Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Parameters affecting thaumasite formation in limestone cement mortar
AbstractConcrete made from limestone cement may exhibit a lack of durability due to the formation of thaumasite. This work deals with the factors affecting thaumasite formation in cement mortars and particularly the limestone content, the curing conditions and the type of sand used. Three types of cement were examined: (i) OPC, (ii) Portland limestone cement containing 15% w/w limestone and (iii) Portland limestone cement containing 30% w/w limestone. Mortar specimens were prepared using calcareous and siliceous sand. The specimens were immersed in a 1.8% MgSO4 solution and cured at: (i) 5 °C and (ii) 25 °C. The formation of thaumasite was checked and confirmed by XRD and TGA. In addition visual inspection, strength tests and ultrasonic pulse velocity measurements were carried out for several months. It is concluded that mortars containing limestone, either as sand or as a main constituent of the cement, suffer from the thaumasite form of sulfate attack at low temperature. At room temperature, no sulfate attack was observed after a year of exposure.
Parameters affecting thaumasite formation in limestone cement mortar
AbstractConcrete made from limestone cement may exhibit a lack of durability due to the formation of thaumasite. This work deals with the factors affecting thaumasite formation in cement mortars and particularly the limestone content, the curing conditions and the type of sand used. Three types of cement were examined: (i) OPC, (ii) Portland limestone cement containing 15% w/w limestone and (iii) Portland limestone cement containing 30% w/w limestone. Mortar specimens were prepared using calcareous and siliceous sand. The specimens were immersed in a 1.8% MgSO4 solution and cured at: (i) 5 °C and (ii) 25 °C. The formation of thaumasite was checked and confirmed by XRD and TGA. In addition visual inspection, strength tests and ultrasonic pulse velocity measurements were carried out for several months. It is concluded that mortars containing limestone, either as sand or as a main constituent of the cement, suffer from the thaumasite form of sulfate attack at low temperature. At room temperature, no sulfate attack was observed after a year of exposure.
Parameters affecting thaumasite formation in limestone cement mortar
Kakali, G. (Autor:in) / Tsivilis, S. (Autor:in) / Skaropoulou, A. (Autor:in) / Sharp, J.H. (Autor:in) / Swamy, R.N. (Autor:in)
Cement and Concrete Composites ; 25 ; 977-981
01.01.2003
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Parameters affecting thaumasite formation in limestone cement mortar
| Tema Archiv | 2002
Parameters affecting thaumasite formation in limestone cement mortar
| British Library Conference Proceedings | 2003
Parameters affecting thaumasite formation in limestone cement mortar
| Online Contents | 2003
Use of mineral admixtures to prevent thaumasite formation in limestone cement mortar
| British Library Conference Proceedings | 2003