α和γ型纳米Al_2O_3对水泥基材料性能的影响

Effect of α and γ type nano-Al_2O_3 on cement base material properties

为了探究α型和γ型纳米Al_2O_3对水泥基材料的改性作用,采用细度为30 nm的α型和γ型纳米Al_2O_3、尧柏水泥、标准砂和聚羧酸减水剂制备水泥基材料,探析α型和γ型纳米Al_2O_3对水泥基材料的凝结时间、力学性能和收缩性能的影响,并分析其作用机理。结果表明:α型和γ型纳米Al_2O_3均会降低水泥基材料的凝结时间,提高水泥基材料的抗折强度和抗压强度,降低水泥基材料的干燥收缩,但γ型纳米Al_2O_3对水泥基材料的改性作用低于α型纳米Al_2O_3。综合本文和文献分析发现,纳米Al_2O_3在水泥基材料中发挥着尺寸效应、填充效应和表面效应,从而达到改性水泥基材料的力学性能和耐久性。

In order to understand the modification effects ofαandγtype nano-Al2O3 on the cement base material,the 30 nmαandγtype nano-Al2O3,Yaobai cement,standard sand and carboxylic acid water reducing agent were used to make cement base materials,the setting time,mechanical properties and shrinkage performance and their mechanism were analyzed.The results showed that:The setting time of cement base material can be reduced,the flexural strength and compressive strength of cement base material can be improved,and the drying shrinkage of cement-based materials can be reduced when nanoAl2O3 ofαandγtype replace cement.But the modification effect ofαtype nano-Al2O3 on cement base material is lower than theγtype.Based on the analysis of this article and literature review,we found that nano-Al2O3 ofαandγtype in cement base material plays the roles of size effect,filling effect and surface effect,which will achieve the ideas that modified mechanical properties and durability of cement base material.