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首页> 外文期刊>Materials Science and Engineering >The effects of TiO_2 nanoparticles on physical, thermal and mechanical properties of concrete using ground granulated blast furnace slag as binder;
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The effects of TiO_2 nanoparticles on physical, thermal and mechanical properties of concrete using ground granulated blast furnace slag as binder;

机译：以磨碎的高炉矿渣为粘结剂的TiO_2纳米颗粒对混凝土物理，热和力学性能的影响；

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摘要

In the present study, flexural strength, pore structure, thermal behavior and microstructure characteristics of concrete containing ground granulated blast furnace slag and TiO_2 nanoparticles as binder have been investigated. Portland cement was replaced by different amounts of ground granulated blast furnace slag and the properties of concrete specimens were investigated. Although it negatively impacts the properties of concrete at early ages, ground granulated blast furnace slag was found to improve the physical and mechanical properties of concrete up to 45 wt% at later ages. TiO_2 nanoparticles with the average particle size of 15nm were partially added to concrete with the optimum content of ground granulated blast furnace slag and physical and mechanical properties of the specimens were measured. TiO_2 nanoparticle as a partial replacement of cement up to 3 wt% could accelerate C-S-H gel formation as a result of increased crystalline Ca(OH)_2 amount at the early age of hydration and hence increase flexural strength of concrete. The increased the TiO_2 nanoparticles' content more than 3 wt%, causes the reduced the flexural strength because of the decreased crystalline Ca(OH)_2 content required for C-S-H gel formation and unsuitable dispersed nanoparticles in the concrete matrix. TiO_2 nanoparticles could improve the pore structure of concrete and shift the distributed pores to harmless and few-harm pores.
机译：在本研究中，研究了含有磨碎的高炉矿渣和TiO_2纳米颗粒作为粘结剂的混凝土的抗弯强度，孔结构，热行为和微观结构特征。用不同量的高炉矿渣代替波特兰水泥，并研究了混凝土试样的性能。尽管它对早期的混凝土性能产生负面影响，但发现粒状高炉矿渣可改善混凝土的物理和机械性能，在后期则可达到45 wt％。将平均粒径为15nm的TiO_2纳米颗粒部分添加到混凝土中，并以最适量的粒状高炉矿渣为原料，并测量样品的物理和机械性能。 TiO_2纳米颗粒作为水泥的部分替代品，其含量高达3 wt％可以加速C-S-H凝胶的形成，这是由于在水合作用早期增加了结晶Ca（OH）_2的含量，从而提高了混凝土的抗弯强度。 TiO_2纳米粒子含量的增加超过3 wt％，导致弯曲强度降低，这是因为C-S-H凝胶形成所需的结晶Ca（OH）_2含量降低，以及纳米粒子在混凝土基质中的不适当分散。 TiO_2纳米粒子可以改善混凝土的孔结构，将分布的孔转变为无害和无害孔。

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