This paper describes an approach extended from Ritz method to analyze the free vibration of thin isotropic annular plates in good accuracy, and presents comprehensive lists of natural frequencies of the plate for all possible sets of classical boundary conditions. Analytical process is developed to introduce the boundary index that allows to accommodate any sets of free, simple supported and clamped edges along inner and outer boundary of the plate. Convergence and comparison studies are made to demonstrate numerical accuracy in the frequency parameters. Results are summarized for nine sets of boundary conditions and six different ratios of (inner radius)/(outer radius), and are intended to serve for uses of design data and comparison in relevant future papers.
{"title":"Accurate Results by the Ritz Method for Free Vibration of Uniform Annular Plates","authors":"Y. Narita","doi":"10.4028/p-pSQB6L","DOIUrl":"https://doi.org/10.4028/p-pSQB6L","url":null,"abstract":"This paper describes an approach extended from Ritz method to analyze the free vibration of thin isotropic annular plates in good accuracy, and presents comprehensive lists of natural frequencies of the plate for all possible sets of classical boundary conditions. Analytical process is developed to introduce the boundary index that allows to accommodate any sets of free, simple supported and clamped edges along inner and outer boundary of the plate. Convergence and comparison studies are made to demonstrate numerical accuracy in the frequency parameters. Results are summarized for nine sets of boundary conditions and six different ratios of (inner radius)/(outer radius), and are intended to serve for uses of design data and comparison in relevant future papers.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"32 1","pages":"11 - 20"},"PeriodicalIF":0.0,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80817453","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}
An analytical method is presented for free vibration of a symmetrically laminated rectangular plate with point masses, and experimental modal analysis is conducted to compare both sets of the frequency data. The problem is solved by an extending Ritz method to include kinetic energy caused by added point masses under any sets of edge conditions, and a frequency equation is derived by minimizing the energy functional. In numerical computation, the accuracy of the solution is studied by convergence test and comparison with the existing result in the specific case. Then, the experimental modal analysis is applied to measure the natural frequencies and mode shapes. The two sets of results are compared, and the validity of both theoretical and experimental approaches is established.
{"title":"Analytical and Experimental Study for Vibration of Laminated Rectangular Plates with Point Masses","authors":"S. Honda, Katsuhiko Sasakir, Y. Narita","doi":"10.4028/p-fg323A","DOIUrl":"https://doi.org/10.4028/p-fg323A","url":null,"abstract":"An analytical method is presented for free vibration of a symmetrically laminated rectangular plate with point masses, and experimental modal analysis is conducted to compare both sets of the frequency data. The problem is solved by an extending Ritz method to include kinetic energy caused by added point masses under any sets of edge conditions, and a frequency equation is derived by minimizing the energy functional. In numerical computation, the accuracy of the solution is studied by convergence test and comparison with the existing result in the specific case. Then, the experimental modal analysis is applied to measure the natural frequencies and mode shapes. The two sets of results are compared, and the validity of both theoretical and experimental approaches is established.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"39 1","pages":"1 - 10"},"PeriodicalIF":0.0,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77849202","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}
In general, buildings can be classified into Engineering buildings and Non-engineering buildings. Non-engineering building is a simple building such as a residential house that does not carry out structural calculations. Non-engineering buildings are very susceptible to lateral loads such as earthquakes which can cause collapse. Therefore, research is carried out in the form of laboratory tests and numerical tests for reinforced concrete frames filled with prefabricated cellular lightweight concrete (CLC). In this study, two specimens were used, namely an empty frame and a reinforced concrete frame filled with prefabricated CLC. In the laboratory test, it was analyzed by means of a cyclic load test, while in the numerical test the first specimen was made an open frame model and the second infill wall was made as an equivalent diagonal strut. Both of these models were analyzed using the SAP 2000 application version 22 by applying pushovers. The results showed that there were differences in laboratory tests and numerical tests. Therefore, a correction value for the numerical test results is needed to approach the value of the numerical test results.
