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Effects of nano-TiO2 on strength, shrinkage and microstructure of alkali activated slag pastes

机译:纳米二氧化钛对碱活化矿渣浆的强度,收缩率和微观结构的影响

摘要

For alkali-activated slag (AAS), high drying shrinkage is an obstacle which impedes its application as a construction material. In this investigation, nano-TiO2 was added to AAS, and its mechanical properties and shrinkage were tested to examine its effect on hardened alkali-activated slag paste (AASP). To understand the impact of nano-TiO2 on AASP at micro scale, FTIR, MIP and SEM were carried out. Experimental results indicate that the addition of nano-TiO2 to AAS enhances the mechanical strength, and decreases the shrinkage of AASP. FTIR and SEM results demonstrated that the addition of nano-TiO2 into the AASP accelerates its hydration process, resulting in more hydration products and denser structure. MIP results showed that the addition of nano-TiO2 reduces the total porosity of AASP and changes the pore structure. The porosity of 1.25-25 nm mesopores, which is believed to be responsible for the high shrinkage of AASP, is remarkably reduced due to the addition of nano-TiO2.
机译:对于碱活化矿渣(AAS),高的干燥收缩率是一个障碍,阻碍了其作为建筑材料的应用。在这项研究中,将纳米二氧化钛添加到了AAS中,并对其机械性能和收缩率进行了测试,以检验其对硬化碱活化矿渣糊(AASP)的影响。为了从微观角度了解纳米TiO2对AASP的影响,进行了FTIR,MIP和SEM。实验结果表明,向AAS中添加纳米TiO2可以提高机械强度,并减少AASP的收缩。 FTIR和SEM结果表明,向AASP中添加纳米TiO2可加速其水合过程,从而产生更多的水合产物和更致密的结构。 MIP结果表明,纳米TiO2的加入降低了AASP的总孔隙率并改变了孔结构。 1.25-25 nm中孔的孔隙率被认为是造成AASP高收缩的原因,由于添加了纳米TiO2,其孔隙率显着降低。

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