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

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":"42 1","pages":""},"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}

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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

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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

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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":"18 1","pages":""},"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}

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Investigation on Preparation and Application in Concrete of Physically Modified Fly Ash 物理改性粉煤灰的制备及在混凝土中的应用研究

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-02-17 DOI: 10.3151/jact.22.77

Sun Zhisheng, Zhu Wenshang, Ma Zhaomo, Wang Xingqin, Yang Zhongmao, Zou Chunye, Huang Qin, Feng Xianxu, Rao Zhengtang

{"title":"Investigation on Preparation and Application in Concrete of Physically Modified Fly Ash","authors":"Sun Zhisheng, Zhu Wenshang, Ma Zhaomo, Wang Xingqin, Yang Zhongmao, Zou Chunye, Huang Qin, Feng Xianxu, Rao Zhengtang","doi":"10.3151/jact.22.77","DOIUrl":"https://doi.org/10.3151/jact.22.77","url":null,"abstract":"Raw fly ash (RFA) was modified by a self-developed new dry energy-saving vertical grinding mill. This was beneficial to improve the particle morphology and distribution of RFA and enhanced its practical applicability in cement and concrete. The physical modification mechanism of RFA was elucidated by simulating the grinding process, and the physical properties and the application performance of modified fly ash (MFA) were characterized. The results demonstrated that the new grinder can effectively realize the physical modification of RFA and significantly improve its properties because the porous structure and the intactness of glass beads of RFA are preserved without being destroyed. The fineness of MFA was improved to the standard of Class I or II fly ash, the 28 d strength activity index of which was increased by 7% to 17%. The fluidity of mortar was also improved by 15 to 34 mm. In addition, the water requirement ratio can be significantly reduced when MFA is used to prepare C30 and C45 concrete. The 28 d strength of concrete with 50% content of MFA was increased by 23.76% and 15.84%, respectively. These results suggest that the grinding process studied here is a novel method for improving the performance of MFA.\u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":"6 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139901977","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}

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Development of Post-installed Headed Bars Embedded into Grouted Holes with Enlarged Ends 将后安装封头钢筋嵌入扩大端部的灌浆孔中的发展情况

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-01-24 DOI: 10.3151/jact.22.62

Hassane Ousalem, Gin Horiuchi, Akitoshi Hamada, Hiroto Takatsu, Yuki Idosako, Hiroyuki Masuda, Yuki Hiroshima

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Experimental Study of Bonding Performance of Post-installed Rebar Anchors under Unilateral Pressure 后安装钢筋锚固件在单侧压力下的粘结性能实验研究

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-01-23 DOI: 10.3151/jact.22.47

Ning-yu Zhao, Ailin Yang, Hao Liu, Yi Song, Haifei Jiang

{"title":"Experimental Study of Bonding Performance of Post-installed Rebar Anchors under Unilateral Pressure","authors":"Ning-yu Zhao, Ailin Yang, Hao Liu, Yi Song, Haifei Jiang","doi":"10.3151/jact.22.47","DOIUrl":"https://doi.org/10.3151/jact.22.47","url":null,"abstract":"Post-installed rebar (PIR) is extensively utilized for rehabilitating, strengthening, and retrofitting existing concrete structures, and its anchorage design greatly concerns the failure mode and tensile behavior. PIR anchored in joints or columns generally suffers pressures normal to its anchorage section in one direction, and PIR's failure mode and tensile behavior can be greatly affected. However, limited research on the unilateral pressure effect for PIR has been conducted, with remaining uncertainties on applications and designs for PIR. Thus, this paper carried out the pull-out tests of 38 specimens with various anchorage conditions (20 unilateral pressure specimens, 14 no-lateral pressure specimens, and four bilateral pressure specimens) to investigate the bond behavior for PIR subjected to unilateral pressure. Besides, the effects of concrete strength, rebar diameter, and anchorage length on PIR under unilateral pressure were also considered in the tests. The test results showed that the no-lateral pressure specimens split in the concrete and adhesive layer. In contrast, the unilateral and bilateral pressure specimens occurred two typical failures [adhesive-rebar (A-R) interface failure and adhesive fracture failure]. In addition, the interfacial damage and cracking pattern were discussed in detail. Then, the bond strength and bond slip of specimens were investigated. The result showed that the bond strength under unilateral pressure was greater than that under no-lateral pressure but less than that under bilateral pressure, and there was no obvious change in bond strength while the unilateral pressure increased. Regarding bond slip, it was found that the bond slip increased with the bond strength. This paper performed an experimental investigation on failure modes and cracking patterns for PIR under unilateral pressure. It analyzed the unilateral pressure effect on the bond performance for PIR, raising the safety considerations about PIR applications in load-bearing structures.\u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":"109 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139552139","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

