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This chapter proposes a mathematical model for estimating the concrete carbonation depth and predicting the service life of concrete structures subject to CO2 action, with easily obtainable input data. The input variables are divided into three groups: concrete properties (concrete compressive strength at 28 days, type of cement used, content and type mineral admixture); exposure conditions (a structure is indoors or outdoors, protected or not from rain) and environmental conditions (relative humidity and CO2 content). The model was obtained by coupling the concrete conduct equations reported in the literature, especially the first Fick’s Law. To adjust the model’s coefficients and parameters, 1298 data obtained through experts’ knowledge were used. The model determination coefficient was 0.9860, and the root-mean-square error (RMSE) was 0.3 mm. The model was validated using 298 data of the natural carbonation available in the literature, representing 87% of tested data. The results indicate that the model has the potential to predict the concrete carbonation depth for the boundary conditions that guided its development. It also presents itself as a potential tool for determining the concrete carbonation depth and service life prediction of new or existing structures.
E. Possan; J. J. O. Andrade; D. C. C. Dal Molin; José Luis Duarte Ribeiro. Model to Estimate Concrete Carbonation Depth and Service Life Prediction. Hygrothermal Behaviour and Building Pathologies 2020, 67 -97.
AMA StyleE. Possan, J. J. O. Andrade, D. C. C. Dal Molin, José Luis Duarte Ribeiro. Model to Estimate Concrete Carbonation Depth and Service Life Prediction. Hygrothermal Behaviour and Building Pathologies. 2020; ():67-97.
Chicago/Turabian StyleE. Possan; J. J. O. Andrade; D. C. C. Dal Molin; José Luis Duarte Ribeiro. 2020. "Model to Estimate Concrete Carbonation Depth and Service Life Prediction." Hygrothermal Behaviour and Building Pathologies , no. : 67-97.
The construction industry is responsible for large volumes of raw material extraction for cement manufacturing, and also disposes of construction and demolition wastes (CDW) in landfills. The pervious concrete is considered a sustainable alternative for pavement, since its main characteristic is to permeate the water, allowing its reuse. In this sense, for an adequate use it is necessary to optimize its properties in its dimensioning and maintenance to avoid the clogging of its voids. In this way, the main purpose of this research was to analyze the use of recycled aggregates (RA) from construction and demolition waste and fly ash in pervious concrete. Thus, two series of pervious concretes, one with a w/b ratio of 0.25, 0.30, and other keeping w/b ratio constant (0.30) and 10% of cement replacement by fly ash were investigated, all with replacement of natural by recycled aggregate (25, 50, 75 and 100%). Clogging, surface abrasion test, compressive and flexural strength, permeability coefficient, infiltration rate, scanning electron microscopy (SEM) and x-ray microtomography were performed. The results showed that the incorporation of 10% fly ash in pervious concrete with 75% of recycled aggregate content showed an increase of 6% tendency to clogging compared to the reference pervious concrete. In addition, the higher levels of recycled aggregate showed a greater tendency to clogging in samples, where the highest tendency was found in the 50% replacement concrete, while the reference concrete was 46% less susceptible to clogging. It was verified that the increase of the recycled aggregate content in pervious concrete provided the increase of surface abrasion. The microstructural investigation showed a good relationship between the macrostructural properties and the void content in pervious concretes.
Gabrieli Lazzari Vieira; Jéssica Zamboni Schiavon; Pietra Moraes Borges; Sérgio Roberto da Silva; Jairo Andrade. influence of recycled aggregate replacement and fly ash content in performance of pervious concrete mixtures. Journal of Cleaner Production 2020, 271, 122665 .
AMA StyleGabrieli Lazzari Vieira, Jéssica Zamboni Schiavon, Pietra Moraes Borges, Sérgio Roberto da Silva, Jairo Andrade. influence of recycled aggregate replacement and fly ash content in performance of pervious concrete mixtures. Journal of Cleaner Production. 2020; 271 ():122665.
Chicago/Turabian StyleGabrieli Lazzari Vieira; Jéssica Zamboni Schiavon; Pietra Moraes Borges; Sérgio Roberto da Silva; Jairo Andrade. 2020. "influence of recycled aggregate replacement and fly ash content in performance of pervious concrete mixtures." Journal of Cleaner Production 271, no. : 122665.
