Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
The influence of C4A3S content and W/S ratio on the performance of calcium sulfoaluminate-based cements
The effect of the variation in (4CaO)(3Al2O3)(SO3) content (expressed as (4CaO)(3Al2O3)(SO3)/(5CaO)(2Al2O3)(SO3) weight ratio ranging from 1:5 to 3:1) on the ternary system (4CaO)(3Al2O3)(SO3)-(5CaO)(2Al2O3)(SO3)-CaSO4 having a constant CaSO4/(4CaO)(3Al2O3)(SO3) ratio of 0.5, has been studied. At the fixed water/solid ratio of 0.4 the mechanical strength of the system at early ages (1 day to 28 days) increased with higher (4CaO)(3Al2O3)(SO3) content. However, depending on the curing conditions, compositions containing more than 50 % (4CaO)(3Al2O3)(SO3) showed expansion, cracking and loss of strength at later ages, due to the insufficient water used. Moreover compositions with more than 20 % (4CaO)(3Al2O3)(SO3) and increasing (4CaO)(3Al2O3)(SO3) content gave progressively lower mechanical strength, when hydrated with the fixed water/reactants ((4CaO)(3Al2O3)(SO3) + CaSO4) ratio of 0.86, i.e. 10 % more than the stoichiometric water requirement. Thus, both (4CaO)(3Al2O3)(SO3) content and water/solid ratio must be optimized in order to achieve satisfactory performances at early and later ages. The best behaviour was obtained with cements containing 30 % to 40 % (4CaO)(3Al2O3)(SO3) hydrated with a water/solid ratio ranging from about 0.35 to 0.50.
The influence of C4A3S content and W/S ratio on the performance of calcium sulfoaluminate-based cements
The effect of the variation in (4CaO)(3Al2O3)(SO3) content (expressed as (4CaO)(3Al2O3)(SO3)/(5CaO)(2Al2O3)(SO3) weight ratio ranging from 1:5 to 3:1) on the ternary system (4CaO)(3Al2O3)(SO3)-(5CaO)(2Al2O3)(SO3)-CaSO4 having a constant CaSO4/(4CaO)(3Al2O3)(SO3) ratio of 0.5, has been studied. At the fixed water/solid ratio of 0.4 the mechanical strength of the system at early ages (1 day to 28 days) increased with higher (4CaO)(3Al2O3)(SO3) content. However, depending on the curing conditions, compositions containing more than 50 % (4CaO)(3Al2O3)(SO3) showed expansion, cracking and loss of strength at later ages, due to the insufficient water used. Moreover compositions with more than 20 % (4CaO)(3Al2O3)(SO3) and increasing (4CaO)(3Al2O3)(SO3) content gave progressively lower mechanical strength, when hydrated with the fixed water/reactants ((4CaO)(3Al2O3)(SO3) + CaSO4) ratio of 0.86, i.e. 10 % more than the stoichiometric water requirement. Thus, both (4CaO)(3Al2O3)(SO3) content and water/solid ratio must be optimized in order to achieve satisfactory performances at early and later ages. The best behaviour was obtained with cements containing 30 % to 40 % (4CaO)(3Al2O3)(SO3) hydrated with a water/solid ratio ranging from about 0.35 to 0.50.
The influence of C4A3S content and W/S ratio on the performance of calcium sulfoaluminate-based cements
Einfluß des (4CaO)(3Al2O3)(SO3)-Gehaltes und des Wasser-Feststoff-Wertes auf das Verhalten von Zementen auf Calciumsulfoaluminatbasis
Beretka, J. (Autor:in) / Marroccoli, M. (Autor:in) / Sherman, N. (Autor:in) / Valenti, G.L. (Autor:in)
Cement and Concrete Research ; 26 ; 1673-1681
1996
9 Seiten, 4 Bilder, 4 Tabellen, 29 Quellen
Aufsatz (Zeitschrift)
Englisch
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