通过力学强度、SEM、XRD 和 MIP 测试手段,研究了NT对水泥砂浆机械性能与微观结构的影响.结果表明,3％ NT可显著提高水泥砂浆的抗拉和抗折强度,28 d 时相比空白样分别提高了68．2％和63．2％；促进AFt的结晶析出,其含量较空白样提高了62．6％,并与水泥砂浆的抗拉和抗折强度呈现明显的正向关系；使28 d 时硬化浆体内部孔隙率降低了37．0％,无害孔增加了41．0％,有害孔降低了37．9％,即孔结构明显细化并向无害孔转移.研究结果说明了3％NT 可明显改善水泥砂浆韧性与密实度,并提出了NT对水泥水化晶体的形成具有模板成核作用和调控晶体生长效应.
The influences of nano-TiO2 (NT)on microstructures and mechanical properties of cement mortars were studied by strength test,scanning electron microscope (SEM),X-ray diffraction (XRD)and mercury in-trusion porosimetry (MIP ).Results show that,3% NT can significantly improve the tensile and flexural strengths,which increase by 68.2% and 63.2% at 28 days respectively compared those without NT.And it also promotes the precipitation of AFt crystals,which increase by 62.6%.The tensile and flexural strengths have significant positive correlation to the formation amount of AFt.The internal porosity,and harmful pore of hard-ened mortars at 28 d decrease by 37.0% and 37.9% respectively,while the harmless pores increase by 41.0%, namely pores of mortars are significantly refined and shift to harmless pores.The result of research indicates that 3% NT can effectively improve the toughness and compactness of mortars,and the template nucleation effect and crystal growth regulation effects of NT on the formation of hydration products are presented.
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