2021 Moratuwa Engineering Research Conference (MERCon)最新文献_第4页

Rare earth element potential in the beach placers along the southwest coast of Sri Lanka 斯里兰卡西南海岸沙滩砂矿的稀土元素潜力

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525678

N. Batapola, N. Dushyantha, N. Ratnayake, R. Premasiri, B. Abeysinghe, O. Dissanayake, S. Rohitha, Saman Ilankoon, P. Dharmaratne

{"title":"Rare earth element potential in the beach placers along the southwest coast of Sri Lanka","authors":"N. Batapola, N. Dushyantha, N. Ratnayake, R. Premasiri, B. Abeysinghe, O. Dissanayake, S. Rohitha, Saman Ilankoon, P. Dharmaratne","doi":"10.1109/MERCon52712.2021.9525678","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525678","url":null,"abstract":"In the recent few years, rare earth elements (REEs) were considered as critical metals with strategic importance due to their high usage in modern technology and green energy applications. Currently, with the unexpected increase of rare earth element (REE) demand and China's market dominance, many REE processing projects are being launched or revived. In this regard, the present work is focused on assessing the REE potential in the beach placers along the southwest coastline in Sri Lanka. The collected 36 beach sand samples from the mean sea-level in the southwest coast during both southwestern and northeastern monsoons were subjected to both elemental and mineralogical analyses. Based on the findings, Galle, Ginthota, Wadduwa, and Thelwatta areas were found with significant contents of REEs ranging from 32.8-1,359.1 mg/kg. Moreover, the results suggest that REE-bearing heavy minerals are heavily concentrated in the beach face due to stronger oceanic currents generated by the strong winds of the southwestern monsoon along with the increased sediment supply by inland rivers. The findings in this study would provide insights for future REE prospecting studies, which is helpful in unraveling the hidden potential of REE resources in Sri Lankan beach placer deposits.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"74 1","pages":"415-420"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81624793","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

Global warming potential of English brick manufacturing in Sri Lanka: A cradle to gate analysis 斯里兰卡英国砖制造业的全球变暖潜力:从摇篮到大门的分析

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525760

Indisa Herath, S. Karunaratne, Dilshi Dharmarathna

{"title":"Global warming potential of English brick manufacturing in Sri Lanka: A cradle to gate analysis","authors":"Indisa Herath, S. Karunaratne, Dilshi Dharmarathna","doi":"10.1109/MERCon52712.2021.9525760","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525760","url":null,"abstract":"Clay bricks are one of the most commonly used walling materials in Sri Lanka. The brick manufacturing process poses a notable impact on the environment. Clay excavation leads to resource depletion while diesel fuel utilized for excavation and clay transportation pollutes the air. Additionally, tree cutting for wood fuel contributes to deforestation whilst wood burning promotes air pollution. Thus, this research aimed to quantify the global warming potential due to English brick manufacturing using cradle to gate Life Cycle Assessment (LCA) approach. The functional unit used was one-meter square of the brick wall area. Data collection, analysis and interpretation of results were done by the ISO 14044/14040 standards. Primary life cycle inventory data was gathered via brick kiln owners and workers. The LCA assembly was modelled using the ‘OpenLCA’ software. Three product systems were defined according to the brick bond types and wall thicknesses. The global warming potential related to brick production was assessed using the ‘GWP 100a’ method. Clay excavation, clay transportation and wood chamber firing emerged as emission hotspots. The study revealed that the global warming potential of 225mm brick wall and 115mm brick wall as 11.9 and 5.9 kg CO2-eq/m2, respectively. Through this study, local clay brick industry can be driven to improve the overall sustainability of the brick manufacturing sector.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"26 1","pages":"251-256"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82864326","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 Mechanical Properties of Rice Straw Ash-filled Natural Rubber Compounds 稻秆灰分填充天然橡胶胶料力学性能研究

