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Mechanical and microstructural properties of dredged sediments treated with cement and fly ash for use as road materials
Road Materials and Pavement Design ( IF 3.7 ) Pub Date : 2020-05-29 , DOI: 10.1080/14680629.2020.1772349
Pitthaya Jamsawang 1 , Sunthiti Charoensil 1 , Tanapat Namjan 1 , Pornkasem Jongpradist 2 , Suched Likitlersuang 3
Affiliation  

Dredged sediments excavated or removed from reservoirs are classified as waste materials. The reuse of dredged sediments as road materials is an interesting solution to environmental problems. However, only the compaction technique without treatment by admixtures is insufficient to improve the strength and stiffness of the dredged sediments for use as standard road materials. This research presents the mechanical and microstructural properties of dredged sediments treated with ordinary Portland cement (OPC) and fly ash (FA). A large amount of FA was utilised for the purpose of cost-effectiveness. The dredged sediments were mixed with 1.5%–5% OPC and 5%–20% using exclusively OPC, exclusively FA and a combination of OPC and FA. The experiments in this study consisted of unconfined compressive strength, splitting tensile strength, California bearing ratio, resilient modulus, and ultrasonic pulse velocity tests. The results showed that the mechanical properties were improved by the addition of FA and that the maximum values of these properties were observed with a combination of 5% OPC and 10% FA. In addition to evaluating the mechanical properties, microscale analyses were also conducted using scanning electron microscopy and energy-dispersive X-ray spectroscopy to understand the behaviour of the dredged sediment with respect to the OPC and FA contents. Finally, stabilised sediments were assessed for possible reuse as road materials based on the Department of Highways of Thailand standard as well as the recommendations of the AASHTO Mechanistic-Empirical Pavement Design Guide and Austroads (2017)



中文翻译:

用水泥和粉煤灰处理用作道路材料的疏浚沉积物的机械和微观结构特性

从水库挖掘或清除的疏浚沉积物被归类为废料。重新利用疏浚沉积物作为道路材料是解决环境问题的一个有趣的方法。然而,仅采用未经外加剂处理的压实技术不足以提高用作标准道路材料的疏浚沉积物的强度和刚度。本研究介绍了用普通波特兰水泥 (OPC) 和粉煤灰 (FA) 处理的疏浚沉积物的机械和微观结构特性。出于成本效益的目的,大量使用了 FA。疏浚的沉积物与 1.5%–5% 的 OPC 和 5%–20% 的 OPC 混合,完全使用 FA 以及 OPC 和 FA 的组合。本研究中的试验包括无侧限抗压强度、劈裂抗拉强度、加利福尼亚轴承比、弹性模量和超声波脉冲速度测试。结果表明,加入 FA 可改善机械性能,并且在 5% OPC 和 10% FA 的组合下观察到这些性能的最大值。除了评估机械性能外,还使用扫描电子显微镜和能量色散 X 射线光谱仪进行了微观分析,以了解疏浚沉积物相对于 OPC 和 FA 含量的行为。最后,根据泰国公路部标准以及 AASHTO 机械经验路面设计指南和 Austroads (2017) 的建议,评估了稳定沉积物是否可能作为道路材料再利用 结果表明,加入 FA 可改善机械性能,并且在 5% OPC 和 10% FA 的组合下观察到这些性能的最大值。除了评估机械性能外,还使用扫描电子显微镜和能量色散 X 射线光谱仪进行了微观分析,以了解疏浚沉积物相对于 OPC 和 FA 含量的行为。最后,根据泰国公路部标准以及 AASHTO 机械经验路面设计指南和 Austroads (2017) 的建议,评估了稳定沉积物是否可能作为道路材料再利用 结果表明,加入 FA 可改善机械性能,并且在 5% OPC 和 10% FA 的组合下观察到这些性能的最大值。除了评估机械性能外,还使用扫描电子显微镜和能量色散 X 射线光谱仪进行了微观分析,以了解疏浚沉积物相对于 OPC 和 FA 含量的行为。最后,根据泰国公路部标准以及 AASHTO 机械经验路面设计指南和 Austroads (2017) 的建议,评估了稳定沉积物是否可能作为道路材料再利用

更新日期:2020-05-29
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