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Durability of high and ultrahigh performance concrete against high temperatures and leaching by running water
HPC and UHPC are fabricated with a higher amount of cement, smaller w/c ratio and relatively high proportions of silica fume, bleeding agents and fibres. Main microstructural differences of HPC/UHPC are their relatively higher amount of anhydrous particles, smaller porosity (that in the case of UHPC can lead to the total absence of capillary pores) higher microcracking due to autogeneous shrinkage and a higher percentage in volume of paste. The denser microstructure of HPC and UHPC with respect to normal concrete introduces changes in their behaviour, when submitted to aggressive environments. In present work, microstructural changes in several concrete dosages during fire and when in contact with granitic running water are commented. The changes observed due to the attacks are numerous on composition of solid phases, stability of aggregates and fibers, moisture content and microcracking, but not all of them have the same impact in the remaining load-bearing capacity of the concrete. The point to stress then lies in the appraisal of 'damage' in engineering terms and how to link it to the microstructural condition.
Durability of high and ultrahigh performance concrete against high temperatures and leaching by running water
HPC and UHPC are fabricated with a higher amount of cement, smaller w/c ratio and relatively high proportions of silica fume, bleeding agents and fibres. Main microstructural differences of HPC/UHPC are their relatively higher amount of anhydrous particles, smaller porosity (that in the case of UHPC can lead to the total absence of capillary pores) higher microcracking due to autogeneous shrinkage and a higher percentage in volume of paste. The denser microstructure of HPC and UHPC with respect to normal concrete introduces changes in their behaviour, when submitted to aggressive environments. In present work, microstructural changes in several concrete dosages during fire and when in contact with granitic running water are commented. The changes observed due to the attacks are numerous on composition of solid phases, stability of aggregates and fibers, moisture content and microcracking, but not all of them have the same impact in the remaining load-bearing capacity of the concrete. The point to stress then lies in the appraisal of 'damage' in engineering terms and how to link it to the microstructural condition.
Durability of high and ultrahigh performance concrete against high temperatures and leaching by running water
Haltbarkeit von Hochleistungsbeton und Ultrahochleistungsbeton gegenüber hohen Temperaturen und Auslaugen durch fließende Gewässer
Andrade, C. (author) / Alonso, C. (author)
2004
14 Seiten, 5 Bilder, 4 Tabellen, 16 Quellen
Conference paper
English
Durability of ultrahigh-performance concrete
| Tema Archive | 2009
Durability of an Ultrahigh-Performance Concrete
| Online Contents | 2007
Durability of an Ultrahigh-Performance Concrete
| British Library Online Contents | 2007