摘要
利用霍普金森杆及高速-高分辨摄像技术,对比研究了纤维素纤维(CF)和改性纤维素纤维对动载荷下水泥石的力学性能、能量演变、裂纹扩展及界面破坏形式的影响。结果表明:在动载荷下水泥石的失效过程可分为4个时期,压密、微裂纹扩展、能量积累和能量释放。其中第3个时期,比能量的积累将直接影响试样的抗压强度,且当纤维掺入量相同时,掺入未改性纤维素纤维(UCF)的试样相较于改性纤维素纤维(MCF)的试样吸收能量更多,抗压强度更好;低温等离子体改性可以在纤维素纤维表面引入含氧基团,使MCF与水泥基体界面结合更为紧密,这使试样能量更偏向在漂珠等缺陷处进行聚集和释放,失效结果表现为改性纤维素纤维-油井水泥复合材料(MCF-OWC)在动载荷下抗压强度更低,失效后破碎程度更低。
Effects of cellulose fiber(CF)and modified cellulose fiber on the mechanical properties,energy evolution,crack propagation and interface failure of cement under dynamic load were investigated by splitting hopkinson pressure bar and high speed-high resolution camera technology.In the third period,the accumulation of specific energy will directly affect the compressive strength of the sample,and the sample with unmodified cellulose fiber(UCF)absorbs more energy and has better compressive strength than the sample with modified cellulose fiber(MCF)at the same fiber incorporation amount.Low-temperature plasma modification can introduce oxygen-containing groups on the surface of cellulose fiber,so that the interface between MCF and cement matrix is more closely bound.The result of this failure is since the modified cellulose fiber-oil well cement composite(MCF-OWC)has a lower compressive strength under dynamic load and a lower crushing degree after failure.
作者
程小伟
陈祖伟
李雨威
张曲
王福云
郑友志
黄盛
张春梅
刘开强
CHENG Xiaowei;CHEN Zuwei;LI Yuwei;ZHANG Qu;WANG Fuyun;ZHENG Youzhi;HUANG Sheng;ZHANG Chunmei;LIU Kaiqiang(State Key Laboratory of Oil&Gas Reservoir Geology and Exploitation,Southwest Petroleum University,Chengdu 610500,China;School of New Energy and Material,Southwest Petroleum University,Chengdu 610500,China;Cementing Company of Sinopec Xinan Oilfield Service Corporation,Deyang 618000,Sichuan,China;Exploration Division,Southwest Oil and Gas Field Company,PetroChina,Chengdu 610041,China;Petro China Southwest Oil&Gas Field Company,Guanghan 618300,Sichuan,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2021年第5期964-971,共8页
Journal of The Chinese Ceramic Society
基金
国家重点研发计划(2016YFB0303600)。
关键词
动载荷
纤维素纤维
低温等离子改性
油井水泥石
失效
dynamic load
cellulose fibers
low temperature plasma modification
oil well cement paste
failure
