Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Microstructural observations in new matrix glass fibre reinforced cement
Glass fibre reinforced cement (GRC) durability is generally thought to be governed by weakening of the reinforcement by the alkaline matrix and/or precipitation of hydration products, particularly calcium hydroxide (CH), within and around the strands. Previous microstructural investigations of GRC have exclusively used scanning electron microscopy (SEM). This paper is concerned with the application of thin-section petrography (TSP) to GRC. TSP allows identification of CH and other phases associated with the strands and unlike SEM, sample preparation causes minimal interfacial disturbance. Three matrices were studied; OPC, OPC plus metakaolin and OPC plus calcium sulphoaluminate cement. It was found that the degree of composite degradation was unrelated to the amount of CH or other hydration products precipitated within the strands or at the interface. No significant loss of fibre section was observed in degraded composites. It is postulated that gradual enlargement of pre-existing fibre flaws causes strength loss in GRC.
Microstructural observations in new matrix glass fibre reinforced cement
Glass fibre reinforced cement (GRC) durability is generally thought to be governed by weakening of the reinforcement by the alkaline matrix and/or precipitation of hydration products, particularly calcium hydroxide (CH), within and around the strands. Previous microstructural investigations of GRC have exclusively used scanning electron microscopy (SEM). This paper is concerned with the application of thin-section petrography (TSP) to GRC. TSP allows identification of CH and other phases associated with the strands and unlike SEM, sample preparation causes minimal interfacial disturbance. Three matrices were studied; OPC, OPC plus metakaolin and OPC plus calcium sulphoaluminate cement. It was found that the degree of composite degradation was unrelated to the amount of CH or other hydration products precipitated within the strands or at the interface. No significant loss of fibre section was observed in degraded composites. It is postulated that gradual enlargement of pre-existing fibre flaws causes strength loss in GRC.
Microstructural observations in new matrix glass fibre reinforced cement
Purnell, P. (Autor:in) / Short, N.R. (Autor:in) / Page, C.L. (Autor:in) / Majumdar, A.J. (Autor:in)
Cement and Concrete Research ; 30 ; 1747-1753
2000
7 Seiten, 25 Quellen
Aufsatz (Zeitschrift)
Englisch
Microstructural observations in new matrix glass fibre reinforced cement
| Online Contents | 2000
Microstructural observations in new matrix glass fibre reinforced cement
| British Library Online Contents | 2000
Super-critical carbonation of glass-fibre reinforced cement. Part 2: Microstructural observations
| British Library Online Contents | 2003
| TIBKAT | 1974