Research on the Mechanical Properties and Toughening Mechanism of HTCC for CAES Gas Storage Lining
In order to develop cement-based composite materials that meet the performance requirements of CAES underground gas storage lining and reduce high-pressure gas leakage,high toughness cementitious composites(HTCC)are prepared by using quartz sand and PVA fibers,and mechanical performance and microstructure tests are conducted to explore the toughening mechanism and crack control ability of PVA fibers.The results show that the ultimate tensile strength of HTCC produced by fly ash,quartz sand,and PVA fibers can reach 5.44 MPa and the ultimate tensile strain is 2.13%.HTCC has a low elastic modulus,strong adaptability to deformation,and obvious ductile failure characteristics when subjected to compres-sion failure.The ratio of HTCC ultimate tensile strength to initial crack strength is between 1.05 and 1.46,and the average crack width is below 60 μm,with excellent crack control ability.The bonding force between PVA fibers and the matrix interface,as well as the bridging effect of fibers in the matrix,are the main reasons for HTCC toughening and crack resistance.The high toughness and crack control ability of HTCC can meet the performance requirements of the lining structure of CAES underground gas storage.
CAES gas storageHTCCmechanical propertiestoughening mechanismcrack control
国家科技期刊平台
NSTL
万方数据
