Materiali in tehnologije最新文献

EFFICIENT WASTEWATER TREATMENT THROUGH INTEGRATED WATER HYACINTH SYSTEMS: ADVANCES AND APPLICATIONS IN CONCRETE 通过综合水葫芦系统高效处理废水：混凝土的进展与应用

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.914

Ananthakumar Ayyadurai, M. M. Saravanan, M. Devi

{"title":"EFFICIENT WASTEWATER TREATMENT THROUGH INTEGRATED WATER HYACINTH SYSTEMS: ADVANCES AND APPLICATIONS IN CONCRETE","authors":"Ananthakumar Ayyadurai, M. M. Saravanan, M. Devi","doi":"10.17222/mit.2023.914","DOIUrl":"https://doi.org/10.17222/mit.2023.914","url":null,"abstract":"This research focuses on enhancing water quality for concrete construction by utilizing treated wastewater from wetlands. The study employs a dual-stage treatment process involving charcoal and aggregate layers for primary treatment, followed by water hyacinths for secondary treatment. Investigating water hyacinths’ ability to absorb nutrients and contaminants from wastewater is a unique aspect of the study, offering a potential solution for soil and water remediation. Water hyacinths, especially stems and leaves, act as natural filters, effectively indicating heavy-metal pollution in tropical regions. The primary goal is heavy-metal removal from wastewater, allowing treated-water use in concrete production at varying proportions (20 %, 40 %, 60 %, 80 %, and 100 %). Silica fume at 15 % concentration is incorporated to enhance the concrete’s durability. Concrete specimens undergo thorough preparation and mechanical property evaluations, compared to conventional M20-grade concrete. The results reveal improvements in mechanical properties, particularly with 80 % treated wastewater in the mix. The dual-stage treatment process removes heavy metals, and the inclusion of silica fume enhances the concrete’s durability and resistance.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140749238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

INFLUENCE OF SPRAY DISTANCE ON THE POROSITY OF Ni-BASED AMORPHOUS COATINGS: NUMERICAL SIMULATION AND EXPERIMENT 喷涂距离对镍基憎水涂层孔隙率的影响：数值模拟与实验

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.1002

Rui Wang, Deming Wang, Nianchu Wu

引用次数: 0

EXPERIMENTAL STUDY OF THE CHLORIDE-ION PERMEABILITY OF BAMBOO-FIBER-REINFORCED CONCRETE 竹纤维加固混凝土氯离子渗透性实验研究

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.1049

Yong Luo, Mustafasanie M. Yussof, Yiming Jiang, Zhongwei Peng, Chaoxing Wu, Fangcheng Shi, Yuepeng Chen

{"title":"EXPERIMENTAL STUDY OF THE CHLORIDE-ION PERMEABILITY OF BAMBOO-FIBER-REINFORCED CONCRETE","authors":"Yong Luo, Mustafasanie M. Yussof, Yiming Jiang, Zhongwei Peng, Chaoxing Wu, Fangcheng Shi, Yuepeng Chen","doi":"10.17222/mit.2023.1049","DOIUrl":"https://doi.org/10.17222/mit.2023.1049","url":null,"abstract":"This study investigated the chloride-ion permeability of C30 concrete by adding bamboo fibers with different treatments (untreated, treated with calcium hydroxide solution and treated with sodium hydroxide solution) and different dosages. Three testing methods, namely the electric-flux method, AC test method and the RCM method, were used to characterize the concrete. Parameters such as electric-flux value, AC resistivity and chloride-ion diffusion coefficient were obtained. Results showed that the surface impurities of the bamboo fibers treated with calcium hydroxide solution were removed and the thermal stability of the bamboo fibers was improved, which can effectively enhance the chloride-ion permeability of concrete. Compared to untreated bamboo fibers, the improvement rate was between 14 % and 17 %. Sodium hydroxide is a strong alkaline solution, which can easily disrupt the structure of bamboo fibers and reduce the resistance of concrete to chloride-ion penetration. The best chloride-ion permeability was achieved when the bamboo fiber content reached 2 %. The electric-flux method, AC test method, and the RCM method were mutually validated with good correlation. It is recommended to choose a suitable and simple method for testing. Bamboo-fiber concrete lays a solid foundation for the future transformation of the civil-engineering industry.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140749608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","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 HIGH-INTENSITY ULTRASONIC TREATMENT ON REFINEMENT OF Al-5Cu ALLOY INGOTS 高强度超音速处理对 Al-5Cu 合金铸锭精炼的影响

