MATEC Web of Conferences最新文献_第10页

Self-sensing Sustainable Cementitious Mixtures Incorporating Carbon Fibres 含有碳纤维的自感知可持续胶凝混合物

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337805007

Thamer Almotlaq, M. Saafi

{"title":"Self-sensing Sustainable Cementitious Mixtures Incorporating Carbon Fibres","authors":"Thamer Almotlaq, M. Saafi","doi":"10.1051/matecconf/202337805007","DOIUrl":"https://doi.org/10.1051/matecconf/202337805007","url":null,"abstract":"This paper focuses on sustainable cementitious composites in terms of their conductivity, hydration and self-sensing properties, which are key features for smart city infrastructures. Smart cities have massive infrastructures that are interconnected, transmitting data and information for health-monitoring and performance optimization. In this regard, having them made of sustainable building materials (concrete) that are also sufficiently conductive, will be a suitable solution for structures’ performance. The studied sustainable cementitious mixtures are made by sea components (sea water and sea sand), which are abundant resources. The primary goal of this study is to improve the mixes’ electrical conductivity and sensitivity. To achieve this goal, milled carbon fibres (MCFs) and chopped carbon fibres (CCFs) in 6 different proportions were added to the cementitious mixes. The experimental study is divided into impedance spectroscopy to study the conductivity and hydration development, and self-sensing properties, conducted on various mix designs. The results show that incorporating sea components improve the electrical conductivity of the mixes by 40-50%. Further improvements were achieved by adding MCF as it shows a remarkable reduction by 60% compared to the plain ss-sw (sea sand and sea water) samples. Adding CCF improved the conductivity even further and resulted in sample’s resistivity as low as 53 Ωcm after 1 year of curing time.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90372540","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

Design of a NC machine tool for machining that is easy to change cutting tools 设计了一种便于更换刀具的数控加工机床

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202338001009

Zhiqiang Wan, Qingqing Zhang

引用次数: 0

Limits and possibilities of thermodynamic modelling of autogenous self-healing of concrete 混凝土自愈的热力学模型的限制和可能性

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337809003

Daniel Lahmann, S. Kessler

{"title":"Limits and possibilities of thermodynamic modelling of autogenous self-healing of concrete","authors":"Daniel Lahmann, S. Kessler","doi":"10.1051/matecconf/202337809003","DOIUrl":"https://doi.org/10.1051/matecconf/202337809003","url":null,"abstract":"Autogenous self-healing of water retaining concrete structures is included in Eurocode 1992-3 as a possibility to heal cracks up to a width of 200 μm without additional repair. In this self-healing scenario water flow through a crack should result in a progressive closure of the fracture, mainly due to CaCO3 precipitation, when certain hydraulic gradients are met, the pH of the water is > 5.5 and the concentration of CO2 in the water remains < 40 mg*L-1. The material composition is not further restricted by the regulation. However, despite standardization, the healing effect seems to be random in practice, which requires further research, while experiments aimed at quantifying autogenous self-healing are expensive and time-consuming. Thermodynamic models could support in estimating the effect of different environments such as groundwater or seawater exposure on autogenous self-healing. Moreover, adjusting the water chemistry according to the conditions of different construction sites and changing the material design could easily be considered. In this study thermodynamic models of a hydrated CEM I 52.5 R paste that is exposed to either simulated groundwater or seawater are discussed concerning the influence on autogenous self-healing and compared to experimental and literature data.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78549284","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

Bond behaviour evaluation between steel reinforcement and self-healing concrete containing non-axenic biomasses 钢筋与含非无菌生物质的自愈混凝土粘结性能评价

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337802009

H. Hermawan, M. M. Tezer, W. Verstraete, N. De Belie, P. Serna, E. Gruyaert

{"title":"Bond behaviour evaluation between steel reinforcement and self-healing concrete containing non-axenic biomasses","authors":"H. Hermawan, M. M. Tezer, W. Verstraete, N. De Belie, P. Serna, E. Gruyaert","doi":"10.1051/matecconf/202337802009","DOIUrl":"https://doi.org/10.1051/matecconf/202337802009","url":null,"abstract":"Although steel reinforcements are used to withstand tensile forces in concrete, cracks are an unavoidable phenomenon. The presence of cracks, in fact, increases the risk for lowering the service life and durability of concrete structures. A critical issue occurs when due to splitting forces, cracks appear in concrete along the tensioned rebars which damage the bonding between the steel and concrete matrix. As a mitigation plan, the cracks should be healed at short notice and the bonding has to be recovered by the potential use of healing agents. This paper aims to investigate the bond behaviour of steel reinforcement in self-healing concrete. Two biomasses were employed as healing agents namely HTN (bacteria-based) and YEAST (fungi-based). The fresh and hardened properties of the normal and self-healing concretes were initially evaluated. The bond properties were investigated by performing pull-out tests on three different states of concrete: uncracked, cracked, and healed. Results revealed that the additions of biomasses did not induce negative effects on the compressive strength of hardened concrete. Moreover, the average bond strength of uncracked concretes containing HTN and YEAST improved by 20% and 8%, respectively, as compared with normal concrete. The introduction of a crack caused a significant reduction in bond strength regardless of the addition of healing agents. Nevertheless, it was found that the bond strength was slightly recovered after healing under water immersion.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78728033","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: 1

Development of an EMS dedicated to the control of a solar power plant, coupled with a thermal battery 开发一种专用于控制太阳能发电厂的EMS，并与热电池相结合