{"title":"Laboratory Testing and Numerical Analysis on Reinforced Concrete Frames with Prefabricated Cellular Lightweight Concrete (CLC)","authors":"Reski Ainun Bahri, M. Tjaronge, M. A. Caronge","doi":"10.4028/p-p22Vdi","DOIUrl":"https://doi.org/10.4028/p-p22Vdi","url":null,"abstract":"In general, buildings can be classified into Engineering buildings and Non-engineering buildings. Non-engineering building is a simple building such as a residential house that does not carry out structural calculations. Non-engineering buildings are very susceptible to lateral loads such as earthquakes which can cause collapse. Therefore, research is carried out in the form of laboratory tests and numerical tests for reinforced concrete frames filled with prefabricated cellular lightweight concrete (CLC). In this study, two specimens were used, namely an empty frame and a reinforced concrete frame filled with prefabricated CLC. In the laboratory test, it was analyzed by means of a cyclic load test, while in the numerical test the first specimen was made an open frame model and the second infill wall was made as an equivalent diagonal strut. Both of these models were analyzed using the SAP 2000 application version 22 by applying pushovers. The results showed that there were differences in laboratory tests and numerical tests. Therefore, a correction value for the numerical test results is needed to approach the value of the numerical test results.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"48 1","pages":"37 - 43"},"PeriodicalIF":0.0,"publicationDate":"2023-06-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84083719","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}
Commercial buildings are high energy consumption buildings due to lighting system, cooling, and heating requirements (HVAC) for main corridors, shops, and other services. This research is offering an innovative environmental solution for one floor existing commercial buildings by retrofitting the design to be naturally ventilated which lead to reduce building energy consumption and Co2 production. This Research main concept is ventilating corridors and common spaces at one-floor commercial building naturally and achieving users’ thermal comfort even in the hottest day at summer.Research case study is one-floor existing commercial building in Ras El Bar, Egypt. Building model is constructed in Design Builder software to simulate building energy consumption in the current design as base case and compare different environmental solutions results with it to estimate the energy and Co2 reduction. Also, CFD simulation for different design proposals is simulated to guarantee comfort natural air flow inside the corridors for building users.In addition to visit to building site to measure temperature and wind speed by multi-functional anemometer in many focal points indoor and outdoor the building, to consider any missing data that could affect on the final decision.Finally, after simulating more than one solution, the study present solution that naturally ventilate the on-floor commercial building and achieved users’ thermal comfort at summer.
商业建筑是高能耗建筑，主要走廊、商店和其他服务的照明系统、制冷和采暖要求(HVAC)。这项研究为现有的一层商业建筑提供了一个创新的环境解决方案，通过改造设计使其自然通风，从而减少建筑能耗和二氧化碳的产生。本研究的主要概念是为一层商业建筑的走廊和公共空间进行自然通风，即使在夏季最热的一天也能实现用户的热舒适。研究案例为埃及Ras El Bar的一层现有商业建筑。在Design Builder软件中构建建筑模型，以模拟当前设计中的建筑能耗作为基准案例，并与不同的环境解决方案结果进行比较，以估算能源和二氧化碳的减少量。并对不同设计方案进行CFD模拟，保证建筑使用者在走廊内自然气流的舒适性。此外，还到建筑工地实地考察，利用多功能风速仪在建筑室内外多个焦点测量温度和风速，以考虑任何可能影响最终决策的缺失数据。最后，在对多个方案进行模拟后，提出了对层内商业建筑进行自然通风，实现用户夏季热舒适的解决方案。
{"title":"Innovative Environmental Solution for One Floor Existing Commercial Buildings Located in Hot Climate to Be Naturally Ventilated (Case Study at Ras El Bar, Egypt)","authors":"R. F. Ismail, H. Helal","doi":"10.4028/p-5ckg66","DOIUrl":"https://doi.org/10.4028/p-5ckg66","url":null,"abstract":"Commercial buildings are high energy consumption buildings due to lighting system, cooling, and heating requirements (HVAC) for main corridors, shops, and other services. This research is offering an innovative environmental solution for one floor existing commercial buildings by retrofitting the design to be naturally ventilated which lead to reduce building energy consumption and Co2 production. This Research main concept is ventilating corridors and common spaces at one-floor commercial building naturally and achieving users’ thermal comfort even in the hottest day at summer.Research case study is one-floor existing commercial building in Ras El Bar, Egypt. Building model is constructed in Design Builder software to simulate building energy consumption in the current design as base case and compare different environmental solutions results with it to estimate the energy and Co2 reduction. Also, CFD simulation for different design proposals is simulated to guarantee comfort natural air flow inside the corridors for building users.In addition to visit to building site to measure temperature and wind speed by multi-functional anemometer in many focal points indoor and outdoor the building, to consider any missing data that could affect on the final decision.Finally, after simulating more than one solution, the study present solution that naturally ventilate the on-floor commercial building and achieved users’ thermal comfort at summer.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"19 1","pages":"25 - 35"},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88247102","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}
As climate change effect on our daily life is clear, and the awareness of greenhouse gases damages is increased, architects and many developers necessitate green and sustainable buildings design by focusing on energy efficiency, avoiding harmful materials, and taking care of indoor air quality to construct environmentally friend buildings. Also, adopting energy efficiency strategies and renewable energy applications in buildings design generally and particularly in commercial buildings will drop the produced amount of CO2 emissions, as well as operational emissions and embodied emissions are attributed to the building materials and energy required for construction.This research is proposing energy efficient commercial building design proposal as an approach to green architecture in Egypt. First, commercial buildings impact is studied, then choosing energy simulation tool to assess the solution as DesignBuilder software, the design of commercial building proposal respect the triple bottom line of sustainability, to introduce innovative, efficient and environmental building design respecting users’ needs and achieve high economic value, finally, after simulating the building model in DesignBuilder to reach the highest energy saving and ensure the thermal comfort for users, the design is evaluated by LEED criteria to measure the environmental impact of the building and indicate how this design is successful or not.Finally, this research focuses on proposing a design design cliteria and apply it on designing new commercial buildings to enhance the building performance and being environmentally integrated based on design design cliteria that represent the three major design principles and they are Nature, Culture and Art. Nature for respecting and integrating with the environment, Culture for respecting the location and user’s needs, Art for offering a unique architecture design leave strong mental image impression.
{"title":"Design Criteria for Designing Sustainable Commercial Buildings in Hot and Arid Climate","authors":"H. Helal, R. Ismail","doi":"10.4028/p-pu8022","DOIUrl":"https://doi.org/10.4028/p-pu8022","url":null,"abstract":"As climate change effect on our daily life is clear, and the awareness of greenhouse gases damages is increased, architects and many developers necessitate green and sustainable buildings design by focusing on energy efficiency, avoiding harmful materials, and taking care of indoor air quality to construct environmentally friend buildings. Also, adopting energy efficiency strategies and renewable energy applications in buildings design generally and particularly in commercial buildings will drop the produced amount of CO2 emissions, as well as operational emissions and embodied emissions are attributed to the building materials and energy required for construction.This research is proposing energy efficient commercial building design proposal as an approach to green architecture in Egypt. First, commercial buildings impact is studied, then choosing energy simulation tool to assess the solution as DesignBuilder software, the design of commercial building proposal respect the triple bottom line of sustainability, to introduce innovative, efficient and environmental building design respecting users’ needs and achieve high economic value, finally, after simulating the building model in DesignBuilder to reach the highest energy saving and ensure the thermal comfort for users, the design is evaluated by LEED criteria to measure the environmental impact of the building and indicate how this design is successful or not.Finally, this research focuses on proposing a design design cliteria and apply it on designing new commercial buildings to enhance the building performance and being environmentally integrated based on design design cliteria that represent the three major design principles and they are Nature, Culture and Art. Nature for respecting and integrating with the environment, Culture for respecting the location and user’s needs, Art for offering a unique architecture design leave strong mental image impression.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"201 1","pages":"15 - 23"},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74534707","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}
Structural Health Monitoring (SHM) is now a fundamental idea in our daily lives. It is related to many disciplines, including Civil Engineering, Aerospace Engineering, Mechanical Engineering, and Marine Engineering, among others. It provides a diagnosis of the structure's state at every moment of its residual life, improves understanding of structural behavior, and detects any change that occurs to any component of it or for the entire structure via some devices (Sensors) that may be wired or wireless, incorporating micro and nanotechnology in their components putting on it or on the part under study. These sensors are data collectors that send data to a laptop or computer for processing via a communication system. These data assist decision-makers in determining the structure's residual life and whether it requires maintenance or rebuilding. The wireless SHM system of a Tahya Masr cable-stayed bridge is developed in this study using Resensys SenSpotTM Sensors. The following approaches are suggested to achieve the goal. Wireless sensors were used to measure strain and monitor vibration, strain, inclination, tilt, temperature, and humidity. These measurements help to develop a reference data set that can be used to monitor and detect changes in structural behavior that indicate damage. This study successfully assessed the viability of Resensys SenSpotTM wireless, and it provided a brief overview of vibration- and impedance-based SHM techniques appropriate for the cable-stayed bridge's pylon system. Finally, the Tahya Masr cable-stayed bridge in Egypt served as a successful test site for the smart sensor's applicability.
