Magazine of Concrete Research最新文献_第6页

Experimental investigation on seismic behavior of eccentric RC beams with different reinforcement configurations 不同配筋结构的偏心 RC 梁抗震性能实验研究

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2024-01-23 DOI: 10.1680/jmacr.23.00104

Tai-Kuang Lee, Cheng-Cheng Chen, Guo-Luen Huang

{"title":"Experimental investigation on seismic behavior of eccentric RC beams with different reinforcement configurations","authors":"Tai-Kuang Lee, Cheng-Cheng Chen, Guo-Luen Huang","doi":"10.1680/jmacr.23.00104","DOIUrl":"https://doi.org/10.1680/jmacr.23.00104","url":null,"abstract":"In reinforced concrete buildings, the seismic behavior of RC beams with flush outside faces of beams and columns has not been verified by experiments. In this study, four large reinforced concrete beam specimens are fabricated, and the experimental verification is carried out. The research results show that: (1) All the specimens (including three beam specimens with flush outside faces of beams and columns can have ultimate drift angles of up to 4% rad; (2) The lateral strength and seismic behavior of the specimen with concrete cover of 85 mm are no less than those of the benchmark specimen, so concrete cover thickness between 85 mm and 40 mm for RC beams should be acceptable; (3) The seismic behavior of the two specimens with the lateral U-shaped auxiliary transverse reinforcement and concrete cover of 85 mm is better than that of the benchmark specimen, but the crack width of the latter specimen is wider and the spallling degree of concrete cover is more serious. It is recommended to adopt the lateral U-shaped auxiliary transverse reinforcement whose two legs extend beyond half the width of the hoop with two auxiliary longitudinal reinforcements and the same spacing as the hoop in practice.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139603186","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

Study on the durability of marine concrete with nanoparticles under the coupling action of bending fatigue load, dry-wet cycles and Cl−corrosion 弯曲疲劳载荷、干湿循环和 Cl 腐蚀耦合作用下添加纳米颗粒的海工混凝土耐久性研究

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2024-01-19 DOI: 10.1680/jmacr.23.00062

Maohua Zhang, Zhiyi Li, Lin Du, Zenong Tian, Dazhi Liu

{"title":"Study on the durability of marine concrete with nanoparticles under the coupling action of bending fatigue load, dry-wet cycles and Cl−corrosion","authors":"Maohua Zhang, Zhiyi Li, Lin Du, Zenong Tian, Dazhi Liu","doi":"10.1680/jmacr.23.00062","DOIUrl":"https://doi.org/10.1680/jmacr.23.00062","url":null,"abstract":"The combination of multiple factors in the marine environment will accelerate the corrosion of concrete structures. Unlike earlier studies, who employed alternate experiments to evaluate the endurance of marine concrete with nanoparticles under the combined impacts of bending fatigue load, dry-wet cycles, and Cl- erosion, this paper integrates three elements in each cycle to accomplish the effect of coupling. The dry-wet cycle test of the optimal amount of nano-concrete was simulated in seawater with a concentration of 5% NaCl solution and bending fatigue loads at stress levels of 0.5, 0.6, 0.7 and 0.8 were applied. X-ray diffraction was used to observe the physical phases of the concrete before and after the experiment and to analyse the reasons for the increased durability of the concrete. The results indicated that the nanoparticles enhance the resistance to Cl- erosion during dry-wet cycles and bending fatigue load by making the nano-concrete more durable under the coupling impact of bending fatigue load, dry-wet cycles, and Cl- erosion. The improvement effect is the most obvious when the nano-TiO2 content is 1% and the improvement effect is most obvious when the nano-SiO2 content is 2%, and the improvement effect is better when the nano-TiO2 content is 1% than when the nano-SiO2 content is 2%. In comparison to the compressive zone of concrete, the free Cl- in the tension zone is larger. Microscopic tests showed that nanoparticles increase the content of hydrated calcium silicate in concrete, change the orientation of calcium hydroxide and improve the durability of concrete.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139525806","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

