O presente artigo avaliou a RAA dos agregados utilizados na região metropolitana de Salvador e o uso de adições minerais, a fim de mitigar essa reação. Empregou-se o método acelerado de barras de argamassa, preconizado pela NBR 15577-4: 2008. Os resultados indicam que os agregados miúdos da região metropolitana de Salvador apresentam baixa reatividade, entretanto, os agregados graúdos apresentaram elevada reatividade e que adições minerais com características pozolânicas podem mitigar a RAA. Este estudo, apesar de se limitar às condições utilizadas, é inédito no Estado da Bahia e apresenta elevado índice de originalidade por utilizar teores de adições superiores às convencionais. Concluiu-se neste estudo que a microssílica, se utilizada em teores muito elevados, pode, inclusive, acelerar a reação.
{"title":"Avaliação dos agregados utilizados na região metropolitana de Salvador quanto à ocorrência de Reatividade Álcalis-Agregado (RAA)","authors":"D. V. Ribeiro, Rafaela Oliveira Rey","doi":"10.21041/RA.V9I2.326","DOIUrl":"https://doi.org/10.21041/RA.V9I2.326","url":null,"abstract":"O presente artigo avaliou a RAA dos agregados utilizados na região metropolitana de Salvador e o uso de adições minerais, a fim de mitigar essa reação. Empregou-se o método acelerado de barras de argamassa, preconizado pela NBR 15577-4: 2008. Os resultados indicam que os agregados miúdos da região metropolitana de Salvador apresentam baixa reatividade, entretanto, os agregados graúdos apresentaram elevada reatividade e que adições minerais com características pozolânicas podem mitigar a RAA. Este estudo, apesar de se limitar às condições utilizadas, é inédito no Estado da Bahia e apresenta elevado índice de originalidade por utilizar teores de adições superiores às convencionais. Concluiu-se neste estudo que a microssílica, se utilizada em teores muito elevados, pode, inclusive, acelerar a reação.","PeriodicalId":21260,"journal":{"name":"Revista ALCONPAT","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82732225","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}
Pedro J. Poot Cauich, Rodolfo Martínez-Molina, José Luis Gamboa Marrufo, P. J. Herrera Franco
This paper addresses the mechanics of adhesion, strengthening effect and durability issues of applications of CFRP composite materials in beams. The application of CFRP materials has been widely described, but the main focus has been on overall failure parameters. The first issue is strengthening capability of CFRP reinforcement for concrete beams. The second is the local interface bond stress-slip relationship, that is, the local t-slip. The last issue is the durability of the CFRP sheet/plate, when exposed to a hydro-thermal environment. The role of adhesion and the mechanics of concrete-CFRP adhesion and a sound understanding of the interface between the CFRP and concrete behavior is the key factor for controlling debonding failures in CFRP-strengthened RC beams.
{"title":"Adhesion, strengthening and durability issues in the retrofitting of Reinforced Concrete (RC) beams using Carbon Fiber Reinforced Polymer (CFRP) – A Review","authors":"Pedro J. Poot Cauich, Rodolfo Martínez-Molina, José Luis Gamboa Marrufo, P. J. Herrera Franco","doi":"10.21041/ra.v9i2.401","DOIUrl":"https://doi.org/10.21041/ra.v9i2.401","url":null,"abstract":"This paper addresses the mechanics of adhesion, strengthening effect and durability issues of applications of CFRP composite materials in beams. The application of CFRP materials has been widely described, but the main focus has been on overall failure parameters. The first issue is strengthening capability of CFRP reinforcement for concrete beams. The second is the local interface bond stress-slip relationship, that is, the local t-slip. The last issue is the durability of the CFRP sheet/plate, when exposed to a hydro-thermal environment. The role of adhesion and the mechanics of concrete-CFRP adhesion and a sound understanding of the interface between the CFRP and concrete behavior is the key factor for controlling debonding failures in CFRP-strengthened RC beams.","PeriodicalId":21260,"journal":{"name":"Revista ALCONPAT","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91181522","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}
Allekes Plaza Meurer, R. A. Amorim, L. Quintanilha, Dênis Cardoso Parente
Este trabalho busca avaliar a utilização da água de reuso proveniente de estações de tratamento de esgoto na fabricação de blocos vazados de concreto simples. O uso desses blocos tem sido adotado como opção de racionalização na composição da alvenaria de vedação e estrutural, por permitir redução nas perdas de materiais e camadas de revestimento. Fabricados a partir da mistura de aglomerante, agregado e água, em média 60 m³ de concreto, necessários para produção de 12.350 blocos (14 x 19 x 39 cm), consumiria 4.500 l de água. O estudo compreende a análise das propriedades físicas e mecânicas dos blocos dosados com efluente e os resultados mostram que essas propriedades permanecem inalteradas, o que pode viabilizar a utilização do efluente.
