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  • Open Access


    A Study of the Structural Evolution and Strength Damage Mechanisms of Pisha-Sandstone Cement Soil Modified with Fly Ash

    Jian Yang, Xiaoli Li*, Hui Wang, Kaiqiang Geng

    Journal of Renewable Materials, Vol.9, No.12, pp. 2241-2260, 2021, DOI:10.32604/jrm.2021.015565

    Abstract In the present study, in order to investigate the effects of fly ash on the structural evolution and strength damage mechanism of Pisha-sandstone cement soil, unconfined compressive strength tests of Pisha-sandstone cement soil with different fly ash content levels and various ages were carried out. The apparent morphology, microstructures, and chemical compositions of the samples were observed and analyzed using ultra-depth three-dimensional microscopy, scanning electron microscopy, and XRD methods. The results revealed that the unconfined compressive strength levels of Pisha-sandstone cement soil samples displayed increasing trends with the increases in fly ash content and age. For example, when the fly… More > Graphic Abstract

    A Study of the Structural Evolution and Strength Damage Mechanisms of Pisha-Sandstone Cement Soil Modified with Fly Ash

  • Open Access


    Study on Carbonation Damage Constitutive Curve and Microscopic Damage Mechanism of Tailing Recycled Concrete

    Tao Li1,2,*, Sheliang Wang2, Fan Xu2,*, Binbin Li3, Bin Dang1, Meng Zhan4, Zhiqi Wang5

    Journal of Renewable Materials, Vol.9, No.8, pp. 1413-1432, 2021, DOI:10.32604/jrm.2021.012744

    Abstract To improve the resource utilization of recycled aggregate concrete (RAC) and make use of the unique pozzolanic activation characteristics of iron ore tailing (IOT), the constitutive curves of tailing recycled concrete (TRC) before and after carbonization were analyzed theoretically, experimentally and microscopically. Firstly, according to the experimental data, the damage constitutive and related damage parameters of TRC were theoretically established by Weibull probability distribution function. Secondly, the comprehensive damage parameter b under different working conditions was studied. Finally, the damage mechanism was formed by EDS and SEM. The results showed that the damage constitutive model based on Weibull probability distribution… More >

  • Open Access


    Structural Integrity and Durability of High Voltage Composite (Non-Ceramic) Insulators

    M. Kumosa1

    Structural Durability & Health Monitoring, Vol.3, No.1, pp. 35-50, 2007, DOI:10.3970/sdhm.2007.003.035

    Abstract This paper deals with the structural integrity and durability of suspension composite (non-ceramic, polymer) insulators widely used in power transmission systems around the world. Under certain conditions, the insulators can fail in-service both electrically and mechanically resulting in the drop of energized transmission lines and power outages. In this work, predominantly mechanical failures of the insulators are discussed. In particular, the most important characteristics of a catastrophic failure process called brittle fracture are described. Subsequently, two examples of insulator failures by brittle fracture are shown and their causes explained. Finally, several recommendations on how to avoid brittle fracture as well… More >

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