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.1038

Z. Jia, Zhi Zhuo Wang, L. Fu

引用次数: 0

INVESTIGATION OF MECHANICAL AND PHYSICAL PROPERTIES OF DATE PALM STEM FIBRE REINFORCED EPOXY COMPOSITES 枣椰茎纤维增强环氧树脂复合材料的机械和物理性能研究

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.1033

Mathu Kumar S., Rejikumar R., Mini Jose Anand, Mohamed Shebu M.

{"title":"INVESTIGATION OF MECHANICAL AND PHYSICAL PROPERTIES OF DATE PALM STEM FIBRE REINFORCED EPOXY COMPOSITES","authors":"Mathu Kumar S., Rejikumar R., Mini Jose Anand, Mohamed Shebu M.","doi":"10.17222/mit.2023.1033","DOIUrl":"https://doi.org/10.17222/mit.2023.1033","url":null,"abstract":"The growing demand for sustainable materials, particularly date palm stem fibre (DPSF), has garnered attention in the area of engineering applications due to its advantageous traits. Its composites offer distinctive characteristics such as satisfactory mechanical properties, low density and a cost-effective production. This study examines the mechanical characteristics of epoxy (LY-556) composites reinforced with DPSF. A range of composite configurations with different compositions and fibre loadings were meticulously crafted, using a hand lay-up technique. The research meticulously examines DPSF and epoxy composites with loadings of (10, 15, 20, and 25) w/%, comprehensively characterizing their flexural, tensile, impact and water-absorption behaviours. Across the varied compositions, the characteristics of flexural strength, tensile strength, impact strength and water absorption are thoroughly analysed. The conclusive findings underscore optimal enhancements in the flexural, tensile and impact strengths achieved with the DPSF loading of 20 %. This empirical understanding bears significance for designing natural fibre reinforced composites with superior mechanical attributes, reaffirming DPSF’s potential as a valuable reinforcement in modern engineering applications.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140747581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

THREE-DIMENSIONAL MODEL OF EQUIVALENT ROLL GAP OF CVC MILL UNDER CONDITIONS OF ROLL CROSSING AND NO LOAD 轧辊交叉和空载条件下 cvc 轧机等效轧辊间隙的三维模型

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.1047

Xiaoxin Ma, Peisen Yuan, Fuyi Li, Jiang Ji

{"title":"THREE-DIMENSIONAL MODEL OF EQUIVALENT ROLL GAP OF CVC MILL UNDER CONDITIONS OF ROLL CROSSING AND NO LOAD","authors":"Xiaoxin Ma, Peisen Yuan, Fuyi Li, Jiang Ji","doi":"10.17222/mit.2023.1047","DOIUrl":"https://doi.org/10.17222/mit.2023.1047","url":null,"abstract":"Traditional roll technologies focus solely on the contour of the roll gap at the outlet under ideal conditions. However, upon roll crossing, the three-dimensional distribution of the deformation zone becomes asymmetrical, leading to an adverse impact on the rolling pressure in the deformation zone. To study the screw-down load deviation of plate mills, it is necessary to accurately calculate the equivalent three-dimensional roll gap in the deformation zone under roll-crossing conditions. In this paper a model for calculating the equivalent three-dimensional roll gap under the conditions of roll crossing and no load was established based on the method of the coordinate nonlinear transformation of the spatial rectangular coordinate system. Based on this model, the influences of roll-crossing angles and translation parameters on the symmetry of the equivalent three-dimensional roll gap were analyzed. The distribution of the three-dimensional equivalent roll gap was calculated with different roll lengths, roll radii, and the roll gap’s nominal thickness. The intuitive contour map reveals that under the same condition of crossing angle and translation parameters, the larger the roll length and roll radii and the smaller the roll gap’s nominal thickness are, the greater the influence of the roll crossing on the asymmetrical distribution of roll gap is. It put forward a quantitative calculation method for evaluating the symmetrical distribution of the roll gap, and the calculation results can provide the equivalent roll profile for the roll-deformation model.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140748689","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","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 CYCLIC NaCl SOLUTION IMMERSION CURING ON THE MECHANICAL PROPERTIES OF PLAIN CONCRETE 氯化钠溶液循环浸泡固化对普通混凝土力学性能的影响

