EXPERIMENTAL RESEARCH ON THE EFFECT OF FLAKE MODIFICATION ON MICRO-CRACK RESISTANCE OF CONCRETE
-
摘要: 工程中常采用在混凝土中添加纤维的方法来增强混凝土的抗裂能力。鳞片是一种具有良好力学性能的微米级材料,通过在混凝土中添加不同掺量、不同规格的玻璃鳞片、玄武岩鳞片,进行6组混凝土平板试验、6组混凝土抗折强度测试及6组声发射测试试验,研究鳞片改性后混凝土早期抗裂性能、硬化后力学性能以及断裂过程中裂缝发展的变化规律。试验结果表明:鳞片能有效减少混凝土早期裂缝开裂面积,提升抗折强度,且主要提高了混凝土中微米级细观抗裂能力。Abstract: The method of adding fiber into concrete has been commonly used in engineering to improve the crack resistance of concrete. The flake is a micron-sized material with good mechanical properties and corrosion resistance. In the paper, six groups of concrete flat plate tests, six groups of concrete flexural strength tests and six groups of acoustic emission tests were carried out by adding different contents of glass flake and basalt flake into concrete. The early crack resistance, mechanical properties after hardening, fracture process of concrete modified by flake and the change law of the development of the middle fracture were studied. The test results showed that flake could effectively reduce the early cracking area of concrete, improve the flexural strength, and mainly improve the micro-crack resistance of concrete.
-
Key words:
- flake /
- concrete /
- crack resistance /
- flat plate test /
- bending test /
- acoustic emission test
-
梅塔P R,蒙特罗P J M. 混凝土:微观结构、性能和材料[M]. 欧阳车,译. 北京:中国建筑工业出版社, 2016 赵国藩. 钢纤维混凝土结构[M]. 北京:中国建筑工业出版社, 1999. 陈志鹏. 碳纤维混凝土的研究与应用进展[C]//第十六届全国现代结构工程学术研讨会论文集.重庆:重庆大学出版社, 2012:238. 邓宗才. 高性能合成纤维混凝土[M]. 北京:科学出版社, 2003. YU K, WANG Y, YU J, et al. A Strain-Hardening Cementitious Composites with the Tensile Capacity up to 8%[J]. Construction and Building Materials, 2017,137:410-419. LI V C, HORII H. From Micromechanics to Structural Engineering:The Design of Cementitious Composites for Civil Engineering Applications[J]. Proceedings of the Japan Society of Civil Engineers, 1993, 471(10):1-12. NOUSHINI A, VESSALAS K, SAMALI B. Static Mechanical Properties of Polyvinyl Alcohol Fibre Reinforced Concrete (PVA-FRC)[J]. Magazine of Concrete Research, 2014, 66(1):1-19. 张基沛. 玻璃鳞片涂料的重防腐蚀作用[J]. 腐蚀与防护, 2003, 24(9):401-402. 王晓东,侯锐钢,茆凌峰,等. 玻璃鳞片涂料的应用状况[J]. 腐蚀科学与防护技术, 2001, 13(增刊1):487-489. 娄建立. 玄武岩水晶粉体及玻璃鳞片和玻璃鳞片增强水泥砂浆防水性[D].天津:天津工业大学, 2013. 中华人民共和国国家质量监督检验检疫总局.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082-2009[S].北京:中国建筑工业出版社, 2009. 中华人民共和国建设部, 国家质量监督检验检疫总局.普通混凝土力学性能试验方法标准:GB/T 50081-2002[S]. 北京:中国建筑工业出版社, 2003. 彭竹君,肖洋,王乾峰,等. 基于声发射技术的冻融劣化混凝土单双轴动态抗压试验[J]. 水电能源科学,2019,37(2):131-134,94. 王岩,路桂娟,王瑶,等. 声发射技术在土木工程中的应用研究综述[J]. 水利水电科技进展,2012,32(4):89-94. 朱德滨. 基于声发射技术的高韧性水泥基复合材料开裂损伤特性[J]. 武汉理工大学学报,2012,34(7):94-97,123. 郝挺宇,惠云玲,梅名虎,等. 结构混凝土耐久性无损检测技术[J]. 东南大学学报(自然科学版),2006(增刊2):49-54. 蒋志. 声发射技术在混凝土结构探伤和评估的应用[J]. 沿海企业与科技,2007,88(9):22-26. 尹红宇,赵艳林,吕海波,等. 混凝土无损检测中常用声发射检测参数的设置[J]. 混凝土,2009,233(3):125-128. 陈兵,姚武,吴科如. 声发射技术在混凝土研究中的应用[J]. 无损检测,2000(9):387-390,396. 陈兵,姚武,张东,等. 混凝土梁破坏机制的声发射特性实验研究[J]. 建筑材料学报, 2001, 4(4):332-338. MURALIDHARA S, PRASAD B K R, ESKANDARI H, et al. Fracture Process Zone Size and True Fracture Energy of Concrete Using Acoustic Emission[J]. Construction & Building Materials, 2010, 24(4):479-486. OHNO K, UJI K, UENO A, et al. Fracture Process Zone in Notched Concrete Beam Under Three-Point Bending by Acoustic Emission[J]. Construction & Building Materials, 2014, 67(6):139-145.
点击查看大图
计量
- 文章访问数: 62
- HTML全文浏览量: 4
- PDF下载量: 1
- 被引次数: 0