摘要
采用60%的超细工业废渣取代水泥,采用粒径为2.5～3.0 mm的天然砂取代粒径为600μm的磨细石英砂,并掺加了Dm ax为5、10和15 mm的粗集料,制备出抗压强度达200M Pa的超高性能水泥基复合材料（UHPCC）;并采用分离式霍普金森压杆装置对不同纤维掺量的UHPSFRCC材料进行了一次和多次冲击压缩实验。对材料的多次冲击压缩标准化强度进行了定义,揭示出了应变率、冲击次数、冲击方式、纤维掺量影响材料抗冲击性能的规律。试验表明,UHPSFRCC抗冲击的能力随纤维掺量的增加不断提高;动态性能因掺入用作粗集料的玄武岩碎石而得到了相应的提升;动态强度随应变率的提高相应地增长;损伤程度随冲击次数的增加不断地加剧、标准化强度则相应地下降。承受多次冲击的UHPSFRCC试件随冲击次数的增加其冲击下峰值应力的下降速度也将增大。
Innovative ultra-high performance fiber reinforced cementitious composites （UHPFRCC） with 200MPa compressive strength was discussed in this contribution. Compared with traditional UHPFRCC, this materials has three special characteristics： Firstly 60% cement by mass was replaced by uhra-fine industrial waste powders（i, e. fly ash and slag）, Secondly, the ground fine quartz sand used in traditional UHPCC was totally replaced by nature fine aggregates with maximum diameter of 2.5 ～ 3.0 mm, and thirdly incorporation of the coarse aggregate with maximum diameter of 5, 10 and 15 mm were considered. Split Hopkinson Pressure Bar（SHPB） was employed to investgate the dynamic behavior of UHPFRCCs with various content of steel fiber. The impact modes of interest include single/repeated impact of various modes. The effects of stain rate, impact times, impact modes and fiber volume fraction on the properties of impact were investigated. Results demonstrated that the impact resistance of UHPSFRCC improves with the increase of fiber volume ffaction, the dynamic strength of UHPSFRCC improves with the increase of strain rate, the damage of material increased and the standard strength decreased with the increase of impact times, and for the specimens subjected to repeated impacts, the attenuating rate of peak stress of UHPFRCC increases with the the impact times.
出处
《解放军理工大学学报（自然科学版）》
EI
2007年第5期443-453,共11页
Journal of PLA University of Science and Technology(Natural Science Edition)
