Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Microstructure characteristics of cementitious composites at elevated temperatures
This paper presented an experimental study on the microstructural morphology of cementitious composites at high temperatures up to 500 deg C. A real-time SEM was used to observe the evolution of microstructure of neat HCP (hardened cement paste), PFA HCP, neat mortar and PFA mortar exposed to elevated temperatures. The SEM observation was focused on the changes of morphology, microvoids and microcracks with increasing temperatures. The thermal deterioration of HCPs were induced by the dehydration and decomposition of hydration products. The associated evolution of microstructure covered the shrinkage cracks, phase changes of calcium hydroxide and CaO-SiO2-H2O gel. Stressed tests were carried out for comparing the HCPs' resistance against elevated temperatures with using a HTFTM (high temperature fatigue-testing machine). The whole process of thermal deterioration of HCPs was studied with considering both the changes in morphology and the external loads. The results showed PFA HCP has better resistance to high temperature than the neat HCP. The mechanisms of thermal deterioration for all HCPs were discussed with analyzing the changes in microstructural morphology.
Microstructure characteristics of cementitious composites at elevated temperatures
This paper presented an experimental study on the microstructural morphology of cementitious composites at high temperatures up to 500 deg C. A real-time SEM was used to observe the evolution of microstructure of neat HCP (hardened cement paste), PFA HCP, neat mortar and PFA mortar exposed to elevated temperatures. The SEM observation was focused on the changes of morphology, microvoids and microcracks with increasing temperatures. The thermal deterioration of HCPs were induced by the dehydration and decomposition of hydration products. The associated evolution of microstructure covered the shrinkage cracks, phase changes of calcium hydroxide and CaO-SiO2-H2O gel. Stressed tests were carried out for comparing the HCPs' resistance against elevated temperatures with using a HTFTM (high temperature fatigue-testing machine). The whole process of thermal deterioration of HCPs was studied with considering both the changes in morphology and the external loads. The results showed PFA HCP has better resistance to high temperature than the neat HCP. The mechanisms of thermal deterioration for all HCPs were discussed with analyzing the changes in microstructural morphology.
Microstructure characteristics of cementitious composites at elevated temperatures
Mikrostrukturelle Charakteristik von zementartigen Verbundwerkstoffen bei erhöhten Temperaturen
Fu, Y.F. (Autor:in) / Li, W.H. (Autor:in) / Zhang, J.Q. (Autor:in) / Feng, J.J. (Autor:in) / Chen, Z.H. (Autor:in)
2009
6 Seiten, 10 Bilder, 1 Tabelle, 13 Quellen
Aufsatz (Konferenz)
Englisch
Microstructure characteristics of cementitious composites at elevated temperatures
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