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Reserch on the Themeral Behavior of Reservoir Sediments under Heating and the Expansion Mechanism of Lightweight Aggregates
Han, Hsieh Chung
This study aims to investigate the generally properties of the fine sediments and its behavior under heating. In the meanwhile, the thermal expansion mechanisms of fine sediments lightweight aggregates are explored. The lightweight aggregates were sintered by using two laboratory kilns, and the physical properties and micro-structure analysis of the aggregates were then carried out. The characteristics of raw material and the heating conditions of sintered lightweight aggregates were evaluated based on the above results. Test result shows that the main mineral composition of the reservoir fine sediments is quartz (56.5%). The chemical composition is suitable for sintering, and the physical properties, such as grain size (D50 = 0.003 mm) and plasticity (P.I. = 14), are also appropriate to produce expansible lightweight aggregates. Sintering temperature and duration affect the properties of aggregates obviously. If the aggregates with large expansion and low density are purposed, keeping the preheat temperature at 500℃ for 7.5 min and the sintering temperature at 1200℃ for 8~12 min are needed. On the other hand, the aggregates with lower porosity (0.9%) and water absorption (0.4%) can be produced while the sintering temperature is high and the duration is long. By the TGA-DTA test results, it can be inferred that the main materials that discharged gas are carbonate and the organic matter.
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