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525799

A. Fernando, W. Pabasara, K.Y. Gayashini, D. Liyanage

{"title":"Investigation of Mechanical Properties of Rice Straw Ash-filled Natural Rubber Compounds","authors":"A. Fernando, W. Pabasara, K.Y. Gayashini, D. Liyanage","doi":"10.1109/MERCon52712.2021.9525799","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525799","url":null,"abstract":"Rice straw is the one of highest plant-based waste generated in Sri Lanka. Farmers burn rice straw without taking any advantage making substantial air pollution. It is found that rice straw ash contains a significant amount (62%-82%) of silica which is a prominent reinforcing filler material in rubber compounding. The present research work focuses on incorporation of rice straw ash as an alternative filler material in rubber compounding. Up to date, different ratios of rice straw ash has been incorporated with selected rubber compound replacing the silica filler loading and tensile, tear strength, hardness, compression set properties have been investigated. These properties were compared with those of the reference sample prepared according to the same formulation but without adding rice straw ash. The sample containing the same proportion of rice straw ash and silica showed the highest tensile strength compared with that of the control sample. Further, tensile strength of the sample which contained only rice straw ash was also higher than that of the control sample. The rice straw ash has a strong ability to improve the tensile properties of the rubber vulcanizates, while it negatively affects the other mechanical properties such as hardness, tear strength and compression set.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"15 1","pages":"43-47"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86531811","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

Optimize Technical Properties with Master Batch Blends in RSS/Scrap Rubber Tire Retread Compounds 用母料共混物优化RSS/废橡胶轮胎翻新料的技术性能

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525745

K. Alahapperuma

{"title":"Optimize Technical Properties with Master Batch Blends in RSS/Scrap Rubber Tire Retread Compounds","authors":"K. Alahapperuma","doi":"10.1109/MERCon52712.2021.9525745","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525745","url":null,"abstract":"Nowadays, polymers as a group of materials have occupied in major areas of human lives. Natural rubber (NR) is a substitute for synthetic rubbers in majority of applications, and higher prices of petroleum-based products have resulted in higher cost involvements in NR rubber compounds. This has resulted in partial replacement of higher grade Ribbed Smoked Sheet (RSS) NR with lower grade scrap rubber in most of the rubber products, especially retreading tire compounds. In preparation of rubber mixes, usual practice is to mix both types of rubber together and added with carbon black, oil and other ingredients subsequently, according to an order. Aim of this study was to get optimum technical properties of a selected retreading tire compound of (80%) RSS and (20%) scrap rubber with the use of master batch preparations; i.e. the amount of carbon black was added separately into two types of blended rubber and mixed separately. The master batch mix design with 80% carbon black incorporated into RSS and 20% carbon black incorporated into scrap rubber showed a better balance of technical properties than the properties obtained with other master batch mix designs and also the normal mix design.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"45 1","pages":"549-554"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89581872","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

Numerical Modeling of Drying Behavior of Sri Lankan Kaolin 斯里兰卡高岭土干燥特性的数值模拟

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525774

J. Jayaweera, M. Narayana, S. Adikary

{"title":"Numerical Modeling of Drying Behavior of Sri Lankan Kaolin","authors":"J. Jayaweera, M. Narayana, S. Adikary","doi":"10.1109/MERCon52712.2021.9525774","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525774","url":null,"abstract":"Drying process of green ceramic bodies are complicated due to simultaneous and coupled heat and mass transfers. Dimensional variations and mechanical stresses occur within the ceramic body during drying may create defects in the final product if drying conditions are not carefully controlled. In this study, the drying behavior of Sri Lankan Kaolin was investigated. Initially, Kaolin was characterized using wet chemical analysis and X-ray diffraction to investigate structure and composition. Two batches of Kaolin with different particle size distributions were prepared using wet ball mill grinding with average particles size (D50) of $4.07 mumathrm{m}$ and $3.57 mumathrm{m}$ respectively. Green ceramic samples were obtained using extrusion process. Samples were dried in oven at 60°C and moisture variation of the green product was measured with time. Critical moisture content of the Sri Lankan Kaolin was 1.50%. Mathematical relationship was formulated to determine drying behavior of Sri Lankan Kaolin. An unsteady three-dimensional (3D) model was developed and simulated in Computational Fluid Dynamics (CFD) framework. Simulation results developed by the model were compared with data obtained by experiments conducted using Sri Lankan Kaolin. The model results were validated and comply with experiments results and R2 value was 0.9.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"60 1","pages":"48-53"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88763730","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

MERCon 2021 Committee

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/mercon52712.2021.9525688

引用次数: 0

Development of Design Guidance for Circular Reinforced Concrete Columns Incorporating Crack Width 考虑裂缝宽度的钢筋混凝土圆形柱设计指南的编制

