Pub Date : 2023-02-13DOI: 10.1590/1517-7076-rmat-2022-0256
W. Qiao, Long Fu, Xiuli Sun, Bin Yu, Peng Yang, Yi Pan, L. Tong
The selection of key additive materials for a new type of oil-based drilling fluid was studied in this paper. The oil-based drilling fluid can strengthen well walls and ensure safety. It is suitable for high-temperature and high-pressure wells, deep wells and ultra-deep wells. A new type of high-temperature white oil-based drilling fluid was prepared by using 5# white oil as continuous phase, HIS as thickening agent, SDBS as emulsifier
{"title":"Selection of key additive materials for white oil – based drilling fluids","authors":"W. Qiao, Long Fu, Xiuli Sun, Bin Yu, Peng Yang, Yi Pan, L. Tong","doi":"10.1590/1517-7076-rmat-2022-0256","DOIUrl":"https://doi.org/10.1590/1517-7076-rmat-2022-0256","url":null,"abstract":"The selection of key additive materials for a new type of oil-based drilling fluid was studied in this paper. The oil-based drilling fluid can strengthen well walls and ensure safety. It is suitable for high-temperature and high-pressure wells, deep wells and ultra-deep wells. A new type of high-temperature white oil-based drilling fluid was prepared by using 5# white oil as continuous phase, HIS as thickening agent, SDBS as emulsifier","PeriodicalId":18246,"journal":{"name":"Matéria (Rio de Janeiro)","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85320497","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}
Pub Date : 2023-02-13DOI: 10.1590/1517-7076-rmat-2022-0328
Elias de Souza Gorayeb Junior, O. Fernandez, L. Gomes, Wander Alex Pereira Costa, P. S. S. Gorayeb
Brazil has immense potential in the production of quartz and its gem varieties, consequently generating huge amounts of waste. This research aims to utilize the amethyst quartz tailings from the Alto Bonito mine-Brazil accumulated for decades in waste dumps, through a specific study of cementitious mortar production, consider - ing the mineralogical and chemical characterization; evaluation the use of tailings as a fine aggregate for mortar production; estimate the technical feasibility through mechanical tests and; characterize of specimens by SEM after breakage. The tailings are quartz associated with mica. Quartz is polycrystalline with medium to fine grain, being SiO 2 the main component. The comminuted tailings showed a very fine fineness modulus, affecting the formulations. With cement:tailings (1:3) traces the mechanical tests show 5.65 Mpa and 1.05 Mpa to compressive and flexural strength respectively, slightly below the reference. The fine-sized and metamorphic morphology of the tailings affects the mechanical strength of the mortar. The process adopted in the production of mortars with total replacement of the fine aggregate have a great impact contributing to the reduction of waste in dumps, minimizing the environmental impact of mining, in addition to benefiting the Amethyst Miners Cooperative.
{"title":"Amethyst quartz tailings in cement mortars production","authors":"Elias de Souza Gorayeb Junior, O. Fernandez, L. Gomes, Wander Alex Pereira Costa, P. S. S. Gorayeb","doi":"10.1590/1517-7076-rmat-2022-0328","DOIUrl":"https://doi.org/10.1590/1517-7076-rmat-2022-0328","url":null,"abstract":"Brazil has immense potential in the production of quartz and its gem varieties, consequently generating huge amounts of waste. This research aims to utilize the amethyst quartz tailings from the Alto Bonito mine-Brazil accumulated for decades in waste dumps, through a specific study of cementitious mortar production, consider - ing the mineralogical and chemical characterization; evaluation the use of tailings as a fine aggregate for mortar production; estimate the technical feasibility through mechanical tests and; characterize of specimens by SEM after breakage. The tailings are quartz associated with mica. Quartz is polycrystalline with medium to fine grain, being SiO 2 the main component. The comminuted tailings showed a very fine fineness modulus, affecting the formulations. With cement:tailings (1:3) traces the mechanical tests show 5.65 Mpa and 1.05 Mpa to compressive and flexural strength respectively, slightly below the reference. The fine-sized and metamorphic morphology of the tailings affects the mechanical strength of the mortar. The process adopted in the production of mortars with total replacement of the fine aggregate have a great impact contributing to the reduction of waste in dumps, minimizing the environmental impact of mining, in addition to benefiting the Amethyst Miners Cooperative.","PeriodicalId":18246,"journal":{"name":"Matéria (Rio de Janeiro)","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79057222","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}
Pub Date : 2023-02-13DOI: 10.1590/1517-7076-rmat-2022-0291
Laíze Jorge da Costa, Edgley Alves de Oliveira Paula, R. Melo, M. V. Scatolino, Felipe Bento de Albuquerque, Ramona Rodrigues Amaro de Oliveira, Joana Alice Galdino de Souza, Ana Karla Vieira da Silva, Márcia Ellen Chagas dos Santos, Francisco Rodolfo Junior
