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    Volume 46, Issue 4 (July 2018)

    Special Issue Paper

    Experimental Study on Lime and Fly Ash–Stabilized Sintered Red Mud in Road Base

    (Received 6 April 2017; accepted 14 July 2017)

    Published Online: 2018

    CODEN: JTEVAB

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    Abstract

    Sintered red mud is one of the solid wastes in the production of alumina. To utilize the red mud efficiently and reduce the pollution to the environment, an experimental study was carried out to verify its application in road base. The compaction tests and unconfined compression strength tests were conducted to determine the optimum mixture ratio, which is 70 % red mud, 7.5 % lime, and 22.5 % fly ash. The scanning electron microscopy test was conducted to reveal the strength development mechanism of the specimens lime and fly ash–stabilized red mud. After that, performance tests for the lime and fly ash–stabilized red mud were carried out. The results of freezing and thawing test, dry shrinkage test, temperature shrinkage test, and erosion resistance test show that the stability of the lime and fly ash–stabilized red mud is good. The fatigue test shows that the fatigue performance of lime and fly ash–stabilized red mud is similar to that of lime and fly ash–stabilized fine-grained soil. Finally, mechanical tests were carried out. Compared with some other commonly used road base materials, the compression rebound modulus of lime and fly ash–stabilized red mud is greater, while its indirect tensile strength is similar to that of other materials. The fly ash–stabilized sintered red mud can be used in road base.

    Author Information:

    Zhang, Jiaming
    Department of Highway and Railway Engineering, School of Transportation, Southeast University, Nanjing, Jiangsu

    Li, Chang
    Department of Highway and Railway Engineering, School of Transportation, Southeast University, Nanjing, Jiangsu


    Stock #: JTE20170215

    ISSN:0090-3973

    DOI: 10.1520/JTE20170215

    Author
    Title Experimental Study on Lime and Fly Ash–Stabilized Sintered Red Mud in Road Base
    Symposium ,
    Committee C09