冻融损伤与冲磨破坏是寒冷地区水工混凝土的常见病害类型,为了科学评价冻融混凝土的磨蚀性能,以低热水泥混凝土为研究对象,采用快冻法将其冻至不同损伤程度后进行水下钢球法冲磨试验,研究了维氏硬度、损伤层厚度、磨蚀深度、磨蚀形貌和分形维数随冲磨时间的交互变化关系。结果表明:混凝土冻融破坏是一个由表及里损伤与整体劣化共同作用的连续且不同步过程,磨蚀是由过流面向其内部逐层发生的物理性破坏;随着冻融次数的增加,混凝土整体维氏硬度下降、损伤层厚度增加,相同冲磨时间下的磨蚀深度和表面分形维数增大;72 h冲磨周期内,经50、100和200次冻融循环的混凝土平均磨蚀深度均小于其损伤层厚度。研究所得冻融和冲磨共同作用下混凝土性能演化规律可为多因素作用下混凝土材料的损伤评价提供参考。
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.
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
Key words
concrete /
abrasive performance /
freeze-thaw /
damaged layer thickness /
Vickers hardness /
low heat cement
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基金
新疆农业大学高层次人才科研培育计划项目(2522GCCRC);国家自然科学基金项目(52269028)
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