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102
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Introduction
Additional affiliations
August 1996 - present
Education
March 1999 - January 2004
March 1994 - April 1996
Field of study
- Master of Science in Civil Engineering (Structural Concrete)
March 1989 - December 1993
Publications
Publications (102)
Resumo O uso de painéis sanduíche na construção civil é uma alternativa viável na busca por materiais com baixo peso próprio, menor condutividade térmica e resistentes à compressão. Para aumentar a sustentabilidade dessa solução, é preciso substituir o reforço de aço das faces e o núcleo em EPS por materiais que apresentem menor custo energético e...
The industrial revolution altered the way resources are consumed, primarily increasing the intensity of extraction with a tendency to exhaust natural reserves. It is necessary to replace artificial materials and those derived from non-renewable sources with biomaterials, particularly those characterized as waste from productive activities. In this...
The use of cementitious composites reinforced with plant fibers in construction elements has emerged as a promising alternative to mitigate the environmental impact of the construction industry. The challenge of chemical incompatibility between plant fibers and the matrix has been addressed through the incorporation of mineral additives, with metak...
O grande crescimento da demanda por energia renovável nos últimos anos tem representado um desafio à engenharia estrutural pela necessidade de estruturas maiores e mais esbeltas para aumento da capacidade de geração. Demandas de mercado tem resultado na substituição de torres e plataformas em aço por estruturas de concreto armado, que podem incorpo...
The retrofitting process contributes to the sustainability of the construction sector, since adopting measures to increase the lifespan of buildings reduces the need for new constructions. However, many of the materials used in this process come from nonrenewable sources and require significant water and energy consumption for production. The aim o...
The objective of this study is to present a new method of reinforcing masonry using layers of mortar reinforced with short jute fibers. Mortars were produced with 0%, 2% and 3% jute fibers with cementitious matrices free of calcium hydroxide. The effectiveness of the reinforced mortar was evaluated through diagonal compression tests of hollow ceram...
The use of fabric in reinforcing cement-based materials expands their applications for various types of construction elements. Additionally, employing renewable sources of plant-based fabrics contributes to reducing the environmental impact of the construction industry. However, the variability in the properties of plant fibers and fabrics necessit...
A utilização de agregados reciclados oriundos do beneficiamento de resíduos de demolição de estruturas de concreto é uma das principais formas de reduzir o impacto ambiental resultante da extração de agregados minerais para serem utilizados na construção civil. No entanto, esses agregados reciclados são compostos de rocha natural e uma camada super...
A deflexão excessiva de elementos fletidos é uma das principais patologias que atingem as estruturas de concreto armado, causando fissuração de elementos estruturais, em elementos não-estruturais, e mesmo sensação de desconforto ao usuário. Para evitar esse tipo de problema, é preciso a adoção de métodos de cálculo de deflexões que incorporem as pr...
O objetivo deste estudo foi analisar o comportamento da resistividade elétrica em compósitos cimentícios reforçados com fibras curtas de sisal. Para este fim, foram produzidos compósitos com 4% de fibra de sisal, em massa de aglomerante, para relações água/cimento de 0,35 e 0,40. E compósitos com 6% de fibra de sisal para relação água/cimento de 0,...
A construção civil apresenta desafios para poder desempenhar melhorias para o conforto da sociedade, em contrapartida é responsável por grande parte dos resíduos.
A construção civil é responsável por provocar grande impacto ambiental devido a emissão de gases poluentes, geração de resíduos e degradação de recursos. Devido ao potencial que essa indústria tem de absorver parte dos resíduos sólidos, diversos estudos têm sido desenvolvidos utilizando os resíduos como matéria prima de outros processos produtivos...
![Figure 2. Experimental setup [15] : a) four-point bending test; b)...](publication/364836222/figure/fig1/AS:11431281094034418@1667343187700/Experimental-setup-15-a-four-point-bending-test-b-under-reinforced-beam-c_Q320.jpg)
The prediction of the behavior of reinforced concrete beams under bending is essential for the perfect design of these elements. Usually, the classical models do not incorporate the physical nonlinear behavior of concrete under tension and compression, which can underestimate the deformations in the structural element under short and long-term load...
Glass fiber reinforced polymer (GFRP) bars have been increasingly used as reinforcement in concrete structures. However, when the bars are exposed to high temperatures, there is a change in the internal structure of the polymer which affects the tensile strength of the matrix and its adhesion with the fibers, reducing the mechanical strength of the...
Natural fibers as reinforcement of cementitious matrices have become a material with greater toughness, strength, and sustainability for the construction industry. However, their use can generate some inconveniences due to the high-water absorption of the natural fiber, which affects the production and durability of composites. In this work, the au...
