Bernardo Fonseca Tutikian

Universidade do Vale do Rio dos Sinos | UNISINOS

Resumo Diversas características influenciam a resistência ao fogo de sistema de parede em alvenaria estrutural, dentre as quais pode se incluir sua resistência à compressão. O comportamento desse sistema é validado experimentalmente conforme a norma NBR 5628. Esse estudo tem como objetivo analisar comparativamente a resistência ao fogo obtida atrav...

A garantia do conforto e privacidade acústica para os usuários das edificações é função da capacidade de isolamento sonoro dos sistemas construtivos, sendo regulamentado por descritores e intervalos de isolamento acústico definidos pelas normas e legislação, tanto no Brasil como na Espanha e em Portugal. No âmbito das edificações, o ruído de vizinh...

In rooms with unsatisfactoryauditory comfort, materials can be added to reduce the reflection of sound energy. These materials can be wools shaped in the form of panels, baffles or clouds, and the type of mounting in relation to the reflective surface greatly impacts their sound absorption performance. Therefore, the objective of this study is to v...

Ultra-high-performance concrete (UHPC) is a material that has high compactness, low porosity, and high mechanical strength, with especially high tensile strength. Due to these characteristics, the behavior of the material when exposed to high temperatures is debatable. The high amount of fibers in the mixture, which makes UHPC present a high tensil...

Para um melhor desempenho, na resistência aderência em argamassas, ocorre a inserção de aditivos que auxiliem na durabilidade da estrutura, sem prejudicar a aderência, mitigando danos patológicos. O objetivo desse estudo, é comparar o impacto da inserção de aditivos cristalizantes e impermeabilizantes na resistência de aderência à tração de argamas...

Clay brick masonry is a construction system used worldwide due to its economy and technical viability. While its behavior when subjected to high temperatures is relatively well known, civilian construction has evolved and introduced lighter and more slender elements with no assessment of the potential decrease in performance. This study sought to d...

The use of polymeric compounds is limited to sealing masonry in Brazil, due to the criteria of the NBR 16590 [¹1ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 16590-1:2017 Composto polimérico para assentamento de alvenaria de vedação. Parte 1: Requisitos. Rio de Janeiro, 2017.]. However, one must evaluate how much this material can contribute when...

This paper verified the structural behavior of three configurations of composite beams of wood and steel profiles, analytically by the mixed section homogenization method (MHSM), by experimental tests and simulated by the finite element method (FEM). Unreinforced wooden beam (V-SR), with bent steel sheet profiles fixed with stud (V-PRI) and self-ta...

Ultrahigh‐performance concrete (UHPC) is becoming increasingly frequent in several civil construction projects such as industries, buildings, and even infrastructure. The rheological and mechanical behaviors, coupled with durability, are the driving motives for this increase in use over the last few decades. However, the type of mixer used in UHPC...

Investigating the behavior of self-healing cementitious composites is necessary to know alternatives that can be applied in structures increasing their life service. Therefore, this study evaluated concrete self-he aling from the use of expanded perlite (EP) and expanded clay (EC) capsules impregnated with a sodium metasilicate solution. These mate...

The main system of a construction is the structure. Its replacement is most of the times unfeasible and its repair or demolition generates waste that is often difficult to recycle, reuse or dispose of. In this way, structures with longer design service life (DSL) will generate lower environmental impacts, in addition to being financially more inter...

Sandwich panels are systems with structural functions that are used in the field of civil construction, currently, they are used in the construction of buildings and also as cladding for walls, ceilings, among others. This article shows the results of an experimental comparative analysis of the behavior of fire resistance in two sandwich panels wit...

The composite precast slabs are composite systems, in which they are constituted by concrete joists (reinforced or prestressed), filling components and a solidarization layer in reinforced concrete. It is a construction system widely used in the world, mainly in Ibero-American countries, such as Brazil and Spain, for example. However, there is stil...

The incorporation of reinforcements is a necessity to compensate for the deficiency that concrete presents with its fragile behavior and low deformation capacity. One of the solutions to improve tensile performance is the addition of fiber in random distributions throughout the volume. However, this strategy can compromise the compressive strength...

This study evaluated Engineered Cementitious Composites (ECC) with polyvinyl alcohol (PVA), polypropylene (PP) or recycled polyester (POL) fibers inserted in a matrix with elevated silica fume content. Several PP (2.2–2.6%) and POL (2.3–2.7%) contents were tested and compared to a compound containing 2.0% PVA. Flexural bending strength tests, the b...

The materials used in civil construction are undergoing significant advances to achieve reduced maintenance and increased durability. This study analyzed the self-cleaning potential of Glass fiber Reinforced Concrete (GRC) with the addition of titanium dioxide (TiO2) in contents of 3, 5, and 7% with respect to the mass of cement. We evaluated the s...

Os estudos envolvendo o Engineered Cementitious Composites (ECC) foram iniciados há mais de 30 anos, e ainda se encontram em constante desenvolvimento. Estes apresentam propriedades mecânicas superiores quando comparados aos concretos convencionais, principalmente, as características relacionadas ao comportamento à tração. Para tanto, a adição de f...