{"title":"SHM of Tahya Masr Cable-Stayed Bridge Using Resensys Wireless Sensors","authors":"A. Elbaz, K. Heiza, H. Marzouk, O. Nawawy","doi":"10.4028/p-h2v68a","DOIUrl":"https://doi.org/10.4028/p-h2v68a","url":null,"abstract":"Structural Health Monitoring (SHM) is now a fundamental idea in our daily lives. It is related to many disciplines, including Civil Engineering, Aerospace Engineering, Mechanical Engineering, and Marine Engineering, among others. It provides a diagnosis of the structure's state at every moment of its residual life, improves understanding of structural behavior, and detects any change that occurs to any component of it or for the entire structure via some devices (Sensors) that may be wired or wireless, incorporating micro and nanotechnology in their components putting on it or on the part under study. These sensors are data collectors that send data to a laptop or computer for processing via a communication system. These data assist decision-makers in determining the structure's residual life and whether it requires maintenance or rebuilding. The wireless SHM system of a Tahya Masr cable-stayed bridge is developed in this study using Resensys SenSpotTM Sensors. The following approaches are suggested to achieve the goal. Wireless sensors were used to measure strain and monitor vibration, strain, inclination, tilt, temperature, and humidity. These measurements help to develop a reference data set that can be used to monitor and detect changes in structural behavior that indicate damage. This study successfully assessed the viability of Resensys SenSpotTM wireless, and it provided a brief overview of vibration- and impedance-based SHM techniques appropriate for the cable-stayed bridge's pylon system. Finally, the Tahya Masr cable-stayed bridge in Egypt served as a successful test site for the smart sensor's applicability.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"26 1","pages":"37 - 49"},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82259792","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}
One possible method for strengthening deteriorated concrete structures is to externally bond composite material plates to the concrete. The use of Carbon Fiber Reinforced Polymer (CFRP) laminates as an effective and versatile technique for strengthening reinforced concrete (RC) structures has developed into a sizable industry in recent years. To implement such rehabilitation, the nature of the bond between the composite plate and the concrete must be understood. The behavior of reinforced concrete beams strengthened in the negative moment region using CFRP strips is presented in this paper. The experimental program included strengthening and testing five half-scale, reinforced, simply supported rectangular cross section beams with an overhanging (cantilever) portion. One of the tested specimens was tested without any strengthening and considered as the control specimen. The rest specimens were strengthened with CFRP strips using different technique and then tested until complete failure. The effect of strengthening technique on deflection, failure load, strain, failure mode, and ductility are discussed. In addition, and due to local stress concentration at the plate ends, the influence of different type of CFRP fixation at both ends for proper bonding of the strips, and the strengthening pattern on the behavior of beams was examined. The ratio of absorbed energy at failure to total energy, or energy ratio, was used as a measure of beam ductility. The results generally indicate that the flexural strength of the strengthened beams is increased. It is also noted that, in addition to the longitudinal CFRP plates, the fiber oriented in the vertical direction forming a C or U-shape around the beam cross section significantly reduce beam deflections and increase beam load carrying capacity. However, all the strengthened beams experienced semi brittle failure, mandating a higher factor of safety in design. The results also indicate that plating reduced crack size in the beams and somewhat reduced their ductility.
