Although Glass Fiber Reinforced Polymer (GFRP) has many potential advantages as reinforcement in concrete structures, the loss in tensile strength of the GFRP reinforcing bar can be significant when exposed to the high alkali environments. Much effort was made to estimate the durability performance of GFRP in concrete; however, it is widely believed the data from accelerated aging tests is not appropriate to predict the longer-term performance of GFRP reinforcing bars. The lack of validated long-term data is the major obstacle for broad application of GFRP reinforcement in civil engineering practices. The main purpose of this study is to evaluate the longer-term deterioration rate of GFRP bars embedded in concrete, and to develop an accurate model that can provide better information to predict the longer-term performance of GFRP bars. In previous studies performed by Trejo, three GFRP bar types (V1, V2, and P type) with two different diameters (16 and 19 mm [0.625, and 0.7 in. referred as #5 and #6, respectively]) provided by different manufacturers were embedded in concrete beams. After pre-cracking by bending tests, specimens were stored outdoors at the Riverside Campus of Texas A&M University in College Station, Texas. After 7 years of outdoor exposure, the GFRP bars were extracted from the concrete beams and tension tests were performed to estimate the residual tensile strength. Several physical tests were also performed to assess the potential changes in the material. It was found that the tensile capacity of the GFRP bars embedded in concrete decreased; however, no significant changes in modulus of elasticity (MOE) were observed. Using this data and limited data from the literature, a probabilistic capacity model was developed using Bayesian updating. The developed probabilistic capacity model appropriately accounts for statistical uncertainties, considering the influence of the missing variables and remaining error due to the inexact model form. In this study, the reduction in tensile strength of GFRP reinforcement embedded in concrete is a function of the diffusion rate of the resin matrix, bar diameter, and time. The probabilistic model predicts that smaller GFRP bars exhibit faster degradation in the tensile capacity than the larger GFRP bars. For the GFRP bars, the model indicates that the probability that the environmental reduction factor required by The American Concrete Institute (ACI) and the American Association of State Highway Transportation Officials (AASHTO) for the design of concrete structures containing GFRP reinforcement is below the required value is 0.4, 0.25, and 0.2 after 100 years for #3, #5, and #6, respectively. The ACI 440 and AASHTO design strength for smaller bars is likely not safe.

The objective of this study is to process and characterize the compatibilized blends of acrylonitrile-butadiene-styrene (ABS) and polyamide-6 (PA6) using olefin based reactive copolymers and subsequently to utilize this blend as a matrix material in short glass fiber (SGF) reinforced composites and organoclay based nanocomposites by applying melt processing technique. In this context, commercially available epoxydized and maleated olefinic copolymers, ethylene-methyl acrylate-glycidyl methacrylate (EMA-GMA) and ethylene-n butyl acrylate-carbon monoxide-maleic anhydride (EnBACO-MAH) were used as compatibilizers at different ratios. Compatibilizing performance of these two olefinic polymers was investigated through blend morphologies, thermal and mechanical properties as a function of blend composition and compatibilizer loading level. Incorporation of compatibilizer resulted in a fine morphology with reduced dispersed particle size. At 5 % EnBACO-MAH, the toughness was observed to be the highest among the blends produced. SGF reinforced ABS and ABS/PA6 blends were prepared with twin screw extrusion. The effects of SGF concentration and extrusion process conditions on the fiber length distribution, mechanical properties and morphologies of the composites were examined. The most compatible organosilane type was designated from interfacial tension and short beam flexural tests, to promote adhesion of SGF to both ABS and PA6. Increasing amount of PA6 in the polymer matrix improved the strength, stiffness and also toughness of the composites. Effects of compatibilizer content and ABS/PA6 ratio on the morphology and mechanical properties of 30% SGF reinforced ABS/PA6 blends were investigated. The most striking result of the study was the improvement in the impact strength of the SGF/ABS/PA6 composite with the additions of compatibilizer. Melt intercalation method was applied to produce ABS/PA6 blends based organoclay nanocomposites. The effects of process conditions and material parameters on the morphology of blends, dispersibility of nanoparticles and mechanical properties were investigated. To improve mixing, the screws of the extruder were modified. Processing with co-rotation yielded finer blend morphology than processing with counter-rotation. Clays were selectively exfoliated in PA6 phase and agglomerated at the interface of ABS/PA6. High level of exfoliation was obtained with increasing PA6 content and with screw speed in co-rotation mode. Screw modification improved the dispersion of clay platelets in the matrix.

