MATEC Web of Conferences最新文献_第8页

Investigation of the Optimum Shotcrete Mixing Ratio for Slope Protection using Fly Ash 粉煤灰护坡喷射混凝土最佳配合比研究

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202338402004

Thang Kel Win, Nur Irfah Mohd Pauzi

{"title":"Investigation of the Optimum Shotcrete Mixing Ratio for Slope Protection using Fly Ash","authors":"Thang Kel Win, Nur Irfah Mohd Pauzi","doi":"10.1051/matecconf/202338402004","DOIUrl":"https://doi.org/10.1051/matecconf/202338402004","url":null,"abstract":"Shotcrete has now grown in popularity and can replace cast-in-place (CIP) concrete in applications such as retaining walls and slope stabilisation. However, due to the problems like cracking due to shrinkage and the durability concern, this practise is still limited. So, cementitious material such as fly ash is used in this situation to increase the strength of the concrete and also to make sure it is high durability and safe to use in construction. Fly ash can be known as a coal combustion residual which is commonly occur in thermal power plant and it had been widely used as an alternative material during the production of Portland cement concrete. Supplementary cementitious materials is widely used in the mixing of concrete due to its unique properties which can harden the concrete via its hydraulic and pozzolanic activity. A series of experiments will be conducted to make sure that the fly ash that had been mixed with Portland cement is safe to use and also can increase the compressive strength of the cement. Throughout the experiments, a series of data will be display with the addition of 5%,10%,15%,20%,25%,30%,35% of pozzolans in the cement mixing ratio. The addition of fly ash during the mixing of concrete will indirectly reduce the cost of construction and also the rate of pollution to the environment as it is being classified as a scheduled waste in Malaysia according to the Environmental Quality Act 1974.This research will mainly focus on the performance of shotcrete with the addition of cementitious material which is fly ash as an alternative product compare to the tradition concrete and compare the differences in the achievement of shotcrete with and without the addition of fly ash so that the comparison is more clearly and more understandable. Next, the utilization of the nominal aggregates will be 10-20mm.The amount of fly ash added to the mixing of concrete will be in the range of 5% to 35%.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135212091","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

Post-realization phase of an interior green wall: A case study 室内绿墙的后期实现阶段:一个案例研究

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202338501005

Ivana Halaszova, Renata Baskova

引用次数: 0

Investigation of the interactions between tomatoes and handling devices in mechanized processes 机械化过程中番茄与处理装置相互作用的研究

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202338706003

Ivan Mortev, Miho Mihov, Rumyana Kireva, Viktoriya Kancheva

{"title":"Investigation of the interactions between tomatoes and handling devices in mechanized processes","authors":"Ivan Mortev, Miho Mihov, Rumyana Kireva, Viktoriya Kancheva","doi":"10.1051/matecconf/202338706003","DOIUrl":"https://doi.org/10.1051/matecconf/202338706003","url":null,"abstract":"Tomatoes are a major vegetable crop worldwide. Production costs for large due to high harvesting costs and difficult mechanization. An increase in labour productivity, the profitability of production, the increase in production and the decrease in cost is possible through the introduction of mechanization of production processes, the most important of which is harvesting [19]. It absorbs over 50% of total costs [5, 10]. Mechanized harvesting reduces labour costs 10 times, and according to Bakulev [1], the profitability of production reaches 200%. Research by the University of California [18] indicates that the price of mechanically harvested tomatoes is $9.84/t, and for hand-harvested tomatoes - $17.19/t. Depending on the qualifications of the workers, mechanization saves from 70 to 440 man-hours per hectare. The mechanization of harvesting also has a biological side [6]. The short period of harvesting allows to control the ripening. Thus, the degree of de-esterification of the pectin content beyond the desired can be avoided. A lot of research has been done to create a robot that picks tomatoes but it is still only in the research field. A practically implemented mechanization of the process is achieved with a tomato harvester that harvests the entire crop at once. Due to the large losses due to damage to the fruit and leakage of juice, this method also needs improvement. In the present study, dependencies have been derived that make it possible to determine the parameters of the handling devices in the tomato harvester in order to obtain a better result from the mechanized harvesting of tomatoes.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447943","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