The increasing accumulation of tire waste has become a social environmental and public health problem because rubber degradation is extremely difficult to achieve and time consuming. The incorporation of rubber waste in concrete has become a recourse to assist in the disposal of this solid waste. This investigation evaluated the influence of a chemical pretreatment with sodium hydroxide solution (NaOH) on the physical, mechanical, microstructural properties of concretes with two rubber residue contents (15% and 30%) as a natural fine aggregate replacement, and the addition of silica fume (7.5% and 15%) to replace Portland cement. X-ray microtomography and scanning electron microscopy were used to investigate the influence of treatment rubber and silica fume in the microstructure of concretes. The use of rubber in the cement matrix, regardless of the treatment (or lack thereof), decreases the concrete density (lower 10.5%) and compressive strength at 28 d (54%), besides the increase the porosity (18%) than reference concretes. The rubber pre-treatment did not significantly influence the concrete behavior. In contrast, the use of silica fume showed significant compressive strength gains, up to 80% for concretes with 30% of rubber replacement at 28 days. These gains were confirmed by the microstructural analysis and the densification of the interfacial transition zone.
Cauana Melo Copetti; Pietra Moraes Borges; Jéssica Zamboni Squiavon; Sérgio Roberto da Silva; Jairo José De Oliveira Andrade. Evaluation of tire rubber surface pre-treatment and silica fume on physical-mechanical behavior and microstructural properties of concrete. Journal of Cleaner Production 2020, 256, 120670 .
AMA StyleCauana Melo Copetti, Pietra Moraes Borges, Jéssica Zamboni Squiavon, Sérgio Roberto da Silva, Jairo José De Oliveira Andrade. Evaluation of tire rubber surface pre-treatment and silica fume on physical-mechanical behavior and microstructural properties of concrete. Journal of Cleaner Production. 2020; 256 ():120670.
Chicago/Turabian StyleCauana Melo Copetti; Pietra Moraes Borges; Jéssica Zamboni Squiavon; Sérgio Roberto da Silva; Jairo José De Oliveira Andrade. 2020. "Evaluation of tire rubber surface pre-treatment and silica fume on physical-mechanical behavior and microstructural properties of concrete." Journal of Cleaner Production 256, no. : 120670.
The main objective of this paper is to use the techniques and methods of Product Process Development in the equipment development for a technology-based small business. Conceptual design concepts were generated and through the use of a morphological matrix the options of confection of the final conceptual prototype were verified. With the definition of the previous steps, the project team cataloged the main requirements and functions of the equipment and compared and evaluated them with a reference concept already used in the external environment of the company, verifying their priorities through the Mudge Method. Subsequently, the study of the needs of improvements in the main functions was done creating a final functional prototype for use in the work environment. The application of these techniques allowed quantifying the productivity of the product manufactured by equipment, comparing the situation before and after the process with the new equipment. In addition it was verified that when the process is carried out by the equipment developed there is a productivity improvement since this allowed to reduce the amount of losses; decrease production variability over time, since there is no operator wear and more results standardization.
Felipe Mello Pierobom; Jairo José De Oliveira Andrade. Application of product development tools in equipment design for a technology-based small business. Gestão & Produção 2020, 27, 1 .
AMA StyleFelipe Mello Pierobom, Jairo José De Oliveira Andrade. Application of product development tools in equipment design for a technology-based small business. Gestão & Produção. 2020; 27 (2):1.
Chicago/Turabian StyleFelipe Mello Pierobom; Jairo José De Oliveira Andrade. 2020. "Application of product development tools in equipment design for a technology-based small business." Gestão & Produção 27, no. 2: 1.
The overall equipment effectiveness (OEE) is an indicator used in the management and continuous improvement of production systems, and is useful in identifying losses, thus reducing production costs. By analyzing the results of this indicator, the operation manager must make decisions to eliminate or reduce losses in the process. This study investigated the application of the OEE indicator in one production line in the pulp and paper industry. The implementation of OEE was performed in stages with a detailed analysis of the indicators that compose the OEE (quality, performance, and availability) to identify possible improvements. Thus, actions were implemented to improve the OEE quality index. This study provided important information that enabled the operation manager to diagnose and minimize the occurrence of failures and losses, which is often hidden and unknown to those involved in the production system.