Livro que trata sobre fundamentos, propriedades do UHPC e apresenta o método de dosagem de UHPC criado por mim na minha tese de doutorado.

During a fire, the masonry can degrade due to the action of high temperatures. Mortar coating, being the last component of masonry, can suffer a considerable reduction in its mechanical properties. The study of macro-structural changes, such as the tensile bond strength in coating mortars when masonry is exposed to high temperatures is important to...

The building industry has a large environmental impact. The replacement of natural aggregates by residues in cement composites it is an alternative. By another side, acoustic performance is very important to provide comfort to the users, and it is still more important in Covid-19’ outbreak, because people stay much more time at home. There are some...

Bacterial solutions have been studied to promote self-healing of cementitious matrices, however, the concentration of this solutions varied between studies. Consequently, the objective of this study was to evaluate the self-healing potential of different concentrations of Bacillus subtilis AP91 encapsulated in expanded perlite (EP). Visual examinat...

Este estudo analisou o potencial de cicatrização do concreto quando do uso de soluções bacterianas e soluções químicas, avaliando diferentes materiais que podem ser empregados para seu encapsulamento. Para encapsular os agentes, foram empregadas argila expandida e perlita expandida. Para analisar a eficácia da cicatrização, realizaram-se as técnica...

This study assesses the ballistic impact strength of thin plates made of ultra-high-performance concrete (UHPC) with low cement content (250 kg/m3) and volumes of 80% steel and 20% polypropylene (PP) hybrid fibers. The plates were prepared with thicknesses of 30, 50, and 70 mm and fiber volume ratios of 1.5% and 3.0%. Compressive strength, flexural...

The possibility of incorporating scrap tire residue into concrete has already been consolidated in previous studies, but there is a knowledge gap about how the concrete made with recycled tire materials behaves when exposed to high temperatures. This study aims to investigate the performance of precast concrete panels made with scrap tire residues...

Ahead of the incorporation of residues in concrete composition, there is a decline in the environmental impact of buildings. One of the goals of today’s development is the employment of low-impact energy sources, such as thermoelectric. Thermoelectric industries display a high rate of residues, among which is pointed out coal bottom ash (CBA) (15%...

Resumo Considerando o uso expressivo no cenário nacional de lajes pré-fabricadas de concreto com elementos inertes de preenchimento do tipo cerâmico, este trabalho contém a avaliação do comportamento do sistema frente a ruídos aéreos e de impacto, em diferentes composições. Foram realizados ensaios em câmara reverberante vertical, conforme a ISO 10...

Composite steel decking concrete slabs are an important structural member in building construction. Nevertheless , the behavior of these slabs in case of fire are not yet well characterized and the corresponding fire design methods need improvements. Several parameters that affect the behavior of these slabs in case of fire and that are not taken i...

It is necessary to study fire safety in buildings because the lack of knowledge in the behavior of materials has taken too many lives. However, this field has designed innovating construction systems and materials such as structural insulated panels (SIP), this is a much more practical alternative for fastest constructions, reducing the amount of m...

The materials that compose a construction system influence directly the acoustic performance of buildings. In masonry systems, through experiments, the geometry of the blocks and the types of coating were perceived as fundamental factors on the acoustic performance of walls. Therefore, this study intends to enrich the database and promote analysis...

It is necessary to study fire safety in buildings because the lack of knowledge in the behavior of materials has taken too many lives. However, this field has designed innovating construction systems and materials such as structural insulated panels (SIP), this is a much more practical alternative for fastest constructions, reducing the amount of m...

The thermal behavior of composite steel-concrete slabs in fire is more or less known, however there are still a lot of different aspects in the fire design methods that need clarification. A comparison of the temperature distribution in the cross-section of steel decking concrete slabs subjected to fire is made through three different procedures: (...

This paper aimed to develop a method to analyze and rank self‐consolidating concrete (SCC) according to its robustness, considering isolated and simultaneous variations in its main components, like water (±6%) and cement content (ΔC±), in three matrices with binder to aggregate ratio (rich, intermediate and poor). In the experimental campaign, only...

The unique physical and chemical properties of nano-particles can enhance the nature of cement-based materials at the micro-scale and nano-scale levels, leading to improved properties. To uncover the strengthening mechanism associated with various types of nano-particles, a laboratory investigation was undertaken to evaluate and compare the influen...

This paper presents results obtained in tensile tests performed in steel reinforcing bars with different diameters extracted from columns exposed for 240 minutes to the standard fire curve prescribed by ISO 834-1:1999. The square columns were 300 cm long and had a width of 25 mm. The longitudinal reinforcement consisted of 10 mm and 16 mm-diameter...

The necessity to reduce the consumption of cement in cementitious composites is a worldwide concern and the partial replacement of cement with industrial waste has gathered considerable interest. One type of industrial waste is glass, which is rich in amorphous silica but can present problems with its use due to the alkali-silica reaction (ASR). Th...