{"title":"Behavior of Reinforced Concrete Beams Strengthened in Negative Moment Region Using CFRP Plates","authors":"Salah Abdel Gawad Aly","doi":"10.4028/p-08537a","DOIUrl":"https://doi.org/10.4028/p-08537a","url":null,"abstract":"One possible method for strengthening deteriorated concrete structures is to externally bond composite material plates to the concrete. The use of Carbon Fiber Reinforced Polymer (CFRP) laminates as an effective and versatile technique for strengthening reinforced concrete (RC) structures has developed into a sizable industry in recent years. To implement such rehabilitation, the nature of the bond between the composite plate and the concrete must be understood. The behavior of reinforced concrete beams strengthened in the negative moment region using CFRP strips is presented in this paper. The experimental program included strengthening and testing five half-scale, reinforced, simply supported rectangular cross section beams with an overhanging (cantilever) portion. One of the tested specimens was tested without any strengthening and considered as the control specimen. The rest specimens were strengthened with CFRP strips using different technique and then tested until complete failure. The effect of strengthening technique on deflection, failure load, strain, failure mode, and ductility are discussed. In addition, and due to local stress concentration at the plate ends, the influence of different type of CFRP fixation at both ends for proper bonding of the strips, and the strengthening pattern on the behavior of beams was examined. The ratio of absorbed energy at failure to total energy, or energy ratio, was used as a measure of beam ductility. The results generally indicate that the flexural strength of the strengthened beams is increased. It is also noted that, in addition to the longitudinal CFRP plates, the fiber oriented in the vertical direction forming a C or U-shape around the beam cross section significantly reduce beam deflections and increase beam load carrying capacity. However, all the strengthened beams experienced semi brittle failure, mandating a higher factor of safety in design. The results also indicate that plating reduced crack size in the beams and somewhat reduced their ductility.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"42 1","pages":"1 - 14"},"PeriodicalIF":0.0,"publicationDate":"2023-06-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80839343","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}
Danielyn F. Plazos, Allan Brian I. Cabisay, Rommel C. Ongcay, Rydell Reade A. Peramide
The Philippines is hit by different calamities and is considered one of the world's most disaster-prone countries, regularly ranking in the top three countries hit most by natural catastrophes. Foldable shelters provide private and secure living spaces for persons forced to leave or lose their usual housing due to a calamity. This study aimed to design a lightweight steel-framed temporary shelter that can withstand typhoon calamities and follows the design requirements mandated by the National Building Code and National Structural Code of the Philippines. The shelter's design concept emphasized its expandability, allowing it to accommodate one family of 4-5 persons. It also is designed to be deploy easily, safe, and efficient in post-disaster settings. The major factors considered when developing the shelter are the ease of assembly process, a compact and flexible structure, and adaptability to rapidly changing conditions. The structural analysis indicates that it can withstand a typhoon with an average wind speed of 220 kph but will fail in a super typhoon like Haiyan, with an average wind speed of 250 kph. Since this shelter is designed for temporary uses, the maximum wind capacity of 220 kph is acceptable and can be a reasonable basis for using these to replace other shelters.
{"title":"Design of Foldable Shelter for Post-Disaster Response","authors":"Danielyn F. Plazos, Allan Brian I. Cabisay, Rommel C. Ongcay, Rydell Reade A. Peramide","doi":"10.4028/p-68d3t1","DOIUrl":"https://doi.org/10.4028/p-68d3t1","url":null,"abstract":"The Philippines is hit by different calamities and is considered one of the world's most disaster-prone countries, regularly ranking in the top three countries hit most by natural catastrophes. Foldable shelters provide private and secure living spaces for persons forced to leave or lose their usual housing due to a calamity. This study aimed to design a lightweight steel-framed temporary shelter that can withstand typhoon calamities and follows the design requirements mandated by the National Building Code and National Structural Code of the Philippines. The shelter's design concept emphasized its expandability, allowing it to accommodate one family of 4-5 persons. It also is designed to be deploy easily, safe, and efficient in post-disaster settings. The major factors considered when developing the shelter are the ease of assembly process, a compact and flexible structure, and adaptability to rapidly changing conditions. The structural analysis indicates that it can withstand a typhoon with an average wind speed of 220 kph but will fail in a super typhoon like Haiyan, with an average wind speed of 250 kph. Since this shelter is designed for temporary uses, the maximum wind capacity of 220 kph is acceptable and can be a reasonable basis for using these to replace other shelters.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"5 1","pages":"47 - 52"},"PeriodicalIF":0.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81044728","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}
Natural fiber as a fiber reinforcement enhances the high-performance cement composites' strength, ductility, and durability requirements for a concrete application. This study aims to utilize an indigenous natural fiber-silica composite as an additive to cement. Pre-treated durian fibers extracted from durian rinds (100 mesh) were mixed with sodium metasilicate (Na2SiO3), and the synthesized durian rind fiber-silica composite (DRFC) was utilized as a cement mass replacement (5% w/w) on concrete to test its effect to mechanical properties. SEM-EDX micrographs show that silica has a rough sheet-like morphology similar to DRFC. However, DRFC also contains a rough fibrous structure indicating the uniformly distributed durian rinds fiber (DRF) present in the composite matrix. Additionally, the presence of silica significantly improves the thermal stability of DRF. Results demonstrated that both concrete with DRF and DRFC additives have superior mechanical properties, surpassing the controlled specimens. Hence, the potential application of DRF to concrete demonstrates a viable upcycling route for durian rinds waste.
