Long-term performance of surface impregnation of reinforced concrete structures with silane

Christodoulou, Christian; Goodier, Chris I.; Austin, Simon A.; Webb, John; Glass, Gareth K.

doi:10.1016/j.conbuildmat.2013.07.038

Cited by 110 publications

(60 citation statements)

References 18 publications

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“…Early results of this work have also been reported (Christodoulou et al 2012, Christodoulou et al 2013.…”

Section: Introductionsupporting

confidence: 75%

“…Concrete in contact with a salt solution will become contaminated with chlorides primarily due to capillary absorption rather than diffusion alone. Absorbed chlorides can continue to penetrate by diffusion but at a significantly lower movement rate (Christodoulou et al 2013). Thus, measuring the rate of absorption (or sorptivity) can provide useful information on the condition of silane treatments.…”

Section: Laboratory Specimensmentioning

confidence: 99%

See 1 more Smart Citation

Performance of silane impregnants for the protection of reinforced concrete

Christodoulou¹,

Tiplady²,

Goodier³

et al. 2014

Concrete Solutions 2014

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“…Early results of this work have also been reported (Christodoulou et al 2012, Christodoulou et al 2013.…”

Section: Introductionsupporting

confidence: 75%

Section: Laboratory Specimensmentioning

confidence: 99%

Performance of silane impregnants for the protection of reinforced concrete

Christodoulou¹,

Tiplady²,

Goodier³

et al. 2014

Concrete Solutions 2014

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“…From these data, it can be concluded that the main mineral is calcite with ~82 wt%, therefore the historical analyzed stone is limestone. Some of these pores can be developed to form a network of pore spaces by water, gas or ions penetration under natural environmental exposure conditions (Christodoulou, Goodier, Austin, Webb, & Glass, 2013). Ions such as chlorides and sulfates dissolved into water are transported into the pores and fissures by capillary suction, which subsequently cause corrosion of the limestone and ultimately spalling of the surrounding stone face.…”

Section: Resultsmentioning

confidence: 99%

Silane/Siloxane Surface Treatment for Cohesion Ability and Strengthening Agent of Historical Stone

Ershad‐Langroudi

Fadaii²,

Ahmadi³

2017

r Cons Sci J

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Ir Cons Sci J 2017; 1(1): [23][24][25][26][27][28][29][30][31] Silane/siloxane surface treatment are proposed as potential polymeric materials for protective and consolidation coatings of limestone substrates. The silane and silioxane coatings are widely used to strengthen and waterproof of historical monuments. Historical stones are very fragile because of bearing many years in sever weathering conditions. Strengthening historical stones requires paying attention to surface treatment by the aim of decreasing humidity and improvement of mechanical properties. Toward this end, the consolidation coatings using silane and siloxane resins can improve the mechanical properties of historical stones against weathering condition. In this study, two types of coatings based on mixed of silane/siloxane as potential coatings to consolidate historical stones were proposed and the mechanical results were compared with uncoated stones. The mechanical tests approved the silane and siloxane resins can be considered as a proper choice to protect and strengthen historical stones. The results indicated that the contact angle of the coated samples rises up with treating by silane/siloxane resins. This could be due to the presence of organic groups of poly siloxanes act as hydrophobic agents which increase the hydrophobic nature of the surface contact angle. In addition, Si-OH bond of silane as well as consolidation effect can be created the covalent bonding by mineral surface and filling of the small fissures in the stone surfaces.

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“…Um exemplo de informação, ainda que genérica e voltada para a realidade de outro país é sobre o tempo de ação de produtos hidrofugantes de superfície. Christodoulou et al [12], realizando trabalhos de inspeção em viadutos localizados no Reino Unido, construídos na década de 70 e posteriormente tratados com hidrofugante de superfície, demonstraram que o tratamento do concreto armado com silano apresenta eficiência residual comprovada em termos de redução de absorção de água mesmo 20 anos após a aplicação do tratamento. Essa informação gera a reflexão sobre a necessidade de desenvolvimento de ensaios acelerados para embasar a tomada de decisão na especificação de sistemas de proteção nas diversas aplicações de engenharia, mas também de estudar estruturas reais submetidas às intempéries de modo realístico e tentar aprender com estes casos reais e se possível retroalimentar a forma de avaliar os produtos por ensaios acelerados.…”

Section: Proteção De Superfície Sobre Concreto Armadounclassified

Avaliação da eficiência de sistemas de proteção de superfície para concreto: absorção de água, migração de cloretos e ângulo de contato

Medeiros¹,

Pereira²,

Figura³

et al. 2015

Matéria (Rio J.)

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RESUMOA camada de cobrimento do concreto funciona como uma barreira natural ao ingresso de agentes agressivos para o interior do material, dificultando a penetração de íons cloretos, reduzindo a absorção de água e limitando o acesso de oxigênio. Para garantir a eficiência desta camada protetora o uso de tratamentos de superfí-cie mostra-se como uma alternativa viável para prolongar o período de proteção proporcionado pelo cobrimento do concreto. O objetivo deste trabalho é estudar o efeito de proteção de quatro produtos disponíveis no mercado para ser aplicados na proteção de superfície de concretos (cimento quartzoso, epóxi, silicatos, silano/siloxano), bem como comparar os métodos usados para investigar a eficiência de sistemas de proteção. Para isto procedeu-se sobre corpos de prova de concreto, ensaios de absorção por sucção capilar, resistência à penetração de cloretos por migração de íons e medição do ângulo de contato com a água sobre a superfície de concreto protegida ou não. Os produtos estudados apresentaram a capacidade de modificar a interação entre a água e a superfície de contato do concreto. Dentre os produtos estudados, o epóxi é o que apresenta a maior resistência à penetração de cloretos, menor absorção de água por capilaridade e caráter hidrófugo. Com exceção dos silicatos, verificou-se ainda uma boa correlação entre os resultados de absorção de água por capilaridade e o ensaio de migração de íons cloretos. Os produtos Epóxi e a base de silicatos, que apresentaram os menores valores de sortividade, foram os que apresentaram os maiores valores de ângulo de contato, sendo classificados como os de menor afinidade com a água. Palavras-chave:Proteção de superfície, Durabilidade, Concreto armado, Cloretos. ABSTRACTThe thickness of concrete cover acts as a natural protective barrier to the ingress of aggressive agents into the material, hindering the penetration of chloride ions, reducing water absorption and by limiting access of oxygen. To ensure the efficiency of this protective coat the use of surface treatments presents as a viable alternative to extend the period of protection provided by the concrete cover. The aim of this study is to evaluate the protective effect of four products available on the market to be applied on the surface protection of concrete (concrete sealers, epoxy, silicates and silane/siloxane) and compare the methods used to investigate the efficiency of protection systems. Absorption test by capillary suction, chloride penetration resistance by migration of ions and measuring the contact angle with water on the surface of protected concrete were executed. The studied products presented the ability to modify the interaction between the water and the contact surface of the concrete. With the exception of silicate, it was verified a good correlation between the results of water absorption by capillary and chloride ions migration. Among the studied products, the epoxy presents the highest resistance to chloride penetration, lower water absorption by capillarity and water repell...

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Long-term performance of surface impregnation of reinforced concrete structures with silane

Cited by 110 publications

References 18 publications

Performance of silane impregnants for the protection of reinforced concrete

Performance of silane impregnants for the protection of reinforced concrete

Silane/Siloxane Surface Treatment for Cohesion Ability and Strengthening Agent of Historical Stone

Avaliação da eficiência de sistemas de proteção de superfície para concreto: absorção de água, migração de cloretos e ângulo de contato

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