The attempt to face the limitations of wood-based materials, especially concerning the relationship with water, is still a considerable gap in research on this subject. The present work proposes the accomplishment of thermal treatment in fiberboard-type hardboard, using different temperatures and times, to evaluate the effect on the physical-mechanical properties. The parameters of the heat treatment were temperatures of 120 and 160 °C and times of 20 and 40 min. The hardboards were individually heat treated in a kiln. The characterization was performed from physical tests such as bulk density, moisture content, water absorption (2 and 24 h), thickness swelling (2 and 24 h); and mechanical properties of flexural strength. The treatment with a temperature of 160 °C for 40 min showed the lowest values of water absorption in 24 h (34%). Thickness swelling was lower compared to control, for all the treatments applied. Regarding flexural strength, the treatment that adopted the 160 °C for 20 min showed the highest MOR value (26.3 MPa). In general, the performance of heat treatments positively influenced the physical and mechanical properties of the hardboards, being an interesting alternative in the development of products for applications in internal environments.
{"title":"Improvement of the properties of hardboard with heat treatment application","authors":"Laíze Jorge da Costa, Edgley Alves de Oliveira Paula, R. Melo, M. V. Scatolino, Felipe Bento de Albuquerque, Ramona Rodrigues Amaro de Oliveira, Joana Alice Galdino de Souza, Ana Karla Vieira da Silva, Márcia Ellen Chagas dos Santos, Francisco Rodolfo Junior","doi":"10.1590/1517-7076-rmat-2022-0291","DOIUrl":"https://doi.org/10.1590/1517-7076-rmat-2022-0291","url":null,"abstract":"The attempt to face the limitations of wood-based materials, especially concerning the relationship with water, is still a considerable gap in research on this subject. The present work proposes the accomplishment of thermal treatment in fiberboard-type hardboard, using different temperatures and times, to evaluate the effect on the physical-mechanical properties. The parameters of the heat treatment were temperatures of 120 and 160 °C and times of 20 and 40 min. The hardboards were individually heat treated in a kiln. The characterization was performed from physical tests such as bulk density, moisture content, water absorption (2 and 24 h), thickness swelling (2 and 24 h); and mechanical properties of flexural strength. The treatment with a temperature of 160 °C for 40 min showed the lowest values of water absorption in 24 h (34%). Thickness swelling was lower compared to control, for all the treatments applied. Regarding flexural strength, the treatment that adopted the 160 °C for 20 min showed the highest MOR value (26.3 MPa). In general, the performance of heat treatments positively influenced the physical and mechanical properties of the hardboards, being an interesting alternative in the development of products for applications in internal environments.","PeriodicalId":18246,"journal":{"name":"Matéria (Rio de Janeiro)","volume":"18 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85650326","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}
Pub Date : 2023-02-10DOI: 10.1590/1517-7076-rmat-2022-0305
Elisa Gombio Rocha, Maria Gabriela Galvão Camarinha, Danieli Aparecida Pereira Reis
RESUMO Este trabalho avaliou o comportamento de fratura da liga de alumínio AA7075-T6 submetida a carregamento de fadiga. Ambos os corpos de prova entalhados e não entalhados foram submetidos a um tratamento térmico de retrogression and re-aging (RRA) e nitretação a plasma antes dos ensaios mecânicos. A nitretação a plasma, que tem sido um método escolhido para aumentar a dureza superficial e as resistências à fadiga, desgaste e corrosão de diversas ligas, foi realizada com tela ativa com fonte DC de 20 Hz e ciclo de trabalho de 40 Hz. O tratamento RRA, que é utilizado para aumentar a resistência e a dureza da liga de alumínio AA7075 e obter melhorias nos comportamentos de fadiga e corrosão, foi realizado a 200 °C por 20 minutos com resfriamento a água (resolubilização), seguido de 24 horas a 120 °C (reenvelhecimento). Os ensaios de fadiga axial de corpos de prova entalhados e não entalhados foram realizados com R = 0,1, frequência de 14 Hz, e em nível de tensão de 150 MPa para corpos de prova entalhados e 500 MPa para corpos de prova não entalhados. A fratura por fadiga foi então realizada via estereomicroscopia e microscopia eletrônica de varredura. Para os corpos de prova não entalhados, as condições AA7075-T6 e AA7075-RRA apresentaram características de fratura semelhantes, com boa definição dos três estágios de falha por fadiga; a condição nitretada AA7075 não apresentou evidência de fratura por fadiga típica. Os corpos de prova entalhados apresentaram fractografias semelhantes à condição de concentração de tensão severa, com marcas superficiais convexas à região de nucleação.
