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纳米SiO2/Al2O3对混凝土力学性能和抗盐冻性能影响试验研究

作者：姜华1，吕贝贝2

关键字：纳米,SiO2,Al2O3,对,混凝土,力学性能,和,抗盐,

　
（1.大同煤炭职业技术学院 建筑工程系，山西 大同  037024；
2.山西大同大学 建筑与测绘工程学院，山西 大同  037009）
    摘要：研究了纳米材料类型、掺量及养护龄期等对混凝土力学性能和抗盐冻性能的影响。结果表明，纳米SiO2/Al2O3对混凝土力学性能具有良好的改善作用，随其掺量的增加，混凝土的抗压和抗折强度均呈提高的趋势，且对混凝土早期强度的改善更具优势。其中，纳米Al2O3对抗压强度改善效果最好，纳米SiO2对抗折强度改善效果最好；单掺纳米SiO2/Al2O3的混凝土力学性能均优于复掺粉煤灰的混凝土。NaCl盐冻循环试验表明，纳米SiO2和Al2O3均能有效提高混凝土的抗盐冻性能，且随其掺量的增加，相对动弹性模量增大、质量损失率减小。纳米SiO2对混凝土抗盐冻性能的改善效果最佳。
    关键词：混凝土；纳米SiO2；纳米Al2O3；力学性能；盐冻性能
    中图分类号：TU528.043        文献标识码：A        文章编号：1001-702X（2020）10-0044-04
 
Experimental study on the impacts of nano-SiO2/Al2O3 on mechanical properties and deicing salt of concrete
JIANG Hua1，LV Beibei2
（1.Department of Architecture and Civil Engineering，Datong Vocational and Technical College of Coal，Datong 037024，China
2.School of Architecture and Geomatics Engineering，Shanxi Datong University，Datong 037009，China）
    Abstract：The effects of nano-material type，content and curing age on mechanical properties and salt-freezing resistance of concrete were studied. The results show nano-SiO2/Al2O3 has improvement effect on the mechanical properties of concrete. With the increase of adding amount，its compressive strength and tensile strength were increased，and the improvement of the early strength of concrete has more advantages. Among them，the nano-Al2O3 has the best effect on the improvement of compressive strength，nano-SiO2 has the best effect on the improvement of the tensile strength. Fly ash has certain degradation effect on the mechanical properties of concrete，the mechanical properties of concrete doped with nano-SiO2/Al2O3 are better than that composite doped with fly ash. NaCl salt frozen cycling test shows nano-SiO2/Al2O3 can effectively improve the frost resistance of concrete，and with the increase of the content，the relative dynamic elastic modulus index showed a trend of increase，mass loss index rate have been in decline. Nano-SiO2 has the best improvement effect to the salt scaling resistance performance.
    Key words：concrete，nano-SiO2，nano-Al2O3，mechanical properties，salt freezing performance