赤泥磷石膏与水泥协同固化淤泥的力学特性与微观机理 English Version
Mechanical Behavior and Microscopic Mechanism of Soft Clay Stabilized by Red Mud, Phosphogypsum and Cement
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摘要: 在传统水泥固化淤泥的基础上掺入赤泥与磷石膏，以期利用大宗工业固废在水泥-黏土胶凝体系中的潜在化学活性，实现以废治废、减小水泥用量的目标。通过系列无侧限抗压强度试验、固结不排水三轴剪切试验、柔性壁渗透试验和微观测试，明确了淤泥复合固化土的力学性状随赤泥磷石膏配比的演化规律，揭示了复合固化土中的微观耦合效应。/t/n赤泥与磷石膏掺入后可明显改善疏浚泥固化土的力学性能，且二者的协同作用效果显著，最优配比R7.5P2.5条件下固化土的无侧限抗压强度可提升0.8~1.0倍。赤泥的碱源激发作用促进了黏土矿物的溶解与火山灰反应的进行，使得土体的颗粒胶结作用增强，黏聚力增大，而磷石膏促进了钙矾石的生成，提高了孔隙密实程度，土体屈服后的内摩擦角显著增大。此外，磷石膏掺入使得复合固化土的破坏应变大幅提升，塑性变形能力增强。赤泥-磷石膏-水泥复合固化土中存在碱源激发、孔隙充填与胶结破损的耦合作用，土体力学性能的演化规律与微观耦合作用的效应特征相吻合。Abstract: The red mud (RM) and phosphogypsum (PG) were used to stabilize mud with traditional cement in this study, aiming to utilize potential chemical activity of industrial by-products in cement-clay cementitious system. The unconfined compressive strength (UCS) tests, consolidated undrained triaxial compression tests, hydraulic conductivity tests and microscopic tests were conducted to examine the evolution of mechanical behavior of stabilized clay with RM/PG proportions. The microscopic coupled effects in stabilized clay were clarified. The results show that addition of RM and PG improves the mechanical behavior of stabilized clay significantly, and the synergistic effects between RM and PG are remarkable. An optimal proportion of R7.5P2.5 can increase the UCS of stabilized clay by 0.8~1 times. The alkali-activation effects of RM contributes to the dissolution of clay mineral and the promotes pozzolanic reactions, resulting in stronger cementation effects of soil particles and larger cohesion. The PG contributes to the generation of ettringite and fills pores, resulting in a larger frictional angle. In addition, the failure strain of stabilized clay increases significantly with addition of PG, indicating a stronger capacity in plastic deformation. The coupled alkali-activation effects, pore-filling effects and cementation damage effects exist in RM-PG-cement stabilized clay. The evolution of mechanical behavior is consistent with microscopic coupled effects.
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