Physio-chemical, mechanical and fracture analysis of ultra-high performance cementitious composite 超高性能水泥基复合材料的物理化学、力学和断裂分析

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2024-01-19 DOI: 10.1680/jmacr.23.00061

Awadhesh Sharma, M. A. Iqbal, S. Ray

引用次数: 0

Study on critical crack length of wet-sieved and full-graded concrete under mode I loading 模式 I 荷载下湿吸水混凝土和满级配混凝土临界裂缝长度研究

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2024-01-12 DOI: 10.1680/jmacr.23.00059

Xingyu Zheng, Zhimin Wu, Mengdi Jia

{"title":"Study on critical crack length of wet-sieved and full-graded concrete under mode I loading","authors":"Xingyu Zheng, Zhimin Wu, Mengdi Jia","doi":"10.1680/jmacr.23.00059","DOIUrl":"https://doi.org/10.1680/jmacr.23.00059","url":null,"abstract":"This study quantitatively compares the critical crack lengths of wet-sieved and full-graded concrete obtained from experimental measurements, the numerical simulation, with that from the analytical solution based on the linear elastic fracture mechanics formula (LEFM). The experiments are conducted on wedge-splitting specimens with depths from 200 mm to 1500 mm and a maximum aggregate size of 150 mm. Strain gauges and clip gauges are pasted and mounted along the direction of crack growth to measure the critical crack length. The numerical and analytical methods are used to calculate the critical crack length. The average relative error between the analytical calculations and measurements is still 14%, even if the specimen depth increases to 1500 mm. Additionally, the effective fracture toughness is calculated by combining the peak load and critical crack length, resulting in an average relative error of 17%. These results indicate that the existing analytical method is inadequate for determining the critical crack length. Consequently, a modified analytical method is adopted, utilizing the 95% peak load in the post-peak region and the corresponding crack mouth opening displacement (CMOD), which provides calculated results that agree well with experimental data. Furthermore, the effective fracture toughness can be reasonably derived using the critical crack lengths from the modified analytical method.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139533273","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 treatment method of recycled concrete aggregate by pristine graphene on mechanical and durability properties of concrete 原始石墨烯处理再生混凝土骨料的方法对混凝土力学性能和耐久性能的影响

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2024-01-11 DOI: 10.1680/jmacr.23.00213

A. Gholampour, Massoud Sofi, Youhong Tang

{"title":"Effect of treatment method of recycled concrete aggregate by pristine graphene on mechanical and durability properties of concrete","authors":"A. Gholampour, Massoud Sofi, Youhong Tang","doi":"10.1680/jmacr.23.00213","DOIUrl":"https://doi.org/10.1680/jmacr.23.00213","url":null,"abstract":"Using recycled concrete aggregates (RCAs) in concrete has emerged as a promising approach to minimize the environmental impact associated with construction and demolition waste, while simultaneously enhance the sustainability of concrete. Enhancing the quality of RCAs is crucial to instill greater confidence among material suppliers and promote the systematic utilization of RCAs in the construction industry. This study presents the use of pristine graphene suspension at 0, 0.1 and 0.2% concentrations in water for improving properties of RCAs, thereby improving mechanical and durability properties of resulting concretes incorporating 100% RCA as coarse aggregates. For this investigation, two treatment methods, including pre-spraying and pre-soaking, were used to treat the RCAs. Nano-silica with the same concentration and treatment method was also utilized to compare the results. Various strength tests including axial compressive, splitting tensile and flexural were performed. In addition, material properties such as water absorption and drying shrinkage were assessed. Microanalysis using scanning electron microscopy (SEM) and micro-CT was also employed. It is shown that, for both treatment methods investigated and nanomaterial concentrations, pristine graphene is more effective than nano-silica in increasing the strength properties and reducing the water absorption and drying shrinkage due to a lower level of material porosity. It is also found that, for a given nanomaterial concentration and type, concrete with pre-soaked RCA exhibits higher strengths and lower water absorption and drying shrinkage compared to the concrete with pre-sprayed RCA. A lower porosity and reduced number of microcracks are observed in pre-soaked RCA concrete compared to pre-sprayed RCA concrete. The results are promising and point that the treatment of the RCAs reduce their water absorption and, thereby improving mechanical and durability performance of the concrete.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139627055","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