{"title":"Análise fractográfica da liga AA 7075-T6 submetida à fadiga na condição de tratamento RRA e nitretada a plasma","authors":"Elisa Gombio Rocha, Maria Gabriela Galvão Camarinha, Danieli Aparecida Pereira Reis","doi":"10.1590/1517-7076-rmat-2022-0305","DOIUrl":"https://doi.org/10.1590/1517-7076-rmat-2022-0305","url":null,"abstract":"RESUMO Este trabalho avaliou o comportamento de fratura da liga de alumínio AA7075-T6 submetida a carregamento de fadiga. Ambos os corpos de prova entalhados e não entalhados foram submetidos a um tratamento térmico de retrogression and re-aging (RRA) e nitretação a plasma antes dos ensaios mecânicos. A nitretação a plasma, que tem sido um método escolhido para aumentar a dureza superficial e as resistências à fadiga, desgaste e corrosão de diversas ligas, foi realizada com tela ativa com fonte DC de 20 Hz e ciclo de trabalho de 40 Hz. O tratamento RRA, que é utilizado para aumentar a resistência e a dureza da liga de alumínio AA7075 e obter melhorias nos comportamentos de fadiga e corrosão, foi realizado a 200 °C por 20 minutos com resfriamento a água (resolubilização), seguido de 24 horas a 120 °C (reenvelhecimento). Os ensaios de fadiga axial de corpos de prova entalhados e não entalhados foram realizados com R = 0,1, frequência de 14 Hz, e em nível de tensão de 150 MPa para corpos de prova entalhados e 500 MPa para corpos de prova não entalhados. A fratura por fadiga foi então realizada via estereomicroscopia e microscopia eletrônica de varredura. Para os corpos de prova não entalhados, as condições AA7075-T6 e AA7075-RRA apresentaram características de fratura semelhantes, com boa definição dos três estágios de falha por fadiga; a condição nitretada AA7075 não apresentou evidência de fratura por fadiga típica. Os corpos de prova entalhados apresentaram fractografias semelhantes à condição de concentração de tensão severa, com marcas superficiais convexas à região de nucleação.","PeriodicalId":18246,"journal":{"name":"Matéria (Rio de Janeiro)","volume":"34 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79513320","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}
Pub Date : 2023-02-10DOI: 10.1590/1517-7076-rmat-2022-0300
Jesudhas Prakash Arul Jose, Mahmoud Al Khazaleh, F. Prakash, F. Raj
This research mainly focuses on the nature of Fiber-Reinforced Polymers (FRP) wrapped piles for the axial compression load. Normally, the degradation of Reinforced Cement Concrete (RCC) structures occurred due to corrosion, inadequate quality materials, aging, live load increments, fatigue, damages and deterioration, and so forth. RCC pile foundations are commonly affected by the above reasons. So, these structures can be strengthened with suitable methods such as jacketing, stitching, overlaying, sealing, grouting, coating, Near Surface Mounted (NSM) systems, FRP wrapping, repairing, and blanketing. FRP wrapping is well suited for strengthening pile structures because of its easy application, and this method is done without using heavy tools and skilled labor. Due to its being non-metallic, FRP reinforcing has desirable properties such as high resistance to chemicals as well as heat, flexibility, large tensile strength, permeability, and also no oxidation. Thus, FRP wrapping was selected as the chosen approach for this ongoing research. In this study, we apply an axial compression load as well as a skin friction condition to a pile member that has been modified to assess its performance and behavior.
