[1] WANG Zhangxiang, CHEN Xudong, LENG Yong, ZHANG Guozhi, et al. Mechanical properties and damage evolution of sprayed ultrahigh performance concrete under uniaxial compression [J]. Journal of Southeast University (English Edition), 2025, 41 (2): 171-179. [doi:10.3969/j.issn.1003-7985.2025.02.006]
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Mechanical properties and damage evolution of sprayed ultrahigh performance concrete under uniaxial compression(
)
喷射超高性能混凝土轴压力学特性与损伤演变规律
)Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]
- Volumn:
- 41
- Issue:
- 2025 2
- Page:
- 171-179
- Research Field:
- Materials Sciences and Engineering
- Publishing date:
- 2025-06-17
Info
- Title:
- Mechanical properties and damage evolution of sprayed ultrahigh performance concrete under uniaxial compression
- 喷射超高性能混凝土轴压力学特性与损伤演变规律
- Author(s):
- WANG Zhangxiang1, CHEN Xudong1, LENG Yong2, ZHANG Guozhi2, CHEN Feixiang2, YAO Tianyu1
- 1.College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China
2.CCCC Second Harbor Engineering Co., Ltd., Wuhan 430040, China
- Keywords:
- sprayed ultrahigh performance concrete; acoustic emission; digital image correlation; uniaxial compression; crack propagation; damage evolution
- PACS:
- TU528
- DOI:
- 10.3969/j.issn.1003-7985.2025.02.006
- Abstract:
- To investigate the effects of the spraying process and different fibers on the mechanical properties and failure patterns of ultrahigh performance concrete (UHPC), three types of fibers were used. These fibers were formed using both spraying and molding methods. Uniaxial compression tests were conducted, and two nondestructive monitoring techniques, acoustic emission (AE) and digital image correlation, were employed to monitor the uniaxial compression tests. The results indicated that the compressive strength of UHPC with single steel fibers and hybrid fibers increased by about 19% and 14% compared with those of UHPC with polyoxymethylene fibers. In comparison with molded UHPC, sprayed UHPC showed a slight improvement in compressive strength. Specimens containing steel fibers exhibited better post-cracking ductility, whereas those with only polyoxymethylene fibers displayed a certain degree of brittle failure. In sprayed UHPC, the onset of significant internal damage was delayed, which was related to the redistribution of internal fibers. The failure of UHPC was characterized by primary tensile cracks, supplemented by shear cracks. The spraying process can better restrict the development of tensile cracks in UHPC. Sprayed UHPC typically exhibited multiple crack developments leading to failure, whereas molded UHPC generally failed in the form of a single main crack penetrating the specimen. The addition of steel fibers delayed the occurrence of local stress concentration zones, aligning well with AE monitoring data.
- 为研究喷射工艺及不同纤维对超高性能混凝土（UHPC）力学特性和破坏形态的影响，选取钢纤维、聚甲醛纤维和钢-聚甲醛混杂纤维3种纤维类型，分别采用喷射和模筑2种方式成型，进行单轴压缩试验，并利用声发射（AE）和数字图像相关（DIC）两种无损监测技术对单轴压缩试验进行监测。结果表明，掺入单一钢纤维和混杂纤维的UHPC抗压强度分别比聚甲醛纤维UHPC提高约19%和14%。与模筑UHPC相比，喷射UHPC的抗压强度略微提升。含钢纤维的试件破坏时延性较好，仅含聚甲醛纤维的试件呈现出脆性破坏，喷射UHPC内部首次出现较大损伤的情况存在一定的延时，这与其内部纤维重分布有关。UHPC的轴压破坏以拉伸裂缝为主，剪切裂缝为辅，喷射工艺可以较好地限制其拉伸裂缝的发展。喷射UHPC通常展现出多条裂缝发展破坏，模筑UHPC的破坏形式则多为单一主裂缝贯穿试件，钢纤维的加入延后了局部应力集中带的出现，这与声发射监测数据基本吻合。
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Memo
- Memo:
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Received 2024-07-29,Revised 2024-09-30.
Biographies:Wang Zhangxiang(2002—),male,Ph. D. candidate;Chen Xudong(corresponding author),male,doctor,professor,cxdong1985@163.com.
Foundation items:The National Natural Science Foundation of China(No. 52379124),the National Key Research and Development Program of China(No. 2021YFB2600200).
Citation:WANG Zhangxiang,CHEN Xudong,LENG Yong,et al.Mechanical properties and damage evolution of sprayed ultrahigh performance concrete under uniaxial compression[J].Journal of Southeast University (English Edition),2025,41(2):171-179.DOI:10.3969/j.issn.1003-7985.2025.02.006.DOI:10.3969/j.issn.1003-7985.2025.02.006