采用手工搅拌、机械搅拌以及超声波作用对纳米SiO2进行分散处理,通过纳米粒度Zeta电位仪测定纳米SiO2胶体粒径及粒径分布,研究了纳米SiO2的分散性及其对水泥胶砂强度和毛细吸水的影响.研究结果表明,比较三种分散效果,超声波作用最好,机械搅拌次之,手工搅拌最差;增加超声波作用时间,纳米SiO2胶体平均粒径降低,分散性提高,超声波作用超过10 min,纳米SiO2胶体小颗粒增多,但粒径分布曲线整体向大颗粒方向偏移,分散性提高不明显;水泥胶砂强度和毛细吸水性与纳米SiO2的分散性有关,随纳米SiO2分散性的提高,水泥胶砂强度增大,毛细吸水系数降低,胶砂试件的密实度提高.
Hand stirring, mechanical stirring and ultrasonic were used to disperse nano-SiO2.The nano-SiO2 dispersion was studied by measuring nano-SiO2 colloidal particle size and particle size distribution using Zeta potential analyzer and its effects on the strength and capillary water absorption of cement mortar were analyzed as well.The research results show that the dispersion effect of ultrasonic dispersion is the best among the three dispersion methods, the mechanical stirring is the second and the manual stirring is the worst.With the increase of ultrasonic time, the average particle diameter of nano-SiO2 colloid decreases, and dispersibility of nano-SiO2 increases.The time of ultrasonic is more than 10 min, small particles of nano-SiO2 colloid increase, but the particle size distribution curve shifts to the larger particles, resulting in no obvious improvement in dispersibility.The strength of cement mortar and capillary water absorption relate with the dispersibility of nano-SiO2.With the increase of nano-SiO2 dispersibility, strength of cement mortar increases, capillary water absorption coefficient decreases,and density of mortar is improved.
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