System concept in design and construction of durable concrete repairs

Emmons, Peter; Vaysburd, Alexander M.

doi:10.1016/0950-0618(95)00065-8

Cited by 47 publications

(29 citation statements)

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“…Tração direta = 18 (3) Tração na flexão = 427 (4) Cisalhamento direto = 1600 (5) Cisalhamento oblíquo = 3.695 (6) …”

Section: Ensaio Equação Da Tensão (Mpa)unclassified

“…Dentre estes requisitos, a compatibilidade é o que determina o funcionamento adequado entre o reparo e a superfície a ser reparada, e que o material de reparo introduzido não vai trazer consequências negativas à construção original no futuro [2]. A principal razão para o não sucesso de reparos estruturais duráveis é o foco exclusivamente na própria fase de reparo, ignorando a consequência deste procedimento sobre o desempenho global da estrutura, quebrando a compatibilidade do sistema [3].…”

Section: Introductionunclassified

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Argamassas de reparo estrutural: Resistência de aderência sob diferentes formas de solicitação

Kudlanvec

Costa

2017

Simpósio Paranaense De Patologia Das Construções

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Resumo: Um sistema adequado de reparo de estruturas de concreto deve apresentar certos requisitos de compatibilidade com a estrutura original no que diz respeito às deformações. Um ponto de fundamental importância no sistema de reparo compatibilizado é a troca de tensões entre matriz e substrato, dada através da aderência entre estes dois meios. A resistência de aderência, fornecida pela matriz através de ligações físicas e químicas é um processo complexo devido à não linearidade de comportamento de elementos cimentíceos. Este estudo tem por objetivo avaliar a resistência de aderência de cinco argamassas industrializadas comercializadas em Curitiba/PR quanto ao seu comportamento sob ação de quatro esforços de natureza diferentes: tração direta, tração na flexão, cisalhamento direto e cisalhamento oblíquo. Para tal, foram utilizados ensaios que simulam o efeito destes esforços adaptando geometricamente os corpos de prova e o plano de aplicação das cargas. Os resultados, comprovados estatisticamente por teste de variância, mostram que o comportamento da aderência das argamassas quando solicitadas por diferentes esforços é significativamente diferente, sendo que as tensões resistentes são beneficiadas quando há plano de compressão sobre a zona de transição. A resistência de aderência ao cisalhamento direto mostrou-se superior à do próprio substrato em quatro argamassas testadas.Palavras-chave: argamassas de reparo, reparo estrutural, aderência, patologia das construções.Abstract: An appropriate concrete structure repair system must have compatibility requirements with the original structure in respect to deformations. A point of fundamental importance in the compatibilized repair system is the exchange of tensions between matrix and substrate, given through the adhesion between these two media. The adhesion resistance provided by the matrix through physical and chemical bonding is a complex process due to nonlinear behavior of cementitious elements. The objective of this study was to evaluate the adhesion strength of five industrialized mortars commercialized in Curitiba/PR, under the influence of four different stresses: direct tensile, flexural tensile, direct shear and oblique shear. For that, we used tests that simulate the effect of these efforts by geometrically adapting the specimens and the directions of the loadings. The results have been statistically proved through an ANOVA test and showed that the adhesion behavior of the mortars when requested by different loadings are significantly different, and the tensile strengths are benefited when there is a compression plane over the transition zone. The direct shear adhesion strength was superior to that of the substrate in four mortars tested.

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“…Tração direta = 18 (3) Tração na flexão = 427 (4) Cisalhamento direto = 1600 (5) Cisalhamento oblíquo = 3.695 (6) …”

Section: Ensaio Equação Da Tensão (Mpa)unclassified

Section: Introductionunclassified

Argamassas de reparo estrutural: Resistência de aderência sob diferentes formas de solicitação

Kudlanvec

Costa

2017

Simpósio Paranaense De Patologia Das Construções

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“…He defines reliability as a ratio of the number of failures to the number of constructed and exploited buildings. P. H. Emmons, A.M. Vaysburd [6] presented the course of the reliability of reinforced concrete structures and also associated problems of repair planning.…”

Section: Review On the State Of Art On Reliabilitymentioning

confidence: 99%

Prediction Reliability of the Building Components as a Model Based on the Distribution of Weibull

Nowogońska¹

2015

JMSS

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All technical objects are at risk of damages during the consecutive years of their usage. Reliability of an object is an essential issue during its usage. The main problem is the strive to eliminate damage formation. Predicting the reliability of an object should allow qualitative and quantitative analysis of the possibility of occurrence of unfavorable events. The adaptation of mathematical models describing the degradation processes in mechanical and electronic devices creates opportunities to develop diagnostic standards for buildings erected in traditional technology. The article presents the methodology of prediction of reliability of a building, and the values of performance features are defined by the parameters of the Weibull distribution function.

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“…The author evaluated the construction technologies of residential buildings in terms of their reliability, and buildings erected in traditional technologies occurred to be the best. Emmons, Vaysburd [7] presented the course of the reliability of reinforced concrete structures and also associated problems of repair planning.…”

Section: Introductionmentioning

confidence: 99%

The Life Cycle of a Building as a Technical Object

Nowogońska

2016

Period. Polytech. Civil Eng.

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In solving problems associated with maintaining buildings in good condition, it is important to recognise the changes in op- IntroductionIn business planning of repairing the buildings one should determine the scope of works. There is no reliable mathematical models that allow the estimation of the operational reliability of a building, often referred to as changes in the building performance. In the case of technical appliances (mechanical and electronic) attempts are undertaken to determine the prediction of their operational reliability, but for buildings -only indicative graphs of changes in performance are presented. The method of behaving and changing the reliability of the building throughout its use will be useful in planning renovations.All appliances are built from parts. Similarly, each building consists of many components. These elements, which fulfil different functions, are made of dissimilar materials, each has different properties, and different durability periods. In order to determine building reliability it is divided into components which are analysed, first separately and then altogether in the entire building. In the process of predicting the reliability of both individual components of a building and a building as a whole, it may be initially assumed that the lifetime of a building is a 100-year time interval.To model a situation for the needs of the survival analysis, when the probability changes in time, the Weibull distribution is most frequently used as a distribution of random variable of the time of the building's usefulness. The probability of the exploitation of a building without any breakdowns in a given period of time is defined as exploitation reliability.

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System concept in design and construction of durable concrete repairs

Cited by 47 publications

References 1 publication

Argamassas de reparo estrutural: Resistência de aderência sob diferentes formas de solicitação

Argamassas de reparo estrutural: Resistência de aderência sob diferentes formas de solicitação

Prediction Reliability of the Building Components as a Model Based on the Distribution of Weibull

The Life Cycle of a Building as a Technical Object

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