LDHs-NO_(2)对水泥砂浆性能及钢筋锈蚀的影响  

Effect of LDHs-NO_(2)on Properties of Cement Mortar and Corrosion of Steel Bar

作　　者：张轶 张彪 邓翔文 何宏杰 ZHANG Yi;ZHANG Biao;DENG Xiangwen;HE Hongjie(School of City and Architecture Engineering,Zaozhuang University,Zaozhuang 277100,China;College of Art and Design,Zaozhuang University,Zaozhuang 277100,China;College of Civil Engineering,Tongji University,Shanghai 200092,China)

机构地区：[1]枣庄学院城市与建筑工程学院,枣庄277100 [2]枣庄学院美术与艺术设计学院,枣庄277100 [3]同济大学土木工程学院,上海200092

出　　处：《硅酸盐通报》2025年第1期1-10,共10页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(52008234)。

摘　　要：本文采用水热法将NO_(2)^(-)插层到Zn-Al-LDHs(LDHs为层状双金属氢氧化物)层间制备了改性水滑石(LDHs-NO_(2)),并对LDHs-NO_(2)进行表征,探究了不同掺量LDHs-NO_(2)对水泥砂浆流动性、力学性能、氯离子扩散系数、孔隙结构、氯离子吸附量和钢筋阻锈性能的影响。试验结果表明,在水泥砂浆中掺入不同掺量LDHs-NO_(2),水泥砂浆的抗压、抗折强度提高,同时氯离子扩散系数和孔隙率降低。与基准组相比,掺加2%(质量分数)LDHs-NO_(2)的水泥砂浆性能提升最为显著,之后随着LDHs-NO_(2)掺量(4%、6%)继续增加,水泥砂浆的流动性、力学性能降低,但仍高于基准组;孔隙率有所增大,但仍低于基准组。LDHs-NO_(2)通过层间离子交换实现对Cl^(-)的吸附,在吸附Cl^(-)过程中伴随着层间NO_(2)^(-)的释放。LDHs-NO_(2)能够有效延缓水泥砂浆中的钢筋锈蚀,且在一定范围内LDHs-NO_(2)掺量越多,水泥砂浆中钢筋的耐腐蚀性能越好。In this paper,NO_(2)^(-)was intercalated into the interlayer of Zn-Al-LDHs(layered double hydroxides,LDHs)by hydrothermal method to prepare modified hydrotalcite(LDHs-NO_(2)),and LDHs-NO_(2)was characterized.The effect of different LDHs-NO_(2)content on the fluidity,mechanical properties,chloride ion diffusion coefficient,pore structure,chloride ion adsorption of cement mortar and corrosion resistance of steel bar was investigated.The test results show that the compressive strength and flexural strength of cement mortar are improved,and the chloride ion diffusion coefficient and porosity are decreased by adding different content of LDHs-NO_(2)into cement mortar.Compared with the reference group,the performance of cement mortar with 2%(mass fraction)LDHs-NO_(2)is the most significant.Then,with the continuous increase of LDHs-NO_(2)content(4%,6%),the fluidity and mechanical properties of mortar decrease,but still higher than the reference group.The porosity of cement mortar has increased,but it is still lower than the reference group.LDHs-NO_(2)achieves the adsorption of Cl^(-)through interlayer ion exchange,which is accompanied by the release of interlayer NO-2 during the adsorption of Cl^(-).LDHs-NO_(2)can effectively delay the corrosion of steel bars in cement mortar,and the more LDHs-NO_(2)content in a certain range,the better the corrosion resistance of steel bars.

关 键 词：水泥砂浆 改性水滑石 氯离子吸附 钢筋锈蚀 阻锈机理 

分 类 号：TU528[建筑科学—建筑技术科学]