Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Sulfate Attack of Cementitious Materials: Volumetric Relations and Expansions
A model was developed which predicts the conditions under which volumetric expansion of cementitious materials are most likely and the amount of expansion expected. Model parameters include concrete composition, phase densities, water-cement ratio, degree of hydration, extent of expansive reaction and reaction stoichiometry. The model was applied to several different reactions involving sulfate attack of concrete, including gypsum and ettringite formation reactions. The model predicted that ettringite formation from monosulfate would not cause general expansion. However, local expansion could occur if ettringite occupied the same space vacated by reacting monosulfate. The model predicted that if sufficient unhydrated tricalcium aluminate (C3A) was available in mature cement paste and it reacted with gypsum to form ettringite, the reaction could cause expansion at low water-to-cement ratios.
Sulfate Attack of Cementitious Materials: Volumetric Relations and Expansions
A model was developed which predicts the conditions under which volumetric expansion of cementitious materials are most likely and the amount of expansion expected. Model parameters include concrete composition, phase densities, water-cement ratio, degree of hydration, extent of expansive reaction and reaction stoichiometry. The model was applied to several different reactions involving sulfate attack of concrete, including gypsum and ettringite formation reactions. The model predicted that ettringite formation from monosulfate would not cause general expansion. However, local expansion could occur if ettringite occupied the same space vacated by reacting monosulfate. The model predicted that if sufficient unhydrated tricalcium aluminate (C3A) was available in mature cement paste and it reacted with gypsum to form ettringite, the reaction could cause expansion at low water-to-cement ratios.
Sulfate Attack of Cementitious Materials: Volumetric Relations and Expansions
J. R. Clifton (Autor:in) / J. M. Ponnersheim (Autor:in)
1994
24 pages
Report
Keine Angabe
Englisch
Materials Degradation & Fouling , Ceramics, Refractories, & Glass , Physical & Theoretical Chemistry , Construction Materials, Components, & Equipment , Cements , Concretes , Sulfates , Environmental effects , Mathematical models , Hydration , Expansion , Volume , Chemical composition , Density(Mass/volume) , Gypsum , Construction materials , Tricalcium aluminate , Chemical reaction mechanisms , Ettringite
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