In this study, effect of injection molding process parameters on fiber length and on mechanical properties of Polyamide-6 / glass fiber composite were investigated to produce higher performance composites. Polyamide-6 was first compounded with an E-grade glass fiber in a co-rotating intermeshing twin screw extruder. Then, by using this composite, twenty-five types of experiments were performed by injection molding by changing the barrel temperature, injection pressure, hold pressure, mold temperature, cooling time and screw speed. Izod notched impact, tensile, viscosity, heat deflection temperature, differential scanning calorimetry tests were performed on injection molded samples. By performing these tests, the effects of process parameters on mechanical properties and on fiber length were observed. In order to understand the variation in mechanical properties, thermal tests were also conducted. Also, fiber length distributions of the samples were measured.Experimental data show that fiber breakage decreases with increasing screw speed, injection pressure, however, fiber length increases with increasing barrel temperature, mold temperature and cooling time. Fiber length is almost not affected with the hold pressure. It is assumed in this study that crystallinity is not affected with injection pressure, hold pressure and screw speed. As barrel temperature and cooling time increase, crystallinity increases, however, as mold temperature increases, crystallinity decreases. Impact strength, tensile modulus and tensile strength increase, whereas elongation at break decreases with the average fiber length. Crystallinity affects the tensile strength and modulus positively. The tensile strength and modulus increase with increasing crystallinity.

In the first part of this dissertation, glass fiber reinforced/unreinforced polyamide 6 (PA6) and polyamide 66 (PA66) were compounded with three different flame retardants, which were melamine cyanurate, red phosphorus and brominated epoxy with antimony trioxide, by using an industrial scale twin screw extruder. Then, to investigate flame retardancy of these specimens, UL-94, Limiting Oxygen Index (LOI) and Mass Loss Cone Calorimeter (MLC) tests were carried out. In addition to flammability tests, thermogravimetric analysis (TGA) and tensile testing were performed. Results of the tensile tests were evaluated by relating them with fiber length distributions and fracture surface morphologies under scanning electron microscope (SEM). Incorporation of melamine cyanurate (MCA) to PA6 led to some increase in LOI value and minor reductions in Peak Heat Release Rate (PHRR) value. However, it failed to improve UL-94 rating. Moreover, poor compatibility of MCA with PA6 matrix caused significant reductions in tensile strength. Brominated epoxy in combination with antimony trioxide (Br/Sb) was compounded with both glass fiber reinforced PA6 and PA66. Br/Sb synergism was found to impart excellent flammability reductions in LOI value and UL-94 as V-0 rating. Effectiveness of Br/Sb flame retardant was also proven by the MLC measurements, which showed excessive reductions in PHRR and Total Heat Evolved (THE) values. On the other hand, Br/Sb shifted the degradation temperature 100&deg / C lower and decreased the tensile strength value, due to poor fiber-matrix adhesion and decreased fiber lengths. Red phosphorus (RP), when introduced to glass fiber reinforced PA66 induced V-0 rating in UL-94 together with significant increase in LOI value, and major decrease in PHRR. Degradation temperature was 20&deg / C lower while mechanical properties were kept at acceptable values compared to neat glass fiber reinforced PA66. In the second part of this dissertation, to investigate synergistic flame retardancy of nanoclays / glass fiber reinforced PA6 was compounded by certain nanoclay and an organo-phosphorus flame retardant (OP), which contains aluminum phosphinate, melamine polyphosphate and zinc borate, in a laboratory scale twin screw extruder. Exfoliated clay structure of the nanocomposites was assessed by X-Ray Diffraction (XRD) and Transmission Electron Microscopy (TEM), while thermal stability and combustion behaviors were evaluated by TGA, LOI, UL-94 and MLC. Replacement of a certain fraction of the flame retardant with nanoclay was found to significantly reduce PHRR and THE values, and delay the ignition. Moreover, remarkable improvements were obtained in LOI values along with maintained UL-94 ratings. Residue characterization by ATR-FTIR and SEM ascribed the enhanced flame retardancy of nanocomposite specimens to the formation of a glassy boron-aluminum phosphate barrier reinforced by clay layers at the nanoscale.

