International Journal of Concrete Structures and Materials最新文献_第8页

Numerical and Experimental Behavior of Two-Story Confined Masonry Structure Subjected to Cyclic Loads 两层约束砌体结构在循环荷载作用下的数值与试验研究

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-29 DOI: 10.1186/s40069-023-00632-1

Mosaad El-Diasity, Sayed Salah, Mohamed O. R. El-Hariri, Amr A. Gamal, Tarik S. Elsalakawy

{"title":"Numerical and Experimental Behavior of Two-Story Confined Masonry Structure Subjected to Cyclic Loads","authors":"Mosaad El-Diasity, Sayed Salah, Mohamed O. R. El-Hariri, Amr A. Gamal, Tarik S. Elsalakawy","doi":"10.1186/s40069-023-00632-1","DOIUrl":"https://doi.org/10.1186/s40069-023-00632-1","url":null,"abstract":"<p>This research presents the numerical and experimental results of lateral cyclic loading applied on a two-story confined masonry structure utilizing local materials and standards. Two half-scale confined masonry structures were constructed using clay masonry units, confining columns, tie beams, and reinforced concrete slabs. The assemblies were tested up to failure using a displacement controlled loading methodology under vertical self-weight and lateral reversed cyclic loading. The walls of the assemblies have varying perforations (solid / windows / doors) to examine the influence of perforation on in-plane and out-of-plane performance. A strengthened assembly with an exterior layer of ferrocement has been used and this suggested upgrading approach enhanced the lateral resistance of the confined assembly by about (61–95%) while improving ductility and total energy absorbed by 27%. The maximum lateral drift at failure have been decreased to (23–31%), however the corresponding load for the first visible fracture have been raised by (150–175%). Furthermore, total failure has been delayed for the strengthened walls (all sides, particularly the perforated sides). Comparing distorted forms, fracture patterns, and capacity curves of finite element models included in this research yielded excellent agreement.</p>","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"138537175","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

Machine Learning Based Reactivity Prediction of Fly Ash Type F Produced from South Korea 基于机器学习的韩国 F 型粉煤灰反应性预测

IF 3.4 3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-22 DOI: 10.1186/s40069-023-00622-3

Woo-Young Park, Juhyuk Moon

引用次数: 0

Damage and Deterioration Mechanism of Coal Gangue Mixed Pumice Aggregate Concrete Under Freeze–Thaw Cycles 冻融循环作用下煤矸石混合浮石骨料混凝土损伤劣化机理

3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-15 DOI: 10.1186/s40069-023-00619-y

Wen Li, Hailong Wang, Wenyan Zhang

{"title":"Damage and Deterioration Mechanism of Coal Gangue Mixed Pumice Aggregate Concrete Under Freeze–Thaw Cycles","authors":"Wen Li, Hailong Wang, Wenyan Zhang","doi":"10.1186/s40069-023-00619-y","DOIUrl":"https://doi.org/10.1186/s40069-023-00619-y","url":null,"abstract":"Abstract The world is facing the problem of depletion of natural sand and gravel resources, and a large amount of coal gangue solid waste is produced in Inner Mongolia, China, which has low utilization rate and causes ecological pollution. In order to improve the gangue in the mining infrastructure construction of a wide range of application prospects, the use of coal gangue as the coarse aggregate of pumice concrete is of great significance. Inner Mongolia is a cold region, and gangue mixed aggregate concrete (MFC) will certainly face the damage caused by freeze–thaw cycles. Therefore, design gangue by different volume replacement rate (0%, 20%, 40%, 60%, 80%, 100%) to replace pumice coarse aggregate. The results show that with the increase of gangue substitution rate, the mass loss rate, relative dynamic elastic modulus, and peak stress of MFC decrease, but the trend of peak strain increases. It is mainly attributed to the less Al 2 O 3 and SiO 2 content of gangue, which makes the MFC hydration products decrease with the increase of substitution rate and more original microcracks and pores in the specimens. In addition, the damage model of MFC was established by using Weibull statistical distribution theory and the principle of LEMAITRE equivalent effect variation assumption, and the damage evolution characteristics were explored by combining the experimental results. It can provide the theoretical basis for the application of MFC in cold regions.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136229228","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

Experimental and Analytical Investigation of Fracture Characteristics of Steel Fiber-Reinforced Recycled Aggregate Concrete 钢纤维增强再生骨料混凝土断裂特性试验与分析研究

3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-13 DOI: 10.1186/s40069-023-00637-w

Ahmed M. Maglad, Walid Mansour, Bassam A. Tayeh, Mohamed Elmasry, Ahmed M. Yosri, Sabry Fayed