{"title":"Reuso de efluentes na fabricação de blocos de concreto para alvenaria de vedação","authors":"Allekes Plaza Meurer, R. A. Amorim, L. Quintanilha, Dênis Cardoso Parente","doi":"10.21041/RA.V9I2.278","DOIUrl":"https://doi.org/10.21041/RA.V9I2.278","url":null,"abstract":"Este trabalho busca avaliar a utilização da água de reuso proveniente de estações de tratamento de esgoto na fabricação de blocos vazados de concreto simples. O uso desses blocos tem sido adotado como opção de racionalização na composição da alvenaria de vedação e estrutural, por permitir redução nas perdas de materiais e camadas de revestimento. Fabricados a partir da mistura de aglomerante, agregado e água, em média 60 m³ de concreto, necessários para produção de 12.350 blocos (14 x 19 x 39 cm), consumiria 4.500 l de água. O estudo compreende a análise das propriedades físicas e mecânicas dos blocos dosados com efluente e os resultados mostram que essas propriedades permanecem inalteradas, o que pode viabilizar a utilização do efluente.","PeriodicalId":21260,"journal":{"name":"Revista ALCONPAT","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85340143","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}
Juan Carlos Isidro Ramírez Soto, J. Pérez-Quiróz, J. Salgado-López, T. Pérez-López, Mariela Rendón-Belmonte, Erick Álvarez-Alfaro, M. Martínez-Madrid
In this study, the corrosion performance of dissimilar welded joints between ASTM A615 and AISI 304 stainless steel with and without buttering using Inconel 182 was evaluated. In both cases, the filler metal was ER-309L and the base metals were prepared with a 45° single bevel. One half of the specimens were welded with “buttering” using Inconel 182. The electrochemical results showed that despite welding defects, the welded specimens formed a passive layer in alkaline environments. The specimens welded with buttering exhibited the best corrosion resistance and mechanical properties.
{"title":"Electrochemical behavior of dissimilar welded joints between ASTM A615 and AISI 304 with and without buttering using Inconel 182","authors":"Juan Carlos Isidro Ramírez Soto, J. Pérez-Quiróz, J. Salgado-López, T. Pérez-López, Mariela Rendón-Belmonte, Erick Álvarez-Alfaro, M. Martínez-Madrid","doi":"10.21041/RA.V9I2.334","DOIUrl":"https://doi.org/10.21041/RA.V9I2.334","url":null,"abstract":"In this study, the corrosion performance of dissimilar welded joints between ASTM A615 and AISI 304 stainless steel with and without buttering using Inconel 182 was evaluated. In both cases, the filler metal was ER-309L and the base metals were prepared with a 45° single bevel. One half of the specimens were welded with “buttering” using Inconel 182. The electrochemical results showed that despite welding defects, the welded specimens formed a passive layer in alkaline environments. The specimens welded with buttering exhibited the best corrosion resistance and mechanical properties.","PeriodicalId":21260,"journal":{"name":"Revista ALCONPAT","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77035351","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}
Nicolle Christine Sotsek, Drielle Sanchez Leitner, Adriana de Paula Lacerda Santos
O objetivo deste artigo é fornecer, por meio de uma revisão sistemática da literatura focada no controle de qualidade das edificações, um banco de dados para apresentar os critérios mais utilizados pelo Building Performance Evaluation (BPE). Mediante a esta revisão, 782 artigos foram identificados, dos quais 15 foram selecionados considerando aderência do tema a pesquisa e período de publicação. As principais informações sobre os artigos, seus autores e revistas foram debatidas. Os critérios de desempenho compilados pelos artigos analisados utilizaram como base: a literatura, questionários e entrevistas com usuários e profissionais da área, consulta a especialistas do segmento e visitas técnicas as edificações. Com tais critérios identificados foi possível definir 9 dimensões de análise que são apresentadas e discutidas neste documento.
