Revista de la Construccion最新文献_第8页

Selection of insulation materials with PSI-CRITIC based CoCoSo method 基于PSI-CRITIC的CoCoSo方法选择绝缘材料

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.382

A. Ulutaş, F. Balo, L. Sua, D. Karabašević, D. Stanujkić, G. Popović

{"title":"Selection of insulation materials with PSI-CRITIC based CoCoSo method","authors":"A. Ulutaş, F. Balo, L. Sua, D. Karabašević, D. Stanujkić, G. Popović","doi":"10.7764/rdlc.20.2.382","DOIUrl":"https://doi.org/10.7764/rdlc.20.2.382","url":null,"abstract":"The performance effect of construction on energy conservation substantially depends upon application of correct materials and energy saving methodologies. A sizable financial impact is accomplished through insulated walls. The criteria explaining the present wall insulating material options may have different values. Furthermore, they may alter in different aspects, i.e. higher values of certain criteria show a preferable status, while for others they denote an inferior status. In this framework, a variant of compromise is needed, which can be situated through multi-criteria assessment methodologies. To diminish the effect of different methodologies on computational results, few diverse techniques can be considered, with descriptions of the mean predicted values. Thus, drawbacks of certain multi-criteria assessment techniques could be compensated through others. A hybrid methodology through the combination of individual techniques will be accurate if there is a relationship between the values determined through diverse methodologies. In this study, the most efficient insulation material used at external walls is selected by using PSI-CRITIC based CoCoSo Method. The analytical results are important both from financial and engineering point of views as the applied methodology is commercially viable and practically implementable. Precise and up-to-date material properties are derived from the leading companies in the sector.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49185706","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: 3

Influences of high temperature on mechanical properties of fly ash based geopolymer mortars reinforced with PVA fiber 高温对PVA纤维增强粉煤灰基地质聚合物砂浆力学性能的影响

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.393

M. Kaya, F. Koksal

{"title":"Influences of high temperature on mechanical properties of fly ash based geopolymer mortars reinforced with PVA fiber","authors":"M. Kaya, F. Koksal","doi":"10.7764/rdlc.20.2.393","DOIUrl":"https://doi.org/10.7764/rdlc.20.2.393","url":null,"abstract":"In this study, a geopolymer composite containing PVA fiber was produced to recycle waste fly ash and obtain an eco-friendly binder. Mechanical properties of geopolymer mortars, produced by using F class fly ash which was activated with NaOH (sodium hydroxide), and reinforced by PVA (polyvinyl alcohol) fiber were investigated after high temperature effect. Geopolymer mortar samples produced by mixing with fly ash, sand, water and NaOH were placed in standard molds of 40×40×160 mm3. PVA fibers were used at percentages of 0,5%, 1% and 1,5% by volume in the experiment. Tests were performed on mortars exposed to high temperatures of 200°C, 400°C, 600°C and 800°C for physical and mechanical properties. For the specimens not subjected to high temperatures, an increase in the compressive strength of mortars containing PVA fibers was observed in comparison to mortar without PVA fiber. On the other hand, it was concluded that losses in compressive strength were less for mortar without PVA fiber when compared with the mortars containing PVA fibers. As a result of the modeling, the PVA ratio, which gives the optimum flexural and compressive strength, was determined as 1,47%. As a result of melting of PVA fibers under the effect of high temperature, 83,58% loss of compressive strength was determined in samples containing 1,5% PVA after 800ºC temperature.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43116996","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: 9

Strength and durability of roller compacted concrete with different types and addition rates of polypropylene fibers 不同聚丙烯纤维种类和掺量的碾压混凝土的强度和耐久性

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.205

I. Kilic, Saadet Gökçe Gök

{"title":"Strength and durability of roller compacted concrete with different types and addition rates of polypropylene fibers","authors":"I. Kilic, Saadet Gökçe Gök","doi":"10.7764/rdlc.20.2.205","DOIUrl":"https://doi.org/10.7764/rdlc.20.2.205","url":null,"abstract":"Roller compacted concrete (RCC) is a relatively new alternative construction material that can be used in road and dam constructions by allowing rapid use after production and the use of conventional building materials in production. RCC, which can be produced with low water/cement ratio, is one of the rigid road pavement types and shows similarity to flexible road pavements with the production technique. Different types of fibers such as steel and polypropylene (PP) are used in concrete roads with the aim of preventing cracks, reducing the pavement thickness and increasing the permissible joint gap. In this study, flexural strength, compressive strength, unit weight, water absorption, ultrasonic pulse velocity, modulus of elasticity and freeze-thaw resistance were determined in roller compacted concretes produced by using two different polypropylene-based fibers. In RCC design, fiber addition was insufficient to improve concrete properties in terms of strength and durability. It has been observed that there was a 14.4% reduction in compressive strength with 0.20% fiber inclusion, and a 46.8% reduction in compressive strength with 0.50% fiber inclusion. Polypropylene fiber inclusion increased the water absorption percentages and decreased the specific weights of fiber reinforced roller compacted concretes. However, roller compacted concretes produced with PP-fiber exhibited a good performance under freeze-thaw attack.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44629188","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: 1

