Performance degradation and microscopic structure of glazed hollow bead insulation normal concrete after exposure to high temperature
-
摘要: 配制普通混凝土（NC）和玻化微珠保温混凝土（GHB/NC），研究从常温升温至1 000℃高温后表观现象变化、质量、抗压强度损失等性能的劣化过程，同时讨论超声波无损检测法评判混凝土高温后性能的普适性，对比分析相对波速、损伤度与受热温度、抗压强度损失率的关系，利用SEM观察不同高温后试件微观结构变化。结果表明：采用相对波速、损伤度评价混凝土高温后性能具有良好相关性，回归公式拟合度较高；随温度升高，NC和GHB/NC混凝土内部损伤逐步加剧，水泥胶凝受热分解、水分散失等在试件表面和内部产生空隙、裂纹并相互贯通，玻化微珠、粗骨料与水泥石界面黏结力逐步减弱甚至丧失，造成宏观力学性能劣化，抗压强度损失率增大。升温至800℃后NC强度损失72.3%，GHB/NC强度损失74.6%，1 000℃时基本丧失承载能力。Abstract: The normal concrete (NC) and glazed hollow bead insulation normal concrete (GHB/NC) were made for studying the process of performance degradation from normal temperature to 1 000℃, which including changes in apparent phenomena, loss of mass and compressive strength. Simultaneously, the adaptation of ultrasonic test in evaluating the performance of concrete after exposure to high temperature was investigated. The relationships between relative velocity, damage degree and temperature, compressive strength loss rate were comparative analyzed. The micro-structure changes of concrete specimens after exposure to different high temperatures were observed by SEM. The results show that it has good correlation of the parameters of relative velocity and damage degree in evaluating the performance of concrete after high temperature. The regression formula has a good fitting degree. With the rise of heat temperature, the internal damage of concrete is gradually intensified, cement hydrates decomposes and water disperses, which causes voids, cracks and interpenetration occurred on the surface and inside of the specimens. The bonding force between glazed hollow bead, coarse aggregates and cement paste is gradually weakened or even lost. These cause deterioration of macroscopic mechanical properties and increasing of compressive strength loss rate of GHB/NC and NC. After experiencing the high temperature of 800℃, the losses in compressive strength of NC and GHB/NC are 72.3% and 74.6%, and the bearing capacity is almost lost after exposure to 1 000℃.
-
-
期刊类型引用(16)
1. 石建军，汪佳乐，李景阳，许新春，刘正宇，张兰硕，唐刘毅. 掺蛇纹石粉末的N-羟甲基丙烯酰胺复合外加剂对混凝土性能的影响. 混凝土与水泥制品. 2025(01): 25-28+33 . 
百度学术
2. 田威，郭健，王文奎，张景生，王凯星. 高温后混凝土毛细吸水特性的核磁共振分析及其力学性能研究. 材料导报. 2025(03): 85-91 . 百度学术
3. 姚韦靖，韩金秀，方冉，庞建勇. 秸秆/聚丙烯纤维-玻化微珠保温混凝土基本性能正交试验. 长江科学院院报. 2024(06): 156-163 . 百度学术
4. 徐佳慧，杨予，刘恒，周强兵. 泊松比变化对基于波速混凝土损伤计算的影响. 计量学报. 2024(06): 881-889 . 百度学术
5. 朱立晨，陶仁光，刘海峰，杨维武，王修文. 沙漠砂混凝土高温后性能劣化及微观结构分析. 混凝土. 2024(08): 106-111 . 百度学术
6. 刘海峰，徐文婧，刘一江，徐婷，杨维武，邵蔚. 高温后沙漠砂混凝土抗压强度恢复试验研究. 混凝土. 2023(01): 154-158 . 百度学术
7. 王恒，徐义华，姚韦靖，庞建勇，刘雨姗. 稻壳灰橡胶混凝土抗冻融性能及微观结构. 复合材料学报. 2023(05): 2951-2959 . 本站查看
8. 刘光程，姚韦靖，庞建勇. 秸秆/聚丙烯纤维-玻化微珠保温混凝土抗冻融试验研究. 安徽理工大学学报(自然科学版). 2023(04): 34-40 . 百度学术
9. 申海洋，刘凌晖，任磊. 高温作用下轻骨料混凝土力学性能研究. 铁道科学与工程学报. 2022(10): 2976-2983 . 百度学术
10. 毛振豪，张继承，李元齐，杜国锋，阳霞. 活性粉末混凝土高温后性能劣化及微观结构. 建筑材料学报. 2022(12): 1225-1232 . 百度学术
11. 管柏伦，郭荣鑫，齐荣庆，付朝书，张敏，张文帅. 偏高岭土-粉煤灰基地聚物砂浆力学性能研究. 硅酸盐通报. 2021(04): 1250-1257 . 百度学术
12. 刘雨姗，庞建勇，姚韦靖. 页岩陶粒轻骨料混凝土高温后蠕变特性. 建筑材料学报. 2021(05): 1096-1104 . 百度学术
13. 姚韦靖，刘雨姗，王婷雅，庞建勇. 橡胶/混凝土盐冻循环后性能劣化及微观结构. 复合材料学报. 2021(12): 4294-4304 . 本站查看
14. 杜红秀，樊亚男. 基于X-CT的C60高性能混凝土高温细观结构损伤研究. 建筑材料学报. 2020(01): 210-215 . 百度学术
15. 王志丹，王团结. 碳纤维混凝土的耐火性能试验测试与分析. 中国安全生产科学技术. 2020(11): 77-81 . 百度学术
16. 郑慧君. 石墨质改性混凝土高温性能的研究. 硅酸盐通报. 2020(12): 3851-3857 . 百度学术
其他类型引用(16)
-
计量
- 文章访问数: 581
- HTML全文浏览量: 77
- PDF下载量: 148
- 被引次数: 32
下载:
