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Investigation of Pozzolanic Reaction in Nanosilica-Cement Blended Pastes Based on Solid-State Kinetic Models and 29Si MAS NMR

机译:基于固态动力学模型和29Si MAS NMR研究纳米二氧化硅-水泥共混浆料中的火山灰反应

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摘要

The incorporation of pozzolanic materials in concrete has many beneficial effects to enhance the mechanical properties of concrete. The calcium silicate hydrates in cement matrix of concrete increase by pozzolanic reaction of silicates and calcium hydroxide. The fine pozzolanic particles fill spaces between clinker grains, thereby resulting in a denser cement matrix and interfacial transition zone between cement matrix and aggregates; this lowers the permeability and increases the compressive strength of concrete. In this study, Ordinary Portland Cement (OPC) was mixed with 1% and 3% nanosilica by weight to produce cement pastes with water to binder ratio (w/b) of 0.45. The specimens were cured for 7 days. 29Si nuclear magnetic resonance (NMR) experiments are conducted and conversion fraction of nanosilica is extracted. The results are compared with a solid-state kinetic model. It seems that pozzolanic reaction of nanosilica depends on the concentration of calcium hydroxide.
机译:将火山灰材料掺入混凝土中具有许多有益的作用,以增强混凝土的机械性能。混凝土的水泥基质中的硅酸钙水合物通过硅酸盐与氢氧化钙的火山灰反应而增加。火山灰细颗粒填充了熟料晶粒之间的空隙,从而形成了致密的水泥基体和水泥基体与集料之间的界面过渡区。这降低了渗透性并提高了混凝土的抗压强度。在这项研究中,将普通硅酸盐水泥(OPC)与1%和3%的纳米二氧化硅混合以生产水与粘结剂之比(w / b)为0.45的水泥浆。样品固化7天。进行 29 Si核磁共振实验,提取纳米二氧化硅的转化率。将结果与固态动力学模型进行比较。似乎纳米二氧化硅的火山灰反应取决于氢氧化钙的浓度。

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