摘要
将纳米氮化硅粉体按不同比例掺入到水泥中,对其进行改性的研究。探讨其对水泥综合物理力学性能及耐腐蚀性的影响,采用SEM对改性水泥的水化产物形貌进行测试,并对改性机理进行了初步研究。试验结果表明:纳米Si3N4粉体对水泥净浆和胶砂的28 d改性最佳掺量均为6%。此时,水化1 d3、d、7 d和28 d的净浆,其抗压强度分别较空白样提高了75.0%,40%4,9.0%和22.9%;胶砂的抗压强度分别较空白样提高了68.6%1,04.6%9,9.4%,33.0%,抗折强度分别提高了42.9%8,6.1%,22.1%3,.8%。纳米Si3N4粉体的掺入提高了水泥的耐腐蚀性能。
Portland cement was modified by adding different content of Silicon nitride nanopowders. The in- fluence of the physic-mechanical properties and corrosion resistance of modified cement were studied systemati- cally. The hydration and morphology of the nanopowders modified cement were determined by SEM and XRD, and the modified mechanism is discussed. The results show that the best content of Silicon nitride nanopowders used to modify the performance of cement and mortar is 6%. With this ratio, compared with those of non-modi- fied cement, the compressive strength of cement at the age of 1 d, 3 d, 7 d and 28 d is increased by 75.0% , 40%, 49.0% and 22.9% respectively, while the compressive strength of mortar is increased by 68.6% , 104. 6% , 99.4% , and 33.0% and flexural strength increased by 42.9% , 86.1%, 22.1% and 3.8%. Silicon nitride nanopowders can also improve the corrosion resistance of the cement.
出处
《石家庄铁道大学学报（自然科学版）》
2011年第4期105-108,共4页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
关键词
硅酸盐水泥
纳米Si3N4粉体
力学性能
耐腐蚀性
portland cement
silicon nitride nanopowders
mechanical properties
corrosion resistance
