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  • Open AccessOpen Access

    ARTICLE

    Numerical Approach to Simulate the Effect of Corrosion Damage on the Natural Frequency of Reinforced Concrete Structures

    Amthal Hakim1, Wael Slika1,*, Rawan Machmouchi1, Adel Elkordi2
    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 175-194, 2023, DOI:10.32604/sdhm.2022.023027
    Abstract Corrosion of reinforcing steel in concrete elements causes minor to major damage in different aspects. It may lead to spalling of concrete cover, reduction of section’s capacity and can alter the dynamic properties. For the dynamic properties, natural frequency is to be a reliable indicator of structural integrity that can be utilized in non-destructive corrosion assessment. Although the correlation between natural frequency and corrosion damage has been reflected in different experimental programs, few attempts have been made to investigate this relationship in forward modeling and/or structural health monitoring techniques. This can be attributed to the… More >

  • Open AccessOpen Access

    ARTICLE

    Determination of Reflected Temperature in Active Thermography Measurements for Corrosion Quantification of Reinforced Concrete Elements

    Suyadi Kartorono*, Herlien Dwiarti Setio, Adang Surahman, Ediansjah Zulkifli
    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 195-208, 2023, DOI:10.32604/sdhm.2022.023259
    Abstract This paper sums up the determining analysis of the measuring location of Trefl using a thermocouple during the thermography tests. Laboratory temperature distribution testing methods, analysis of value and location of Trefl measurement are explained in this paper. The heat source is two halogen lamps of 500 watts each fitted at a distance of 30–50 cm. Noises appearing during testing of thermography are corrected with measured Trefl value. The results of thermogram correction of corroded concrete surfaces using Trefl values are displayed in this paper too. The concrete surface temperature results of quantitative image processing method are More >

  • Open AccessOpen Access

    ARTICLE

    Numerical Study on Mechanism of Blast-Induced Damage Considering Guiding Effect of Water Jet Slot

    Dengfeng Su1, Zizheng Jia1,*, Qiang Zhu1, Zhengguo Li1, Banghong Chen1, Dandan Zheng2
    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 209-224, 2023, DOI:10.32604/sdhm.2022.021257
    Abstract Damage is one of the most important characteristics of rock failure. Studying the damage mechanism of rock blasting under the guiding effect of the water jet slot and revealing the mechanism of controlled blasting with water jet assistance are crucial. In this study, a rock-like material was chosen as the research object for the calibration experiment of the numerical model. The numerical simulation models were then established by ANSYS/LS-DYNA, and the blast-induced damage mechanism under the guiding effect of the water jet slot was analyzed according to the blasting theory. The results indicated that explosive… More >

    Graphic Abstract

    Numerical Study on Mechanism of Blast-Induced Damage Considering Guiding Effect of Water Jet Slot

  • Open AccessOpen Access

    ARTICLE

    Effect of Freeze-Thaw Cycles on Chloride Transportation in Concrete: Prediction Model and Experiment

    Yongdong Yan*, Youdong Si, Chunhua Lu, Keke Wu
    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 225-238, 2023, DOI:10.32604/sdhm.2022.022629
    Abstract This research aims to investigate the effect of frost damage on chloride transportation mechanism in ordinary and fiber concrete with both theoretical and experimental methods. The proposed theoretical model takes into account the varying damage levels caused by concrete cover depth and freeze-thaw cycles, which are the two primary parameters affecting the expression of the chloride diffusion coefficient. In the experiment, three types of concrete were prepared: ordinary Portland concrete (OPC), polypropylene fiber concrete (PFC), and steel fiber concrete (SFC). These were then immersed in NaCl solution for 120 days after undergoing 10, 25, and… More >

  • Open AccessOpen Access

    REVIEW

    Research Progress on the Influence of Varying Fiber Contents on Mechanical Properties of Recycled Concrete

    Zhenqing Shi1, Guomin Sun1, Jianyong Pang2,*
    Structural Durability & Health Monitoring, Vol.17, No.3, pp. 239-255, 2023, DOI:10.32604/sdhm.2023.022816
    Abstract Applying recycled concrete for engineered projects not only protects the ecological environment but also improves the utilization rate of waste concrete to satisfy sustainable development requirements. However, the mechanical properties of recycled concrete are not as good as those of ordinary concrete. To enhance the former’s performance and increase its popularity and application in engineering fields, notable advances have been made by using steel, synthetic, plant, and mineral fiber materials. These materials are added to recycled concrete to improve its mechanical properties. Studies have shown that (1) steel fibers have a distinct reinforcing effect and… More >

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