{"title":"Experimental study of reinforced concrete piles wrapped with fibre reinforced polymer under vertical load","authors":"Jesudhas Prakash Arul Jose, Mahmoud Al Khazaleh, F. Prakash, F. Raj","doi":"10.1590/1517-7076-rmat-2022-0300","DOIUrl":"https://doi.org/10.1590/1517-7076-rmat-2022-0300","url":null,"abstract":"This research mainly focuses on the nature of Fiber-Reinforced Polymers (FRP) wrapped piles for the axial compression load. Normally, the degradation of Reinforced Cement Concrete (RCC) structures occurred due to corrosion, inadequate quality materials, aging, live load increments, fatigue, damages and deterioration, and so forth. RCC pile foundations are commonly affected by the above reasons. So, these structures can be strengthened with suitable methods such as jacketing, stitching, overlaying, sealing, grouting, coating, Near Surface Mounted (NSM) systems, FRP wrapping, repairing, and blanketing. FRP wrapping is well suited for strengthening pile structures because of its easy application, and this method is done without using heavy tools and skilled labor. Due to its being non-metallic, FRP reinforcing has desirable properties such as high resistance to chemicals as well as heat, flexibility, large tensile strength, permeability, and also no oxidation. Thus, FRP wrapping was selected as the chosen approach for this ongoing research. In this study, we apply an axial compression load as well as a skin friction condition to a pile member that has been modified to assess its performance and behavior.","PeriodicalId":18246,"journal":{"name":"Matéria (Rio de Janeiro)","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86691185","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}
Pub Date : 2023-02-06DOI: 10.1590/1517-7076-rmat-2022-0254
Carolina Goulart Bezerra, Solanda Oliveira, N. P. Hasparyk, M’hamed Yassin Rajiv da Gloria, Daniel de Oliveira Santos, Alexandre de Castro Pereira, Vivian Karla Castelo Branco Louback Machado Balthar, Romildo Dias Tolêdo Filho
RESUMO Esta pesquisa experimental tem como objetivo produzir bioconcretos de casca de arroz (BCCs) com uma matriz de misturas ternárias de cimento, cinza da casca de arroz e cinza volante. A primeira etapa consistiu na avaliação da influência de um aditivo superplastificante e um aditivo polifuncional no comportamento reológico de pastas cimentícias. O objetivo dessa etapa foi testar diferentes teores dos aditivos a fim de desenvolver uma pasta fluida que, após a adição de altas frações volumétricas de casca de arroz (CA), permita obter BCCs leves que possuam trabalhabilidade adequada para adensamento por vibração mecânica. Realizou-se uma trituração e um tratamento químico da CA, no intuito de melhorar sua aderência com a matriz. Os resultados experimentais mostram que o aditivo do tipo PF apresentou melhor compatibilidade com a matriz a um teor de 0,3%. Assim, os BCCs produzidos apresentaram-se coesos e sem segregação, com espalhamento de 210 ± 30 mm. A massa específica seca e a resistência à compressão foram determinadas aos 28 dias de idade. Com os resultados obtidos, os BCCs apresentaram massa específica entre 1000 e 1300 kg/m3 e resistência à compressão superiores a 8,0 MPa, indicando a possibilidade de utilização na produção de painéis leves e autoportantes.
{"title":"Caracterização reológica de pastas ternárias para o desenvolvimento de bioconcretos leves de casca de arroz","authors":"Carolina Goulart Bezerra, Solanda Oliveira, N. P. Hasparyk, M’hamed Yassin Rajiv da Gloria, Daniel de Oliveira Santos, Alexandre de Castro Pereira, Vivian Karla Castelo Branco Louback Machado Balthar, Romildo Dias Tolêdo Filho","doi":"10.1590/1517-7076-rmat-2022-0254","DOIUrl":"https://doi.org/10.1590/1517-7076-rmat-2022-0254","url":null,"abstract":"RESUMO Esta pesquisa experimental tem como objetivo produzir bioconcretos de casca de arroz (BCCs) com uma matriz de misturas ternárias de cimento, cinza da casca de arroz e cinza volante. A primeira etapa consistiu na avaliação da influência de um aditivo superplastificante e um aditivo polifuncional no comportamento reológico de pastas cimentícias. O objetivo dessa etapa foi testar diferentes teores dos aditivos a fim de desenvolver uma pasta fluida que, após a adição de altas frações volumétricas de casca de arroz (CA), permita obter BCCs leves que possuam trabalhabilidade adequada para adensamento por vibração mecânica. Realizou-se uma trituração e um tratamento químico da CA, no intuito de melhorar sua aderência com a matriz. Os resultados experimentais mostram que o aditivo do tipo PF apresentou melhor compatibilidade com a matriz a um teor de 0,3%. Assim, os BCCs produzidos apresentaram-se coesos e sem segregação, com espalhamento de 210 ± 30 mm. A massa específica seca e a resistência à compressão foram determinadas aos 28 dias de idade. Com os resultados obtidos, os BCCs apresentaram massa específica entre 1000 e 1300 kg/m3 e resistência à compressão superiores a 8,0 MPa, indicando a possibilidade de utilização na produção de painéis leves e autoportantes.","PeriodicalId":18246,"journal":{"name":"Matéria (Rio de Janeiro)","volume":"67 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85325449","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}
