田辉,贾宇,汤雷,王玉磊,张盛行,李坡

• 1:南京水利科学研究院水灾害防御全国重点实验室
• 2:南京水利科学研究院
• 3:天津大学建筑工程学院

摘要(Abstract)：

裂缝深度检测是行业难题，传统的超声波检测法存在测量误差大、操作复杂等问题。为精确高效探测混凝土裂缝深度，以5 nm磁性Fe_3O_4为分散质，合理分散在纳米改性硅酸盐水溶液中，形成了一种纳米磁性液态指示剂，提出了向裂缝腔体中灌注纳米磁性指示剂并结合手持雷达扫描的可视化探测裂缝深度的方法。同时构建了混凝土裂缝深度物理模型，比较了有无纳米磁性指示剂的手持雷达检测剖面图并定量评价了检测误差。结果表明：纳米磁性指示剂具有较高的介电性，介电常数为278.3、反射系数为73.49%;纳米磁性指示剂，实现了对宽度为0.057 mm的垂直裂缝深度可视化检测，检测精度在95%以上。

关键词(KeyWords)： 指示剂;裂缝深度;混凝土;手持雷达;可视化

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金(52109162);; 国家重点研发计划(2021YFC3090104);; 江苏省自然科学基金(BK20221192);; 中央级公益性科研院所基本科研业务费专项资金(Y423003);; 南京水利科学研究院研究生学位论文创新基金(Yy424001)

作者(Author): 田辉,贾宇,汤雷,王玉磊,张盛行,李坡

DOI: 10.13928/j.cnki.wrahe.2024.S2.094

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