International Journal of Concrete Structures and Materials最新文献_第6页

Effect of Fiber Orientation on the Fatigue Behavior of Steel Fiber-Reinforced Concrete Specimens by Performing Wedge Splitting Tests and Computed Tomography Scanning 通过楔形劈裂试验和计算机断层扫描分析纤维方向对钢纤维加固混凝土试样疲劳行为的影响

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2024-01-12 DOI: 10.1186/s40069-023-00639-8

D. González, Álvaro Mena-Alonso, J. Mínguez, J. A. Martínez, Miguel A. Vicente

引用次数: 0

Improving Bond Performance of Near-Surface Mounted Steel Ribbed and Threated Rods in the Concrete 改善混凝土中近表面安装的带肋钢筋和经过处理的钢筋的粘结性能

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2024-01-09 DOI: 10.1186/s40069-023-00643-y

Sabry Fayed, Emrah Madenci, Yasin Onuralp Özkiliç, Mohamed H. Zakaria

{"title":"Improving Bond Performance of Near-Surface Mounted Steel Ribbed and Threated Rods in the Concrete","authors":"Sabry Fayed, Emrah Madenci, Yasin Onuralp Özkiliç, Mohamed H. Zakaria","doi":"10.1186/s40069-023-00643-y","DOIUrl":"https://doi.org/10.1186/s40069-023-00643-y","url":null,"abstract":"In this study, the experimental findings of twenty pull-out tests on the bond efficiency of threaded/ribbed steel rods used in near-surface mounting (NSM) are presented. On a groove (20 × 20 mm) that was slotted in one of the sides of a concrete block measuring 250 × 250 × 200 mm, a pull-out experiment was performed. The primary factors are the slot-filling materials (substrate concrete and epoxy paste), bonded length (equal to 5, 7, 10, and 15 times the rod diameter), surface pattern conditions (conventional ribbed reinforcing rebar and threaded bolt), use of nuts or rings welded at the free end of the bonded length, and use of straight or spiral wire welded along the length of the bonded length. The tested specimens' ultimate bond strength, slip, bond stress–slip response, failure patterns, stiffness, and ductility are recorded and assessed. The results showed that the ultimate bond strength and corresponding slip of ribbed rods cemented with epoxy were higher by 11.11% and 199%, respectively, than those of ribbed rods submerged in the substrate. Over the controls, all NSM epoxy-rods exhibited a greater ductility. As the bonded length increased, the ultimate bond strength of NSM rods fell by 12–32%. As the bonded length increased, the stiffness decreased. On the other hand, the ductility of NSM epoxy-rods increased as the bonded length increased. All applied schemes such as nuts, rings, longitudinal bars, and spiral bars significantly improved the ultimate bond strength (maximum = 25.93%) and corresponding slip (maximum = 166.67%) of NSM threaded rods as compared to the control ones.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":"49 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-01-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139409245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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 Crack Resistance and Calculation Model of RAC Beams Strengthened with Prestressed CFRP 使用预应力 CFRP 加固的 RAC 梁的抗裂性和计算模型研究

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2024-01-04 DOI: 10.1186/s40069-023-00638-9

