Abstract

In this study, the effects of quick lime (QL), calcite, and sodium lignosulfonate (SL) powders combined with liquid on granular system were compared. Different loading stresses were used to compare their shear and tensile characteristics. Glass beads (400–600 µm in size) and varying powder-to-liquid contents (from 0% to 5% in mass) as the binder in mixture were used to investigate their shear behavior and bulk density. Results showed that the shear strength was improved for all tested powder binders with their increased content in mixture. QL and calcite powders were weak when the liquid content was large (4–5%). Meanwhile, SL powder sufficiently controlled liquid and improved cohesion-related forces required to form and maintain granular bed stability. It also exhibited higher tensile strength than the other powders. Similar to SL powder, QL powder maintained significant tensile strength. The cohesion was enhanced and varied in the range of 0.17–1.46 kPa for QL powder and 0.10–1.08 kPa for calcite powder. By contrast, SL powder resulted in a high cohesion of 0.39–1.59 kPa for overall contents. The measured bulk density decreased to a certain extent and then increased for all powder binders with liquid content.

摘要

本研究比较了生石灰 (QL)、方解石和木质素磺酸钠 (SL) 粉末与液体结合对颗粒体系的影响。使用不同的加载应力来比较它们的剪切和拉伸特性。玻璃珠（400–600 µm 尺寸）和不同的粉末到液体含量（质量从 0% 到 5%）作为混合物中的粘合剂用于研究它们的剪切行为和堆积密度。结果表明，随着混合物中含量的增加，所有测试的粉末粘合剂的剪切强度都有所提高。当液体含量较大（4-5%）时，QL 和方解石粉末较弱。同时，SL 粉末充分控制了液体并改善了形成和保持颗粒床稳定性所需的内聚力。它还表现出比其他粉末更高的拉伸强度。与SL粉类似，QL 粉末保持显着的拉伸强度。QL 粉末的内聚力增强并在 0.17-1.46 kPa 和方解石粉末的 0.10-1.08 kPa 范围内变化。相比之下，SL 粉末的整体含量具有 0.39–1.59 kPa 的高内聚力。对于所有具有液体含量的粉末粘合剂，测得的堆积密度在一定程度上下降然后增加。