关键词: 混凝土, 冲磨性能, 冻融作用, 损伤层厚度, 维氏硬度, 低热水泥

Abstract: Freeze-thaw damage and abrasive wear are common types of deterioration in hydraulic concrete in cold regions. To scientifically evaluate the abrasive performance of low heat cement concrete under freezing and thawing, abrasive tests were conducted on low heat cement concrete samples using underwater steel ball method under different degrees of freeze-thaw damage achieved through rapid freezing. The interactive relationships between Vickers hardness, damage layer thickness, abrasive depth, abrasive morphology, and fractal dimension with respect to abrasion age were investigated. Results indicate that freeze-thaw damage in concrete is a continuous and non-synchronous process influenced by surface-to-interior deterioration and overall degradation. Abrasion is a physical destruction occurring layer by layer from the surface to the interior. With an increasing number of freeze-thaw cycles, the overall Vickers hardness of the concrete decreases, and the damage layer thickness increases. Additionally, at the same abrasion age, the abrasive depth and surface fractal dimension increase. Within a 72-hour abrasive cycle, the average abrasive depth for concrete subjected to 50, 100, and 200 freeze-thaw cycles is less than the corresponding damage layer thickness. The obtained evolution patterns of concrete properties under the combined effect of freeze-thaw and abrasion provide references for the evaluation of multifactor-induced damage in concrete materials.

Key words: concrete, abrasive performance, freeze-thaw, damaged layer thickness, Vickers hardness, low heat cement