Esta pesquisa teve como objetivo analisar o efeito da variação do número de camadas de reforço no comportamento a flexão de painéis sanduiches com faces em compósitos cimentícios reforçados com tecido de juta e núcleo de poliestireno extrudado (XPS). A preferência da utilização de fibras naturais e não as sintéticas deve-se ao fato do custo e produ...
Abstract This study investigates the effect of hydrothermal aging on the properties of glass fiber reinforced polymer (GFRP) rebars manufactured with isophthalic polyester or vinylester resin and glass fiber type E. The GFRP rebars were immersed in an alkaline solution (pH 12.6) for 1000 h at different temperatures (23 and 60 ºC), and their deterio...
Neste trabalho foram realizados ensaios experimentais em ligações compostas por duas chapas metálicas de espessura de 1,270 mm, 1,984 mm e 3,175 mm, conectadas por dois parafusos autoperfurantes de 6,35 mm de diâmetro, dispostos longitudinalmente. Foram testadas nove conexões diferentes, em que se variou a espessura da chapa em contato com a cabeça...
A medida da resistividade elétrica do concreto torna-se uma grande aliada na prevenção de processos de deterioração do concreto armado e pode, inclusive, contribuir para ampliar a vida útil de projeto da estrutura de concreto armado. A resistividade elétrica (iônica) do concreto, assim como seu inverso, que é a condutividade iônica (elétrica) são p...
Resumo
A previsão correta do comportamento mecânico de vigas de concreto armado é fundamental para garantir o dimensionamento de elementos mais otimizados e seguros. Neste trabalho foi investigada a utilização do modelo de plasticidade na análise numérica, via método dos elementos finitos, de vigas de concreto armado com diferentes taxas de armadu...
Resumo
A previsão correta do comportamento mecânico de vigas de concreto armado é fundamental para garantir o dimensionamento de elementos mais otimizados e seguros. Neste trabalho foi investigada a utilização do modelo de plasticidade na análise numérica, via método dos elementos finitos, de vigas de concreto armado com diferentes taxas de armadu...
The operation of reinforced concrete structures is directly associated with the adhesion between the steel bar and the concrete, which allows the internal forces to be transferred to the reinforcement during the process of loading the structural elements. The modification of the concrete composition, with the introduction of recycled aggregate from...
O escopo do livro Princípios da Ciência dos Materiais Cimentícios: produção, reações, aplicações e avanços tecnológicos é muito mais amplo que o dos livros existentes, que tendem a se concentrar em cimento e concreto, e permite observar a versatilidade da equipe de autores. Felizmente, inclui tópicos que, de forma usual, são solenemente ignorados p...
The production of concrete using recycled aggregates, obtained from the processing of construction and demolition waste, is extensively practiced worldwide. However, the effect of simultaneous adding fine recycled aggregate and the recycled coarse aggregate on the mechanical properties of concrete is still unfamiliar. This work aims to evaluate the...
O presente estudo teve como objetivo avaliar a resistividade elétrica
de concretos com diferentes teores de agregado graúdo (em 40%,
43% e 46%), utilizando o método direto prescrito pela norma espanhola UNE 83988-1 e com o auxílio de um aparato desenvolvido
em laboratório. Além da variação da composição do concreto, dois
parâmetros associados ao en...
A resistividade elétrica pode ser vista como um parâmetro de verificação da corrosão em estruturas, pois indica a resistência do concreto quanto à penetração de agentes deteriorantes, no entanto, pode ser influenciada por diversos fatores, que estão associados à composição do material e devido aos próprios parâmetros de ensaio. O objetivo deste art...
O uso de concreto reciclado em lajes pré-moldadas poderia reduzir bastante o consumo de agregado natural e minimizar o impacto ambiental do setor da construção civil. No entanto, devido ao menor módulo de elasticidade do concreto reciclado é necessário avaliar o impacto da substituição do agregado reciclado quanto aos estados limites de deformação...
Concrete with recycled aggregate is a fragile material under tensile stresses. However, like conventional concrete, it is possible that its contribution is relevant in the design of reinforced concrete elements under tension or bending, even after cracking. The objective of this work is to evaluate the application of the analytical models used to p...
O presente estudo teve como objetivo avaliar a resistividade elétrica volumétrica dos concretos com base em dois procedimentos de ensaio: influência do teor de umidade e níveis de fissuração. Foram produzidos concretos com alterações no tipo de cimento utilizado, relação água/cimento e teor de agregado graúdo. Para análise da umidade dos concretos,...
Due to the increasing search for renewable resources, plant fibers have become an alternative when creating new products. Studies demonstrate the potential use of pineapple fibers in composites. The objective of this work was to evaluate the genetic diversity and verify any association between ISSR (Inter Simple Sequence Repeats) bands and quality...