Polymeric composites are any of the combinations or compositions that comprise two or more materials as separate phases, at least one of which is a polymer. By mixing a polymer with another material, such as glass, carbon, or another polymer, it is often possible to improve the desired properties of the polymer. In this study, ternary composites were prepared by using recycled poly(ethylene terephthalate), PET as the matrix material, short glass fiber (SGF) as the reinforcing filler and thermoplastic elastomer as the impact modifier. Bottle grade recycled PET was mixed in a twin screw extruder with a thermoplastic elastomer which is a terpolymer of ethylene/methyl acrylate/glycidyl methacrylate (E-MA-GMA), and E type short glass fiber is fed to the extruder from a side feeder. During this study, recycled PET was mixed with from 10 to 50 wt. % elastomer, and SGF was added to the system in the range from 10 to 40 % by weight. Processing parameters were kept constant during extrusion. The composites were then compression molded for characterization experiments. The produced composites were characterized in terms of their mechanical and thermal properties and morphologies. Melt behavior and fiber length distribution of the composites were also determined for selected composites. In ternary systems with 10 % elastomer, highest tensile strength values were observed. High tensile and flexural moduli values were obtained for the composites containing 20 % elastomer. Results of impact tests designated that impact strength increased significantly after 30 % elastomer content. Thermal analyses of the composites were done by using a DSC (Differential Scanning Calorimeter). Degree of crystallinity of ternary system decreased with increasing elastomer content, but melting points of the composites were not affected significantly. SEM micrographs showed that the adhesion between the matrix and fiber increased considerably with elastomer addition.

82f. / Submitted by Suelen Reis (suziy.ellen@gmail.com) on 2013-04-23T18:03:32Z No. of bitstreams: 1 Dissertacao Gustavo de Freitas.pdf: 4255443 bytes, checksum: e1c6da0abf59a84ad236924bb2db824b (MD5) / Approved for entry into archive by Rodrigo Meirelles(rodrigomei@ufba.br) on 2013-05-08T12:35:27Z (GMT) No. of bitstreams: 1 Dissertacao Gustavo de Freitas.pdf: 4255443 bytes, checksum: e1c6da0abf59a84ad236924bb2db824b (MD5) / Made available in DSpace on 2013-05-08T12:35:27Z (GMT). No. of bitstreams: 1 Dissertacao Gustavo de Freitas.pdf: 4255443 bytes, checksum: e1c6da0abf59a84ad236924bb2db824b (MD5) Previous issue date: 2007 / O objetivo deste trabalho foi avaliar a resistência de união entre um pino de fibra de vidro e um cimento resinoso. Trinta cilindros de resina composta foram confeccionados e pinos de fibra de vidro (ReforPost - Angellus) cimentados em seu interior com um cimento resinoso dual (RELY-X – 3M). A fotoativação do cimento foi feita variando-se as fontes de luz (Halógena e LED). Cada um dos 30 cilindros foi cortado em três partes (terço cervical, médio e apical), resultando 90 discos que foram divididos em 09 grupos (n=10): Grupo 1- Oc: Optlight Plus – GNATUS, terço cervical; Grupo 2-Om: Optlight Plus – GNATUS, médio; Grupo 3-Oa: Optlight Plus – GNATUS, apical; Grupo 4-RC: RADII – SDI, cervical; Grupo 5 Rm: RADII – SDI, médio; Grupo 6-RC: RADII – SDI, apical; Grupo 7- Ec: Elipar Freelight2 – 3M, cervical; Grupo 8-Em: Elipar Freelight2 – 3M, médio; Grupo 9- Ea: Elipar Freelight2 – 3M, apical. Todos os grupos foram submetidos ao ensaio de tração diametral (DTS) em uma máquina de ensaios (EMIC 2000) até a fratura. As médias dos grupos em Mpa foram: G1-Oc: 25,08 (4,20); G2-Om: 23,44 (4,64); G3-Oa: 20,88 (3,62) G4- Rc: 22,86 (5,93); G5-Rm: 22,12 (6,72); G6-Ra: 22,04 (5,61); G7-Ec: 26,01 (3,33); G8-Em: 19,81 (6,09); G9-Ea: 17,74 (4,14). A análise estatística dos dados permitiu concluir que, o grupo G 9–Ea apresentou a menor resistência à tração diametral demonstrando diferença estatisticamente significante quando comparado com os grupos G7-Ec e G1-Oc e não houve influência das diferentes fontes de luz. Com base nestes resultados também podemos afirmar que o aparelho LED (RADII – SDI) apresentou valores de DTS constantes em todos os terços analisados. / Salvador

