| 纳米SiO2改性聚合物水泥基复合材料早期微观结构及性能 |
| |
| 引用本文： | 李刊,魏智强,乔宏霞,路承功,黄尚攀,杨博. 纳米SiO2改性聚合物水泥基复合材料早期微观结构及性能[J]. 复合材料学报, 2020, 37(9): 2272-2284. DOI: 10.13801/j.cnki.fhclxb.20200218.002 |
| |
| 作者姓名： | 李刊 魏智强 乔宏霞 路承功 黄尚攀 杨博 |
| |
| 作者单位： | 1.兰州理工大学 土木工程学院，兰州 730050 |
| |
| 基金项目： | 国家自然科学基金(51868044)；硅酸盐建筑材料国家重点实验室(武汉理工大学)开放基金(SYSJJ2018-20)；兰州理工大学红柳一流学科建设计划 |
| |
| 摘 要： | 利用纳米SiO2(nano SiO2)早期可促进聚合物水泥基复合材料水化速率、提升其力学性能、改善其界面过渡区(ITZ)性能及优化其孔隙结构等特点，借助XRD、SEM、EDS、显微硬度(MH)及压汞(MIP)等试验，揭示了nano SiO2对聚合物水泥基复合材料早期性能影响的微观机制。结果表明:当nano SiO2掺量为2wt%时，聚合物水泥基复合材料的力学性能最优，3 d和7 d龄期抗压强度分别为57.5 MPa和67.3 MPa，较仅仅掺加聚合物的水泥基复合材料分别提高了12.7%和13.9%；nano SiO2的掺入改变了聚合物水泥基复合材料水化产物数量及微观形貌。对于ITZ性能，nano SiO2掺入后，聚合物水泥硬化浆体-骨料的ITZ厚度减小，形貌变得更加致密；ITZ的钙硅比因nano SiO2的加入变小而其显微硬度变大；此外，nano SiO2加入后可以进一步填充聚合物水泥基复合材料更加细小的孔隙，使其凝胶孔比例变高，最可几孔径变小，大大优化了聚合物水泥基复合材料的孔隙结构。
|
| 关 键 词： | 纳米SiO2 聚合物水泥基复合材料 微观结构 界面过渡区 力学性能 |
| 收稿时间： | 2019-10-23 |
Microstructure and properties of polymer cement-based composites modified by nano SiO2 in early age |
| |
| Affiliation: | 1.School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China2.State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China3.Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou University of Technology, Lanzhou 730050, China |
| |
| Abstract: | Owing to the addition of nano SiO2 can promote the hydration rate, improve the mechanical properties and interfacial transition zone (ITZ) and refine the pore structure of polymer cement-based composites, the microscopic mechanism of influence of nano SiO2 on the early properties of polymer cement-based composites was revealed by means of XRD, SEM, EDS, microhardness (MH) and mercury intrusion porosimetry (MIP) experiments. The results show that when nano SiO2 content is 2wt%, the mechanical properties of the polymer cement-based composites are the best. The compressive strength is 57.5 MPa and 67.3 MPa in 3 d and 7 d age, respectively, which is 12.7% and 13.9% higher than that of the polymer cement-based composites with polymer simply. The addition of nano SiO2 changes the hydration products and microstructure of the polymer cement-based composites. As for ITZ, the thickness of ITZ between polymer cement hardened paste and aggregate decreases, its morphology becomes denser, the calcium-silicate ratio in ITZ declines and the microhardness in ITZ increases by nano SiO2 incorporation. Since nano SiO2 can further fill finer pores of the polymer cement-based composites, there is higher proportion of gel pores and the mean pore diameter tends to be smaller so that the pore structure of the polymer cement-based composites is greatly optimized by nano SiO2 addition. |
| |
| Keywords: | |
|
| 点击此处可从《复合材料学报》浏览原始摘要信息 |
|
点击此处可从《复合材料学报》下载免费的PDF全文 |
|