Jairo J .O Andrade; Daniel Dreher Silveira. Application of OEE for productivity analysis: a case study of a production line from the pulp and paper industry. DYNA 2019, 86, 9 -16.
AMA StyleJairo J .O Andrade, Daniel Dreher Silveira. Application of OEE for productivity analysis: a case study of a production line from the pulp and paper industry. DYNA. 2019; 86 (211):9-16.
Chicago/Turabian StyleJairo J .O Andrade; Daniel Dreher Silveira. 2019. "Application of OEE for productivity analysis: a case study of a production line from the pulp and paper industry." DYNA 86, no. 211: 9-16.
Luis Gabriel Graupner de Godoy; Abrahão Bernardo Rohden; Mônica Regina Garcez; Eugênio Bastos da Costa; Silvana Da Dalt; Jairo José De Oliveira Andrade. Valorization of water treatment sludge waste by application as supplementary cementitious material. Construction and Building Materials 2019, 223, 939 -950.
AMA StyleLuis Gabriel Graupner de Godoy, Abrahão Bernardo Rohden, Mônica Regina Garcez, Eugênio Bastos da Costa, Silvana Da Dalt, Jairo José De Oliveira Andrade. Valorization of water treatment sludge waste by application as supplementary cementitious material. Construction and Building Materials. 2019; 223 ():939-950.
Chicago/Turabian StyleLuis Gabriel Graupner de Godoy; Abrahão Bernardo Rohden; Mônica Regina Garcez; Eugênio Bastos da Costa; Silvana Da Dalt; Jairo José De Oliveira Andrade. 2019. "Valorization of water treatment sludge waste by application as supplementary cementitious material." Construction and Building Materials 223, no. : 939-950.
Reinforced concrete structures are subjected to several degradation processes that often occur early, especially due to reinforcements corrosion. Therefore, the use of representative models for an accurate service-life prediction of reinforced concrete structures becomes indispensable. Thus, this study is aimed at evaluating the model proposed by Andrade to efficiently predict the chloride penetration in concrete structures. In addition, the input variables of this model, as well as the challenges in obtaining them are analyzed. Andrade’s model was applied in some case studies to verify their efficiency in predicting the chloride penetration in reinforced concrete structures in marine environments. The results indicate that for data with small exposure times, the model yielded similar responses to the chloride penetration in situ, with good results within an error range of 35%, associated with a maximum difference of only 4.6 mm between observed and calculated values. For the data with higher exposure times, the differences were significant, indicating the need for an alteration in order to best determine the increase in surface chloride concentration over time. Thus, it is suggested that the model undergoes modifications, mainly in relation to two fundamental aspects, (i) adopt the growth of the chloride surface concentration over time and (ii) consider the variability of the concrete characteristics and exposure conditions through a probabilistic approach.
L. Silvestro; J. J. O. Andrade; D. C. C. Dal Molin. Evaluation of service-life prediction model for reinforced concrete structures in chloride-laden environments. Journal of Building Pathology and Rehabilitation 2019, 4, 20 .
AMA StyleL. Silvestro, J. J. O. Andrade, D. C. C. Dal Molin. Evaluation of service-life prediction model for reinforced concrete structures in chloride-laden environments. Journal of Building Pathology and Rehabilitation. 2019; 4 (1):20.
Chicago/Turabian StyleL. Silvestro; J. J. O. Andrade; D. C. C. Dal Molin. 2019. "Evaluation of service-life prediction model for reinforced concrete structures in chloride-laden environments." Journal of Building Pathology and Rehabilitation 4, no. 1: 20.
Many current industrial processes, such as water treatment, produce large amounts of waste. The water treatment sludge (WTS) must be properly disposed of and/or used as raw material for application in other sectors, such as the construction industry. The rendering mortar production can be an environmentally friendly alternative to recycle the WTS, this being the object of this research. In this way, mortars were produced with 2.5%, 5%, 7.5%, and 10% calcined WTS to replace natural sand. The water absorption, compressive strength, bond strength, and flexural strength properties were evaluated. A natural carbonation was carried out for the determination of CO2 uptake due to carbonation. The results showed that the incorporation of calcined WTS has an influence on all the properties evaluated. Considering 50 years of service life, the CO2 uptake potential for mortar with 10% calcined sludge WTP is 111 kg CO2/t. In the sustainability approach, it was observed that CO2 uptake due to carbonation is higher in mortars with the addition of WTS, and could be an environmentally friendly alternative that compensates emissions from the cementitious materials production.
