李 涛1,范 钰1,王爽倩1,龙莉波2,马跃强2
李涛,范钰,王爽倩,等.硫酸盐侵蚀后UHPC-NC结合面的抗渗性能研究[J].混凝土与水泥制品,2025(1):53-58.
LI T,FAN Y,WANG S Q,et al.Study on impermeability of the bonding surface of UHPC-NC under sulphate erosion[J].China Concrete and Cement Products,2025(1):53-58.
硫酸盐侵蚀后UHPC-NC结合面的抗渗性能研究
李 涛1,范 钰1,王爽倩1,龙莉波2,马跃强2
李涛,范钰,王爽倩,等.硫酸盐侵蚀后UHPC-NC结合面的抗渗性能研究[J].混凝土与水泥制品,2025(1):53-58.
LI T,FAN Y,WANG S Q,et al.Study on impermeability of the bonding surface of UHPC-NC under sulphate erosion[J].China Concrete and Cement Products,2025(1):53-58.
摘 要:研究了结合面粗糙度(Ⅰ、Ⅱ)、硫酸盐侵蚀龄期(0、45、90、210、330 d)对超高性能混凝土-普通混凝土(UHPC-NC)试件结合面抗渗性能的影响,并分析了微观机理。结果表明:无论结合面的粗糙度多大,随着侵蚀龄期的增加,UHPC-NC试件结合面的抗渗性能基本呈先增后降的趋势,当侵蚀龄期为90 d时,UHPC-NC试件结合面的抗渗性能相对最好;总体而言,相较于粗糙度为Ⅰ的UHPC-NC试件结合面,粗糙度为Ⅱ的UHPC-NC试件结合面的抗渗性能相对更好;在硫酸盐侵蚀下,UHPC-NC试件内部孔隙中生成了具有膨胀性的腐蚀产物(石膏、钙矾石),当其过量时会导致混凝土内部拉应力增大,产生膨胀裂缝,从而削弱UHPC-NC试件结合面的抗渗性能。
Abstract: The effects of the roughness(Ⅰ,Ⅱ) of bonding surface and the age (0, 45, 90, 210 and 330 d) of sulphate erosion on the impermeability of the bonding surface of ultra-high performance concrete-normal concrete(UHPC-NC) specimens were investigated, and the microscopic mechanism was analyzed. The results show that, regardless of the roughness of the bonding surface, with the increase of the erosion age, the impermeability of the bonding surface of UHPC-NC specimens basically shows a trend of first increasing and then decreasing, and the impermeability of the bonding surface of UHPC-NC specimens is basically the best when the erosion age is 90 d. Overall, the impermeability of the bonding surface of UHPC-NC specimens with roughness Ⅱ is better than that of the UHPC-NC specimens with roughness Ⅰ. Under the erosion of sulphate, the expansive corrosion products(gypsum, ettringite) are generated in the internal pores of the UHPC-NC specimen. When excessive, it can cause an increase in the internal tensile stress of the concrete, resulting in expansion cracks, and thus weakening the impermeability of the bonding surface of the UHPC-NC specimens.
版权所有:中国混凝土与水泥制品网 苏ICP备10086386号 网站建设:中企动力 苏州