化工矿物与加工2025，Vol.54Issue(6)：29-36,8.DOI:10.16283/j.cnki.hgkwyjg.2025.06.004
冻融-弯折作用下玄武岩纤维混凝土损伤演化规律及裂纹特征
Study on damage evolution and crack characteristics of basalt fiber concrete under freezing-thawing-bending
李小双 1肖定军 1龙宇 1章欣宇 1裴广朝 1韩森1
作者信息
- 1. 西南科技大学 环境与资源学院,四川 绵阳 621010
- 折叠
摘要
Abstract
In order to explore the damage evolution law and crack characteristics of basalt fiber reinforced concrete in freeze-thaw environment,the microcomputer-controlled universal testing machine system was used to conduct four-point bending tests on basalt fiber reinforced concrete samples with freeze-thaw cycles of 0,5,10,15,20,25,and 30 times,respectively.In the analysis of damage evolution,in addition to the two indexes of relative dynamic elastic modulus and ultrasonic wave velocity,the"neutral layer position"was used to reflect the internal damage of concrete.In the study of crack characteristics,the concept of"relative angle"was used to quantitatively analyze the variation law of cracks.The results show that under the action of freeze-thaw cycles,the relative dynamic elastic modulus and wave velocity of the specimen show a decreasing trend,and the position of the neutral layer gradually moves up with the increase of the number of freeze-thaw cycles.When the crack propagates forward through the aggregate,there are two modes of"one"shape expansion and obstacle avoidance expansion.With the increase of the number of freeze-thaw cycles,the relative angle presents three different ranges,corresponding to the three periods of freeze-thaw(non-freeze-thaw,early freeze-thaw,late freeze-thaw).Combined with the microscopic characteristics of the specimen section,the three failure mechanisms corresponding to the three periods are obtained.The research results have certain reference value for understanding the damage and fracture evolution of basalt fiber reinforced concrete under freeze-thaw action.关键词
冻融循环/玄武岩纤维混凝土/相对动弹性模量/超声波波速/裂纹扩展/相对角/中性层Key words
freeze-thaw cycle/basalt fiber concrete/relative dynamic elastic modulus/ultrasonic wave velocity/crack propagation/relative angle/neutral layer分类
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李小双,肖定军,龙宇,章欣宇,裴广朝,韩森..冻融-弯折作用下玄武岩纤维混凝土损伤演化规律及裂纹特征[J].化工矿物与加工,2025,54(6):29-36,8.
