Utilize este identificador para referenciar este registo: http://hdl.handle.net/1822/38179

TítuloPerformance of a fly ash geopolymeric mortar for coating of ordinary portland cement concrete exposed to harsh chemical environments
Autor(es)Tahri, W.
Abdollahnejad, Zahra
Mendes, J.
Torgal, Fernando Manuel Alves Silva Pacheco
Aguiar, J. L. Barroso de
Palavras-chaveAcid attack
Coatings
Concrete infrastructures
Geopolymers
Portland cement concrete
DataSet-2015
EditoraTrans Tech Publications
RevistaAdvanced Materials Research
CitaçãoTahri W., Abdollahnejad Z., Mendes J., Torgal F. P., Aguiar J. Performance of a Fly Ash Geopolymeric Mortar for Coating of Ordinary Portland Cement Concrete Exposed to Harsh Chemical Environments, Advanced Materials Research, Vol. 1129, pp. 573-580, doi:10.4028/www.scientific.net/AMR.1129.573, 2015
Resumo(s)Premature degradation of ordinary Portland cement (OPC) concrete infrastructures is a current and serious problem with overwhelming costs amounting to several trillion dollars. The use of concrete surface treatments with waterproofing materials to prevent the access of aggressive substances is an important way of enhancing concrete durability. The most common surface treatments use polymeric resins based on epoxy, silicone (siloxane), acrylics, polyurethanes or polymethacrylate. However, epoxy resins have low resistance to ultraviolet radiation while polyurethanes are sensitive to high alkalinity environments. Geopolymers constitute a group of materials with high resistance to chemical attack that could also be used for coating of concrete infrastructures exposed to harsh chemical environments. This article presents results of an experimental investigation on the resistance to chemical attack (by sulfuric and nitric acid) of several materials: OPC concrete, high performance concrete (HPC), epoxy resin, acrylic painting and a fly ash based geopolymeric mortar. Three types of acids, each with high concentrations of 10%, 20% and 30%, were used to simulate long term degradation by chemical attack. The results show that the epoxy resin had the best resistance to chemical attack, irrespective of the acid type and acid concentration.
Tipoarticle
URIhttp://hdl.handle.net/1822/38179
Arbitragem científicayes
AcessoopenAccess
Aparece nas coleções:C-TAC - Artigos em Revistas Internacionais

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