Pub Date : 2023-02-06DOI: 10.1590/1517-7076-rmat-2022-0244
Ana Luíza Freitas Ferreira, Kimberly Paim Abeyta, Jordan Gonzaga Andrade Batista Silva, R. C. Santos, Luiz Antônio Magalhães Pontes
Glycerol has applications as a raw material in different industrial processes, however, its supply exceeds demand. An alternative to increase the added value of this feedstock is its conversion into high added-value chemical products through dehydration and hydrogenation reactions, from which 1,2-PDO and 1,3-PDO can be obtained. To develop catalysts that increase the conversion and selectivity of these processes, materials of 2% Pt and 10% WO 3 supported on SBA-15 were studied. Two methods were used for incipient wetness impregnation: sequential impregnation, with impregnation steps for each species, and co-impregnation, with a single impregnation step for both species. From the analysis of XRD, XRF, N 2 isotherms, SEM, EDS, FTIR, and pyridine FTIR spectroscopy, it was possible to observe the influence of these methods on the structural and textural properties. It was verified that the co-impregnation provided a better dispersion of the WO 3 species on the surface of the SBA-15 and that the reduction process, for both methodologies employed, showed an improvement in the metallic dispersion. The better dispersion of WO 3 species also resulted in a greater formation of Brønsted acid sites for the co-impregnation method, with a predominance of Lewis sites in the structure of the catalysts obtained by both methods.
{"title":"Methods for Pt-WO3/SBA-15 materials synthesis for glycerol conversion","authors":"Ana Luíza Freitas Ferreira, Kimberly Paim Abeyta, Jordan Gonzaga Andrade Batista Silva, R. C. Santos, Luiz Antônio Magalhães Pontes","doi":"10.1590/1517-7076-rmat-2022-0244","DOIUrl":"https://doi.org/10.1590/1517-7076-rmat-2022-0244","url":null,"abstract":"Glycerol has applications as a raw material in different industrial processes, however, its supply exceeds demand. An alternative to increase the added value of this feedstock is its conversion into high added-value chemical products through dehydration and hydrogenation reactions, from which 1,2-PDO and 1,3-PDO can be obtained. To develop catalysts that increase the conversion and selectivity of these processes, materials of 2% Pt and 10% WO 3 supported on SBA-15 were studied. Two methods were used for incipient wetness impregnation: sequential impregnation, with impregnation steps for each species, and co-impregnation, with a single impregnation step for both species. From the analysis of XRD, XRF, N 2 isotherms, SEM, EDS, FTIR, and pyridine FTIR spectroscopy, it was possible to observe the influence of these methods on the structural and textural properties. It was verified that the co-impregnation provided a better dispersion of the WO 3 species on the surface of the SBA-15 and that the reduction process, for both methodologies employed, showed an improvement in the metallic dispersion. The better dispersion of WO 3 species also resulted in a greater formation of Brønsted acid sites for the co-impregnation method, with a predominance of Lewis sites in the structure of the catalysts obtained by both methods.","PeriodicalId":18246,"journal":{"name":"Matéria (Rio de Janeiro)","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82087292","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}
Pub Date : 2023-02-03DOI: 10.1590/1517-7076-rmat-2022-0315
Yesudhas Abisha, N. Nalanth
As concrete being widely used in the field of construction, the demand for the materials used is increased rapidly. To meet the growing demand it is necessary to use alternative materials to meet the requirements. The Pineapple leaf fibre (PALF) is a highly available material in larger quantity with lesser water content and higher fiber content which makes it as a desirable material as natural fibre. The workability characteristics of Self compaction Concrete (SCC) like flowability, filling ability, passing ability, resistance to segregation and bleed - ing of concrete were out by using slump cone, U-box, L-box, V-Funnel and J-ring test. The test result shows satisfactory results on the workability of SCC. The fresh and hardened properties of concrete were found at the ages 7 days, 14 days and 28 days for various addition of PALF and various replacements of granite powder with the fine aggregate. The addition of PALF has achieved maximum compressive strength and split tensile strength in all ages of concrete at PALF0.2. The replacement of granite powder with fine aggregate seems to be promising in achieving the maximum compressive strength and split tensile strength at the 10% of replacement.
