不同烧结温度下污泥基陶粒的孔隙特征及演化规律

Evolution of Pore Characteristics in Sludge Based Ceramsite under Different Sintering Temperatures

摘要:

基于海岛模型提出了陶粒特征孔径演化预测方法，通过试验揭示了烧结制度对陶粒孔隙结构及力学性能的影响机制。结果表明：理论模型能定性反映陶粒孔隙率的变化趋势，结合初始孔洞、冷却气泡融合等因素可进一步提高模型的准确性；温度升高和时间延长会提高陶粒的孔隙率，导致其抗压强度下降；尽管高温烧结促进了珍珠石、钙长石等骨架矿物的生成，但孔隙率增加对陶粒强度的负面效应更为显著。研究结果可以为污泥基陶粒的孔隙调控和性能优化提供一定的理论依据。

Abstract:

Based on the island model， a predictive method for the evolution of pore characteristic in ceramsite was proposed and the influence mechanism of sintering regimes on the pore structure and mechanical properties of ceramsite was revealed through experimental work. The results indicate that the theoretical model can qualitatively reflect the trend of porosity variation， and its accuracy can be furtherly improved by incorporating factors such as initial pores and the fusion of cooling bubbles. Increasing temperature and prolonging sintering time increases porosity， leading to a decline in compressive strength. Although high-temperature sintering promotes the formation of skeletal minerals such as margarite and anorthite， the negative effect of increased porosity on strength is more pronounced. The research findings provide a theoretical basis for pore regulation and performance optimization of sludge based ceramsite.