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525676

G. C. S. Jayaweera, H. D. Hidallana-Gamage, W. P. R. Indrajith

{"title":"Development of Design Guidance for Circular Reinforced Concrete Columns Incorporating Crack Width","authors":"G. C. S. Jayaweera, H. D. Hidallana-Gamage, W. P. R. Indrajith","doi":"10.1109/MERCon52712.2021.9525676","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525676","url":null,"abstract":"Maximum crack width of reinforced concrete (RC) structures should be controlled for satisfying the serviceability and durability requirements of the structures. However, the crack width analysis of RC structures is not much easy because of the complexity of the parameters which affect the crack width. In the Sri Lankan context, there is no specific simplified guidance in terms charts and tables for crack width calculations of circular RC columns. Hence, it is important to develop such guidance. This research deals with the crack width analysis of circular RC columns in straight viaduct sections. A comprehensive study was carried out regarding the behaviour of the cracks in circular RC columns in viaduct sections as per the design standard, BS 5400. Autodesk Structural Bridge Design software was used to perform crack width calculations and MIDAS Civil software was used to do the Finite Element Analysis (FEA) and validation process. The comprehensive design charts developed in this research will be useful in calculating the crack widths in circular RC columns without following any time-consuming methods. Therefore, the findings of this research will be helpful to enhance the efficiency of the design work related to the crack width calculations of circular RC columns.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"163 1","pages":"148-153"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86422880","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

Modeling Surface Conductivity in a Sweat Analyzing Wearable Smart Textile Platform 汗液分析可穿戴智能纺织品平台表面电导率建模

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525788

Madushi H Medagedara, Tharushi Shavindya Peiris, N. Wanasekara

{"title":"Modeling Surface Conductivity in a Sweat Analyzing Wearable Smart Textile Platform","authors":"Madushi H Medagedara, Tharushi Shavindya Peiris, N. Wanasekara","doi":"10.1109/MERCon52712.2021.9525788","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525788","url":null,"abstract":"Wearable self-health monitoring devices are a contemporary necessity with modern life-style and health implications of this decade. Current devices have transitioned to non-invasive sampling due to benefits including minimal possibility of infections, convenience, no requirement for storage, and physiological safety of neo-natal and geriatric patients. Sweat, in this regard, is of importance as the variations in the sweat composition have been validated as bio markers of different diseases. Corresponding variations in the surface resistivity as the sweat composition is changed, has been introduced in this novel research with a synergistic approach, based on developing a conductive sweat sensing and analyzing textile platform. The relationship between the macro porosity of the proposed textile platform and the measured surface conductivity values has been mathematically modeled and presented in this paper. A simulation of the mathematical model concluded that variations in the localized surface area for sweat accumulation and the fabric weight of the textile platform has minimal effect on the performance of the wearable sweat monitoring platform, while a satisfactorily measurable surface conductivity value can be obtained at sweat concentration levels in the order 0.01M.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"15 1","pages":"608-613"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81168705","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

Invited Talk: Recent development of a 2D/3D hybrid finite-discrete element simulator for rock fracture process under quasi-static and dynamic loading conditions 特邀演讲:用于准静态和动态加载条件下岩石破裂过程的二维/三维混合有限-离散单元模拟器的最新进展

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/mercon52712.2021.9525666

引用次数: 0

Optimum Utilization of Daylighting in Office Buildings 办公建筑采光的优化利用

2021 Moratuwa Engineering Research Conference (MERCon) Pub Date : 2021-07-27 DOI: 10.1109/MERCon52712.2021.9525696

V.H.M.S. Babalagama, S. Pathirana

{"title":"Optimum Utilization of Daylighting in Office Buildings","authors":"V.H.M.S. Babalagama, S. Pathirana","doi":"10.1109/MERCon52712.2021.9525696","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525696","url":null,"abstract":"Maximizing day light usage to occupant's comfort level is a modern energy saving technique for most aspect of a sustainable building management system. Due to tropical climate condition in Sri Lanka using a high window to wall ratio is not an effective method of daylight harvesting in modern buildings. This research introduces experiential optimization of daylight usage in an office building tor educe energy in t he occupant's comfort zone. Using the software Design-Builder 4.8 with energy plus to demonstrate the dynamic role of simulation tool in this case study. The selected case is a four-story building of total area of 3441 square meters and external window area of 1053 square meters overall. The longest side of the building oriented to east-west. There is a problem of direct sun light and heat inside the building according to its high window to wall ratio. This research helps to determine the consequence of effect of direct sunlight simulation and total energy to be compared with three stages. Optimize the day light harvesting providing 1.5 meters width sunshades along with providing three types of window films. Best optimization results of 6 7% energy saving f or the sunshade along with reflective tint comparatively a ssume that all the windows closed in basic model.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"143 1","pages":"235-239"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90701940","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