{"title":"Pineapple fibre as an additive to self-compacting concrete","authors":"Yesudhas Abisha, N. Nalanth","doi":"10.1590/1517-7076-rmat-2022-0315","DOIUrl":"https://doi.org/10.1590/1517-7076-rmat-2022-0315","url":null,"abstract":"As concrete being widely used in the field of construction, the demand for the materials used is increased rapidly. To meet the growing demand it is necessary to use alternative materials to meet the requirements. The Pineapple leaf fibre (PALF) is a highly available material in larger quantity with lesser water content and higher fiber content which makes it as a desirable material as natural fibre. The workability characteristics of Self compaction Concrete (SCC) like flowability, filling ability, passing ability, resistance to segregation and bleed - ing of concrete were out by using slump cone, U-box, L-box, V-Funnel and J-ring test. The test result shows satisfactory results on the workability of SCC. The fresh and hardened properties of concrete were found at the ages 7 days, 14 days and 28 days for various addition of PALF and various replacements of granite powder with the fine aggregate. The addition of PALF has achieved maximum compressive strength and split tensile strength in all ages of concrete at PALF0.2. The replacement of granite powder with fine aggregate seems to be promising in achieving the maximum compressive strength and split tensile strength at the 10% of replacement.","PeriodicalId":18246,"journal":{"name":"Matéria (Rio de Janeiro)","volume":"146 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75059353","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}
Pub Date : 2023-01-30DOI: 10.1590/1517-7076-rmat-2022-0272
M. Abisha, J. Jose
In this research article, soil stabilisation is carried out by the latest method: nanotechnology. The stabilizer nano-aluminum oxide is used as a stabilising agent in concentrations of 0.2%, 0.4%, 0.6%, 0.8%, 1%, and 1.2%. Because it is 99% pure and nanoscale, it has a large surface area for analysing the properties and strength of soil tests such as Atterberg’s limit, pycnometer, proctor compaction test, California bearing ratio test, and unconfined compressive strength. These tests are done for parent soil and soil with different percentages of nanomaterials. The nanostabilizer addition increases the unconfined compressive strength, California bearing ratio, liquid limit, and optimum moisture content value. One percentage of nano-aluminium oxide is considered an optimum dosage. Beyond the optimum amount, there is a change in soil property. The CBR value, liquid limit, and OMC of soil all go down, so it is recommended to use 1% nano-aluminum oxide to improve sub-grade clay soil.
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Pub Date : 2023-01-30DOI: 10.1590/1517-7076-rmat-2022-0251
Pablo Augusto dos Santos Rocha, Denise de Carvalho Urashima, Mag Geisielly Alves Guimarães
RESUMO A geração de resíduos da construção civil (RCC) e o consumo não racional de agregados naturais (AN) são adversidades enfrentadas no âmbito da Indústria da Construção Civil. Para mitigar este conflito, são investidos esforços, tais como a não geração, a redução, o reuso e a reciclagem, associadas a inserção de produtos não convencionais, como os geossintéticos. A reciclagem e a viabilidade técnica e econômica do emprego de agregados reciclados (AR) tem sido objeto de distintas pesquisas que buscam ampliar a gama de aplicação destes materiais, a fim de atingir aceitação e consolidação no mercado. Na engenharia geotécnica, os AR são empregados em muros de solo reforçado como material de preenchimento de blocos segmentais. Este artigo traz a investigação do emprego de agregados reciclados de concreto (ARCO) como material de preenchimento de blocos segmentais em muros de solo reforçado com geogrelhas (GGR), como proposta de substituição aos AN empregados nesta aplicação. Para tanto, os ARCO e AN na zona granulométrica de 9,5/25 mm (agregados graúdos) foram submetidos a ensaios de caracterização física e ensaios de resistência de conexão sob tensões normais de 40 kN/m2, 50 kN/m2, 60 kN/m2, 80 kN/m2 e 100 kN/m2, a fim de avaliar o desempenho dos elementos de interface quando submetidos à tração. Após a realização dos ensaios de resistência de conexão em equipamento de grande porte, verificou-se que os ARCO são indicados para o emprego como material de preenchimento de blocos segmentais em muros de solo reforçado com GGR de altura não superior a 5 metros. O aumento das tensões normais contribuiu para a redução mais expressiva das características físicas e do desempenho da resistência de conexão dos ARCO em relação aos resultados ensaios com emprego de AN.
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