采用三点弯曲冲击试验装置,结合超声波测试技术,研究了玄武岩纤维质量分数为0%～0.60%时,玄武岩纤维增韧混凝土(Basalt Fiber Reinforced Concrete,BFRC)的冲击性能及其损伤演化规律,研究了混凝土冲击破坏过程中基于超声波波速的损伤演化过程,并应用体视显微镜观测了冲击过程中试件表面裂纹的发展,分析了玄武岩纤维提高混凝土冲击韧性的机制.结果表明:玄武岩纤维对混凝土的抗压强度无明显改善,但可以显著提高混凝土的冲击韧性,当纤维质量比为0.36%时冲击韧性提高了2.2倍.各玄武岩纤维掺量下混凝土的冲击破坏均表现出脆性特征,但玄武岩纤维的加入有效提高了混凝土对冲击能量的吸收,其临近破坏时损伤变量较素混凝土提高了40%～83%;玄武岩纤维混凝土冲击破坏过程表现出多缝开裂的特征,在最终破坏时主裂缝附近有明显的副裂缝出现.
参考文献
| [1] | 崔毅华.玄武岩连续纤维的基本特性[J].纺织学报,2005,26(5):120-121.Cui Yihua.Primary properties of basalt continuous filament[J].J Spin,2005,26(5):120-121. |
| [2] | Sim J,Park C,Moon D Y.Characteristics of basalt fiber as a strengthening material for concrete structures[J].Composites Part B,2005,36:504-512. |
| [3] | Zielinski K,Olszewski P.The impact of basaltic fibre on selected physical and mechanical properties of cement mortar[J].Concrete Precasting Plant and Technology,2005(71):28-33. |
| [4] | Dias D P,Thaumaturgo C.Fracture toughness of geopolymetric concretes reinforced with basalt fibers[J].Cement and Concrete Composites,2005,27(1):49-54. |
| [5] | 李为民,许金余.玄武岩纤维对混凝土的增强和增韧效应[J].硅酸盐学报,2008,36(4):476-481.Li Weimin,Xu Jinyu.Strengthening and toughening in basalt fiber reinforced concrete[J].J Chin Ceram Soc,2008,36(4):476-481. |
| [6] | 李为民,许金余,沈刘军,李庆.玄武岩纤维混凝土的动态力学性能[J].复合材料学报,2008,25(2):135-142.Li Weimin,Xu Jinyu,Shen Liujun,Li Qing.Dynamic mechanical properties of basalt fiber reinforced concrete using a split Hopkinson pressure bar[J].Acta Materiae Compositae Sinica,2008,25(2):135 142. |
| [7] | Li W M,Xu J Y.Machanical properties of basalt fibers reinforced geopolymetric concretes under impact loading[J].Materials Science and Engineering:A,2009,505:178-186. |
| [8] | Li W M,Xu J Y.Impact characterization of basalt fiber reinforced geopolymeric concrete using a 100 mm-diameter split Hopkinson pressure bar[J].Materials Science and Engineering:A,2009,513/514:178-186. |
| [9] | ACI committee 544.Measurement of propertise of fibre reinforced cement[J].ACI Mater J,1988,85(6):583-589. |
| [10] | 宋玉普.混凝土结构的疲劳性能及设计原理[M].北京:机械工业出版社,2006:169-178. |
| [11] | 沈荣熹,崔琪,李青海.新型纤维增强水泥基复合材料[M].北京:中国建材工业出版社,2003:83-85. |
| [12] | Pigott M R.Theoretical estimation of fracture of fibrous composites[J].Journal of Materials Science,1970,5(8):669-675. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%