RESUMO A segurança contra incêndio das edificações é uma necessidade de projeto. As edificações avançam em altura e área, contando com grandes demandas de instalações, obrigando a indústria da construção civil a desenvolver sistemas de vedação capazes de impedir a propagação do fogo através das aberturas e juntas, garantindo a segurança dos usuário...

The maturity method is a procedure that associates the evolution of the temperature of concrete cast to the structure and the evolution of its hardened state properties like compressive strength, usually at early ages. Its use is justified when safety and agility are required for activities like prestressing, shoring removal, demolding and low temp...

Um dos requisitos abordados pela NBR 15575:2013, mais conhecida por Norma de Desempenho (ND), está relacionado com a durabilidade das edificações e estabelece como método de avaliação o ensaio de Ação de Calor e Choque Térmico (ACCT), que verifica o comportamento de Sistemas de Vedação Vertical Externa (SVVE) frente a mudanças bruscas de temperatur...

The discussion on fire safety is necessary in Brazilian buildings. Current legislation requires construction with compartmentalized areas separated by walls with structural ceramic blocks capable of resisting fire for an amount of time pre-determined in norm NBR 14432 (ABNT, 2001). However, a lack of building standards requires experimental tests a...

This paper aims at investigating the behavior of structural grouts with partial replacement of the natural coarse aggregate by 50% of ceramic waste (CW). Five mixtures were dosed, varying in the addition of CW replacement, hydrated lime and superplasticizer. The fresh and hardened properties of each composite were analyzed through the slump test, c...

The discussion on fire safety is necessary in Brazilian buildings. Current legislation requires construction with compartmentalized areas separated by walls with structural ceramic blocks capable of resisting fire for an amount of time predetermined in norm NBR 14432 (ABNT, 2001). However, a lack of building standards requires experimental tests ac...

Meeting passive and active protection requirements in buildings has brought about demands for new systems, materials, equipment, and even design requirements like the access to housing units with doors that have a minimum fire-resistance rating of 30 minutes. For existing buildings, though, it is not always possible to adapt them to current governm...

O concreto armado é amplamente estudado em relação ao controle tecnológico, onde geralmente é realizado o ensaio de resistência à compressão para verificar a conformidade com o estabelecido em projeto e como uma estimativa confiável do potencial de durabilidade do material. Antes da realização desse ensaio, as amostras são mantidas em condição isot...

Core sampling for testing is considered a reliable method to provide information on structural materials and is one of the most implemented techniques in the evaluation of concrete elements. However, core drilling results in a decrease in cross section that can compromise structural mechanical strength even if the extracted section is repaired. Nor...

A durabilidade do concreto armado é um tópico frequentemente abordado dada a sua importância para que o sistema mantenha sua capacidade portante e sustentabilidade. Outro motivo a ser destacado é a necessidade de redução de custos com restaurações, reparos ou substituições. Estudos apresentados nos últimos anos visam desenvolver um novo tipo de con...

Core sampling for testing is considered a reliable method to provide information on structural materials and is one of the most implemented techniques in the evaluation of concrete elements. However, core drilling results in a decrease in cross section that can compromise structural mechanical strength even if the extracted section is repaired. Nor...

Sandwich panels (also known as insulated panels) have been traditionally used for indus-trial buildings and warehouses, but nowadays are being increasingly a favorable choice inbuilding construction, mainly in wall cladding and roofing systems. This paper presentsthe results of an experimental and statistical comparative analysis of Fire Reaction d...

This article presents a method for service life prediction of concrete structures. The proposed method aims to estimate the performance of a concrete structure through its permeability to carbon dioxide penetration, in order to verify its accordance to Brazilian standards. This case study is based on an inspection made in an educational building in...

The improvement of acoustic performance construction systems is crucial. The flaws found during the design of a building are often related to the lack of data that characterize the materials used. Floor slab systems are one of the materials that influence acoustic performance, out of which composite slabs made of ribs and hollow bricks show up as c...

The brittle behavior of concrete can be compensated by the addition of reinforcements, providing benefits such as improved crack control, residual strength and increased flexural strength. It is usual to apply mono fibers to concrete, but their positioning in the matrix may not be homogeneous, consequently increasing the susceptibility to fracture...

Increasing population growth and rise global energy petition have made congregation the requests of energy generation and safety a major challenge global. In another hand nanogeoscience is commencing to develop a viable remediation approach of attention in coal mine drainage (CMD) around spontaneous coal combustion (SCC). On the ecological context,...

Concrete is one of the most important material for civil construction, given its high applicability. C Compressive strength (fc) is one of the main parameters to evaluate the concrete quality. Concrete of the same mixing volume may vary even with the same materials preparation. Concrete specimens molding, and its surface regularization contribute t...

When reinforced concrete elements are subjected to high temperatures, such as in a fire, they are susceptible to physical and chemical changes that cause spalling, thereby undermining their performance under such conditions. It is known that the age and the internal moisture content of concrete are factors that contribute to this event, but the int...