Correlation between the automated slump test and the rheological properties of portland cement mortars 自动坍落度试验与硅酸盐水泥砂浆流变特性之间的相关性

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2024-01-11 DOI: 10.1680/jmacr.23.00150

J. B. Pereira, G. Maciel

{"title":"Correlation between the automated slump test and the rheological properties of portland cement mortars","authors":"J. B. Pereira, G. Maciel","doi":"10.1680/jmacr.23.00150","DOIUrl":"https://doi.org/10.1680/jmacr.23.00150","url":null,"abstract":"The aim of this work is to present a rheological assessment of mortars based on the automated slump test methodology. Was employed this equipment in order to monitor the transient and permanent regime of the slump test and its spread, correlating such parameters to rheological properties. Based on dimensionless slump/spread, yield stress and viscosity, were defined empirical models for obtaining rheological parameters, which provided correlations with an elevated coefficient of determination (R2 > 0.85). Through the analysis of the slump behavior of mortars, was able to define a correlation between the viscosity and the flow maximum slump velocity (R2 = 0.90), showing that the viscosity could be measured based on the slump velocity. Furthermore, with basis on a physical description of the slump test related to the Reynolds number, were defined three distinct stages in the slump process: the viscous (constituted by high viscosities), the intermediary (coexistence of viscous and inertial effects), and the inertial (characterized by low viscosities and a higher sensibility towards the lifting of the mold). Lastly, the dynamic similarity of the analyzed material (vertical and radial axes, Rez/Rer∼1) indicates that the shear rate can be measured based on the vertical direction of the flow (slump).","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2024-01-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139625585","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

Award-winning paper in 2022 2022 年获奖论文

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2024-01-01 DOI: 10.1680/jmacr.2024.76.2.108

引用次数: 0

Mechanical and thermal behavior of concrete including waste tire and glass powder as fine aggregate and cement respectively 分别以废轮胎和玻璃粉作为细骨料和水泥的混凝土机械性能和热性能

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-12-25 DOI: 10.1680/jmacr.23.00115

Reza Saghafi Lasemi, Masoud Ziaei, Mohammad Hadi Alizadeh Elizei, Reza Esmaeil Abadi

{"title":"Mechanical and thermal behavior of concrete including waste tire and glass powder as fine aggregate and cement respectively","authors":"Reza Saghafi Lasemi, Masoud Ziaei, Mohammad Hadi Alizadeh Elizei, Reza Esmaeil Abadi","doi":"10.1680/jmacr.23.00115","DOIUrl":"https://doi.org/10.1680/jmacr.23.00115","url":null,"abstract":"One of the recycling approaches of waste materials like tires and glass is to use them in concrete. In this paper, the effect of simultaneous use of waste rubber and glass powder, as partial substitution of fine aggregate and cement, on workability and mechanical properties in ambient temperature and after exposure to temperature of 600°C is investigated. In total, 13 mixtures were prepared. Except the reference mixture, the rest contained a combination of rubber particles replacing fine aggregate with the percentages of 5% and 10% by volume and glass powder replacing cement with percentages of 10%, 15% and 20%. First of all, the slump test was carried out. Moreover, compressive strength, tensile strength and ratio of tensile to compressive strength, before and after thermal exposure, and mass loss after exposure to elevated temperature were investigated. In order to have an understanding of waste materials behaviour, scanning electron microscopy and energy-dispersive X-ray spectroscopy tests were conducted. the results indicated that 5% for rubber particles, 10% for glass powder and also rubber particle size of 3-5mm presented the best results among mixtures containing rubber and glass powder, in terms of compressive and tensile strengths.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139052727","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

