Journal of Materials and Polymer Science最新文献

Concrete with Accelerated Naturally Carbonated Recycled Concrete Aggregates 使用加速天然碳化再生混凝土骨料的混凝土

Journal of Materials and Polymer Science Pub Date : 2024-07-15 DOI: 10.47485/2832-9384.1057

引用次数: 0

Durability and Recycling of Rubber Concrete 橡胶混凝土的耐久性和回收利用

Journal of Materials and Polymer Science Pub Date : 2024-05-13 DOI: 10.47485/2832-9384.1054

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The Uncertainty of Reusable Building Components/MaterialsA Subsidiary of Circular Economy in the Africa Construction Sector: The Issue of Affordable Housing in Kenya 可重复使用建筑构件/材料的不确定性--非洲建筑行业循环经济的附属品：肯尼亚的经济适用房问题

Journal of Materials and Polymer Science Pub Date : 2024-05-03 DOI: 10.47485/2832-9384.1053

{"title":"The Uncertainty of Reusable Building Components/Materials\u0000A Subsidiary of Circular Economy in the Africa Construction Sector: The Issue of\u0000 Affordable Housing in Kenya","authors":"","doi":"10.47485/2832-9384.1053","DOIUrl":"https://doi.org/10.47485/2832-9384.1053","url":null,"abstract":"There is growing interest in the adaptation of circular economy approaches in the construction sector, for developing African countries like Kenya with an increase in construction activities leading to more generation of construction wastes. The approach of circularity presents an alternative to reuse these construction or demolition wastes thereby lowering environmental risks and providing for a lower price for building components/materials required for affordable building projects. However, there is little, or no information on these reusable building components/materials, which lowers the confidence by construction stakeholders in using them. No information on its possible new life longevity (durability), its possible maintenance budget, and no means of enabling a design team to plan for its acquisition (accessibility) in a design project. This paper adopted a review of previous literature on these topics to search for possible solutions to the research questions, of which some literature provided only a list of requirements needed to give a level of information to reusable building elements. The paper went further to provide proposals for an information catalogue that would enable the insertion of reusable building elements’ Indicators of service (availability, reliability, and maintainability) obtainable from experience with the elements. Also, a format for a maintenance budget plan would be required during the new service life of the reused element. And a means of simulation using the Monte Carlo simulation tool to obtain reliable viability of access to reusable building elements in a transitional building in its design stage. These proposals would have to be put into practice to ascertain their effectiveness, meanwhile, other areas of further studies are provided in the paper.","PeriodicalId":372397,"journal":{"name":"Journal of Materials and Polymer Science","volume":"62 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141016669","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An Investigation on the Effect of N-Hydroxyphthalimde and Supercritical Carbon Dioxide on the Peroxide Degradation of Polypropylene 关于 N-羟基邻苯二甲酰亚胺和超临界二氧化碳对过氧化物降解聚丙烯的影响的研究

Journal of Materials and Polymer Science Pub Date : 2024-03-14 DOI: 10.47485/2832-9384.1049

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Studying the Effect of Different Lubricant Materials on the Tribological Properties & Hardness of Cu-Fe Composite Prepared By PM 研究不同润滑材料对 PM 制备的铜铁复合材料摩擦学特性和硬度的影响

Journal of Materials and Polymer Science Pub Date : 2024-03-10 DOI: 10.47485/2832-9384.1048

引用次数: 0

Ultra-High Performance Concrete: Recycling and Issues 超高性能混凝土：回收与问题

Journal of Materials and Polymer Science Pub Date : 2024-03-08 DOI: 10.47485/2832-9384.1047

