Quantifying environmental effects on cement-rendered facades: A comparison between different degradation indicators

Gaspar, Pedro Lima; Brito, Jorge de

doi:10.1016/j.buildenv.2007.10.022

Cited by 101 publications

(55 citation statements)

References 17 publications

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“…These two man-made materials will offer an interesting contrast with the natural stone as they have different sensitivities to weathering [46]. Concrete also provides a standardisable sample and, unlike natural stone, the degradation of cement tends to a linear path [47].…”

Section: Periodmentioning

confidence: 99%

The design of a legacy indicator tool for measuring climate change related impacts on built heritage

Daly

2016

Herit Sci

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Background:We are experiencing a period of climate change the extent and impact of which is uncertain. In the cultural heritage sector the need for monitoring to inform our understanding is widely agreed, yet there is a lack of consensus over what constitutes 'monitoring for climate change' . This is due, at least in part, to the extended timescales involved. In this paper the design and implementation of one solution is described; a sustainable legacy indicator tool (LegIT) for the long term tracking of surface weathering effects on built heritage. Results:The assessment of climate change impacts requires 30-100 years of data collection, equal to the period referred to as the 'climate norm' by meteorologists. The LegIT is a sacrificial stone object that registers changes in the severity and/or magnitude of weathering patterns on built surfaces, providing a legacy data source for future decision makers. To ensure its sustainability, careful thought was given to the choice of materials, data retrieval and archiving. The tool aims to track surface changes caused by recession, salt crystallisation and microbiological growth. Conclusion:The development and installation of the LegIT is the first long-term exposure trial to be initiated at heritage sites in Ireland and is intended as a legacy for future researchers.

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Section: Periodmentioning

confidence: 99%

The design of a legacy indicator tool for measuring climate change related impacts on built heritage

Daly

2016

Herit Sci

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“…Com base neste cenário, realizou-se este estudo com objetivo de se estabelecer metodologia para avaliação de degradação acelerada de fachadas em laboratório. Assim, com base em outros trabalhos [8][9][10][11][12][13][14][15] obteve-se informações e diretrizes que foram adaptadas e conduziram a definição do método de degradação acelerada. Esse método permitiu obter resultados qualitativos e quantitativos da resistência ao arrancamento apresentado pelo conjunto formado pelo substrato, argamassa e revestimento cerâmico.…”

Section: Introductionunclassified

Efeito De Ciclos Higrotérmicos Na Resistência À Adesão De Sistemas Placas Cerâmicas-Argamassas

Silva¹,

Rodrigues²,

Pelisser³

et al. 2015

Cerind

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ResumoUm dos problemas comuns na indústria da construção é a adesão de revestimentos cerâmicos em fachadas. Vários fatores prejudicam a sua adesão adequada, incluindo: inadequado preenchimento da placa cerâmica, perda de força de tensão de adesão, expansão por umidade da placa, ausência de movimento da junta para absorver a expansão térmica e diferenças mecânicas entre os materiais. Assim, um estudo de degradação acelerada de argamassas em placas cerâmicas aplicados à fachadas foi proposto. Este estudo estabeleceu ciclos para variar a temperatura e umidade de placas de cimento e argamassas comerciais com quantidades variadas de polímero (PVA) e aditivos. Placas cerâmicas do grupo de absorção BIb, de acordo com a Norma Brasileira ABNT NBR 13818:1997, foram usadas. O estudo seguiu planejamento fatorial 2 3 com um ponto central, cujas variáveis foram: quantidade de PVA (3, 5 e 7% em massa) na argamassa e tempo de exposição na máquina de envelhecimento acelerado de 20, 45 e 73 dias. Os resultados mostraram que o tempo de exposição e o teor de PVA na argamassa foram significantes. A resistência à adesão no tempo de exposição de 73 dias variou de 0,144 MPa (3% de PVA) para 0,591 MPA (7% de PVA).Palavras-chave: fachada, PVA, revestimento cerâmico, argamassa colante.

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“…The combined action of wind and rain changes the trajectory of raindrops, the way they impact the surfaces of the facade and the pattern of runoff flow along the facade (Choi, 1999;Gaspar and de Brito, 2008b). In this study, the criteria adopted in the quantification of driven-rain incidence are associated to the level of protection of the façade, since there is no reliable available weather data at a local scale for the sample studied.…”

Section: Exposure To Wind-driven Rainmentioning

confidence: 99%

“…In this study, the defects associated to render facades were grouped into five categories, ranging from A (no visually detectable degradation -most favourable situation) to E (highest degradation level), as shown in (Gaspar, 2009). This degradation index is obtained as the ratio between the extent of the façade degradation -weighted according to the degradation level and the severity of defects -and a reference area, equivalent to the maximum theoretical extent of the degradation for the facade in question (Gaspar and de Brito, 2008b;:…”

Section: Comment [As2]mentioning

confidence: 99%

Probabilistic transition of condition: render facades

Silva

Neves

Gaspar

et al. 2015

Building Research & Information

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. The service life of cement-rendered facades is closely related to the environmental conditions that they are exposed to. The probability distribution is determined for the degradation condition of render facades considering different environmental exposures. A sample of 100 render facades was subjected to meticulous fieldwork to determine their condition. The analysis focuses on the environmental factors that most influence the overall degradation of the facades, evaluated through the condition level. Probabilistic models based on Markov chains are developed to predict the evolution of facade deterioration according to exposure to outdoor environmental conditions. The proposed model provides data on the synergy between the degradation agents and the degradation condition of render facades, the average time of permanence in each degradation level and indications of the effect of degradation on the durability of render that may be applied in the implementation and fine tuning of maintenance procedures. Better understanding the durability of render facades allows a more rational management of their maintenance, contributing to a reduction of their life cycle costs. The proposed stochastic model provides information that can be applied in the context of insurance policies, allowing an evaluation of the risk of failure of coatings. AbstractThe service life of cement-rendered facades is closely related to the environmental conditions that they are exposed to. The probability distribution is determined for the degradation condition

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Quantifying environmental effects on cement-rendered facades: A comparison between different degradation indicators

Cited by 101 publications

References 17 publications

The design of a legacy indicator tool for measuring climate change related impacts on built heritage

The design of a legacy indicator tool for measuring climate change related impacts on built heritage

Efeito De Ciclos Higrotérmicos Na Resistência À Adesão De Sistemas Placas Cerâmicas-Argamassas

Probabilistic transition of condition: render facades

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