| 姚韦靖,韩金秀,蔡海兵,彭泉森.不同盐浓度冻融循环后玻化微珠保温混凝土性能劣化[J].安徽建筑大学学报,2025,33(1):10-19 |
| 不同盐浓度冻融循环后玻化微珠保温混凝土性能劣化 |
| Performance Deteriorates of Glazed Hollow Bead Insulation Normal Concrete after Freeze-thaw Cycles with DifferentSalt Concentrations |
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| DOI： |
| 中文关键词: 玻化微珠保温混凝土 盐冻循环 超声波无损检测 性能劣化 拟合 微观分析 |
| 英文关键词: glazed hollow bead insulation normal concrete salt freeze-thaw cycle ultrasonic nondestructive testing performance dete⁃rioration fitting micro-structure analysis |
| 基金项目:安徽省住房城乡建设科学技术计划项目（2023-YF048）；安徽省博士后科研项目（2024C943）；安徽理工大学研究生创新基金项目（2023CX2041）；淮南市科技计划项目（2023A313） |
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| 中文摘要: |
| 制备玻化微珠保温混凝土（GHB/NC），研究在不同浓度NaCl溶液中经历0至60次冻融循环后性能劣化情况。测试混凝土表观现象、剥落量及抗压强度，采用超声波无损检测法测试材料的相对波速和损伤度，采用扫描电镜测试材料微观结构变化。结果表明：随盐浓度增加，GHB/NC各项性能急剧下降，存在性能劣化最明显盐浓度为3%和6%；随冻融循环次数增加，GHB/NC表面发生剥离、坑蚀增多，盐冻循环剥落量增大，强度损失逐渐加剧，超声参数与抗压强度损失率之间呈现出良好的相关性，拟合结果较好；经历了 60次冻融循环后，材料内部损伤逐渐恶化，微小裂缝逐渐扩大、相互贯通形成通道，导致整体力学性能下降，在0%、3%、6%、9%、12%NaCl溶液中，GHB/NC的抗压强度损失率分别为20.69%、51.67%、51.94%、42.22%、46.11%。 |
| 英文摘要: |
| The glazed hollow bead insulation normal concrete（GHB/NC）was prepared to study the performance degradation after 0 to60 freeze-thaw cycles in different concentrations of NaCl solution. The apparent phenomenon, spalling amount and compressivestrength of concrete were tested. The relative wave velocity and damage degree of materials were tested by ultrasonic nondestructivetesting method, and the microstructure changes of materials by scanning electron microscopy. The results showed that the properties ofGHB / NC decreased sharply with the increase of salt concentration, and the most obvious salt concentration was 3 % and 6 %. Withthe increase of the freeze-thaw cycles, the peeling and pitting corrosion increased on the surface of GHB / NC, and the strength lossincreased with the peeling amount of salt freezing cycle. There was a good correlation between the ultrasonic parameters and the lossrate of compressive strength, and the fitting results were good. After 60 freeze-thaw cycles, the internal damage of the material deteriorated,as the micro-cracks expanded and interconnected to form channels, resulting in a decrease in the overall mechanical properties. In 0%,3%, 6%, 9%, and 12% NaCl solutions, the compressive strength loss rates of GHB/NC were 20.69%, 51.67%, 51.94%, 42.22%, and46.11%, respectively. |
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