{"title":"Ultra-High Performance Concrete: Recycling and Issues","authors":"","doi":"10.47485/2832-9384.1047","DOIUrl":"https://doi.org/10.47485/2832-9384.1047","url":null,"abstract":"Ultra-high performance concrete (UHPC) is used in infrastructure due to the outstanding mechanical and durability properties. On the other hand, infrastructures reach an end of life and all materials must be restored, replaced or recycled. Two years old UHPC was conventionally crushed with some difficulties, due to the high steel fibres content and strength, to prepare aggregates (0-32 mm). Some aggregates still contained fibres. A concrete with compressive strength class C 30 / 37 was taken as a reference and a mixture with 50% addition of UHPC recycled aggregates was prepared. The blend with 50% UHPC aggregates exhibited a reduction of the strength at 28 days at 40 MPa as compared to the reference mixture with 68 MPa. The modulus of elasticity was reduced to 25’295 MPa. The reference mixture showed 36’709 MPa. The chloride migration was 10.3 x 10-12 m2/s for the UHPC recycled concrete and 8.2 x 10-12 m2/s for the reference. The water permeability of the recycled mixture with UHPC aggregates showed a higher value of 11.7 g/m2h as compared to 8.3 g/m2h of the reference. The values correlated with the higher saturable porosity 17.2% of the recycled UHPC mix. Thus, the recycling of UHPC needs a modified demolition and crushing procedures as for conventional concrete. The addition of UHPC aggregates in conventional concrete does not necessarily improve the performance. Adjustments in the aggregate preparation and mix design are required to allow the use of recycled UHPC aggregates within cementitious systems.","PeriodicalId":372397,"journal":{"name":"Journal of Materials and Polymer Science","volume":"13 21","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140258132","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A New Approach for Durable and Sustainable Infrastructure Concrete 实现持久和可持续基础设施混凝土的新方法

Journal of Materials and Polymer Science Pub Date : 2024-02-27 DOI: 10.47485/2832-9384.1045

引用次数: 0

Buckling Structures, A Relevant Signature of the Mechanical Properties of Film/Substrate Systems 屈曲结构--薄膜/基底系统机械特性的相关特征

Journal of Materials and Polymer Science Pub Date : 2024-02-07 DOI: 10.47485/2832-9384.1046

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Comparison Between MPPT P&O and MPPT Fuzzy Controllers for Photovoltaic Maximum Power Point Tracking 光伏最大功率点跟踪 MPPT P&O 与 MPPT 模糊控制器的比较

Journal of Materials and Polymer Science Pub Date : 2024-01-16 DOI: 10.47485/2832-9384.1044

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Morphological and Thermal Analysis of Poly(L-lactic acid)/ Carboxymethyl Cellulose Bio-composites 聚（L-乳酸）/羧甲基纤维素生物复合材料的形态学和热分析

Journal of Materials and Polymer Science Pub Date : 2023-11-20 DOI: 10.47485/2832-9384.1040

Md. Hafezur Rahaman, Mahfuja Rahman, S. M. N. Alam, M. Sultana, Md. Masud Parvez, Asadullah Ahmed

{"title":"Morphological and Thermal Analysis of Poly(L-lactic acid)/ Carboxymethyl Cellulose Bio-composites","authors":"Md. Hafezur Rahaman, Mahfuja Rahman, S. M. N. Alam, M. Sultana, Md. Masud Parvez, Asadullah Ahmed","doi":"10.47485/2832-9384.1040","DOIUrl":"https://doi.org/10.47485/2832-9384.1040","url":null,"abstract":"Poly (L-lactic acid) (PLLA) and carboxymethyl cellulose (CMC) are derived from renewable resources and both have excellent properties such as biocompatibility and biodegradability. Applications of PLLA are restricted for some of its inadequate physical properties such as low glass transition temperature, relatively low melting point, high crystallization temperature, slow crystallization rate, and poor heat stability. This study aims to prepare and characterize a renewable bio-composite with more adequate properties for applications by solution casting of different PLLA, and CMC ratios. CMC was prepared from microcrystalline cellulose (MCC) of mustard stalks (agricultural wastes) and the yield was about 78%. The samples were analyzed via Fourier transform infrared (FTIR) spectroscopy, differential scanning calorimetric (DSC), wide-angle X-ray diffraction (WAXRD), and scanning electron microscopy (SEM) for spectroscopic and thermal properties characterization. The interaction between carboxylate groups of CMC surfaces and the terminal hydroxyl, terminal carboxyl, and carbonyl groups of PLLA through hydrogen bonds caused the shift and broadening of the band of FTIR spectra. The decomposition temperature of CMC was increased and formed excellent bio composites with PLLA. Composite crystallinity varied with the percentages of the CMC. The fibrous form of CMCs is present in the SEM micrograph indicating cellulose's fibrous structure was not affected by carboxymethylation. In composites, the surfaces of CMC fibers are layered and different from the reported results of SEM micrographs of PLLA/MCC composites. PLLA/CMC performs better in thermal properties but its mechanical characteristics cannot be determined owing to a limitation where the composite was too brittle and not able to undergo tensile testing.","PeriodicalId":372397,"journal":{"name":"Journal of Materials and Polymer Science","volume":"147 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139259096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0