Resumo Neste trabalho dois microconcretos, com e sem metacaulinita, foram dosados para produção de compósitos laminados reforçados com fibras longas de sisal. Para garantir uma matriz livre de hidróxido de cálcio foi determinado o teor ideal de metacaolinita por análise termogravimétrica de pastas com teores de substituição de 20%, 30% e 40 nas ida...
Biomass ash has been produced worldwide in large quantities and has often generated high storage costs or environmental problems. A valorisation alternative, regarding this waste, has been its use in mortar or concrete; however, as biomass ashes exhibit larger variations in physico-chemical characteristics, which depend on the type of biomass fired...
Reinforced concrete is the main structural material used in the world in the construction of bridges, roads and commercial and residential buildings. One effective method for preventing corrosion of steel reinforcement is the application of galvanic coatings to the reinforcement itself. The present study evaluated the performance of three groups of...
![FIGURE 1. Structural formulas of starch and cellulose [36].](publication/317313285/figure/fig1/AS:500828876308480@1496418317830/Structural-formulas-of-starch-and-cellulose-36_Q320.jpg)
Sisal fiber, available in various semi-arid regions around the world, is the most studied natural fiber for the reinforcement of polymeric and cement-based composites. However, to improve the fiber–matrix interaction and to reduce the hydrophilicity of the fiber, it is necessary to establish surface treatments that employ sustainable materials, unl...
This work is dedicated to the assessment of the structural performance of a new lightweight block for one-way precast concrete slabs made of short sisal fiber reinforced concrete (SSFRC) containing natural and recycled aggregate. The influence of the sisal fibers and recycled aggregate on the physical and mechanical properties was assessed experime...
The proper use of vegetable fibers and recycled aggregates in prefabricated structural elements could permit the development of sustainable and cost competitive housing (efficient and durable) that can be constructed in a fast way without the necessity of heavy machinery. In this work, a new type of block made by cementitious composites reinforced...
Natural fibres as dispersed reinforcement in cement-based materials may
represent an interesting alternative to industrial fibres, because of their good
mechanical properties and inborn sustainability signature. In this section the
mechanical properties of Natural Fibre Reinforced Cementitious Composites
(NFRCCs) will be reviewed. Cutting-edge topi...
This section presents some construction applications where sustainable
fibres (both natural and from tire recycling industry) are used as fundamental or
complementary reinforcement of cement based materials. Recent significant
advances have been achieved on the enhancement of durability performance of
natural (also currently designated by vegetable...
Natural fibres as dispersed reinforcement in cement-based materials may represent an interesting alternative to industrial fibres, because of their good mechanical properties and inborn sustainability signature. In this section the mechanical properties of Natural Fibre Reinforced Cementitious Composites (NFRCCs) will be reviewed. Cutting-edge topi...
The residue of Ethylene-Vinyl Acetate (EVA) generated in the footwear industry is an
economic and environmental problem as it requires large area for storage in landfills and is not
biodegradable or capable of transformation into other polymers. Its use as a lightweight aggregate in
mortar and concrete results in a material with lower density but w...
Several fiber treatments are used to mitigate the high water absorption of vegetable fibers. Wetting and drying cycles are usually performed in the industry of paper and cellulose to reduce the volume variation of these fibers. This procedure stiffens the polymeric structure of the fiber-cells (this process is known as hornification) resulting in a...
The proper use of renewable or recycled source materials can contribute significantly to reducing the environmental impact of construction industry. In this work, cement-based composites reinforced with natural fibres were developed and their mechanical behaviour was characterised. To ensure the composite sustainability and durability, the ordinary...
RESUMO O elevado consumo de recursos não renováveis associado à geração de resíduos sólidos e gasto energético vem incentivando a busca por materiais sustentáveis que possam ser utilizados na construção civil. Os materiais compósitos com fibras vegetais, renováveis e biodegradáveis, surgem como uma alternativa para minimizar o impacto ambiental e t...
Sisal fiber-cement composites reinforced with 4% and 6% of short fibers were
developed and their physical-mechanical behavior was characterized in the present
study. To ensure the composite sustainability and durability, the ordinary Portland
cement matrix was modified by adding metakaolin, and the natural aggregate was
substituted by 10% and 20% o...
Several fiber treatments can be applied to mitigate the high water absorption of vegetal fibers. Wetting and drying cycles are usually performed in the industry of paper and cellulose to reduce the volume variation of the natural fibers. This procedure stiffens the polymeric structure of the fiber-cells (process known as hornification) resulting in...
The use of natural fibers to reinforce of cementitious matrices permits the development of sustainable materials with many potential applications. However, the improvement of such materials strongly depends on experimental studies, making the process slow and expensive. The numerical methods currently available for modeling composites can adequatel...
Biomass ash is a solid waste generated in large quantities in stand-alone boilers for the generation of power and heat. The cocoa industry, which uses cocoa almond bark (20%) and eucalyptus wood (80%) as fuel, generates fly and bottom ash. The fact that the properties of the ash are little known limits its correct provision and application. In this...