{"title":"Synthesis of Durian (Durio Zibethinus) Rinds Fiber-Silica Composite as Concrete Additive","authors":"James Mark M. Gallawan, Chosel P. Lawagon","doi":"10.4028/p-06z22m","DOIUrl":"https://doi.org/10.4028/p-06z22m","url":null,"abstract":"Natural fiber as a fiber reinforcement enhances the high-performance cement composites' strength, ductility, and durability requirements for a concrete application. This study aims to utilize an indigenous natural fiber-silica composite as an additive to cement. Pre-treated durian fibers extracted from durian rinds (100 mesh) were mixed with sodium metasilicate (Na2SiO3), and the synthesized durian rind fiber-silica composite (DRFC) was utilized as a cement mass replacement (5% w/w) on concrete to test its effect to mechanical properties. SEM-EDX micrographs show that silica has a rough sheet-like morphology similar to DRFC. However, DRFC also contains a rough fibrous structure indicating the uniformly distributed durian rinds fiber (DRF) present in the composite matrix. Additionally, the presence of silica significantly improves the thermal stability of DRF. Results demonstrated that both concrete with DRF and DRFC additives have superior mechanical properties, surpassing the controlled specimens. Hence, the potential application of DRF to concrete demonstrates a viable upcycling route for durian rinds waste.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"18 1","pages":"27 - 34"},"PeriodicalIF":0.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89368011","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}
Jazth D. Manota, Roumel Salvador Alvarez, Chosel P. Lawagon
Concrete is extremely vulnerable to crack formation. However, repair and monitoring can be labor-intensive and costly. The investigation focused on the augmentation of natural fiber-silica composite-containing concrete’s mechanical properties. Raw coconut husk fiber (CHF) was used to mix with sodium metasilicate, and the synthesized coir-silica composite (CSC) was mixed in a cementitious matrix to test its self-healing properties. The synthesized composite (CSC) has a sheet-like morphology, whereas the silica has a rough surface morphology based on the SEM-EDX micrographs. The presence of silica improved the thermal stability of the raw coconut husk fiber (CHF). Results demonstrated that both pristine condition and healed samples had enhanced mechanical properties with the addition of the CSC material. Hence, the produced composite embedded in concrete surpassed control specimens in terms of healing capability for compressive and tensile strengths after damage. Finally, a synthesis method was developed to prepare a coconut husk fiber-silica composite, demonstrating a viable upcycling route for coconut husks waste utilization.
{"title":"Synthesis of Coconut (Cocos nucifera) Husk Fiber-Silica Composite as Concrete Additive","authors":"Jazth D. Manota, Roumel Salvador Alvarez, Chosel P. Lawagon","doi":"10.4028/p-1g5356","DOIUrl":"https://doi.org/10.4028/p-1g5356","url":null,"abstract":"Concrete is extremely vulnerable to crack formation. However, repair and monitoring can be labor-intensive and costly. The investigation focused on the augmentation of natural fiber-silica composite-containing concrete’s mechanical properties. Raw coconut husk fiber (CHF) was used to mix with sodium metasilicate, and the synthesized coir-silica composite (CSC) was mixed in a cementitious matrix to test its self-healing properties. The synthesized composite (CSC) has a sheet-like morphology, whereas the silica has a rough surface morphology based on the SEM-EDX micrographs. The presence of silica improved the thermal stability of the raw coconut husk fiber (CHF). Results demonstrated that both pristine condition and healed samples had enhanced mechanical properties with the addition of the CSC material. Hence, the produced composite embedded in concrete surpassed control specimens in terms of healing capability for compressive and tensile strengths after damage. Finally, a synthesis method was developed to prepare a coconut husk fiber-silica composite, demonstrating a viable upcycling route for coconut husks waste utilization.","PeriodicalId":10603,"journal":{"name":"Construction Technologies and Architecture","volume":"22 1","pages":"19 - 26"},"PeriodicalIF":0.0,"publicationDate":"2023-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79581593","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}
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