Jairo José De Oliveira Andrade; Edna Possan; Matheus Chiaradia Wenzel; Sérgio Roberto Da Silva. Feasibility of Using Calcined Water Treatment Sludge in Rendering Mortars: A Technical and Sustainable Approach. Sustainability 2019, 11, 3576 .
AMA StyleJairo José De Oliveira Andrade, Edna Possan, Matheus Chiaradia Wenzel, Sérgio Roberto Da Silva. Feasibility of Using Calcined Water Treatment Sludge in Rendering Mortars: A Technical and Sustainable Approach. Sustainability. 2019; 11 (13):3576.
Chicago/Turabian StyleJairo José De Oliveira Andrade; Edna Possan; Matheus Chiaradia Wenzel; Sérgio Roberto Da Silva. 2019. "Feasibility of Using Calcined Water Treatment Sludge in Rendering Mortars: A Technical and Sustainable Approach." Sustainability 11, no. 13: 3576.
Electric power distribution companies are facing a delicate moment. Privatizations, scarce resources, few investments and harsh penalties due to lack of quality force these companies to seek greater efficiency and control of their processes. Thus, making decisions based only on tacit knowledge and without a clear procedure, like the maintenance company that was part of this study, is not advisable. For this reason, this work aimed to develop a support tool for maintenance decisions, based on failure data and criticality analysis. The FMEA (Failure Mode and Effect Analysis) method was used to discover the riskiest failure modes, and the MAUT (Multi-Attribute Utility Theory) and the Mudge method were used to rank the main criteria used by experts when deciding which transmission line (TL) is in a more critical condition. As a result, the study proposed a tool that guides decision-making in a systematized, impersonal and collective knowledge-based manner for the specific situations encountered in TL maintenance. The results were approved and judged satisfactory by the members of a team of specialists from the maintenance sector.
Anderson S Nunes; Jairo J O Andrade. Use of failure data and criticality analysis in a maintenance management tool for electric power distribution company. DYNA 2019, 86, 199 -205.
AMA StyleAnderson S Nunes, Jairo J O Andrade. Use of failure data and criticality analysis in a maintenance management tool for electric power distribution company. DYNA. 2019; 86 (208):199-205.
Chicago/Turabian StyleAnderson S Nunes; Jairo J O Andrade. 2019. "Use of failure data and criticality analysis in a maintenance management tool for electric power distribution company." DYNA 86, no. 208: 199-205.
RESUMO O presente trabalho tem como objetivo principal investigar a potencialidade do emprego de lodo de estação de tratamento de água (ETA) moído e calcinado em substituição ao agregado miúdo em concretos de cimento Portland, assim evitando o descarte em aterros sanitários e se tornando uma possível alternativa de reutilização desse material. Foram avaliados os efeitos dos teores de substituição de areia pelo lodo de ETA (2,5%, 5%, 7,5% e 10% em massa) e da relação a/c (0,4, 0,5 e 0,6) nas propriedades físicas (massa específica, porosidade e absorção de água por imersão) e mecânicas (resistências à compressão axial e à tração por compressão diametral) em diferentes idades (7, 28 e 91 dias). Todos os dados coletados foram analisados estatisticamente, empregando-se a análise de variância (ANOVA). Os resultados mostraram que, apesar da minimização das propriedades em comparação com o concreto de referência, todos os concretos apresentaram valores de resistência à compressão maiores que 25 MPa, considerando a maior relação a/c (0,60). Sendo assim, com uma dosagem adequada poder-se-á inserir o material em concretos, se consideradas apenas as propriedades analisadas. De uma forma geral, o presente estudo mostra que o lodo de ETA pode ser empregado como agregado miúdo em concretos, sendo uma alternativa válida e sustentável para uso na construção.
