摘要
为更好地研究钢纤维混杂方式对水泥基材料的增强作用,本研究使用长度分别为6 mm(S)、13 mm(M)和35 mm(H)的三种钢纤维,进行单掺、双掺、三掺制备钢纤维增强水泥基材料,采用圆柱体试件进行落锤冲击试验,从冲击次数及耗能、破坏形态、裂缝宽度发展等方面探究混杂方式对水泥基材料抗冲击性能及阻裂能力的影响。试验结果表明:钢纤维从单掺到三掺,材料抗冲击性能逐渐增强。钢纤维单掺对水泥基材料强度及抗冲击性能提升效果依次为:M>H>S;双掺组合方式从优到劣为:M+H>S+M>S+H,当1.5%(体积分数,下同)M与0.5%H混掺时材料的增强、增韧效果最佳,28 d抗折强度为22.6 MPa,较单掺M和H分别提高了3.2%和31.4%,抗压强度为154.8 MPa,较单掺M和H分别提高了40.1%和65.5%,初裂与破坏冲击耗能比单掺M和H分别提高了23.5%、425%和36.7%、300%;三掺最优掺量为0.5%S、0.5%M和1%H,初裂和破坏冲击耗能比最优双掺M1.5H0.5组分别提高了33.3%、1.9%。双参数的Weibull分布可以合理地描述钢纤维混杂增强水泥基材料的初裂冲击次数(N1)和破坏冲击次数(N2)。S抑制微裂缝的产生与扩张,M和H阻止宏观裂缝在不同受荷阶段的发展,在不同结构层次、不同受荷阶段发挥逐级阻裂作用。
In order to better study the reinforcement effect of hybrid steel fiber on cement-based materials,three kinds of steel fibers with lengths of 6 mm(S),13 mm(M)and 35 mm(H)were used to prepare cylindrical specimens for drop weight impact test.The effects of steel fiber hybrid methods on the impact resistance and crack resistance of cement-based materials were explored from the aspects of impact times,energy consumption,failure pattern and crack width development.The test results show that the impact resistance of steel fiber increases gradually from single to triple mixing.The increasing effect of steel fiber on the strength and impact resistance of cement-based materials is M>H>S.The combination mode of steel fiber double mixing is M+H>S+M>S+H.When 1.5%M and 0.5%H were mixed,the strengthening and toughening effect of steel fiber was the best,and the bending strength of steel fiber was 22.6 MPa at 28 d,which was 3.2%and 31.4%higher than that of M and H alone.The compressive strength of 28 d was 154.8 MPa,which was 40.1%and 65.5%higher than that of M and H,respectively.The energy consumption of initial crack shock was 23.5%and 425%higher than that of two fibers,and the energy consumption of failure shock was 36.7%and 300%higher than that of two fibers,respectively.The optimal dosage of the three kinds of steel fibers was 0.5%S,0.5%M and 1%H,respectively,and the energy consumption of initial cracking and failure shock was 33.3%and 1.9%higher than that of the optimal dual-mixing group(M1.5H0.5),respectively.The two parameter Weibull distribution can reasonably describe N1 and N2 of steel fiber hybrid reinforced cement-based materials.S inhibits the creation and expansion of microcracks,while M and H prevent the development of macroscopic cracks at different stages of loading.The various fibers act as progressive crack arrestors at different structural levels and in different loading stages.
作者
郭远臣
刘芯州
王雪
叶青
向凯
王锐
GUO Yuanchen;LIU Xinzhou;WANG Xue;YE Qing;XIANG Kai;WANG Rui(School of Civil Engineering,Chongqing Three Gorges University,Chongqing 404000,China)
出处
《材料导报》
EI
CSCD
北大核心
2024年第2期77-84,共8页
Materials Reports
基金
重庆市教育委员会科学技术研究项目(KJZD-K201901201
KJZD-202101201)
重庆青年·拔尖人才(CQYC201905086)
万州区创新创业示范团队
重庆市三峡水库岸坡与工程结构灾变防控工程技术研究中心开放基金项目(SXAPGC21MS05)。
关键词
水泥基材料
钢纤维混杂
抗冲击性能
阻裂能力
cement-based material
hybrid steel fiber
impact resistance
crack resistance capacity
