作　　者： (李阳）; (陈杰）; (王飞）; (王旭阳）;

机构地区： 陕西铁路工程职业技术学院,陕西渭南714000

出　　处： 《混凝土》 2017年第8期116-119,共4页

摘　　要： 采用醇盐水解法制备二氧化硅纳米粉体添加于水泥砂浆中研究其力学性能,借助XRD和SEM分别对纳米粉体和混凝土的物相结构和微观形貌进行表征,利用抗折试验机和抗压试验机研究混凝土的力学性能。研究结果表明,醇盐水解法可以制得晶粒尺寸约为70~150 nm且结晶度良好的SiO_2纳米粉体。利用制备的SiO_2纳米粉体掺杂水泥砂浆的试验发现,当等量掺杂量为4%(相对于水泥质量的百分比)时,不同龄期混凝土的抗折强度和抗压强度都能达到最大,其中养护28 d混凝土的抗折强度为8.1 MPa,抗压强度为53 MPa。 Silica nano-powders （SiO2） prepared by alkoxide hydrolysis method are doped in cement mortar to research mechanical properties of concrete,the crystalline phases and microscopic morphology of powder and concrete are characterized by XRD and scanning electron microscopy （SEM）, respectively.The flexural experiment machine and compressive experiment machine are used to study the mechanical properties of concrete.The results show that silica nano-powders with a diameter of 70~150 nm and good crystallinity are prepared by alkoxide hydrolysis method.The experiences of cement mortar doped with SiO2 nano-powder have found that the different age the flexural strength and compressive strength of concrete can reach to the maximum when the equal dosage is 4% （relating to the percentage of cement quality）, flexural strength is 8.1 MPa and the compressive strength reaches 53 MPa when the curing age is 28 day.

关 键 词： 纳米二氧化硅 醇盐水解法 水泥砂浆 力学性能