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.794

Weisheng He, Shoujun Wu, Bo Zhang, Yiming Luo, Yanyu Liu, Guo Fu

引用次数: 0

EFFICIENT PRODUCTION OF SMALL-SIZED SiO2 NANOPARTICLES AND THEIR APPLICATION IN A WATERBORNE ACRYLIC-AMINO VARNISH 高效生产小尺寸二氧化硅纳米颗粒及其在水性丙烯酸-氨基涂料中的应用

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.905

Jinping Wu, Jinxiang Mao, Hong Liu, Xichuan Cao, Minmin Chen

引用次数: 0

EXPERIMENTAL STUDY ON MAG WELDED E350 HSLA STEEL JOINTS E350 HSLA 钢磁性焊接接头的实验研究

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2023.1062

Bradeesh Moorthy S., Malayalamurthy R., Amirthagadeswaran K. S.

{"title":"EXPERIMENTAL STUDY ON MAG WELDED E350 HSLA STEEL JOINTS","authors":"Bradeesh Moorthy S., Malayalamurthy R., Amirthagadeswaran K. S.","doi":"10.17222/mit.2023.1062","DOIUrl":"https://doi.org/10.17222/mit.2023.1062","url":null,"abstract":"Activated flux has been used successfully to improve the penetration of Tungsten Inert-Gas (TIG) welding, which is normally a welding process with low penetration. But the same activated flux when used for Metal Active Gas (MAG) welding showed a moderate improvement in penetration. Hence only a few research articles reported on activated flux MAG welding. TIG dressing is a post-weld treatment intended to improve the fatigue life of welded joints. The use of activated flux along with TIG dressing were not yet reported. In this work, an experimental study was conducted on the metallurgical changes and their effects on fatigue life in E350 steel welded by MAG welding with activated flux coating as well as toe TIG dressing. The metallurgical changes induced by various weld conditions and the effect on the fatigue life of welded joints were discussed. Welding conditions were categorised as: as weld (AW), weld with flux coating (FW), weld with TIG dressing (AWT), and flux weld with TIG dressing (FWT). Fatigue tests at stress ranges closer to the yield stress (80 % to 90 % of yield) were studied. In comparison with AW joints, the AWT and FWT showed a fatigue-life improvement of 60 % to 80 %, and 69 % to 103 % respectively. Whereas the FW joints showed 10 % to 17 % deterioration in fatigue life. Upon investigation with electron microscopy it was found that the variation in grain sizes and phase changes induced by the usage of flux and TIG dressing, as well as the changes in weld toe radius by TIG dressing and root strengthening due to extra penetration induced by the use of flux were the reasons behind these fatigue behaviours. In this work a novel effort is made to find a way to improve the fatigue life of a welded joint with a combination of two techniques. The activated flux is used to improve the penetration, whereas TIG dressing is performed to reduce the stress concentration. This new combination of techniques has improved the fatigue life of the weld significantly, which can lead to reduced maintenance costs of welded joints and a longer life.","PeriodicalId":18258,"journal":{"name":"Materiali in tehnologije","volume":null,"pages":null},"PeriodicalIF":0.5,"publicationDate":"2024-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140746413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

CORROSION BEHAVIOUR OF ADDITIVELY MANUFACTURED METALLIC MATERIALS 快速成型金属材料的腐蚀性能

IF 0.5 4区材料科学

Materiali in tehnologije Pub Date : 2024-04-03 DOI: 10.17222/mit.2024.1130

Aleksandra Kocijan

引用次数: 0