Denis Meira Buselatto; Matheus Chirardia Wenzel; Gabriela Holsbach Da Rocha; Jeferson Webber; Sérgio Roberto Da Silva; Jairo José De Oliveira Andrade. Incorporação de lodo de estação de tratamento de água (ETA) como agregado miúdo em concretos: avaliação das propriedades físico-mecânicas. Matéria (Rio de Janeiro) 2019, 24, 1 .
AMA StyleDenis Meira Buselatto, Matheus Chirardia Wenzel, Gabriela Holsbach Da Rocha, Jeferson Webber, Sérgio Roberto Da Silva, Jairo José De Oliveira Andrade. Incorporação de lodo de estação de tratamento de água (ETA) como agregado miúdo em concretos: avaliação das propriedades físico-mecânicas. Matéria (Rio de Janeiro). 2019; 24 (1):1.
Chicago/Turabian StyleDenis Meira Buselatto; Matheus Chirardia Wenzel; Gabriela Holsbach Da Rocha; Jeferson Webber; Sérgio Roberto Da Silva; Jairo José De Oliveira Andrade. 2019. "Incorporação de lodo de estação de tratamento de água (ETA) como agregado miúdo em concretos: avaliação das propriedades físico-mecânicas." Matéria (Rio de Janeiro) 24, no. 1: 1.
The disposal and treatment of certain wastes have been neglected by most industries because of economic factors, and the wastes are disposed of at inappropriate locations. Moreover, the use of finite raw materials and their impact has led to the search for alternative materials that can be reused in the construction industry. The present study investigated the mechanical properties (bond strength, compressive strength, and flexural strength), durability (water absorption), and microstructural analysis of rendering mortars with different levels of replacement (2.5 wt%, 5 wt%, 7.5 wt%, and 10 wt%) of natural sand by water treatment sludge aggregate. The results were statistically analyzed through mathematical models and analysis of variance. It is evident from this study that the inclusion of sludge increases the porosity of the mortars, which influences all the physical and mechanical properties. The bond strength, which is the main property of the rendering mortar, showed satisfactory values (> 0.2 MPa) for mortars with 5% of water treatment sludge, despite having high variability. Furthermore, the microstructural analysis showed the influence of particle characteristics on the performance of the mortars with water treatment sludge. Overall, this study showed that the residue, as a source of fine mortar aggregates, could be considered a feasible and sustainable alternative for use in the construction sector.
Jairo José De Oliveira Andrade; Matheus Chiaradia Wenzel; Gabriela Holsbach da Rocha; Sérgio Roberto da Silva. Performance of rendering mortars containing sludge from water treatment plants as fine recycled aggregate. Journal of Cleaner Production 2018, 192, 159 -168.
AMA StyleJairo José De Oliveira Andrade, Matheus Chiaradia Wenzel, Gabriela Holsbach da Rocha, Sérgio Roberto da Silva. Performance of rendering mortars containing sludge from water treatment plants as fine recycled aggregate. Journal of Cleaner Production. 2018; 192 ():159-168.
Chicago/Turabian StyleJairo José De Oliveira Andrade; Matheus Chiaradia Wenzel; Gabriela Holsbach da Rocha; Sérgio Roberto da Silva. 2018. "Performance of rendering mortars containing sludge from water treatment plants as fine recycled aggregate." Journal of Cleaner Production 192, no. : 159-168.
Este artigo apresenta a análise de confiabilidade de equipamentos de uma planta de destilação em uma empresa de refino de petróleo, aonde foram coletados e analisados dados de falha desde 1992. Foi possível notar quais as falhas mais impactantes e perceber que as falhas de selagem ocorrem com uma frequência superior à esperada, bem como notar que este modo de falha se encontra na fase de desgaste da curva da banheira. Em posse destes dados foi possível sugerir uma modificação no plano de selagem, no que se refere às atividades de manutenção. Foi possível também sugerir uma mudança na frequência de avaliações preditivas a fim de otimizar a utilização dos recursos de manutenção.
Moisés Santos; Jairo José De Oliveira Andrade. Aplicação da Confiabilidade para o Direcionamento das Atividades de Manutenção para Equipamentos Rotativos em uma Indústria de Refino de Petróleo. Produto & Produção 2018, 18, 1 .
