摘要
为改善混凝土的抗拉强度和韧性,设计了不同掺量(0、1.0、1.5、2.0、2.5kg/m^3)的玄武岩纤维风积沙混凝土,利用自制落锤装置开展玄武岩纤维风积沙混凝土不同养护龄期(标准养护7d和28d)的抗冲击性能试验研究,并分析纤维阻裂增韧机理。结果表明:玄武岩纤维提高了风积沙混凝土的抗冲击次数、冲击功、抗冲击韧性比和冲击延性指标。标养7d的冲击延性指标值均大于28d,掺量为1.0kg/m3时,7d的延性指标最大,为素混凝土的1.76倍;掺量为1.5kg/m^3时,冲击功和抗冲击韧性比最大;玄武岩纤维在风积沙混凝土中的最佳掺量为1.0~1.5kg/m^3。纤维增强混凝土抗冲击性能依靠纤维与水泥基体之间的锚固作用实现,破坏主要发生在纤维与水泥界面区的水泥石处。
In order to improve the tensile strength and toughness of concrete,basalt fiber reinforced aeolian sand concretes with different dosages(0,1.0,1.5,2.0,2.5 kg/m^3)were designed.A self-made drop hammer device was applied to carry out the experimental study on the impact resistance of basalt fiber reinforced aeolian sand concrete at different curing ages(standard curing 7 d and 28 d).The cracking resistance and toughening mechanism of the fiber were analyzed.The results show that basalt fiber enhances the impact times,impact energy,impact toughness ratio and ductility index of aeolian sand concrete.The impact ductility values under the standard curing for 7 d are all greater than those for 28 d.And the ductility index of 7 d is the largest when the dosage is 1.0 kg/m^3,which is 1.76 times than that of plain concrete.The impact energy and toughness will be the largest when the dosage is 1.5 kg/m^3.The best dosage of basalt fiber in aeolian sand concrete is 1.0-1.5 kg/m^3.The impact resistance of fiber reinforced concrete depends on the anchoring effect between fiber and cement.Damage is mainly at the cement stone in the interface area between fiber and cement.
作者
董伟
林艳杰
肖阳
薛慧君
DONG Wei;LIN Yanjie;XIAO Yang;XUE Huijun(College of Civil Engineering,Inner Mongolia University of Science and Technology, Baotou,Inner Mongolia 014010,China;College of Water Conservancy and Civil Engineering,Inner Mongolia Agricultural University,Hohhot 010018,China)
出处
《中国科技论文》
CAS
北大核心
2019年第4期447-451,共5页
China Sciencepaper
基金
国家自然科学基金资助项目(51569021,51769025)
内蒙古自治区自然科学基金资助项目(2017BS0505)
关键词
玄武岩纤维风积沙混凝土
抗冲击性能
最佳掺量
阻裂增韧
锚固作用
basalt fiber reinforced aeolian sand concrete
impact resistance
optimal content
cracking resistance and toughness
anchorage effect