{"title":"Experimental and Analytical Investigation of Fracture Characteristics of Steel Fiber-Reinforced Recycled Aggregate Concrete","authors":"Ahmed M. Maglad, Walid Mansour, Bassam A. Tayeh, Mohamed Elmasry, Ahmed M. Yosri, Sabry Fayed","doi":"10.1186/s40069-023-00637-w","DOIUrl":"https://doi.org/10.1186/s40069-023-00637-w","url":null,"abstract":"Abstract Fracture parameters of fiber concrete (FC) are currently a hot research area. Fracture mechanics is the field of solid mechanics that helps to study the type and propagation of cracks in materials. It uses methods of calculating the driving force on a crack and characterizes the material's resistance to fracture. Behavioral characteristics are determined by crack mouth opening displacement and the load–deflection method. This research identifies the fracture parameters of 33 notched simply supported beams made by recycled aggregate cement concrete with steel fiber. The recycled aggregate ratio in concrete has been altered to determine the effect on the mechanical and fracture properties. For determining fracture parameters, a 3-point bending single-edge notched fracture test was used. The results indicated that the steel fiber-reinforced concrete made with recycled aggregate showed similar performance and fracture characteristics compared to normal concrete. Thus, adding steel fibers to various concrete mixes considerably improved the fracture characteristics, while the brittleness was reduced with increased steel fiber content. Linear regression analysis also showed the accuracy of mechanical strength results as the value of R-square was close to unity. Displacement, ultimate load, brittleness (B), fracture toughness ( K IC ), crack mouth opening displacement (CMOD), fracture energy ( G F ), modulus of elasticity ( E ), and characteristic length ( l ch ), were determined for both conventional and recycled aggregate specimens. The “work of fracture\"—by definition the formula—is the most reliable to calculate the fracture energy as the nonlinearity is related to the performance of FC.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136281870","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

Analysis of Mechanical Properties and Microstructure of Nano- and Micro-SiO2 Materials as Cementitious Composite Binder 纳米和微sio2材料作为胶凝复合粘结剂的力学性能和微观结构分析

3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-11 DOI: 10.1186/s40069-023-00629-w

Won-Woo Kim, Jae-Heum Moon

{"title":"Analysis of Mechanical Properties and Microstructure of Nano- and Micro-SiO2 Materials as Cementitious Composite Binder","authors":"Won-Woo Kim, Jae-Heum Moon","doi":"10.1186/s40069-023-00629-w","DOIUrl":"https://doi.org/10.1186/s40069-023-00629-w","url":null,"abstract":"Abstract This study evaluated the setting time, mechanical properties and microstructure of Portland cement (OPC) by adding SiO 2 nano- and micro-particles. The setting time was reduced due to the pozzolanic reaction of the nano- and micro-SiO 2 , and the compressive strength was increased through a reduction in the porosity of the microstructure. When nano- and micro-SiO 2 were used alone, micro-silica was the most effective in reduced the initial and final setting times and developing compressive strength. When two or more nano- and micro-SiO 2 were used, a micro-sized binder and a small amount of nano-silica effectively improved performance as the setting time was reduced to 50–52% of that of ordinary Portland cement (OPC). It appears that a small amount of nano-silica could reduce the setting time and increase compressive strength because it caused the pozzolanic reaction and because the nanoparticles filled the pores between the silica fume and cement, which were composed of relatively large particles. This result could also be derived from compressive strength and microstructure analysis. Cement paste containing to nano- and micro-silica increased the strength by approximately 112% compared to OPC. Because nano-binders may cause a reduction in flow due to their large specific surface area, adding chemical admixture needs to be considered during mix design. In addition, the particle size distribution must be considered when nano- and micro-materials are used because an imbalance in particle size distribution can increase the pore size in the microstructure.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135043148","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

Experimental Study on Structural Performance of Cast-in-Place Frame Printed Concrete Wall 现浇框架印花混凝土墙结构性能试验研究

3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-08 DOI: 10.1186/s40069-023-00620-5

Yanan Fu, Ying Zhang, Lei Wu

{"title":"Experimental Study on Structural Performance of Cast-in-Place Frame Printed Concrete Wall","authors":"Yanan Fu, Ying Zhang, Lei Wu","doi":"10.1186/s40069-023-00620-5","DOIUrl":"https://doi.org/10.1186/s40069-023-00620-5","url":null,"abstract":"Abstract A growing number of nations and regions have printed concrete structures thanks to the application of 3D printing technology in the field of civil engineering. However, the houses built with printed concrete are mostly printed concrete wall structures with composite load-bearing walls and cast-in-place frames. This structure solely takes into account the performance of the structure under vertical loads, which does not address its ability to withstand horizontal loads. In this paper, wall specimens were designed and tested under horizontal reciprocal loads in order to investigate the structural performance of this cast-in-place border-frame printed concrete wall structure under horizontal loads. Four factors are examined in order to determine how well the cast-in-place frame printed concrete wall structure performs when subjected to horizontal loads: column longitudinal reinforcement strain, hysteresis curve, skeleton curve, and energy dissipation capacity. According to the test results, the addition of the wall increased the bearing capacity and accumulated energy dissipation of the specimen, but the increase in stiffness also caused the structural ductility to decrease. As a result, cracks were more likely to generate at the wall–column joints, so the stiffness matching between the printed concrete wall and the cast-in-place side frame needed to be further coordinated to obtain a higher ductility. It turns out that the wall sections have little impact on the seismic performance of the members.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135340935","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