Dynamic responses of reinforced concrete slabs under sudden impact loading 钢筋混凝土板在冲击荷载作用下的动力响应

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.346

R. T. Erdem

{"title":"Dynamic responses of reinforced concrete slabs under sudden impact loading","authors":"R. T. Erdem","doi":"10.7764/rdlc.20.2.346","DOIUrl":"https://doi.org/10.7764/rdlc.20.2.346","url":null,"abstract":"Reinforced concrete (RC) slabs may be subjected to low-velocity impact effect in their service lives. In this study, it is aimed to investigate dynamic responses of two-way rc slabs. So, a total of 6 slabs with 500x500, 550x550 and 600x600 mm side lengths and having same thickness are both experimentally and numerically investigated under low velocity impact loading. Two different reinforcement configurations are used in the production of each slab. A drop test setup is designed for the experimental study. Besides, measurement devices such as accelerometer, lvdt, dynamic load cell, data logger and optic photocells are used in the experimental program. Experiments on the specimens are carried out for the same level of impact energy. Acceleration, displacement and impact load values of slabs are presented by time dependent graphs. In addition, cracks and deformations are observed during tests. In the numerical part of this study, a detailed finite element procedure where explicit dynamic analysis is performed by Abaqus finite elements software is established. The simulations are performed for each test specimen under impact effect and analysis results are used in the verification of experimental results. The relationship between experimental and numerical studies is comparatively examined in terms of crack patterns and average ratios of accelerations, displacements, impact loads. Finally, it is considered that the proposed numerical model could be used in the evaluation of experimental results under impact loading.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49279079","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: 5

Frictional properties between geocells filled with granular material 填充颗粒材料的土工单元之间的摩擦特性

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.332

G. Altay, C. Kayadelen, T. Taskiran, B. Baǧrıaçık, Okkes Toprak

引用次数: 2

Properties of concrete having treated recycled coarse aggregate and slag 处理过再生粗骨料和矿渣的混凝土性能

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.249

P. Saravanakumar, D. Manoj, S. Jagan, Anand Nagar Krishnankoil Education

引用次数: 4

An investigation of concrete stress-strain behavior by the image analysis method 用图像分析方法研究混凝土应力-应变特性

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.308

Mahfuz Pekgöz, O. Günaydın

{"title":"An investigation of concrete stress-strain behavior by the image analysis method","authors":"Mahfuz Pekgöz, O. Günaydın","doi":"10.7764/rdlc.20.2.308","DOIUrl":"https://doi.org/10.7764/rdlc.20.2.308","url":null,"abstract":"Concrete is a composite load-bearing building material. The deformation behavior of load-bearing materials under load is vital for the building system. Investigation of these brittle and quasi-brittle behavior patterns at various load levels provides an advantage in the evaluation of mechanical properties. In this study, the deformations occurring within the concrete samples in different stress-strain regions were investigated using an image analysis technique. The experimental samples experienced elastic-limit loading for two hours to clearly monitor the deformations at elastic, plastic, and breaking points. For the microstructure studies, the samples were prepared with epoxy for image analysis. Thin-sections were taken from each series of epoxy-impregnated concrete test samples, examined under a microscope, and photographed. Deformation studies on the digital photographs were carried out by the image analysis method. The results show that crack formation and crack types change because of increased stress and deformations. Crack formations within the concrete are parallel to the loading direction and occurred mainly in the aggregate–cement-paste interface. At 85% of the ultimate stress, crack length was measured as 0.665-29.505 mm and crack width 0.180-4.128 mm, while the crack length was 0.305-32.688 mm and crack width were 0.106-2.906 mm at fracture stress.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44587461","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

Mechanical and durability properties of the concrete with copper slag 掺铜渣混凝土的力学性能和耐久性

