早龄期纳米改性水泥砂浆抗海水侵蚀性能研究  

Research on the resistance of early-age nano modified cement mortar to seawater erosion

作　　者：盛子洋 张世义 王咏琪 SHENG Ziyang;ZHANG Shiyi;WANG Yongqi(School of Civil Engineering and Geomatics,Shandong University of Technology,Zibo 255049,China)

机构地区：[1]山东理工大学建筑工程与空间信息学院,山东淄博255049

出　　处：《山东理工大学学报(自然科学版)》2025年第3期44-50,56,共8页Journal of Shandong University of Technology:Natural Science Edition

基　　金：国家自然科学基金项目(51908342)。

摘　　要：为提升传统水泥砂浆抗海水腐蚀性能,利用纳米偏高岭土改善水泥砂浆的早龄期物理力学性能。通过模拟海水试验,分析了干湿循环条件下早龄期纳米偏高岭土水泥砂浆外观及抗折/抗压强度变化规律,并结合扫描电镜、热重分析等方法,揭示了纳米偏高岭土水泥砂浆性能变化机理。结果表明:纳米偏高岭土可以有效促进早龄期水泥水化,7 d龄期掺量为1%时的抗折、抗压强度分别较普通水泥砂浆增加10.38%和4.41%;掺量在1%~5%范围内,在干湿循环以及氯盐、硫酸盐侵蚀的耦合作用下,可以有效减轻有害离子对水泥砂浆的破坏,缓蚀效果明显;掺加纳米偏高岭土后水化产物生成量增多,填充了微裂缝及微孔,微观结构整体密实度提高。In order to improve the seawater corrosion resistance of traditional cement mortar,this study uses nano-metakaolin to improve the early-age physical and mechanical properties of cement mortar.Through simulated seawater tests,the appearance and bending/compressive strength changes of nano-metakaolin cement mortar at early age under the condition of dry and wet cycles are analyzed,and the scanning electron microscope and thermogravimetric analysis are combined to reveal the mechanism of performance variation.The results showed that nano-metakaolin can effectively promote hydration of cement at early age.With a 1%addition of nano-metakaolin,the flexural and compressive strengths at 7 days of age increased by 10.38%and 4.41%,respectively,compared to ordinary cement mortar.When the addition is in the range of 1%~5%,under the dry-wet cycle and the coupled effect of chloride and sulfate erosion,the nano-metakaolin can effectively reduce the damage of harmful ions to cement mortar,showing a clear the corrosion inhibition effect.Addition of nano-metakaolin increased the amount of hydration products,filled the micro-cracks and micro-pores,and improved the overall compactness of microstructures.

关 键 词：纳米偏高岭土 潮差区 氯盐 硫酸盐 

分 类 号：TB532.1[理学—物理] TB553[理学—声学]