Multi-exponential Inversion of the Relaxometry Data of Low-field Nuclear Magnetic Resonance for Cement-based Materials 水泥基材料低场核磁共振弛豫测量数据的多指数反演

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-01-20 DOI: 10.3151/jact.22.33

Xiaoyu Zhang, Chunsheng Zhou, Jing Qiao, Le Li, Lizhi Xiao

{"title":"Multi-exponential Inversion of the Relaxometry Data of Low-field Nuclear Magnetic Resonance for Cement-based Materials","authors":"Xiaoyu Zhang, Chunsheng Zhou, Jing Qiao, Le Li, Lizhi Xiao","doi":"10.3151/jact.22.33","DOIUrl":"https://doi.org/10.3151/jact.22.33","url":null,"abstract":"Low-field Nuclear Magnetic Resonance (LF-NMR) technique has been attracting increasing concern in nondestructively characterising cement-based materials (CBMs), whose nanoscale pore structure are sensitive to water removal. In order to achieve the multi-exponential inversion of relaxometry data preferred by the interpretation on local pore structure of CBMs, an algorithm incorporating L1 regularisation with capability of yielding sparse solution is developed with the aids of Interior-Point method and various principles for optimising the regularisation parameter. Numerical analyses on representative cases show that, the proposed algorithm equipped with the Morozov discrepancy principle is capable of resolving all artificially designed exponential components of various intensities with satisfactory accuracy and precision, even at relatively low signal-to-noise ratio. When applying to resolve the relaxometry data obtained on a cement paste, the algorithm is good at characterising its pore structure with clear significance and capturing its detailed evolution during curing under hot water with good precision.\u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":"17 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139508679","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 Temperature on the Early-age Hydration and Setting Behaviour of Mixes Containing GGBS 温度对含 GGBS 混合料早期水化和凝结行为的影响

IF 2 4区工程技术

Journal of Advanced Concrete Technology Pub Date : 2024-01-12 DOI: 10.3151/jact.22.14

Fragkoulis Kanavaris, Marios Soutsos, Jian-Fei Chen

{"title":"Effect of Temperature on the Early-age Hydration and Setting Behaviour of Mixes Containing GGBS","authors":"Fragkoulis Kanavaris, Marios Soutsos, Jian-Fei Chen","doi":"10.3151/jact.22.14","DOIUrl":"https://doi.org/10.3151/jact.22.14","url":null,"abstract":"Over the past years there has been an increasing trend to use supplementary cementitious materials in concrete to improve its sustainability credentials and durability properties. Perhaps amongst the most popular supplementary cementitious materials is ground granulated blast-furnace slag (GGBS). While the hydration and setting characteristics of mixes with GGBS cured under standard conditions (20°C) has been adequately investigated, the effect of temperature on heat of hydration and setting and the interrelation of these properties has not been evaluated for GGBS containing mixes. In this study, the heat of hydration and setting behaviour of mixes with various levels of GGBS (0, 20, 35, 50 and 70%) cured under elevated temperatures (20, 30, 40, 50 and 60°C) is determined. Elevated curing temperature accelerates the hydration reactions and can significantly reduce the setting time of GGBS-containing mixes. The investigation of heat of hydration at very early ages, can provide an indication of the initial and final setting times of cementitious mixes. The “apparent” activation energy used to characterise temperature sensitivity of cementitious systems, is calculated based on heat of hydration and setting time measurements. It was found that the “apparent” activation energy increases with GGBS content for both heat of hydration and setting behaviour. The value of “apparent” activation energy differs significantly depending on the material property that is considered, such as compressive strength, heat of hydration or setting time.\u0000","PeriodicalId":14868,"journal":{"name":"Journal of Advanced Concrete Technology","volume":"37 1","pages":""},"PeriodicalIF":2.0,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139464352","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