Polipropileno (PP) é um termoplástico com ótimo balanço de propriedades, baixo custo e largo espectro de aplicações. Seu uso como material de engenharia é limitado pelos seus valores relativamente baixos de propriedades mecânicas. A adição de reforço ao PP melhora suas propriedades termomecânicas, tornando-o adequado para fabricação de peças de engenharia como composto termoplástico. Fibra de vidro (FV) é o reforço mais empregado em compostos de PP devido a maior resistência mecânica específica gerada no PP e por atuar como agente nucleante. Devido à diferença entre as naturezas das ligações secundárias, há pouca afinidade química entre PP-FV, sendo necessária a modificação interfacial através de agentes de acoplamento poliméricos (AA) para melhorar o desempenho termomecânico deste composto. Averiguou-se neste trabalho a influência de dois AA, um à base de PP e outro à base de EPDM, ambos graftizados com anidrido maleico (PAM e EAM, respectivamente), no comportamento térmico do composto PP∕FV. Os compostos PP30FV-AA foram preparados em extrusora dupla rosca ZSK 26, e posteriormente injetados em uma injetora Airburg para obtenção de corpos de prova utilizando teor fixo de 30% FV e teores de 0,5∕1,0∕2,0% AA. O PP e seus compostos foram caracterizados via microscopia óptica acoplada à placa Hot Stage, cristalização isotérmica e não isotérmica por calorimetria (DSC), resistência à deflexão térmica (HDT), morfologia da fratura (MEV) e comportamento viscoelástico (DMA) para analisar a influência do AA e da FV. Os resultados obtidos foram avaliados estatisticamente via metodologia ANOVA (Analysis of Variance). O efeito sinérgico FV-AA na cristalização isotérmica do PP foi dependente da combinação temperatura-natureza-teor de AA, sendo a temperatura o fator preponderante. A interação interfacial entre a matriz- reforço foi substancialmente favorecida pelo PAM. O uso de EAM retardou a cristalização do PP, enquanto que o PAM favoreceu este processo. Constatou-se que o AA teve pouca influência no tempo de meia-vida de cristalização nas menores isotermas e, para isotermas mais próximas à fusão do PP, o PAM apresentou menores valores deste parâmetro. Os valores de deflexão térmica foram semelhantes para todas as formulações contendo PAM, enquanto que a adição de EAM decresceu esta propriedade. Em temperaturas inferiores à transição vítrea (Tg) do PP, todos os compostos com AA apresentaram menor módulo elástico em relação ao composto puro; em temperaturas superiores à Tg, o PAM favoreceu aumentou esta propriedade na faixa de temperatura em que o composto usualmente é utilizado. / Polypropylene (PP) features by its properties balance, price and large array of applications. However, its use as engineering component is limited by relative low mechanical properties. PP reinforcement improves its thermomechanical properties, turning it into suitable to produce engineering components as a reinforced thermoplastic composite. Glass fiber (GF) is the most usual reinforce utilized in PP due to its great specific mechanical strength elastic modulus and nucleation capability. In reason of different secondary bonds between PP and GF, it is mandatory to modify the interface between these domains through polymeric coupling agents (CA) to improve thermomechanical performance. It was evaluated the influence of two CA based on PP and EPDM grafted with maleic anhydride (PAM and EAM) on thermal behavior of PP∕GF composite. PP30GF-CA composites were prepared in a twin screw extrusor ZSK 26 and injected in an injector Airburg with fixed GF content (30%) and different CA contents (0.5∕1.0∕2.0%). PP and PP composites were analyzed by optical microscopy with Hot Stage, isothermal and non-isothermal crystallization (DSC), as well as viscoelastic behavior. The results were statistically evaluated by ANOVA (Analysis of Variance) methodology. The synergic role between GF∕CA in PP crystallization was dependent on temperature-nature-CA content, mainly influenced by temperature. Interfacial adhesion was mainly favored by PAM. The results pointed a possible PP isotherm crystallization retardant by EAM, whereas PAM significantly favored this same process. CA presence in PP30GF composite did not influence crystallization half-life time values in lower isotherms, while in isotherms near PP melting temperature, PAM considerably decreased this parameter. Deflection thermal values were not affected by PAM, while EAM decreased this property in whole formulations. CA did not improved PP∕GF elastic modulus below PP glass transition (Tg), while in temperatures above Tg, PAM improved PP-GF this same parameter.

