Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Thaumasite sulfate attack on concrete: Mechanisms, influential factors and mitigation
Highlights Comprehensive overview for thaumasite sulfate attack (TSA) on concrete. Features of concrete damage due to TSA in laboratory and the field. Discussion of TSA mechanisms, influential factors and code provisions. A proposed mitigation strategy for TSA on concrete.
Abstract Thaumasite sulfate attack (TSA) is a special form of sulfate attack typically occurring due to the availability of carbonates/bicarbonates in the cementitious matrix with abundance of moisture and a prevailing low temperature. It transforms concrete into a non-cohesive mass without any binding or load carrying capacity. Field and laboratory data show that the extent of TSA depends on multiple critical factors including exposure conditions (e.g. type and concentration of sulfate, change of temperature and relative humidity, location of structure/element relative to grade level) and constituents of concrete (e.g. type of cement, inclusion of limestone materials, type and dosage of supplementary cementitious materials). The current paper compiles and analyzes current knowledge/research on the topic from various field and laboratory studies. TSA on concrete is discussed in terms of the mechanisms of damage, test methods, most influential factors and code provisions in North America and Europe. In addition, a mitigation strategy for TSA is proposed based on the balance of physical and chemical resistances of concrete as controlled by key mixture design parameters.
Thaumasite sulfate attack on concrete: Mechanisms, influential factors and mitigation
Highlights Comprehensive overview for thaumasite sulfate attack (TSA) on concrete. Features of concrete damage due to TSA in laboratory and the field. Discussion of TSA mechanisms, influential factors and code provisions. A proposed mitigation strategy for TSA on concrete.
Abstract Thaumasite sulfate attack (TSA) is a special form of sulfate attack typically occurring due to the availability of carbonates/bicarbonates in the cementitious matrix with abundance of moisture and a prevailing low temperature. It transforms concrete into a non-cohesive mass without any binding or load carrying capacity. Field and laboratory data show that the extent of TSA depends on multiple critical factors including exposure conditions (e.g. type and concentration of sulfate, change of temperature and relative humidity, location of structure/element relative to grade level) and constituents of concrete (e.g. type of cement, inclusion of limestone materials, type and dosage of supplementary cementitious materials). The current paper compiles and analyzes current knowledge/research on the topic from various field and laboratory studies. TSA on concrete is discussed in terms of the mechanisms of damage, test methods, most influential factors and code provisions in North America and Europe. In addition, a mitigation strategy for TSA is proposed based on the balance of physical and chemical resistances of concrete as controlled by key mixture design parameters.
Thaumasite sulfate attack on concrete: Mechanisms, influential factors and mitigation
Rahman, M.M. (Autor:in) / Bassuoni, M.T. (Autor:in)
Construction and Building Materials ; 73 ; 652-662
21.09.2014
11 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Thaumasite sulfate attack on concrete: Mechanisms, influential factors and mitigation
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