NS改性OPC-SAC二元胶凝体系力学和抗碳化性能研究
Study on the mechanical properties and carbonation resistance of NS modified OPC-SAC binary cementitious system
关键词：
纳米二氧化硅（NS）；OPC-SAC二元胶凝体系；力学性能；抗碳化性能；微观结构
Key words：
Nano silica(NS); Ordinary Portland cement-calcium sulfoaluminate cement(OPC-SAC) binary cementitious system; Mechanical property; Carbonation resistance; Microstructure
刊期：
2025年第6期
DOI：
10.19761/j.1000-4637.2025.06.012.07
文章编号：
基金项目：
作者：
杨顺秦1，余书亚2，王伟杰1
单位：
1.江苏绿和环境科技有限公司，江苏 常州 213100；2.西安建筑科技大学 土木工程学院， 陕西 西安 710055
摘要
摘 要：采用纳米二氧化硅（NS）改性普通硅酸盐水泥-硫铝酸盐水泥（OPC-SAC）二元胶凝体系，研究了NS掺量对修补砂浆力学和抗碳化性能的影响，并通过XRD、TG、MIP、SEM分析了影响机理。结果表明：掺入适量NS可以提高试件的力学及抗碳化性能；适量的NS填充了试件内部孔隙，且为水化产物的生成提供成核位点，促进胶凝材料的早期水化反应，生成了较多的AFt和凝胶物质，使微观结构更加致密，同时减少CO2的进入通道，从而改善试件的力学和抗碳化性能。
Abstract: The binary cementitious system of ordinary Portland cement-csulfoaluminate cement(OPC-SAC) modified by nano silica(NS) was used to investigate the effect of NS content on the mechanical properties and carbonation resistance of repair mortar. The influence mechanism was analyzed by XRD, TG, MIP, and SEM. The results indicate that the appropriate content of NS can improve the mechanical properties and carbonation resistance of the specimens. An appropriate content of NS can fill the internal pores of the specimen, provide nucleation sites for the generation of hydration products, promote the early hydration of cementitious materials, generate more AFt and gel materials, make the microstructure more compact, at the same time, reduce the entry channel of CO2, and improve the mechanical properties and carbonation resistance of the specimen.
结论
（1）随着NS掺量的增加，砂浆试件的抗折和抗压强度均呈先增加后降低的趋势，当NS掺量为0.8%时，试件各龄期的抗折、抗压强度均达到最高。
（2）随着NS掺量的增加，砂浆试件的碳化深度基本呈先降低后略微增加的趋势。
（3）随着碳化时间的延长，砂浆试件的抗折强度呈先增加后降低的趋势。相同碳化时间下，随着NS掺量的增加，试件的抗折强度呈先增加后降低的趋势。试件的抗压强度随着碳化时间的延长而增加。相同碳化时间下，随着NS掺量的增加，试件的抗压强度呈先增加后降低的趋势。掺入适量的NS可有效改善试件因碳化导致的力学性能劣化。
（4）当NS掺量为0.8%时，一方面，NS填充了试件内部的孔隙，使微观结构更加致密；另一方面，NS为水化产物的生成提供了更多的成核位点，促进了胶凝材料的早期水化，使晶体间的空间网状结构更加紧密，生成较多的AFt和凝胶物质能在碳化时反应生成CaCO3，有效填充孔隙，改善孔隙结构，减少CO2的进入通道，从而改善了试件的力学和抗碳化性能。
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引用本文
杨顺秦,余书亚,王伟杰.NS改性OPC-SAC二元胶凝体系力学和抗碳化性能研究[J].混凝土与水泥制品,2025(6):12-17,29.
YANG S Q,YU S Y,WANG W J.Study on the mechanical properties and carbonation resistance of NS modified OPC-SAC binary cementitious system[J].China Concrete and Cement Products,2025(6):12-17,29.
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