{"title":"Study on Crack Resistance and Calculation Model of RAC Beams Strengthened with Prestressed CFRP","authors":"","doi":"10.1186/s40069-023-00638-9","DOIUrl":"https://doi.org/10.1186/s40069-023-00638-9","url":null,"abstract":"<h3>Abstract</h3> With the development of recycled aggregate concrete (RAC), the recovery rate of construction waste is improved, and the pollution problem is alleviated. In particular, RAC beams strengthened with prestressed carbon fiber reinforced plastics (CFRP) can exhibit improved mechanical properties, expanding RAC application. Four groups of reinforced RAC beam specimens contained 0%, 40%, 70%, and 100% recycled coarse aggregate, respectively. Each group of beams was first pre-cracked and then strengthened by prestressed CFRP with one layer and two layers respectively. Finally, the bearing capacity tests were performed for these beams. The test results show that as the recycled coarse aggregate content increases, the cracking moment and ultimate load capacity of the beam decrease, while its crack width increases. As the CFRP layer increases, the deformation and crack width of the beam decreases, while the number of cracks increases. The prestressed CFRP also exhibited tensile and peeling failure. A beam deflection calculation model was established by introducing a coefficient k representing the interaction between recycled aggregate and CFRP. The influence coefficient of concrete elongation on the crack width and average crack spacing of the beam was modified, and the crack width analysis model of the beam was established. The calculated results are in good agreement with the experimental observations. It can provide reference for the application and design of recycled concrete beams strengthened with prestressed CFRP.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":"40 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139105479","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Alkali Activation of Common Clay Deposits: Evaluation of the Suitability by an IR Spectroscopic Method 普通粘土沉积物的碱活化：用红外光谱法评估适用性

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2024-01-02 DOI: 10.1186/s40069-023-00627-y

Felix Dathe, Frank Dehn

{"title":"Alkali Activation of Common Clay Deposits: Evaluation of the Suitability by an IR Spectroscopic Method","authors":"Felix Dathe, Frank Dehn","doi":"10.1186/s40069-023-00627-y","DOIUrl":"https://doi.org/10.1186/s40069-023-00627-y","url":null,"abstract":"In the context of a sustainable use of resources with the aim of the reduction of the CO2 footprint, the development of alternative concrete materials has attracted a great deal of attention. In this context, geopolymers, obtained from common clay deposits, are found to be interesting construction materials with very versatile properties. In this paper, a completely novel approach for the evaluation of the suitability of clays for the geopolymer formation is investigated. The method is based on simple and easy-to-handle IR spectroscopic measurements, through which the surface area under the OH stretching band in the IR spectrum of the clay can directly be correlated to the amount of reactive clay components. These reactive components are required for the success of the alkali activation of the clays in order to access geopolymers. Based on the theoretical reaction pathway of the geopolymer formation, the linear relationship between the OH stretching band area and the reactive components can be used for the estimation of the required activator amount for the alkali activation of calcined clays and predict the quality of the casted geopolymer mortar in terms of strength. This new method not only gives an insight into the suitability of a common clay for the geopolymer formation, but also facilitates a straightforward alkali activation procedure without tedious preliminary testing of the required activator amount.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":"11 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2024-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139077230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

An Adaptive Crack Width Prediction for Flexural Steel Reinforced UHPC Beams 挠性钢筋超高性能混凝土梁的自适应裂缝宽度预测

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-12-26 DOI: 10.1186/s40069-023-00628-x

Yanping Zhu, Yang Zhang, Xinzhe Yuan, Changgui Hou

{"title":"An Adaptive Crack Width Prediction for Flexural Steel Reinforced UHPC Beams","authors":"Yanping Zhu, Yang Zhang, Xinzhe Yuan, Changgui Hou","doi":"10.1186/s40069-023-00628-x","DOIUrl":"https://doi.org/10.1186/s40069-023-00628-x","url":null,"abstract":"The crack pattern of steel reinforced ultrahigh performance concrete (UHPC) beam is usually characterized by many densely distributed fine cracks (i.e., multiple microcracks) along with localized macrocrack, and the crack width development rate along the beam height is smaller than that of normal concrete since steel fibers and steel reinforcement bars are supposed to be effective in controlling crack width propagation of the UHPC beam. However, an effective crack width prediction formula is still underdeveloped for steel reinforced UHPC beam. The present study aims to formulate a crack width prediction equation based on the equations in Chinese code GB50010 where the parameters can be regressed and calibrated. Ten UHPC beams with different steel fiber volumes and reinforcing ratios are experimentally tested to collect crack width and spacing data for comparison and validation purposes. Nonuniformity distribution coefficient of rebar strain and average crack spacing are calibrated by the test data. Also, rebar stress is calculated with considering residual tensile strength of UHPC based on a sectional analysis. The modified crack width equation is validated with the test results, showing the best prediction accuracy of 0.97 and standard deviation of 0.11 for the test beams in this study compared to those predicted by JTG 3362, CECS 38, MC and AFGC. This study is emphasizing crack width prediction and control in designing UHPC structures.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":"35 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139056306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Slab Reinforcement Contributions to Negative Moment Strength of Reinforced Concrete T-Beam with High Strength Steel at Exterior Beam-Column Joints 钢筋混凝土 T 型梁外部梁柱连接处高强度钢的板加固对负弯矩强度的影响

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-12-22 DOI: 10.1186/s40069-023-00634-z

Zhamilya Mamesh, Dilnura Sailauova, Dichuan Zhang, H. Ju, Deuckhang Lee, Jong Kim

引用次数: 0

Mechanical Properties of Ultra-High Performance Concrete (UHPC) and Ultra-High Performance Fiber-Reinforced Concrete (UHPFRC) with Recycled Sand 使用再生砂的超高性能混凝土 (UHPC) 和超高性能纤维增强混凝土 (UHPFRC) 的力学性能

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-12-19 DOI: 10.1186/s40069-023-00631-2

Donguk Choi, Kyungchan Hong, Munkhtuvshin Ochirbud, Didar Meiramov, Piti Sukontaskuul

{"title":"Mechanical Properties of Ultra-High Performance Concrete (UHPC) and Ultra-High Performance Fiber-Reinforced Concrete (UHPFRC) with Recycled Sand","authors":"Donguk Choi, Kyungchan Hong, Munkhtuvshin Ochirbud, Didar Meiramov, Piti Sukontaskuul","doi":"10.1186/s40069-023-00631-2","DOIUrl":"https://doi.org/10.1186/s40069-023-00631-2","url":null,"abstract":"Use of high-cost raw materials such as quartz sand can limit wider application of ultra-high performance concrete in concrete construction. In this experimental study, recycled sand was used to fabricate ultra-high performance concrete (UHPC) and ultra-high performance fiber-reinforced concrete (UHPFRC). Green UHPC with ordinary Portland cement and industrial by-products such as silica fume, fly ash, as well as recycled sand was first developed through two-step packing density tests to optimize the mix design. UHPFRC was then developed based on the UHPC mix designs and by using 1%, 2%, or 3% 13-mm straight steel fibers (SSF). The compressive strength, elastic modulus, and flexural tensile strength was 128 MPa, 46.9 GPa, and 11.9 MPa, respectively, after 28 days at water-to-binder ratio of 0.17 and with 2% SSFs. All high-performance concretes in this work utilized 100% commercially available recycled sand that was produced by wet processing method. Mechanical characteristics such as strength, elastic modulus, and density, absorption, and voids of the UHPC/UHPFRC were investigated. Development of autogenous shrinkage of UHPC/UHPFRC with recycled sand was monitored for 12 weeks, while mercury intrusion porosimetry test and scanning electron microscopy were performed for microstructural investigation. Finally, the environmental impacts and economical aspects of the green UHPC were evaluated by life cycle assessment (LCA) and cost analysis.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":"9 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138744740","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Mechanical Properties of Concrete Produced with Coarse Aggregates from Different Mineralogical Origins Using Ultrasonic Tests 使用不同矿物质来源的粗骨料生产的混凝土的力学性能超声波测试

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-12-15 DOI: 10.1186/s40069-023-00630-3