AMA StyleMoisés Santos, Jairo José De Oliveira Andrade. Aplicação da Confiabilidade para o Direcionamento das Atividades de Manutenção para Equipamentos Rotativos em uma Indústria de Refino de Petróleo. Produto & Produção. 2018; 18 (2):1.
Chicago/Turabian StyleMoisés Santos; Jairo José De Oliveira Andrade. 2018. "Aplicação da Confiabilidade para o Direcionamento das Atividades de Manutenção para Equipamentos Rotativos em uma Indústria de Refino de Petróleo." Produto & Produção 18, no. 2: 1.
Jairo Andrade; Edna Possan; Jéssica Zamboni Squiavon; Tiago Luis Possebon Ortolan. Evaluation of mechanical properties and carbonation of mortars produced with construction and demolition waste. Construction and Building Materials 2018, 161, 70 -83.
AMA StyleJairo Andrade, Edna Possan, Jéssica Zamboni Squiavon, Tiago Luis Possebon Ortolan. Evaluation of mechanical properties and carbonation of mortars produced with construction and demolition waste. Construction and Building Materials. 2018; 161 ():70-83.
Chicago/Turabian StyleJairo Andrade; Edna Possan; Jéssica Zamboni Squiavon; Tiago Luis Possebon Ortolan. 2018. "Evaluation of mechanical properties and carbonation of mortars produced with construction and demolition waste." Construction and Building Materials 161, no. : 70-83.
This paper presents a conceptual framework methodology concerning service life prediction of concrete structures by using deterministic or probabilistic processes, which are included from collecting data until the decision-making. This methodology provides guidelines to generate new degradation models and accomplish new service life studies of either existing structures or new ones in literature. In the first case, it is possible to estimate how many years are necessary for the structure to reach the desired limit state (durability, service or of security). It can also provide support in project design by selecting durability requirements such as covering thickness, concrete strength, type of cement, water–cement ratio, among other factors that influence the service life of concrete structures.
E. Possan; D. C. C. Dal Molin; J. J. O. Andrade. A conceptual framework for service life prediction of reinforced concrete structures. Journal of Building Pathology and Rehabilitation 2018, 3, 2 .
AMA StyleE. Possan, D. C. C. Dal Molin, J. J. O. Andrade. A conceptual framework for service life prediction of reinforced concrete structures. Journal of Building Pathology and Rehabilitation. 2018; 3 (1):2.
Chicago/Turabian StyleE. Possan; D. C. C. Dal Molin; J. J. O. Andrade. 2018. "A conceptual framework for service life prediction of reinforced concrete structures." Journal of Building Pathology and Rehabilitation 3, no. 1: 2.
Jairo José De Oliveira Andrade; Guilherme Camargo Boldo. Influence of stone dust as fine aggregate replacement on concrete compressive strength using an analysis of variance (ANOVA). MOJ Civil Engineering 2018, 4, 138 -141.
AMA StyleJairo José De Oliveira Andrade, Guilherme Camargo Boldo. Influence of stone dust as fine aggregate replacement on concrete compressive strength using an analysis of variance (ANOVA). MOJ Civil Engineering. 2018; 4 (3):138-141.
Chicago/Turabian StyleJairo José De Oliveira Andrade; Guilherme Camargo Boldo. 2018. "Influence of stone dust as fine aggregate replacement on concrete compressive strength using an analysis of variance (ANOVA)." MOJ Civil Engineering 4, no. 3: 138-141.
RESUMO O presente trabalho tem como objetivo principal investigar a potencialidade do emprego de lodo de estação de tratamento de água (ETA) moído e calcinado em substituição ao agregado miúdo em concretos de cimento Portland, assim evitando o descarte em aterros sanitários e se tornando uma possível alternativa de reutiliza-ção desse material. Foram avaliados os efeitos dos teores de substituição de areia pelo lodo de ETA (2,5%, 5%, 7,5% e 10% em massa) e da relação a/c (0,4, 0,5 e 0,6) nas propriedades físicas (massa específica, poro-sidade e absorção de água por imersão) e mecânicas (resistências à compressão axial e à tração por compres-são diametral) em diferentes idades (7, 28 e 91 dias). Todos os dados coletados foram analisados estatistica-mente, empregando-se a análise de variância (ANOVA). Os resultados mostraram que, apesar da minimiza-ção das propriedades em comparação com o concreto de referência, todos os concretos apresentaram valores de resistência à compressão maiores que 25 MPa, considerando a maior relação a/c (0,60). Sendo assim, com uma dosagem adequada poder-se-á inserir o material em concretos, se consideradas apenas as propriedades analisadas. De uma forma geral, o presente estudo mostra que o lodo de ETA pode ser empregado como agregado miúdo em concretos, sendo uma alternativa válida e sustentável para uso na construção.