Polipropileno (PP) é um termoplástico com ótimo balanço de propriedades, baixo custo e largo espectro de aplicações. Seu uso como material de engenharia é limitado pelos seus valores relativamente baixos de propriedades mecânicas. A adição de reforço ao PP melhora suas propriedades termomecânicas, tornando-o adequado para fabricação de peças de engenharia como composto termoplástico. Fibra de vidro (FV) é o reforço mais empregado em compostos de PP devido a maior resistência mecânica específica gerada no PP e por atuar como agente nucleante. Devido à diferença entre as naturezas das ligações secundárias, há pouca afinidade química entre PP-FV, sendo necessária a modificação interfacial através de agentes de acoplamento poliméricos (AA) para melhorar o desempenho termomecânico deste composto. Averiguou-se neste trabalho a influência de dois AA, um à base de PP e outro à base de EPDM, ambos graftizados com anidrido maleico (PAM e EAM, respectivamente), no comportamento térmico do composto PP∕FV. Os compostos PP30FV-AA foram preparados em extrusora dupla rosca ZSK 26, e posteriormente injetados em uma injetora Airburg para obtenção de corpos de prova utilizando teor fixo de 30% FV e teores de 0,5∕1,0∕2,0% AA. O PP e seus compostos foram caracterizados via microscopia óptica acoplada à placa Hot Stage, cristalização isotérmica e não isotérmica por calorimetria (DSC), resistência à deflexão térmica (HDT), morfologia da fratura (MEV) e comportamento viscoelástico (DMA) para analisar a influência do AA e da FV. Os resultados obtidos foram avaliados estatisticamente via metodologia ANOVA (Analysis of Variance). O efeito sinérgico FV-AA na cristalização isotérmica do PP foi dependente da combinação temperatura-natureza-teor de AA, sendo a temperatura o fator preponderante. A interação interfacial entre a matriz- reforço foi substancialmente favorecida pelo PAM. O uso de EAM retardou a cristalização do PP, enquanto que o PAM favoreceu este processo. Constatou-se que o AA teve pouca influência no tempo de meia-vida de cristalização nas menores isotermas e, para isotermas mais próximas à fusão do PP, o PAM apresentou menores valores deste parâmetro. Os valores de deflexão térmica foram semelhantes para todas as formulações contendo PAM, enquanto que a adição de EAM decresceu esta propriedade. Em temperaturas inferiores à transição vítrea (Tg) do PP, todos os compostos com AA apresentaram menor módulo elástico em relação ao composto puro; em temperaturas superiores à Tg, o PAM favoreceu aumentou esta propriedade na faixa de temperatura em que o composto usualmente é utilizado. / Polypropylene (PP) features by its properties balance, price and large array of applications. However, its use as engineering component is limited by relative low mechanical properties. PP reinforcement improves its thermomechanical properties, turning it into suitable to produce engineering components as a reinforced thermoplastic composite. Glass fiber (GF) is the most usual reinforce utilized in PP due to its great specific mechanical strength elastic modulus and nucleation capability. In reason of different secondary bonds between PP and GF, it is mandatory to modify the interface between these domains through polymeric coupling agents (CA) to improve thermomechanical performance. It was evaluated the influence of two CA based on PP and EPDM grafted with maleic anhydride (PAM and EAM) on thermal behavior of PP∕GF composite. PP30GF-CA composites were prepared in a twin screw extrusor ZSK 26 and injected in an injector Airburg