Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Performance of concrete with blended binders in sulfuric acid and ammonium sulphate solutions
Acid attacks on concrete impart unique set of damage mechanisms and manifestations compared to other durability issues of concrete. Up to date, there are still research gaps and conflicting data regarding the effects of supplementary cementitious materials (SCMs) at improving the resistance of concrete to acidic exposures. Hence, this thesis aims at understanding the role of SCMs in the performance of concrete under two different acidic environments (sulfuric acid and ammonium sulfate solutions) that produce similar reaction products while their damage mechanisms and manifestations are completely different. Concrete has long been the most popular choice for constructing key infrastructural elements such as sewer pipes, water treatment facilities, industrial floors and foundations, which can be chemically vulnerable to damage by sulfuric acid attack. Since high alkalinity is required for the stability of the cementitious matrix, concrete is susceptible to attack by acidic media, which may disintegrate the hydrated cement paste to various levels based on the prevailing exposure conditions and key mixture design parameters of concrete. The aim of this part of research was to investigate the response, in terms of phyico-mechanical and microstructural features, of concrete comprising different types of cement (general use or portland limestone cement [PLC]) with various combinations of SCMs (fly ash, silica fume and nano-silica) to a severe sulfuric acid exposure. The project comprised 13 weeks (90 days) of immersing test specimens in 5% sulfuric acid solutions with a maximum pH threshold of 2.0. The results revealed that the surface degradation (mass loss) of concrete under severe sulfuric acid attack was independent of its penetrability (physical resistance), since very dense cementitious matrices (low penetrability) suffered from severe deterioration. Portland limestone cement [PLC] may slightly improve the resistance of concrete to sulfuric acid attack, whereas among the blended binders tested, binary binders ...
Performance of concrete with blended binders in sulfuric acid and ammonium sulphate solutions
Acid attacks on concrete impart unique set of damage mechanisms and manifestations compared to other durability issues of concrete. Up to date, there are still research gaps and conflicting data regarding the effects of supplementary cementitious materials (SCMs) at improving the resistance of concrete to acidic exposures. Hence, this thesis aims at understanding the role of SCMs in the performance of concrete under two different acidic environments (sulfuric acid and ammonium sulfate solutions) that produce similar reaction products while their damage mechanisms and manifestations are completely different. Concrete has long been the most popular choice for constructing key infrastructural elements such as sewer pipes, water treatment facilities, industrial floors and foundations, which can be chemically vulnerable to damage by sulfuric acid attack. Since high alkalinity is required for the stability of the cementitious matrix, concrete is susceptible to attack by acidic media, which may disintegrate the hydrated cement paste to various levels based on the prevailing exposure conditions and key mixture design parameters of concrete. The aim of this part of research was to investigate the response, in terms of phyico-mechanical and microstructural features, of concrete comprising different types of cement (general use or portland limestone cement [PLC]) with various combinations of SCMs (fly ash, silica fume and nano-silica) to a severe sulfuric acid exposure. The project comprised 13 weeks (90 days) of immersing test specimens in 5% sulfuric acid solutions with a maximum pH threshold of 2.0. The results revealed that the surface degradation (mass loss) of concrete under severe sulfuric acid attack was independent of its penetrability (physical resistance), since very dense cementitious matrices (low penetrability) suffered from severe deterioration. Portland limestone cement [PLC] may slightly improve the resistance of concrete to sulfuric acid attack, whereas among the blended binders tested, binary binders ...
Performance of concrete with blended binders in sulfuric acid and ammonium sulphate solutions
01.06.2016
Hochschulschrift
Elektronische Ressource
Englisch
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