Denis Meira Buselatto; Matheus Chirardia Wenzel; Gabriela Holsbach Da Rocha; Jeferson Webber; Sérgio Roberto Da Silva; Jairo José De Oliveira Andrade. Incorporação de lodo de estação de tratamento de água (ETA) como agregado miúdo em concretos: avaliação das propriedades físico-mecânicas. Matéria (Rio de Janeiro) 2018, 23, 1 .
AMA StyleDenis Meira Buselatto, Matheus Chirardia Wenzel, Gabriela Holsbach Da Rocha, Jeferson Webber, Sérgio Roberto Da Silva, Jairo José De Oliveira Andrade. Incorporação de lodo de estação de tratamento de água (ETA) como agregado miúdo em concretos: avaliação das propriedades físico-mecânicas. Matéria (Rio de Janeiro). 2018; 23 (3):1.
Chicago/Turabian StyleDenis Meira Buselatto; Matheus Chirardia Wenzel; Gabriela Holsbach Da Rocha; Jeferson Webber; Sérgio Roberto Da Silva; Jairo José De Oliveira Andrade. 2018. "Incorporação de lodo de estação de tratamento de água (ETA) como agregado miúdo em concretos: avaliação das propriedades físico-mecânicas." Matéria (Rio de Janeiro) 23, no. 3: 1.
RESUMO O revestimento de argamassa já é utilizado há muitos anos e continua sendo muito empregado ainda nos dias de hoje com o surgimento de novas tendências. Apesar disso, tal subsistema não acompanhou a evolução de outras tecnologias, como o concreto estrutural. Está cada vez mais comum a ocorrência de manifestações patológicas em revestimentos argamassados quando executados sobre estrutura de concreto. Segundo estudos, a ocorrência destas manifestações, especialmente quando aplicado em substratos de concreto, está ligada ao aumento da resistência e da diminuição da porosidade do mesmo. Nesse contexto, este artigo tem como objetivo verificar a perda de aderência de chapiscos com o aumento da resistência do concreto e definir o melhor tipo de chapisco para utilizar sobre este tipo de substrato. Foram moldadas placas de concreto, com variação da resistência característica (fck) de 17,75 MPa, 29,89 MPa e 35,15 MPa. As placas foram chapiscadas com chapisco convencional, rolado e desempenado. Os resultados dos ensaios de aderência comprovaram que o aumento da resistência do concreto reduz a resistência de aderência do revestimento. Os ensaios também mostraram que os chapiscos industrializados se comportam melhor, quando comparado ao convencional, para revestimento de estruturas de concreto. ABSTRACT The mortar coating is already used for many years and remains very still employed in construction. Nevertheless, this subsystem did not follow the evolution of other technologies, such as structural concrete. It is increasingly common occurrence of damages in mortars, mainly when used over a concrete structure. In this context, this article has as objective verifies the adhesion of three slurry mortar types when applied in concretes with different compressive strength. Concrete substrates were produced with compressive strength of 17.75 MPa, 29.89 MPa and 35.15 MPa, where the adhesion tests were performed. The results showed that the increase of concrete strength reduces the adhesive strength, due to the minimization of porosity. Besides, the commercial mortars have better adhesive strength than the manual slurry mortars.
Felipe Allebrand Becker; Jairo José De Oliveira Andrade. Avaliação da influência do substrato de concreto na resistência de aderência à tração de diferentes tipos de chapisco. Matéria (Rio de Janeiro) 2017, 22, 1 .
AMA StyleFelipe Allebrand Becker, Jairo José De Oliveira Andrade. Avaliação da influência do substrato de concreto na resistência de aderência à tração de diferentes tipos de chapisco. Matéria (Rio de Janeiro). 2017; 22 (4):1.