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

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

Effect of SAPs and polypropylene fibres on the freeze-thaw resistance of low carbon roller compacted concrete pavement sap和聚丙烯纤维对低碳碾压混凝土路面抗冻融性能的影响

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337808006

Vahid Afroughsabet, A. Al-Tabbaa

{"title":"Effect of SAPs and polypropylene fibres on the freeze-thaw resistance of low carbon roller compacted concrete pavement","authors":"Vahid Afroughsabet, A. Al-Tabbaa","doi":"10.1051/matecconf/202337808006","DOIUrl":"https://doi.org/10.1051/matecconf/202337808006","url":null,"abstract":"Most concrete currently used in pavement is based on Portland cement (PC), being responsible for 8-10% of total CO2 emission. Moreover, external pavements are subjected to exposure classes XF4 and XD3 which are related to corrosion and freeze-thaw. Freeze-thaw resistance is an important durability property of concrete, especially for concrete pavements that are subjected to the de-icing salts. This study was designed to explore the freeze-thaw resistance and mass scaling resistance of low carbon Roller Compacted Concrete (RCC) in the presence of water and de-icing salts. Four different RCC mixes were used with a water/binder ratio of 0.45. PC was replaced with 80% ground granulated blast-furnace slag (GGBS) in all mixes to develop low carbon concrete and move towards a more sustainable cementitious composite. To assess the effectiveness of smart engineered additives, superabsorbent polymers (SAPs) were used at 0.3% by weight of total binder, and Polypropylene (PP) fibre with 12-mm length at fibre volume fractions of 0.3% for the mitigation of freeze-thaw damage. The compressive strength, freeze-thaw resistance, and mass scaling resistance of concrete specimens were evaluated. The results indicate that both additives improved the compressive strength and freeze-thaw resistance of concrete with and without de-icing salts. The inclusion of PP fibre was more effective compared to the addition of SAPs to mitigate the extent of internal structural damage and mass scaling of self-healing concrete mixes with respect to the reference concrete after 56 freeze-thaw cycles.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"16 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73463814","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

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

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

Self-healing abilities of cement mortars containing microorganisms produced in the process of sewage sludge treatment 污水污泥处理过程中产生微生物的水泥砂浆的自愈能力

MATEC Web of Conferences Pub Date : 2023-01-01 DOI: 10.1051/matecconf/202337802003

Muath Abu Askar, T. Zdeb, J. Chwastowski, L. Ferrara

{"title":"Self-healing abilities of cement mortars containing microorganisms produced in the process of sewage sludge treatment","authors":"Muath Abu Askar, T. Zdeb, J. Chwastowski, L. Ferrara","doi":"10.1051/matecconf/202337802003","DOIUrl":"https://doi.org/10.1051/matecconf/202337802003","url":null,"abstract":"The enormous quantity of sewage water produced each day continues to present a serious challenge for its treatment and management. Sewage water is one of the most abundant sources of biomass, such as bacteria. Concrete, on the other hand, is the second most widely employed substance on the planet, after freshwater. Cracking of concrete is a major factor affecting the strength and durability of the material. The development of a crack pattern can contribute to increasing the permeability of concrete, which is typically associated with a significant decrease in its durability. Under specific circumstances, bio concrete is a self-healing biomaterial. Bacteria have the ability to precipitate calcite in concrete or form a layer of calcite precipitation, which plays a crucial role in the remediation of plastic shrinkage microcracks, thereby enhancing the structural integrity and durability of concrete over the long term. This paper summarises the study of investigating the possibility of using sewage water as a self-healing agent, using bacteria from different stages of treatment to heal cracks in concrete samples, and evaluating the effect of sewage water from different stages of treatment on fresh and hardened concrete properties. Based on the data collected from the experiments. Complete replacement of ordinary tap mixing water with sewage water from the Biological Reactor oxygen Zone achieved cracks healing of a crack width of 200 μm in less than 14 days without compromising the binder and mortar properties such setting time, slump value, compressive and flexural strength when compared to a reference sample made with tap mixing water.","PeriodicalId":18309,"journal":{"name":"MATEC Web of Conferences","volume":"76 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79705958","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