点模式相关的空间细分估算保护浆料体积

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-03-09 DOI: 10.3151/jact.22.128

Kazuya Ohyama, Soshi Yamashita, Shin-ichi Igarashi

引用次数: 0

Shear Behaviour of Full-Scale Squat Shear Walls with and without Precast Pre-walls 有预制预墙和无预制预墙的全尺寸蹲式剪力墙的剪力行为

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-02-28 DOI: 10.3151/jact.22.86

Eissa Fathalla, Bertrand Ringeisen, Marc Lenges, Boyan Mihaylov

{"title":"Shear Behaviour of Full-Scale Squat Shear Walls with and without Precast Pre-walls","authors":"Eissa Fathalla, Bertrand Ringeisen, Marc Lenges, Boyan Mihaylov","doi":"10.3151/jact.22.86","DOIUrl":"https://doi.org/10.3151/jact.22.86","url":null,"abstract":"Reinforced concrete shear walls are commonly used in buildings to resist lateral loads due to wind and seismic action. They are typically either cast-in-place or precast, with the latter solution used to achieve high construction speed and quality control. At the same time, the main challenge with precast solutions is to ensure appropriate connections between the adjacent walls, as well as the anchorage of the walls in the foundations. A hybrid structural system combining precast and cast-in-place concrete can provide the advantages of both methods such as faster construction, better quality control, improved structural performance, and durability. This study focuses on investigating the shear behaviour of squat hybrid shear walls through full-scale experimental testing. The tests include one conventional cast-in-place wall and one hybrid wall with a pre-wall system (two precast walls) and cast-in-place concrete core. Detailed measurements and kinematic-based modelling are used to develop comprehensive understanding of the behaviour of the test specimens. It is shown that the hybrid method of construction does not affect the stiffness of the walls and results in a slight reduction of shear strength. It is also shown that the three-parameter kinematic theory can be used to predict the shear strength and key deformation components of the tested walls.\u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":null,"pages":null},"PeriodicalIF":2.0,"publicationDate":"2024-02-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140007810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0