| 安茹,陈国雄,李源康,符师桦*.基于数字图像相关的玄武岩纤维增强混凝土抗压实验研究[J].实验力学,2023,38(4):446~454 |
| 基于数字图像相关的玄武岩纤维增强混凝土抗压实验研究 |
| Experimental investigation of compressive behavior of basalt fiber reinforced concrete by digital image correlation |
| 投稿时间：2022-08-29 修订日期：2022-11-10 |
| DOI：10.7520/1001-4888-22-209 |
| 中文关键词: 数字图像相关 玄武岩纤维混凝土 力学性能 应变场演化 裂纹扩展 |
| 英文关键词:digital image correlation basalt fiber concrete mechanical properties strain evolution crack propagation |
| 基金项目:国家自然科学基金项目(11802080)；海南省自然科学基金项目(118QN182和520CXTD433) |
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| 中文摘要: |
| 制备不同玄武岩纤维(Basalt Fiber，BF)掺量的玄武岩纤维增强混凝土(Basalt fiber Reinforced Concrete，BFRC)试块，结合数字图像相关(Digital Image Correlation，DIC)方法研究了BF对混凝土抗压特性的影响。结果表明，混凝土中加入适量BF可以提高其抗压强度和劈裂抗拉强度，但过量的BF会产生负面效果，且BFRC的抗压强度与劈裂抗拉强度呈线性关系;当BF掺量为0.6%时，增强效果最佳，其抗压强度比素混凝土增大24.40%，劈裂抗拉强度比素混凝土增大38.84%。通过DIC方法获取试件抗压破坏的全场应变演化，并通过应变场观察到微裂纹和宏观裂纹的发展过程。素混凝土微裂纹扩展路径单一，且宏观裂纹扩展速度较快；对于BFRC试件，微裂纹出现在多个区域，各区域微裂纹独自发展，且宏观裂纹路径较为复杂。基于应变场特征将BFRC的压缩破坏过程分为微裂纹萌生、微裂纹扩展、宏观裂纹扩展3个阶段，并分别讨论了BF在每个阶段的作用效果和机理。 |
| 英文摘要: |
| The influence of basalt fiber(BF)on compressive behavior was studied in basalt fiber reinforced concrete(BFRC) with various BF contents by using digital image correlation(DIC). The results showed that the incorporation of BF with appropriate contents elevated the compressive strength and splitting tensile strength of concrete while the incorporation of BF with excessive contents led to a negative effect. The compressive strength of BFRC showed a linear relationship with the splitting tensile strength. Under the optimal content of BF, the compressive strength is 24.40% higher than that of plain concrete and the splitting tensile strength is 38.84% higher than that of plain concrete. The evolutions of the strain field during the compressive processes of BFRC with various BF contents were obtained by DIC. The evolutions of micro-cracks and macro-cracks were observed via strain field. For plain concrete, the micro-cracks propagated principally in a single path and the macro-cracks expanded at a high rate. For BFRCs, the micro-cracks initiated and propagated respectively in several regions, and the macro-cracks expanded at low rates with complex paths. Based on the characteristic of the strain field, the failure process was divided into three stages: micro-crack initiation, micro-crack propagation, and macro-crack propagation. Also, the effect of BF on each stage was discussed. |
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