{"title":"Uma revisão sistemática dos critérios do Building Performance Evaluation (BPE)","authors":"Nicolle Christine Sotsek, Drielle Sanchez Leitner, Adriana de Paula Lacerda Santos","doi":"10.21041/RA.V9I1.260","DOIUrl":"https://doi.org/10.21041/RA.V9I1.260","url":null,"abstract":"O objetivo deste artigo é fornecer, por meio de uma revisão sistemática da literatura focada no controle de qualidade das edificações, um banco de dados para apresentar os critérios mais utilizados pelo Building Performance Evaluation (BPE). Mediante a esta revisão, 782 artigos foram identificados, dos quais 15 foram selecionados considerando aderência do tema a pesquisa e período de publicação. As principais informações sobre os artigos, seus autores e revistas foram debatidas. Os critérios de desempenho compilados pelos artigos analisados utilizaram como base: a literatura, questionários e entrevistas com usuários e profissionais da área, consulta a especialistas do segmento e visitas técnicas as edificações. Com tais critérios identificados foi possível definir 9 dimensões de análise que são apresentadas e discutidas neste documento.","PeriodicalId":21260,"journal":{"name":"Revista ALCONPAT","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75907528","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}
R. J. C. Silva, M. Muniz, Ésio Magalhães Feitosa Lima, F. E. S. S. Silva Júnior, Carlos Valbson dos Santos Araújo
This work was aimed at analyzing the efficiency of the strengthening of reinforced concrete beams with the addition of steel bars and epoxy adhesive. Five beams were produced, out of which four beams were strengthened to flexure. In two of them, “U” clips were also used to improve the anchorage of the strengthening. The tests demonstrated that the clips reduced the resistances of the beams compared to those without clips. The strengthened beams without clips yielded better results, but the largest limiting factor was the adherence between the epoxy and beam. The use of clips for solving the problem of adherence made this research original. The conclusions were based on the comparisons of the tested beams.
{"title":"Experimental analysis of reinforced concrete beams strengthened with steel bars and epoxy structural adhesive","authors":"R. J. C. Silva, M. Muniz, Ésio Magalhães Feitosa Lima, F. E. S. S. Silva Júnior, Carlos Valbson dos Santos Araújo","doi":"10.21041/RA.V9I1.213","DOIUrl":"https://doi.org/10.21041/RA.V9I1.213","url":null,"abstract":"This work was aimed at analyzing the efficiency of the strengthening of reinforced concrete beams with the addition of steel bars and epoxy adhesive. Five beams were produced, out of which four beams were strengthened to flexure. In two of them, “U” clips were also used to improve the anchorage of the strengthening. The tests demonstrated that the clips reduced the resistances of the beams compared to those without clips. The strengthened beams without clips yielded better results, but the largest limiting factor was the adherence between the epoxy and beam. The use of clips for solving the problem of adherence made this research original. The conclusions were based on the comparisons of the tested beams. ","PeriodicalId":21260,"journal":{"name":"Revista ALCONPAT","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90229571","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}
Erick Edgar Maldonado Bandala, Karina Cabrera Luna, J. I. Escalante García, Demetrio Nieves Mendoza
This research presents the results of concretes made with supersulfated cements (SSC) volcanic material bases. The concretes were cured under two regimes one for 24 h at 25 ° C and one for 22 h at 60 ° C and then at 25 ° C. The specimens were exposed to two conditions, dry under laboratory conditions and immersed in a solution with 3.5% CaSO 4 at 25 ° C for up to 180 days. After 180 days, the concrete with a 5% An-10% PC-10% CaO-75% PM cementant exposed to the CaSO4 solution achieved a compressive strength of 46 MPa and 44 MPa dry under conditions of laboratory. The microstructure was analyzed by scanning electron microscopy, energy dispersive spectroscopy and XRD, showing that the main hydration products are C-S-H and ettringite.
本文介绍了用过硫酸盐水泥(SSC)火山物质基制备混凝土的研究结果。混凝土在两种状态下进行养护，一种在25°C下养护24小时，一种在60°C下养护22小时，然后在25°C下养护。试件暴露在两种条件下，在实验室条件下干燥，并在含3.5% CaSO 4的25°C溶液中浸泡长达180天。掺入5% -10% PC-10% CaO-75% PM水泥的混凝土在CaSO4溶液中暴露180天后，抗压强度达到46 MPa，实验室干燥条件下抗压强度达到44 MPa。通过扫描电镜、能谱分析和XRD分析表明，水化产物主要为C-S-H和钙矾石。
{"title":"Resistance to compression and microstructure of concrete manufactured with supersulfated cements-based materials of volcanic origin exposed to a sulphate environment","authors":"Erick Edgar Maldonado Bandala, Karina Cabrera Luna, J. I. Escalante García, Demetrio Nieves Mendoza","doi":"10.21041/RA.V9I1.374","DOIUrl":"https://doi.org/10.21041/RA.V9I1.374","url":null,"abstract":"This research presents the results of concretes made with supersulfated cements (SSC) volcanic material bases. The concretes were cured under two regimes one for 24 h at 25 ° C and one for 22 h at 60 ° C and then at 25 ° C. The specimens were exposed to two conditions, dry under laboratory conditions and immersed in a solution with 3.5% CaSO 4 at 25 ° C for up to 180 days. After 180 days, the concrete with a 5% An-10% PC-10% CaO-75% PM cementant exposed to the CaSO4 solution achieved a compressive strength of 46 MPa and 44 MPa dry under conditions of laboratory. The microstructure was analyzed by scanning electron microscopy, energy dispersive spectroscopy and XRD, showing that the main hydration products are C-S-H and ettringite.","PeriodicalId":21260,"journal":{"name":"Revista ALCONPAT","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88755937","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}
Mauricio De Pina Ferreira, Marcos Honorato de Oliveira, A. F. Lima Neto, Luamim Sales Tapajós, Alex Nascimento, Marília Caires Freire
PBuscando avaliar a influência da ancoragem na resistência à flexão de vigas reforçadas com mantas de Polímero Reforçado com Fibra de Carbono (PRFC), foram analisados os resultados experimentais de 126 ensaios presentes na literatura e de uma série inédita, ensaiada pelos autores, com 4 vigas de concreto armado. São avaliados os parâmetros que afetam o desempenho e a resistência das vigas, e discutidos os critérios de dimensionamento do fib Bulletin 14 (2001) e ACI 440-2R (2008). Observou-se que, mesmo com dispositivos auxiliares na ancoragem do PRFC, falhas prematuras são possíveis, e também que ambas as recomendações teóricas conduzem a estimativas a favor da segurança, porém excessivamente conservadoras nos casos onde a ancoragem da manta de PRFC é feita adequadamente.
{"title":"Influência da ancoragem na resistência à flexão de vigas reforçadas com mantas de PRFC","authors":"Mauricio De Pina Ferreira, Marcos Honorato de Oliveira, A. F. Lima Neto, Luamim Sales Tapajós, Alex Nascimento, Marília Caires Freire","doi":"10.21041/RA.V9I1.269","DOIUrl":"https://doi.org/10.21041/RA.V9I1.269","url":null,"abstract":"PBuscando avaliar a influência da ancoragem na resistência à flexão de vigas reforçadas com mantas de Polímero Reforçado com Fibra de Carbono (PRFC), foram analisados os resultados experimentais de 126 ensaios presentes na literatura e de uma série inédita, ensaiada pelos autores, com 4 vigas de concreto armado. São avaliados os parâmetros que afetam o desempenho e a resistência das vigas, e discutidos os critérios de dimensionamento do fib Bulletin 14 (2001) e ACI 440-2R (2008). Observou-se que, mesmo com dispositivos auxiliares na ancoragem do PRFC, falhas prematuras são possíveis, e também que ambas as recomendações teóricas conduzem a estimativas a favor da segurança, porém excessivamente conservadoras nos casos onde a ancoragem da manta de PRFC é feita adequadamente.","PeriodicalId":21260,"journal":{"name":"Revista ALCONPAT","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89244237","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}
Journal of the Latin-American association of quality control, pathology and recovery of constructionhttp://www.revistaalconpat.orgWith great satisfaction, we present the first issue of the ninth year of the ALCONPAT journal.The aim of the journal is to publish case studies within the scope of the Association, namely quality control, pathology and recovery of constructions, including basic and applied research, reviews and documentary research.The V9 N1 issue begins with a work where Nicolle Christine Sotsek and colleagues provide, through a systematic review of the literature and focused on the quality control of buildings, a consistent database to present the most used criteria by the Building Performance Evaluation (BPE). It was possible to define 9 dimensions of analysis that are presented and discussed in this document.In the second work, Cristiano Corrêa et. al. present the computational simulation of a fire previously carried out as an experiment in a room that reproduced a single-family residence room, typically burnt down in the city of Recife (Pernambuco, Brazil). The objective of the article is to compare the results of the development of the temperatures of the gases obtained through computer simulation with the Fire Dynamics Simulator software (FDS) through the measurements obtained in the experiment. It was verified that the results obtained through the model developed in the FDS were coherent with those obtained experimentally.In the third article, Mauricio de Pina Ferreira et. al. evaluate the influence of anchoring on the flexural strength of beams reinforced with Carbon Fiber Reinforced Polymer (PRFC) blankets. The parameters affecting the performance and strength of the beams are