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337904005

G. Hétreux, Lise Mallier

引用次数: 0

The sustainability profile of a biomimetic 3D printed vascular network to restore the structural integrity of concrete 仿生3D打印血管网络的可持续性概况，以恢复混凝土的结构完整性

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337806002

Davide di Summa, Yasmina Shields, V. Cappellesso, L. Ferrara, N. De Belie

{"title":"The sustainability profile of a biomimetic 3D printed vascular network to restore the structural integrity of concrete","authors":"Davide di Summa, Yasmina Shields, V. Cappellesso, L. Ferrara, N. De Belie","doi":"10.1051/matecconf/202337806002","DOIUrl":"https://doi.org/10.1051/matecconf/202337806002","url":null,"abstract":"Among the various possibilities to tackle the issue of concrete damage within its structural service life, the biomimetic approach has favoured the development of innovative solutions such as the use of 3D printed vascular networks suitably incorporated into concrete structural elements to inject and convey the most suitable healing agent upon crack occurrence. These systems, able to cope with damage of different intensities, may lead to improvements of the structure’s durability, through the closure of cracks, and a consequent reduction of the frequency of major maintenance activities. The present work investigates the environmental sustainability of the aforesaid self-healing technology through a Life Cycle Assessment (LCA) analysis. The attention has been also focused on the 3D printing process of the network due to the key role that it could play, in terms of environmental burdens, when upscaled to real-life size applications. The case study of a beam healed by means of polyurethane injected through the network and exposed to a chloride environment is reported to better predict the potential improvements in terms of overall durability and consequent sustainability within the pre-defined service life.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73951134","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: 1

Investigation of the interfacial bonding effect on self-sensing cementitious coatings for infrastructure monitoring 基础设施监测用自传感胶凝涂层界面粘结效果研究

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337805006

C. Vlachakis, Yen-Fang Su, A. Al-Tabbaa

{"title":"Investigation of the interfacial bonding effect on self-sensing cementitious coatings for infrastructure monitoring","authors":"C. Vlachakis, Yen-Fang Su, A. Al-Tabbaa","doi":"10.1051/matecconf/202337805006","DOIUrl":"https://doi.org/10.1051/matecconf/202337805006","url":null,"abstract":"In the field of structural health monitoring, self-sensing cementitious binders have gained great attention over the past decades due to their high sensing performance and durability. In particular, self-sensing cementitious coatings have seen increased interest due to their high compatibility with concrete structures and their ability to monitor existing infrastructure while using low amounts of material and at lower costs. Geopolymer coatings display favorable characteristics for this application due to their innate electrical properties and high bond strength with concrete structures. Despite the research that has been carried out on self-sensing coatings, the effect of the interfacial bond between the coating and substrate on the coating’s sensing performance has not been investigated. Poor bonding between the two materials can lead to low-quality sensing measurements and data misinterpretation. In this paper, we aim to investigate the bonding effect on the sensing performance of self-sensing geopolymer coatings. For this study fly ash-metakaolin geopolymer coatings were applied onto concrete substrates; the concrete surfaces were treated by employing three different surface preparation methods: mechanical brooming, chemical treatment and the untreated cast surface. The bond strength for each preparation technique was measured with the splitting tensile bond test and the sensing response for the geopolymer coatings under repeated loading was also characterized. Through proper understanding of the interface between cementitious materials, sensing coatings can be tailored accordingly to achieve high sensing performance and thus allowing high-quality monitoring and proactive maintenance in civil infrastructure.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"63 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74944184","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

Design of Parts Flexible Palletizing System 零件柔性码垛系统的设计

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202338001002

Yuanyuan Yang, Ligang Qiang, Yong Zhang, Xudong Yang

引用次数: 0

Potential for the integration of alternative energies in the process industry 在加工工业中整合替代能源的潜力

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337907003

Lucille Payet, Elieta Carlu, Léo Pasquier, C. Debard

引用次数: 0

Oxidation of styrene to benzaldehyde and styrene oxide over nickel and copper ceria solution combustion catalysts 苯乙烯在镍和铜铈溶液燃烧催化剂上氧化为苯甲醛和苯乙烯氧化物

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337401004

Qinisani Gazu, Mzamo L. Shozi, P. Mpungose

{"title":"Oxidation of styrene to benzaldehyde and styrene oxide over nickel and copper ceria solution combustion catalysts","authors":"Qinisani Gazu, Mzamo L. Shozi, P. Mpungose","doi":"10.1051/matecconf/202337401004","DOIUrl":"https://doi.org/10.1051/matecconf/202337401004","url":null,"abstract":"CeO2, Cu0.05Ce0.95O2-δ, Ni0.04Ce0.96O2-δ, Cu0.05Ni0.05Ce0.90O2-δ, catalysts were synthesised via solution combustion technique using urea as a fuel. The as pre-preared catalysts were characterised via X-ray powder diffraction, Brunauer-Emmett-Teller surface area analysis, transmission and scanning electron microscopy analysis. The characterisation techniques strongly suggested that all the catalysts were prepared successfully, and that copper and nickel were successfully incorporated into the lattice structure of ceria. The effect of the reaction conditions on the catalytic properties of the synthesised material were studied in detail using Cu0.05Ni0.05Ce0.90O2-δ as the model catalyst. The effect of temperature, solvents and co-oxidants was investigated in optimisation studies. A combination of acetonitrile, tert-butyl hydroperoxide and a temperature of 60 °C were found to be optimal after 24 hours and used for all catalysts. All catalysts were found to be active in styrene oxidation under these conditions, with styrene conversion as high as 69% over Ni0.04Ce0.96O2-δ, and selectivity to benzaldehyde and styrene oxide 38 and 26% respectively.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74073225","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