Tanks for storage of rain water has been a major social technologies used in the
semiarid maintenance man in the field. In periods without rain it is the only source of
drinking water supply in many regions. The cistern provides water for food production and
animal husbandry allowing survival in semiarid. However, many floors used for collecting
ra...
A busca por soluções sustentáveis é um desafio para a Indústria da Construção Civil que é caracterizada por um alto consumo de energia e recursos naturais e grande geração de resíduos. Considerando ainda a saúde e o conforto humano como indicadores importantes de sustentabilidade, verifica-se a necessidade premente de inovações para elementos de co...
The dimensional instability of vegetable fibers due to hygroscopicity results in a gradual loss of adherence in cement based composites which, when in service, are submitted to a natural variation of humidity. Such an effect reduces the contribution of the fiber as a reinforcement and can cause the early rupture of the material. In this work, a tre...
This work presents a model to predict the flexural behavior of reinforced concrete slabs, combining the Mazars damage model for simulation of the loss of stiffness of the concrete during the cracking process and the Classical Theory of Laminates, to govern the bending of the structural element. A variational formulation based on the principle of vi...
Sisal fiber is an important agricultural product used in the manufacture of ropes, rugs and also as a reinforcement of polymeric or cement-based composites. However, during the fiber production process a large amount of residues is generated which currently have a low potential for commercial use. The aim of this study is to characterize the agricu...
Cycles of wetting and drying can change the microstructure of vegetable fibers through a mechanism known as hornification, which modifies the polymeric structure of the fiber-cells resulting in a higher dimensional stability. In the present work the influence of hornification on the sisal fiber-matrix bond adhesion as well as in the sisal fiber dim...
In this work it was studied the influence of recycled fine aggregate obtained from construction and demolition waste (CDW) on the rheological properties of Portland cement mortars. The CDW was initially separate in their main constituents (mortar, ceramic and concrete debris) at the laboratory and then grinded separately to the sand size in order t...
O aproveitamento de água da chuva é uma técnica antiga; seu armazenamento constitui, muitas vezes,
a única fonte de suprimento de água para consumo humano e uso doméstico em muitas regiões rurais sem
acesso à rede pública de fornecimento de água potável. Nas últimas décadas vários sistemas de captação e armazenamento de água da chuva têm sido imple...
Apesar do uso cada vez mais frequente de fibras de aco em elementos estruturais de concreto armado, ainda e incipiente o desenvolvimento de modelos teoricos ou computacionais que possam ser utilizados para o dimensionamento e analise desses elementos. A adicao de fibras de aco altera o comportamento tensao-deformacao do concreto, tanto na compressa...
The concrete is an outstanding material with vast utilization in the civil construction area. The determination of nonlinear behavior of concrete is still a major challenge in structural engineering. In this study there were investigated three smeared cracking models used for numerical modeling of reinforced concrete beam: fixed, rotational and mul...
The use of recycled aggregates (RA) for concrete production usually involves a reduction of the workability as measured by slump. This reduction is mainly due to higher absorption rates, rough-textured surfaces and particles with quite irregular shape from RA. Besides that, the slump test is a static test, whose result is influenced by its own weig...
The use of recycled aggregate from construction and demolition waste (CDW) as replacement of fine and coarse natural aggregate has increased in recent years in order to reduce the high consumption of natural resources by the civil construction sector. In this work, an experimental investigation was carried out to investigate the influence of steel...
The concrete is an outstanding material with vast utilization in the civil construction area. The determination of nonlinear behavior of concrete is still a major challenge in structural engineering. In this study there were investigated three smeared cracking models used for numerical modeling of reinforced concrete beam: fixed, rotational and mul...
To design building elements using sisal fibre reinforced mortar composites, the stress-strain curves of the composites both under tensile and compression load is needed. In this study short sisal fibre-cement based composites were developed and their stress-strain behaviour under compression characterized experimentally. The composites consisted of...
Resumo: Embora a utilização de fibras vegetais como reforço de matrizes a base de cimento remonte à década de 70, poucos estudos têm sido realizados para investigação experimental e analítica desses compósitos sob tração direta. Nesse trabalho, foi avaliado o comportamento de argamassas reforçadas com fibras curtas de sisal sob ensaio de tração. O...
The use of fine recycled aggregates as raw material in the production of mortars appears as a good alternative to mini-mize waste disposal, so as to reduce natural resources consumption and to find and supply suitable substitutes for natu-ral aggregates. However, the use of this alternative material in a safe way must be carried out by a wide inves...
This article proposes a simple methodology for the morphological characterization of sand particles through scanning electron microscopy (SEM) and image analysis. It was tested on comparison of natural sands, and artificial sands composed by construction and demolition waste (CDW) from mortar, ceramic, and concrete.The samples were segregated by a...
