Study of natural self-healing of hydraulic concrete damaged by up to 200 freeze-thaw cycles

Study of natural self-healing of hydraulic concrete damaged by up to 200 freeze-thaw cycles

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To investigate the recovery effect of natural self-healing of freeze-thaw damage of cementitious material-poor hydraulic concrete, we carried out a natural self-healing test for hydraulic concrete damaged by up to 200 rapid freeze-thaw cycles.The self-healing effect of macro-mechanical properties of hydraulic concrete damaged by freeze-thaw cycles was quantitatively characterized by the recovery rate of the specimens which underwent different numbers of freeze-thaw cycles then continued the standard curing to 28 days.Next, the microscopic properties 3282779348850 of damaged hydraulic concrete after self-healing were further investigated by combining XRD, SEM and nitrogen adsorption tests.Finally, a prediction model of the recovery rate of macro-mechanical properties was established by using the microscopic pore test results.The results showed wetseat car seat covers that, when the hydraulic concrete undergoes the damage of different freeze-thaw cycles and continues to standard curing for 28 days, the concrete specimens manifest natural self-healing to some extent even if damaged by up to 200 freeze-thaw cycles.