CAJ | 학술논문

采用显微硬度、MIP、SEM-EDXA研究了超低离子渗透性水泥基材料(Ultra Low Ion Permeability Cementitious Materials,简称ULIPCM)的微观结构,同时研究了ULIPCM的宏观性能.结果表明:ULIPCM的28 d抗压强度≥80 MPa,抗折强度≥11.0 MPa,弹性模量在38.0～42.0 GPa之间;Cl-扩散系数≤0.8×10~-(13)m~2·s~-1,6 h导电量≤300 C;抗硫酸盐侵蚀性能较好;28 d收缩值可控制在400×10~-6以内.ULIPCM的集料与水泥石界面过渡区的微观结构和性能得到了显著改善,有利于提高其力学性能和抗渗性能.ULIPCM的集料与水泥石界面过渡区由普通混凝土的60～100μm细化为30μm以下,有效阻断了侵蚀性介质的渗入通道;ULIPCM的孔隙率、最可几孔径等孔结构参数均得到了优化,显著改善了其孔结构;ULIPCM的集料与水泥石界面过渡区中的CH晶体较少,且CH晶体的取向性差.
채용현미경도、MIP、SEM-EDXA연구료초저리자삼투성수니기재료(Ultra Low Ion Permeability Cementitious Materials,간칭ULIPCM)적미관결구,동시연구료ULIPCM적굉관성능.결과표명:ULIPCM적28 d항압강도≥80 MPa,항절강도≥11.0 MPa,탄성모량재38.0～42.0 GPa지간;Cl-확산계수≤0.8×10~-(13)m~2·s~-1,6 h도전량≤300 C;항류산염침식성능교호;28 d수축치가공제재400×10~-6이내.ULIPCM적집료여수니석계면과도구적미관결구화성능득도료현저개선,유리우제고기역학성능화항삼성능.ULIPCM적집료여수니석계면과도구유보통혼응토적60～100μm세화위30μm이하,유효조단료침식성개질적삼입통도;ULIPCM적공극솔、최가궤공경등공결구삼수균득도료우화,현저개선료기공결구;ULIPCM적집료여수니석계면과도구중적CH정체교소,차CH정체적취향성차.
Microstructure and macro-performance of Ultra Low Ion Permeability Cementitious Materials (ULIPCM) were investigated by Micro-hardness, MIP and SEM-EDXA.It was shown that the compressive strength of ULIPCM was more than 80 Mpa, flexural strength was more than 11.0 Mpa, and elastic modulus was in the range of 38.0 to 42.0 Gpa at the age of 28 days; chloride diffusion coefficient was lower than 0.8X 10~-(13)m~2·s~(-1) , conductive charge for 6 hours was lower than 300 coulombs; sulfate attack resistance was good; shrinkage at the age of 28 days was lower than 400 X 10~-6. Compared with ordinary concrete with which thickness of interfacial transition zone is 60 to 100 μm, the thickness of interfacial transition zone of UI.IPCM was lower than 30 μm. Penetration paths of corrosive medium were effectively interrupted in ULIPCM. And pore structure parameters, such as porosity and the most probable pore radius of ULIPCM, were also obviously optimized in ULIPCM. Besides, few CH crystals were in the ULIPCM aggregate and the interfacial transition zone of ULIPCM. And the orientation of CH crystals was poor.