Mechanical behavior of clay soil stabilizedwith glass residue powdered in high-energy and ball mills

ABSTRACT The capital of the Amazonas State presents difficulties in the construction of pavements due to the superficial predominance of clay in its geotechnical profile. This material is unsuitable for the construction of sublayers of these urban structures. In the present study, the mechanical behavior of the Manaus-AM typical clay soil was evaluated in its natural condition and when mixed with 5% of powdered glass waste processed in two types of mills (balls and high energy) in order to improve their geotechnical properties. The natural material and its compositions was characterized in relation to their physical properties (liquidity limit, plasticity limit, grain size and compaction) and mineralogical properties, as well as the natural soil mineralogy. According to the direct shear test and the Coulomb rupture criterion, the cohesion and the internal friction angle of the clay soil were determined, as well of the soil compositions with 5% of powdered glass processed in ball mill and 5% of powdered glass processed in high-energy mill. The results showed that there was a significant improvement in the regional soil properties when glass residue is added, both physically and mechanically, with emphasis on the participation of the powdered material processed in the high-energy mill. Therefore, the powdered glass has the potential to be used as granulometric stabilizer in roadways construction, which is an environmental alternative for the disposal of such materials.

摘要：亚马孙州首府区域的岩土剖面表层以黏土为主，导致路面施工面临诸多阻碍。该类黏土不适用于该城市基础设施基层的修筑。本研究针对马瑙斯-AM典型天然黏土，以及掺入5%经两种磨机（球磨机与高能磨机）加工的玻璃粉的改性土样，开展力学性能评估，以改善其岩土工程特性。

研究团队对天然黏土及各改性试样开展了物理特性（液限、塑限、颗粒级配与击实特性）、矿物学特性表征，并分析了天然土体的矿物组成。通过直剪试验与库仑破坏准则，分别测定了天然黏土、掺入5%球磨玻璃粉试样及5%高能磨玻璃粉试样的黏聚力与内摩擦角。

结果表明，掺入玻璃废渣可显著改善区域黏土的物理与力学性能，其中经高能磨机加工的玻璃粉改性效果尤为突出。综上，玻璃粉可作为道路施工中的颗粒级配稳定剂，为该类废弃物的环境友好型处置提供了可行替代方案。