Investigation on Interfacial Behavior of Modified Basalt Textile Reinforced Concrete Using Acoustic Emission Technique

ABSTRACT

The tetrahedral structure of the basalt fabric is damaged when it is corroded by hydroxide ions, which greatly limits its application in the field of construction engineering as a result of the concrete matrix present in a strongly alkaline environment (pH >12.5). In this investigation, the alkali-resistant basalt fabric was successfully assembled by structuring mussel-inspired polydopamine (PDA) and zirconia (ZrO₂) coatings on fabric surfaces. SEM, SWCA, XRD, FI-IR, RS, and XPS were used to analyze them. The mechanical properties of the different basalt fiber bundles accelerated aging in sodium hydroxide solution were tested. The interfacial behavior between basalt fiber bundles before and after modification and concrete matrix was studied by the acoustic emission (AE) technique. The results illustrated that dense PDA and ZrO₂ coatings were dropped onto the surface of the basalt fabric. After being corroded by alkali solution, the final strength retention ratio of modified fabrics was superior to the original basalt fabric. Load–displacement curves of interfacial behavior could be well correlated with AE data in different loading stages of damage initiation, evolution and propagation. A five-stage linear local bond-slip model was proposed to describe the interfacial process between a basalt fiber bundle and concrete.

摘要

玄武岩织物在受到氢氧根离子侵蚀时其内部四面体结构遭到破坏, 极大影响了玄武岩纤维在建筑工程领域的应用, 因为混凝土基体呈现为强碱环境 (pH > 12.5) 。这项研究中, 在玄武岩织物表面上构造受贻贝启发的聚多巴胺 (PDA) 和氧化锆 (ZrO₂) 涂层来制备耐碱玄武岩织物。通过扫描电镜, 静态接触角, X射线衍射, 傅里叶红外光谱, 拉曼光谱和x射线光电子能谱对织物表面进行分析。对浸泡在氢氧化钠溶液中的不同玄武岩纤维束加速老化后的力学性能进行测试。通过声发射技术对改性前后玄武岩纤维束与混凝土之间的界面性能进行研究。结果表明致密的聚多巴胺和氧化锆涂层接枝在玄武岩织物表面。经过碱溶液侵蚀后, 改性后的玄武岩织物的强度保留率远高于原始的玄武岩织物。在界面损伤的起始, 演变和扩展过程中, 荷载位移曲线和声发射数据保持较高的相关性。本文提出一种五段式线性局部粘结滑移模型用于描述玄武岩纤维束与混凝土之间的界面行为。

KEYWORDS:

• Basalt textile
• modified
• alkali resistance
• interfacial behavior
• acoustic emission

关键词:

• 玄武岩织物
• 改性
• 耐碱性能
• 界面行为
• 声发射

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by the Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_1785]; Fundamental Research Funds for the Central Universities [JUSRP52007A]; National Key Research and Development Program of China [2016YFB0303200].