石墨烯纳米片增强水泥砂浆的抗氯离子扩散和抗硫酸盐侵蚀性能  

Chloride Ion Diffusion and Sulfate Resistance of Graphene Nanosheet Plate Reinforced Cement Mortar

作　　者：应敬伟[1,2] 苏飞鸣 席晓莹 刘剑辉 YING Jingwei;SU Feiming;XI Xiaoying;LIU Jianhui(School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Institute of Science and Technology for Carbon Peak and Neutrality,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学土木建筑工程学院,南宁530004 [2]广西大学双碳科学与技术研究院,南宁530004

出　　处：《材料导报》2024年第9期101-109,共9页Materials Reports

基　　金：国家自然科学基金(52168015,51768005);广西科技计划项目(2023GXNSFAA026472,AB16380030)。

摘　　要：本工作研究了石墨烯纳米片(GNP)对水泥砂浆抗氯离子扩散性能和抗硫酸盐侵蚀性能的影响,并采用热重分析法、压汞分析法、X射线衍射、扫描电镜和能谱分析对GNP复合水泥砂浆的微观形貌和水化产物类别进行了表征,解释了GNP增强水泥砂浆抗氯离子扩散性能和抗硫酸盐侵蚀性能的机理。结果表明:与普通水泥砂浆相比,掺入0.1%水泥质量的GNP后,水泥砂浆的28 d抗压、抗折强度分别提高了11.1%和12.7%,表面氯离子浓度和扩散系数分别减小了36.8%和11.3%,经硫酸盐侵蚀后质量损失率为0.44%,抗蚀系数提升至0.9;GNP对水泥水化的产物类别没有影响,但GNP可以促进水泥的水化反应并细化水泥砂浆中的孔径;GNP作为水泥中的纳米添加材料能够填充在水泥熟料附近,使水泥砂浆的微观结构更为密实,且GNP较大的比表面积和二维板状结构也可以成为腐蚀离子的物理屏障。The influence of graphene nanosheet plate(GNP)on chloride ion diffusion resistance and sulfate corrosion resistance of cement mortar was studied in this work.The micro-morphology and classification of hydration products of GNP composite cement mortar were characterized by thermogravimetry,mercury intrusion analysis,X-ray diffraction,scanning electron microscopy and energy spectrum analysis,and the mechanism of GNP enhancing chloride ion diffusion resistance and sulfate corrosion resistance of cement mortar was explained.The results show that compared with common cement mortar,the compressive and flexural strength of cement mortar increased by 11.1%and 12.7%,respectively,after adding 0.1%GNP by 28 days,and the apparent chloride ion concentration and diffusion coefficient decreased by 36.8%and 11.3%,respectively.GNP has no effect on the product category of cement hydration,but GNP can promote the hydration reaction of cement and refine the pore size in cement mortar;as a nano additive in cement,GNP can be filled near cement clinker,increasing the compact of the cement mortar,and the large specific surface area and two-dimensional plate structure of GNP can also serve as a physical barrier for corrosive ions.

关 键 词：石墨烯纳米片 强度 氯离子扩散 硫酸盐侵蚀 微观结构 

分 类 号：TU528.59[建筑科学—建筑技术科学]