Microstructure of interface between fibre and matrix in 10-year aged GRC modified by calcium sulfoaluminate cement |
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| Affiliation: | 1. Buzzi Unicem S.p.A., Via L. Buzzi 6, 15033 Casale Monferrato (AL), Italy;2. Wilhelm Dyckerhoff Institut für Baustofftechnologie, Dyckerhoffstraβe 7, 65203 Wiesbaden, Germany;3. Dipartimento di Scienze ed Innovazione Tecnologica, Università del Piemonte Orientale A. Avogadro, Viale T. Michel 11, 15121 Alessandria, Italy;1. Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK;2. Sector of Decommissioning and Radioactive Waste Management, Japan Atomic Energy Agency, Tokai, Japan |
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| Abstract: | Time-dependent property changes in glass fibre reinforced cement (GRC) mainly result from a combination of the alkalinity of the matrix and densification of the matrix (e.g. due to calcium hydroxide precipitation) within and around the glass fibre strands. The microstructure of the interface between matrix and fibres in GRC has a significant impact on its durability. This paper describes a study of two GRC formulations (with OPC, and OPC plus calcium sulfoaluminate based matrices) aged for 10 years at 25 °C. Thin-section petrography (TSP) and SEM are used to compare the microstructure of both polished surfaces and fractured surfaces. The aged OPC/GRC demonstrates significantly brittle behaviour with substantial densification of C–S–H/CH intermixture occurring around glass fibres. In contrary, the aged composite made with the OPC plus calcium sulfoaluminate shows greatly retained toughness, accompanied by considerably flexible interfacial and interfilamentary areas around the glass fibres. |
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