Chicago/Turabian StyleFelipe Allebrand Becker; Jairo José De Oliveira Andrade. 2017. "Avaliação da influência do substrato de concreto na resistência de aderência à tração de diferentes tipos de chapisco." Matéria (Rio de Janeiro) 22, no. 4: 1.
Sérgio Roberto da Silva; Jairo José De Oliveira Andrade. Investigation of mechanical properties and carbonation of concretes with construction and demolition waste and fly ash. Construction and Building Materials 2017, 153, 704 -715.
AMA StyleSérgio Roberto da Silva, Jairo José De Oliveira Andrade. Investigation of mechanical properties and carbonation of concretes with construction and demolition waste and fly ash. Construction and Building Materials. 2017; 153 ():704-715.
Chicago/Turabian StyleSérgio Roberto da Silva; Jairo José De Oliveira Andrade. 2017. "Investigation of mechanical properties and carbonation of concretes with construction and demolition waste and fly ash." Construction and Building Materials 153, no. : 704-715.
Nowadays an amount of reinforced concrete structures are presenting problems related with corrosion of reinforcement, mainly that induced by chloride ions. So, many studies are being accomplished to predict the necessary time for chloride ions reach the reinforcement, beginning the propagation of corrosive process. In this paper, three models were selected for analysis to determine their ability in properly predicting the chloride penetration in concrete structures: the solution of 2nd Fick’s Law, the complete solution of 2nd Fick’s Law, considering the variation of diffusion coefficient and the superficial concentration of chlorides in time; and a model proposed. Analysis of the formulations principles and assessment and applicability of equations were made, taking into account the adequate choice of parameters and variables involved, the difficulty to obtain these parameters, and if the models represent properly the natural phenomena. In order to contribute with the service life prediction of the structures when inserted in saline environments, a mathematical model was developed based in a Focus Groups analysis. Some of the main characteristics of the proposed model are the logic applied for its development and the application easiness. This model was applied in a case study to verify the answer in relation to chloride penetration in some points of a reinforced concrete structure inserted in a saline area. The behavior of the model was consistent with the results of experimental investigations accomplished by other researchers.
J. J. O. Andrade; Edna Possan; D. C. C. Dal Molin. Considerations about the service life prediction of reinforced concrete structures inserted in chloride environments. Journal of Building Pathology and Rehabilitation 2017, 2, 1 .
AMA StyleJ. J. O. Andrade, Edna Possan, D. C. C. Dal Molin. Considerations about the service life prediction of reinforced concrete structures inserted in chloride environments. Journal of Building Pathology and Rehabilitation. 2017; 2 (1):1.
Chicago/Turabian StyleJ. J. O. Andrade; Edna Possan; D. C. C. Dal Molin. 2017. "Considerations about the service life prediction of reinforced concrete structures inserted in chloride environments." Journal of Building Pathology and Rehabilitation 2, no. 1: 1.
Denise Carpena Coitinho Dal Molin; Angela Borges Masuero; Jairo Andrade; Edna Possan; João Ricardo Masuero; Marina Martins Mennucci; Claudio De Souza Kazmierczak; Márcio Minto Fabrício. Contribuição à Previsão da Vida Útil de Estruturas de Concreto. Avaliação de Desempenho de Tecnologias Construtivas Inovadoras: Materiais e Sustentabilidade 2016, 223 -270.
AMA StyleDenise Carpena Coitinho Dal Molin, Angela Borges Masuero, Jairo Andrade, Edna Possan, João Ricardo Masuero, Marina Martins Mennucci, Claudio De Souza Kazmierczak, Márcio Minto Fabrício. Contribuição à Previsão da Vida Útil de Estruturas de Concreto. Avaliação de Desempenho de Tecnologias Construtivas Inovadoras: Materiais e Sustentabilidade. 2016; ():223-270.
Chicago/Turabian StyleDenise Carpena Coitinho Dal Molin; Angela Borges Masuero; Jairo Andrade; Edna Possan; João Ricardo Masuero; Marina Martins Mennucci; Claudio De Souza Kazmierczak; Márcio Minto Fabrício. 2016. "Contribuição à Previsão da Vida Útil de Estruturas de Concreto." Avaliação de Desempenho de Tecnologias Construtivas Inovadoras: Materiais e Sustentabilidade , no. : 223-270.