基于声发射-数字图像相关技术的泡沫混凝土冻融破坏特征及损伤演化规律

牛瀚仪; 陈波; 袁志颖

基于声发射-数字图像相关技术的泡沫混凝土冻融破坏特征及损伤演化规律

牛瀚仪^{1, 2, 3},
陈波^{1, 2, ,},
袁志颖⁴

1.
河海大学　水利水电学院, 南京 210098
2.
河海大学　水灾害防御全国重点实验室, 南京 210098
3.
南京水利科学研究院, 南京 210029
4.
中国电建集团中南勘测设计研究院有限公司, 长沙 410014

基金项目: 国家自然科学基金项目(52079049; 52239009)；国家重点实验室基本科研业务费(522012272)

详细信息

通讯作者:
陈波，博士，教授，博士生导师，研究方向为水工混凝土新材料　E-mail: chenbo@hhu.edu.cn

中图分类号: (TU528)
计量
- 文章访问数: 54
- HTML全文浏览量: 35
- 被引次数: 0
出版历程
- 收稿日期: 2024-05-21
- 修回日期: 2024-06-20
- 录用日期: 2024-07-09
- 网络出版日期: 2024-07-24

Freeze-thaw damage characteristics and evolution law of foam concrete based on acoustic emission-digital image correlation technique

NIU Hanyi^{1, 2, 3},
CHEN Bo^{1, 2
, ,},
YUAN Zhiying⁴

1.
College of Water-conservancy and Hydropower, Hohai University, Nanjing 210098, China
2.
State Key Laboratory of Water Disaster Prevention, Hohai University, Nanjing 210098, China
3.
Nanjing Hydraulic Research Institute, Nanjing 210029, China
4.
Hydro China Zhongnan Engineering Corporation, Changsha 410014, China

Funds: General Program of National Natural Science Foundation of China (52079049; 52239009); Basic Scientific Research Business Expenses of National Key Laboratories (522012272)

摘要

摘要: 为研究冻融环境下泡沫混凝土压缩破坏特征及损伤演化规律，对密度为800 kg/m³的泡沫混凝土开展了单轴压缩-声发射(AE)-数字图像相关(DIC)技术联合测试试验，获取了泡沫混凝土加载过程中的应变演化云图以及声发射参数变化特征。结果表明：泡沫混凝土的压缩破坏过程曲线呈现明显的阶段效应，且试件经历的冻融循环次数越多，延性破坏特征越明显；随着冻融循环次数的增加，DIC监测到试件应变集中带面积逐渐递增，应变场均值逐渐下降，同时，试件表面裂缝的形态由最初的垂直型单一裂缝向倾斜的剪切型多裂缝演变；冻融为0、20、40、60和80次的泡沫混凝土试件最终破坏时剪切裂缝所占比例分别为52.5%、57.8%、59.2%、65.3%和69.2%，声发射b值下降阶段分别出现在加载进程的92.3%、89.1%、88.5%、76.5%和72.3%；冻融环境可以促进泡沫混凝土由拉伸破坏向剪切破坏的转变，加剧泡沫混凝土内部损伤，从而在材料内部诱发大尺度破裂现象； AE和DIC的结果相辅相成，它们的结合有助于全面了解泡沫混凝土中微裂缝的发展规律和损伤破坏机制。
- 冻融循环 /
- 声发射 /
- 数字图像相关技术 /
- 损伤演化 /
- 裂缝
Abstract: To study the compression damage characteristics and damage evolution law of foam concrete under a freeze-thaw environment, a joint test combining uniaxial compression, acoustic emission (AE), and digital image correlation (DIC) technology was carried out on foam concrete with a density of 800 kg/m³. The strain evolution cloud diagram and acoustic emission parameter change characteristics of the foam concrete during the loading process were obtained. The results show that the compression damage process curve of foam concrete presents an obvious staged effect. The more freeze-thaw cycles the specimen experiences, the more pronounced the ductile damage characteristics become. With the increase in the number of freeze-thaw cycles, the area of the strain concentration zone of the specimen monitored by the DIC gradually increases, while the average value of the strain field gradually decreases. Meanwhile, the morphology of surface cracks in the specimen evolves from initial vertical single cracks to tilted shear-type multi-fractures. The proportion of shear cracks in the final damage of foam concrete specimens with 0, 20, 40, 60, and 80 freeze-thaw cycles are 52.5%, 57.8%, 59.2%, 65.3%, and 69.2%, respectively. The stages of decreasing acoustic emission b-value appear in 92.3%, 89.1%, 88.5%, 76.5%, and 72.3% of the loading process, respectively. The freeze-thaw environment can promote the transition from tensile to shear damage in foam concrete, exacerbates the internal damage of foam concrete, and thus induces large-scale rupture phenomena within the material. The results of AE and DIC complement each other, and their combination contributes to a comprehensive understanding of the developmental pattern of microcracks and damage mechanisms in foam concrete.
- freeze-thaw cycle /
- acoustic emission /
- digital image correlation technique /
- damage evolution /
- cracking