Experimental Study of the Effect of Different Insulation Schemes on Fire Performance of FRP Strengthened Concrete: FIRECOAT and REALROCK 不同保温方案对FRP增强混凝土防火性能影响的试验研究:防火涂料和REALROCK

3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-05 DOI: 10.1186/s40069-023-00604-5

Ahmet Can Altunişik, Yunus Emrahan Akbulut, Süleyman Adanur, Murat Günaydin, Sara Mostofi, Ayman Mosallam

{"title":"Experimental Study of the Effect of Different Insulation Schemes on Fire Performance of FRP Strengthened Concrete: FIRECOAT and REALROCK","authors":"Ahmet Can Altunişik, Yunus Emrahan Akbulut, Süleyman Adanur, Murat Günaydin, Sara Mostofi, Ayman Mosallam","doi":"10.1186/s40069-023-00604-5","DOIUrl":"https://doi.org/10.1186/s40069-023-00604-5","url":null,"abstract":"Abstract The past two decades have witnessed rapid advances in the use of fiber-reinforced polymer (FRP) composites in different engineering fields. Advantages such as high strength-to-weight ratio, corrosion resistance, and tailority have led to immense interest in the use of FRPs in wide spectrum repair and strengthening of structures. Despite their many advantages, FRPs are highly sensitive to high temperatures, which pose a major concern for fire potential structures such as buildings. Applying proper thermal insulation can enhance the fire performance of FRP and reduce the possible fire damage to the FRP strengthened element. This study set out to experimentally investigate the effectiveness of two insulation systems, “FIRECOAT” and “REALROCK” on fire performance of CFRP and GFRP strengthened concrete specimens. Various configurations and exposure durations were considered to evaluate the effectiveness of insulating materials. To perform the experiments, cylindrical concrete specimens were fabricated and strengthened using CFRP or GFRP. After insulating the specimens, they were exposed to a standard fire curve for two different durations of 30 and 60 min. The results indicate that less than 30 min of fire, both insulation systems can provide the required protection. During long exposure duration of 60 min, only REALROCK can provide the required thermal resistance for FRP-strengthened concrete. Within the tested materials, Fire Set 60 outperformed other insulating materials. It was observed that implementing Fire Set 60 in the innermost layer of thermal insulations has crucial importance in preventing the fire induced reductions in strength of FRP-strengthened concrete elements.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135724529","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 Flexural and Shear Behavior of UHPC Rhombus-Strip-Shaped Joint UHPC菱形条形节点抗弯抗剪性能研究

3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-03 DOI: 10.1186/s40069-023-00642-z

Shuwen Deng, Banfu Yan, Lian Shen, Mingxin Qin, Yina Jia

引用次数: 0

Correction: Experimental research on seismic performance of masonry-infilled RC frames retrofitted by using fabric-reinforced cementitious matrix under in-plane cyclic loading 修正:面内循环荷载作用下纤维增强水泥基加固混凝土砌体框架抗震性能试验研究

3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-01 DOI: 10.1186/s40069-023-00618-z

Fayu Wang

引用次数: 0

A Study on the Flexural Performance of Para-aramid Fiber Reinforced Concrete Beams with Recycled Coarse Aggregates 再生粗骨料对芳纶纤维混凝土梁抗弯性能研究

3区工程技术

International Journal of Concrete Structures and Materials Pub Date : 2023-11-01 DOI: 10.1186/s40069-023-00623-2

Jamshid Ruziev, Woosuk Kim

{"title":"A Study on the Flexural Performance of Para-aramid Fiber Reinforced Concrete Beams with Recycled Coarse Aggregates","authors":"Jamshid Ruziev, Woosuk Kim","doi":"10.1186/s40069-023-00623-2","DOIUrl":"https://doi.org/10.1186/s40069-023-00623-2","url":null,"abstract":"Abstract This study aims to investigate the effectiveness of para-aramid fiber sheet in enhancing the flexural performance of reinforced concrete (RC) beams made with Environmental-Friendly Recycled Coarse Aggregates. The experimental program examines the effect of substitution ratio of recycled aggregates (0%, 30%, and 50%), type of para-aramid fiber sheet (KN 206 RFL and KN AA070-RFL), and the method of fiber sheet attachment (bottom and bottom-side). The test results show that the ultimate load-carrying capacity of RC beams reinforced with para-aramid fiber sheet attached to the bottom and side parts increased by 23.9% compared to the unreinforced specimens. The main findings of the study include the identification of the BU-type attachment method as the most effective method for enhancing the flexural performance of reinforced concrete beams. The comparison of the experimental results with analytical predictions showed that the nominal flexural strength obtained from the experimental study was lower than the analytical predictions, but the ductile capacity of the specimens indicated the effectiveness of para-aramid fiber sheet reinforcement in EFRCA RC beams for flexural strength. The study highlights the potential of using para-aramid fiber sheet in improving the flexural behavior of RC beams made with recycled aggregates, offering a sustainable solution for the construction industry.","PeriodicalId":13832,"journal":{"name":"International Journal of Concrete Structures and Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135216204","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