with fixed GF content (30%) and different CA contents (0.5∕1.0∕2.0%). PP and PP composites were analyzed by optical microscopy with Hot Stage, isothermal and non-isothermal crystallization (DSC), as well as viscoelastic behavior. The results were statistically evaluated by ANOVA (Analysis of Variance) methodology. The synergic role between GF∕CA in PP crystallization was dependent on temperature-nature-CA content, mainly influenced by temperature. Interfacial adhesion was mainly favored by PAM. The results pointed a possible PP isotherm crystallization retardant by EAM, whereas PAM significantly favored this same process. CA presence in PP30GF composite did not influence crystallization half-life time values in lower isotherms, while in isotherms near PP melting temperature, PAM considerably decreased this parameter. Deflection thermal values were not affected by PAM, while EAM decreased this property in whole formulations. CA did not improved PP∕GF elastic modulus below PP glass transition (Tg), while in temperatures above Tg, PAM improved PP-GF this same parameter.

Com o intuito de elevar os valores de resistência à fratura dos dentes que sofreram tratamento endodôntico, várias técnicas restauradoras têm sido desenvolvidas. Atualmente os sistemas de pinos de fibras de carbono e de vidro são os dispositivos mais utilizados, devido às suas vantagens de possuírem módulo de elasticidade próximo ao da dentina, o que causa menor estresse e conseqüentemente menor quantidade de fraturas radiculares, além de não necessitarem da fase laboratorial. A escolha do cimento utilizado para a cimentação desses pinos, tem grande importância e o advento dos cimentos resinosos e dos sistemas adesivos que com eles podem ser empregados, representam uma grande evolução em razão das possibilidades de se obter retenções micromecânicas no interior dos condutos. Assim, o objetivo deste estudo foi avaliar a resistência à extrusão de pinos de fibras de vidro cimentados com cimento resinoso Rely X ARC com a aplicação de três diferentes sistemas adesivos: Scotchbond, Single bond e Adper Prompt LPop. Após a cimentação os espécimes foram seccionados em duas regiões, apical e cervical, que constituía cada uma um corpo de prova. Para possibilitar a realização do teste de extrusão, utilizou-se um dispositivo de aço inoxidável que estabilizava o corpo de prova. Este dispositivo tinha um orifício central que permitia o deslocamento do pino ou do cimento, durante o teste de extrusão. Para o teste de extrusão o corpo de prova foi adaptado no dispositivo com a face cervical voltada para baixo e uma ponta ativa com extremidade plana (1mm de diâmetro) foi adaptada à máquina de ensaios universal que exercia uma força de extrusão o mais próximo possível do centro do pino. O teste foi realizado com um deslocamento de 0,5mm por minuto, onde a carga máxima de falha foi registrada em kgf. No que diz respeito ao cimento resinoso Rely X ARC, em combinação com os adesivos utilizados, os melhores resultados na região cervical da raiz foram obtidos com o cimento Rely X com o sistema adesivo Scotchbond, seguido pelos sistemas Adper Prompt e Single bond. Na região apical o Scotchbond foi melhor que o Adper Prompt e o Single bond, mas não houve diferença estatisticamente significante entre o Adper Prompt e Single bond. / In order to increase strength to fracture of endodontically treated teeth, a number of restorative techniques were developed. Nowadays, carbon and glass fiber post systems are the most used due to their advantages of modulus of lasticity similar to dentin, which lead to lower stress and consequently lower number of root fractures, besides no laboratorial work is needed. The choice of the best cement for luting these posts is an important step and the development of resin cements and adhesive systems that can be use with posts are a great evolution due to the possibility of micromechanical retention in roots. Therefore, the aim of this study was to evaluate extrusion strength of glass fiber posts cemented with resin luting cement Rely X ARC using three different adhesive systems: Scothbond, Single bond and Adper Prompt