Rodrigo Rogerio Cerqueira da Silva, Raquel Gonçalves, Cinthya Bertoldo

{"title":"Mechanical Properties of Concrete Produced with Coarse Aggregates from Different Mineralogical Origins Using Ultrasonic Tests","authors":"Rodrigo Rogerio Cerqueira da Silva, Raquel Gonçalves, Cinthya Bertoldo","doi":"10.1186/s40069-023-00630-3","DOIUrl":"https://doi.org/10.1186/s40069-023-00630-3","url":null,"abstract":"The use of nondestructive techniques in the technological control of concrete allows to evaluate and monitor the condition of the material without interfering with its properties; therefore, it is highly desirable in on-site inspections. Among these techniques, ultrasonic testing stands out as one of the most promising by its speed and simplicity to obtain results. However, inferences of strength and stiffness properties using ultrasound parameters should be made with caution, since many factors may interfere with wave propagation. This research aimed to evaluate the behavior of parameters obtained by ultrasonic testing (velocity of wave propagation [V] and stiffness coefficient [C = density × V2]) as predictors of the strength (fc) and stiffness (Eci) of concrete produced with coarse aggregates from different mineralogical origins. To achieve the objective, 128 specimens were produced with four aggregate mineralogical origins and four water-cement ratios, with 8 replications each. The ultrasonic tests were performed with two-frequency transducers (45 and 80 kHz). Prediction models of fc and Eci were statistically significant (P-value < 0,05) for both frequencies. The model using [C] as independent variable present better correlation with Eci (R2 > 91,2%) and with fc (R2 > 82%) than the model using only [V]. General regression models (regardless of the gravel type) were also statistically significant (P-value < 0.05), with R2 > 79% and prediction errors higher than those obtained for the specific models for different rock types.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":"3 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138685538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Thermal Cracking in High Volume of Fly Ash and GGBFS Concrete 大体积粉煤灰和 GGBFS 混凝土中的热裂缝

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-12-11 DOI: 10.1186/s40069-023-00626-z

Yingda Zhang

引用次数: 0

Experimental Investigation on the Properties of Sustainable Pervious Concrete with Different Aggregate Gradation 不同骨料级配的可持续透水混凝土性能实验研究

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-12-06 DOI: 10.1186/s40069-023-00625-0

Junyu Zhang, Haoran Sun, Xiaotian Shui, Wenxuan Chen

{"title":"Experimental Investigation on the Properties of Sustainable Pervious Concrete with Different Aggregate Gradation","authors":"Junyu Zhang, Haoran Sun, Xiaotian Shui, Wenxuan Chen","doi":"10.1186/s40069-023-00625-0","DOIUrl":"https://doi.org/10.1186/s40069-023-00625-0","url":null,"abstract":"Pervious concrete (PC) as a green infrastructure material has been increasingly used due to its positive environmental impacts, such as controlling storm water runoff, removing water pollutants and reducing heat island effect. The aggregate gradation is a critical factor influencing the physical properties of PC. Therefore, this paper represents an attempt to determine the effects of aggregate gradation on the various physical properties of PC, and then to explore relationships between them. To this end, three aggregate gradations 4.75–9.5 mm, 9.5–19 mm and 19–31.5 mm were recombined with various proportions (20–80%) to obtain five different gradations named as A, B, C, D and E. PC mixtures were prepared with these five aggregate gradations. Then, physical and mechanical properties of PC including porosity, permeability, compressive strength and water stability were investigated, according to the available specification. The results suggested that it was feasible to use waste concrete for permeable pavement, because all the specimens provided required specification requirements. Different linear relationships were also found between the maximum aggregate size and porosity, permeability coefficient, compressive strength and its loss rate. That is, porosity and permeability increased with the proportion of larger size aggregate increased, however, compressive strength reduced. Thus the compressive strength had an inverse correlation with the porosity and water permeability. Among five different aggregate gradations, group C (20% of 4.75–9.5 mm aggregate, 50% of 9.5–19 mm aggregate and 30% of 19–31.5 mm aggregate) can be seen as the optimum gradation and is suitable for base layer materials of permeable pavements.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":"108 1","pages":""},"PeriodicalIF":3.4,"publicationDate":"2023-12-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138548429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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