HTML全文

图 1 试验方法与仪器

Figure 1. Test method and apparatus

下载: 全尺寸图片幻灯片

图 2 A08试件不同冻融循环次数下单轴压缩应力-应变曲线及破坏形态(A08代表密度为800 kg/m³泡沫混凝土试样)

Figure 2. Uniaxial compressive stress-strain curve and damage pattern of A08 specimen under different freeze-thaw cycle times (A08 refers to the specimen with the design dry density of 800 kg/m³)

下载: 全尺寸图片幻灯片

图 3 A08-0试件不同时刻表面应变演化云图

Figure 3. Cloud diagram of surface strain evolution at different moments of A08-0 specimen

下载: 全尺寸图片幻灯片

图 4 A08-20试件不同时刻表面应变演化云图

Figure 4. Cloud diagram of surface strain evolution at different moments of A08-20 specimen

A08-20 indicates the specimen with design dry density of 800 and the number of freeze-thaw cycles of 20. The rest of the specimen numbers are the same rules.

下载: 全尺寸图片幻灯片

图 5 A08-40试件不同时刻表面应变演化云图

Figure 5. Cloud diagram of surface strain evolution at different moments of A08-40 specimen

下载: 全尺寸图片幻灯片

图 6 A08-60试件不同时刻表面应变演化云图

Figure 6. Cloud diagram of surface strain evolution at different moments of A08-60 specimen

下载: 全尺寸图片幻灯片

图 7 A08-80试件不同时刻表面应变演化云图

Figure 7. Cloud diagram of surface strain evolution at different moments of A08-80 specimen

下载: 全尺寸图片幻灯片

图 8 A08等级不同冻融循环次数下的声发射振铃计数-荷载关系曲线

Figure 8. Acoustic emission ringing count-load relationship curves for different number of freeze-thaw cycles for A08 grade

下载: 全尺寸图片幻灯片

图 9 不同冻融循环次数下A08泡沫混凝土声发射RA-AF值

Figure 9. Acoustic emission RA-AF values of A08 foam concrete with different number of freeze-thaw cycles

下载: 全尺寸图片幻灯片

图 10 不同冻融循环次数下A08泡沫混凝土声发射b值

Figure 10. Acoustic emission b-value of A08 foam concrete with different number of freeze-thaw cycles

下载: 全尺寸图片幻灯片

表 1 不同冻融循环次数下A08试样平静段-陡增段分界点特征参数

Table 1. Characteristic parameters of the boundary between the quiet stage and the steep increase stage of A08 specimen under different freeze-thaw cycles

Freeze-thaw cycles	Breakpoint load/kN	Peak load /kN	Relative peak load
0	29.88	31.33	0.95
20	21.82	24.24	0.90
40	17.81	20.24	0.88
60	12.15	14.47	0.84
80	7.16	9.30	0.75
Note: Relative peak load = Breakpoint load/Peak load.

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