L Pop. After luting, samples were seccionated in two regions, apical and cervical, each one representing one sample. A stainless steel device was used to perform extrusion test, stabilizing samples. This device had a central orifice that allowed movement of post or cement, during extrusion test. For extrusion test, sample was adapted in the device with cervical face directed to down and a plane surface active point (1 mm diameter) was adapted to the universal test machine which exerted an extrusion force in the center of post. Test was performed with 0.05 mm per minute and the maximum load at failure was registered in kgf. Regarding resin luting cement Rely X ARC combining with adhesive systems, the best results at cervical were obtained with Rely X and Scotchbond adhesive, followed by Adper Prompt and Single bond systems. At apical region Scotchbond was better than Adper Prompt and Single bond, but there was no statistically significant difference between Adper Prompt and Single bond.

A necessidade de recuperação e reforço em estruturas de madeira, concreto e aço exigiu da construção civil uma procura por métodos mais eficientes que pudessem cumprir esse papel. Com este objetivo vários estudos estão sendo realizados utilizando fibras reforçadas com polímeros (FRP). Dentre estas fibras, as que vêm apresentando melhores resultados como reforço para peças estruturais de madeiras são as fibras de carbono e as fibras de vidro. Dentro deste escopo, este trabalho tem como objetivo estudar o comportamento estrutural de vigas de madeira de espécies nacionais reforçadas com fibras de carbono e com fibras de vidro, verificando a eficiência deste reforço e adequando modelos de cálculo para avaliação da resistência e da rigidez das vigas reforçadas, e também verificar a eficiência de uma formulação de adesivos à base de mamona e do adesivo Cascophen, para fixação das respectivas fibras na madeira, em substituição ao adesivo epóxi, normalmente utilizado. Foram efetuados ensaios de vigas de madeira reforçadas com polímeros, em modelo reduzido, e em protótipos, para diversas configurações de geometria e quantidade de fibras utilizadas. Os resultados obtidos indicam uma boa concordância entre os modelos teóricos para avaliar a resistência e a rigidez das vigas reforçadas, e os resultados experimentais, e a eficiência do reforço. Também foram conduzidos ensaios de tração em corpos-de-prova de fibras laminado com os adesivos, caracterizando a sua resistência e elasticidade e comparando o comportamento dos adesivos estudados. Os resultados indicaram o melhor comportamento do adesivo epóxi. / The necessity of rehabilitation and reinforcement in wood structures, concrete and steel demanded a search for more efficient methods that could to carry this paper. With this objectives several studies are using fibers reinforced polymers (FRP). These fibers which presenting better results in structural reinforcement for structural pieces of wood are the fibers of carbon and the glass fibers. This work has as objective studies the structural behavior of wood beams of national species reinforced with carbon fibers and with glass fibers, verifying the efficiency of this reinforcement and adapting calculation models for evaluation of the strength and stiffness of the reinforced beams, and also to verify the efficiency of a formulation of adhesives to the castor oil and of the adhesive Cascophen, for fixation of the respective fibers in the wood, in substitution the adhesive epoxy, usually used. Experimental work was made with wood beams reinforced with polymeric, in reduced model, and in prototypes, for several geometry configurations and amount of used fibers. The obtained results indicate a good agreement among the theoretical models to evaluate the strength and stiffness of the reinforced beams, and the experimental results, and the efficiency of the reinforcement. Traction rehearsals were also led in body-of-proof of fibers laminated with the adhesives, characterizing your strength and elasticity and comparing the behavior of the studied adhesives. The results indicated the best behavior of the adhesive epoxy.