A review on fracture propagation in concrete: fundamentals, experimental techniques, modelling and applications 混凝土断裂扩展综述：基础、实验技术、建模和应用

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-12-25 DOI: 10.1680/jmacr.23.00143

Salim Barbhuiya, Bibhuti Bhusan Das, Fragkoulis Kanavaris

{"title":"A review on fracture propagation in concrete: fundamentals, experimental techniques, modelling and applications","authors":"Salim Barbhuiya, Bibhuti Bhusan Das, Fragkoulis Kanavaris","doi":"10.1680/jmacr.23.00143","DOIUrl":"https://doi.org/10.1680/jmacr.23.00143","url":null,"abstract":"This paper provides a comprehensive overview of fracture propagation in concrete, covering various aspects ranging from fundamentals to applications and future directions. The introduction section presents an overview of fracture propagation in concrete, emphasising its importance in understanding the behaviour of concrete structures. The fundamentals of fracture propagation are explored, including concrete as a composite material, crack initiation and propagation mechanisms, types of fractures and factors influencing fracture propagation. Experimental techniques for studying fracture propagation are discussed, encompassing both non-destructive and destructive testing methods, such as acoustic emission, ultrasonic testing, digital image correlation and advanced imaging techniques like X-ray tomography and scanning electron microscopy. Modelling approaches, including continuum damage mechanics, finite element method, discrete element method, lattice discrete particle model and hybrid modelling approaches, are reviewed for simulating and predicting fracture propagation behaviour. The applications of fracture propagation in concrete are highlighted, including structural health monitoring, design optimisation, failure analysis and repair and rehabilitation strategies. The research opportunities for further improvement are addressed. The paper serves as a valuable resource for researchers, engineers and professionals in the field, providing a comprehensive understanding of fracture propagation in concrete and guiding future research endeavours.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139052644","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

Numerical simulation and design of circular steel-reinforced concrete-filled steel tubular short columns under axial loading 轴向荷载下圆形钢筋混凝土填充钢管短柱的数值模拟与设计

IF 2.7 4区工程技术

Magazine of Concrete Research Pub Date : 2023-12-20 DOI: 10.1680/jmacr.23.00153

Mizan Ahmed, Saad A. Yehia, Ramy I. Shahin, Mohamed Emara, Vipulkumar Ishvarbhai Patel, Qing Quan Liang

{"title":"Numerical simulation and design of circular steel-reinforced concrete-filled steel tubular short columns under axial loading","authors":"Mizan Ahmed, Saad A. Yehia, Ramy I. Shahin, Mohamed Emara, Vipulkumar Ishvarbhai Patel, Qing Quan Liang","doi":"10.1680/jmacr.23.00153","DOIUrl":"https://doi.org/10.1680/jmacr.23.00153","url":null,"abstract":"This paper presents a computational model for determining the axial responses of circular Steel-Reinforced Concrete-Filled Steel Tubular (SRCFST) short columns. A novel confinement model is formulated for the concrete-core that is effectively confined by the external circular steel tube and the embedded steel section. The modeling scheme of confinement is programmed in the mathematical model that utilizes the fiber element discretization of column cross-sections. The numerical predictions are verified by experimental measurements and results obtained from the finite element analysis, demonstrating the accuracy of the modeling technology. In addition, existing concrete confinement models for concrete in circular Concrete-Filled Steel Tubular (CFST) columns are assessed. The new confinement model is shown to be superior in replicating the responses of SRCFST columns. The influences of design parameters on the column's performance are numerically investigated and the importance order of these parameters is determined by a sensitivity analysis. The study not only examines the validity of current design standards in determining the axial load capacity of SRCFST columns but also proposes a new design formula. The proposed confinement model can be employed in numerical procedures for the inelastic simulation of SRCFST columns and the design formula is suitable for use in practical design.","PeriodicalId":18113,"journal":{"name":"Magazine of Concrete Research","volume":null,"pages":null},"PeriodicalIF":2.7,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138818579","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