evaluated, and the sizing criteria of FIB Bulletin 14 (2001) and ACI 440-2R (2008) are discussed. It was observed that, even with auxiliary devices in the anchoring of the PRFC, there is the possibility of premature failures, and that both recommendations lead to safe, but overly conservative estimates in cases where the anchoring of the PRFC blanket is carried out properly.In the fourth article, by Yagho de Souza Simões and Carol Ferreira Rezende Santos, we compare two techniques of structural reinforcement, carbon fiber and metal foil, used for the recovery of reinforced concrete structures degraded by fire. A deterioration of a beam in a fire situation is simulated from a thermal numerical modeling and, next, the reinforcements are calculated. It is concluded that carbon fiber has greater advantages regarding the reinforcement of beams.The fifth work in this issue is written by Ricardo José Carvalho Silva and colleagues, who analyze the efficiency of reinforcement in reinforced concrete beams by adding steel bars and epoxy adhesive. The tests showed that the clamps reduced the strength of the beams, compared to those that did not. The reinforced beams without clamps obtained better results, but the most important limiting factor was the adhesion betw
{"title":"RA V9 N1, Mensaje del Editor en Jefe (Enero - Abril 2019)","authors":"Pedro Castro Borges","doi":"10.21041/ra.v9i1.377","DOIUrl":"https://doi.org/10.21041/ra.v9i1.377","url":null,"abstract":"Journal of the Latin-American association of quality control, pathology and recovery of constructionhttp://www.revistaalconpat.orgWith great satisfaction, we present the first issue of the ninth year of the ALCONPAT journal.The aim of the journal is to publish case studies within the scope of the Association, namely quality control, pathology and recovery of constructions, including basic and applied research, reviews and documentary research.The V9 N1 issue begins with a work where Nicolle Christine Sotsek and colleagues provide, through a systematic review of the literature and focused on the quality control of buildings, a consistent database to present the most used criteria by the Building Performance Evaluation (BPE). It was possible to define 9 dimensions of analysis that are presented and discussed in this document.In the second work, Cristiano Corrêa et. al. present the computational simulation of a fire previously carried out as an experiment in a room that reproduced a single-family residence room, typically burnt down in the city of Recife (Pernambuco, Brazil). The objective of the article is to compare the results of the development of the temperatures of the gases obtained through computer simulation with the Fire Dynamics Simulator software (FDS) through the measurements obtained in the experiment. It was verified that the results obtained through the model developed in the FDS were coherent with those obtained experimentally.In the third article, Mauricio de Pina Ferreira et. al. evaluate the influence of anchoring on the flexural strength of beams reinforced with Carbon Fiber Reinforced Polymer (PRFC) blankets. The parameters affecting the performance and strength of the beams are evaluated, and the sizing criteria of FIB Bulletin 14 (2001) and ACI 440-2R (2008) are discussed. It was observed that, even with auxiliary devices in the anchoring of the PRFC, there is the possibility of premature failures, and that both recommendations lead to safe, but overly conservative estimates in cases where the anchoring of the PRFC blanket is carried out properly.In the fourth article, by Yagho de Souza Simões and Carol Ferreira Rezende Santos, we compare two techniques of structural reinforcement, carbon fiber and metal foil, used for the recovery of reinforced concrete structures degraded by fire. A deterioration of a beam in a fire situation is simulated from a thermal numerical modeling and, next, the reinforcements are calculated. It is concluded that carbon fiber has greater advantages regarding the reinforcement of beams.The fifth work in this issue is written by Ricardo José Carvalho Silva and colleagues, who analyze the efficiency of reinforcement in reinforced concrete beams by adding steel bars and epoxy adhesive. The tests showed that the clamps reduced the strength of the beams, compared to those that did not. The reinforced beams without clamps obtained better results, but the most important limiting factor was the adhesion betw","PeriodicalId":21260,"journal":{"name":"Revista ALCONPAT","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77354980","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}
Yagho de Souza Simões, Carol Ferreira Rezende Santos
Esse artigo tem como objetivo comparar duas técnicas de reforço estrutural, fibra de carbono e chapa metálica, utilizadas para recuperação de elementos de concreto armado degradados pela ação do fogo. Simula-se a deterioração de uma viga em situação de incêndio a partir de uma modelagem numérica térmica e, em seguida, são calculados os reforços mencionados. A fibra de carbono exigiu uma menor área em comparação àquela para chapa metálica, em função de sua elevada resistência mecânica. Como limitações, cita-se o fato de o estudo ser preliminar e envolver apenas uma análise térmica da viga, não sendo considerado o carregamento atuante e suas implicações. Conclui-se que a fibra de carbono apresenta maiores vantagens no que diz respeito ao reforço de vigas.
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