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.359

S. Jagan, Anand Nagar Krishnankoil Education, T. Neelakantan, R. Kannan

{"title":"Mechanical and durability properties of the concrete with copper slag","authors":"S. Jagan, Anand Nagar Krishnankoil Education, T. Neelakantan, R. Kannan","doi":"10.7764/rdlc.20.2.359","DOIUrl":"https://doi.org/10.7764/rdlc.20.2.359","url":null,"abstract":"Increased development in the field of construction with the use of sand, stones etc. depletes the natural resources and thus resulted in the scarcity of construction materials. Furthermore, generation of waste from several industries such as steel slag, copper slag, blast furnace slag etc. are being dumped in the nearby landfills leading to disposal problems. The scarcity of construction materials necessitated the utilization of suitable alternative materials with equivalent physical and chemical characteristics. This paper investigates the suitability of copper slag (CS) as a substitute to natural fine aggregate (NFA) in the concrete. The concrete mixes are prepared with 0%, 10%, 30%, 50%, 70% and 100% of copper slag at 0.45 w/c ratio. The behaviour of CS in the concrete was assessed by hardened properties such as compression, tension and flexure at 7, 14, 28 and 90 days and durability properties such as water absorption, porosity and chloride ion penetration at 56 days. Results indicate that the replacement of CS beyond 50% affects properties of the concrete; however increased curing improved the properties of the concrete at higher replacement levels. Characterization studies such as XRD and SEM was performed to examine the effect of CS on the properties of the concrete.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45052302","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: 2

Classification and resolution procedure for disputes in public construction projects 公共建设工程纠纷分类及解决程序

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.259

B. Sayın, Mahmut Sari, Cemil Akcay

{"title":"Classification and resolution procedure for disputes in public construction projects","authors":"B. Sayın, Mahmut Sari, Cemil Akcay","doi":"10.7764/rdlc.20.2.259","DOIUrl":"https://doi.org/10.7764/rdlc.20.2.259","url":null,"abstract":"Construction sector, which is associated with approximately two hundred sub-sectors in terms of employment area, plays the role of locomotive sector in economic development of countries. This feature of the sector affects economy directly and indirectly. Despite this positive contribution of the sector, disputes are inevitable between parties –administration and contractor– in a bid, contract and implementation processes, which are parameters of the construction process. Formal judicial process applied for the purpose of resolving disputes encountered in construction projects that the public assumes the role of employer, takes a long time. Therefore, while contractor is exposed to financial losses, administration cannot conclude public investment. In the study; disputes in public construction projects are classified, and proposals preventing disputes are presented. In this scope, firstly, 174 of 10591 disputes submitted to Court of Cassation, and 84 of 102 disputes submitted to Directorate of High Technics Board are selected regarding public construction projects. In the second stage, parameters causing disputes are classified under six main items. Thirdly, reasons of the disputes for each classification are detailed, and then proposals are presented for prevention of the disputes based on FIDIC (International Federation of Consulting Engineers) contract forms. Finally, a resolution procedure is developed for the processes including bid, contract and implementation phases based on FIDIC. By the presented proposals for GCCW (General conditions of construction works) official resolution paths can be reduced to a minimum, and the processes result positively for administration and contractors. It is concluded that the developed procedure is suitable as a practical tool for resolution process of the disputes in the public construction projects.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43828874","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: 1

Effects of mortar compressive strength on out of plane response of unreinforced masonry walls 砂浆抗压强度对无筋砌体墙体面外响应的影响

IF 1.4 4区工程技术

Revista de la Construccion Pub Date : 2021-08-01 DOI: 10.7764/rdlc.20.2.371

Atabak Pourmohammad Sorkhab, Mesut Küçük, A. Sarı

{"title":"Effects of mortar compressive strength on out of plane response of unreinforced masonry walls","authors":"Atabak Pourmohammad Sorkhab, Mesut Küçük, A. Sarı","doi":"10.7764/rdlc.20.2.371","DOIUrl":"https://doi.org/10.7764/rdlc.20.2.371","url":null,"abstract":"In this study, the out-of-plane response of infill walls that are widely used in Turkey and the surrounding regions were experimentally investigated. Several out-of-plane wall tests were performed in the laboratory, with the walls specimens produced with lateral hollow clay bricks (LHCB) and different mortar qualities. The walls were tested in their out-of-plane (OOP) direction under static load conditions and evaluated based on the load-bearing and energy dissipation capacities, crack propagations, mortar strengths, and initial stiffnesses. These walls are experimentally investigated to understand the effects of the mortar strength on the infill wall structural behaviors and to assess the effectiveness of the out-of-plane strength formulations. It was found that when the mortar strength is low, the first major crack occurs at the mortar, however, because of the arch mechanism efficiency in this situation the OOP load-carrying and energy dissipation capacities of unreinforced walls can be significantly increased. When the first major crack in the wall occurs in the brick itself, the arc mechanism is provided with delicate sections in the brick, which leads to strength decreasing in the walls. In this case, excessive deviations occur in the out-of-plane strength formulations estimates. This study shows that the arc mechanism, the damage start region and progress can change significantly unreinforced masonry (URM) infill walls behaviors.","PeriodicalId":54473,"journal":{"name":"Revista de la Construccion","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47816511","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