The effect of SiO2 nanoparticles derived from hydrothermal solutions on the performance of portland cement based materials
The effect of SiO2 nanoparticles derived from hydrothermal solutions on the performance of portland cement based materials
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DOI：
10.1007/s11709-017-0438-2
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发表时间：
2017-12-01
影响因子：
3
通讯作者：
Sobolev, Konstantin
中科院分区：
文献类型：
--
作者：
Flores-Vivian, Ismael;Pradoto, Rani G. K.;Sobolev, Konstantin
SiO2纳米颗粒用于水泥体系中可以改善水泥体系的流变性能，提高辅助胶凝材料的反应活性，提高水泥的强度和耐久性。在这项研究中，低成本的纳米SiO2颗粒从天然水热溶液中获得的膜超滤，并可选地，通过低温化学真空升华干燥，在波特兰水泥为基础的系统进行了评估。富含SiO2的解决方案，从威尔斯的Mutnovsky地热发电站（俄罗斯远东）。使用0.25%的恒定纳米SiO2剂量（作为固体材料，按胶凝材料的重量计）来将具有不同纳米颗粒的水泥系统与参考砂浆和市售纳米SiO2进行比较。采用X射线衍射（XRD）、比表面积、扫描电镜（SEM）和傅里叶变换红外光谱（FTIR）等技术对纳米粒子进行了表征。结果表明，聚羧酸醚高效减水剂的添加和使用超声波处理器的分散处理可以用来促进纳米SiO2颗粒在混合水中的分布。研究了纳米SiO2颗粒对波特兰水泥砂浆流动性、水化热和抗压强度的影响。结果表明，纳米SiO2颗粒的使用可以减少偏析，提高强度性能。
The nanoparticles of SiO2 were used in cement systems to modify the rheological behavior, to enhance the reactivity of supplementary cementitious materials, and also to improve the strength and durability. In this research, low-cost nano-SiO2 particles from natural hydrothermal solutions obtained by membrane ultrafiltration and, optionally, by cryochemical vacuum sublimation drying, were evaluated in portland cement based systems.The SiO2-rich solutions were obtained from the wells of Mutnovsky geothermal power station (Far East of Russia). The constant nano-SiO2 dosage of 0.25% (as a solid material by weight of cementitious materials) was used to compare the cement systems with different nanoparticles against a reference mortar and a commercially available nano-SiO2. Nanoparticles were characterized by X-Ray Diffraction (XRD), BET Surface Area, Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FTIR) spectroscopy techniques. It was demonstrated that the addition of polycarboxylate ether superplasticizer and the dispersion treatment using an ultrasound processor can be used to facilitate the distribution of nano-SiO2 particles in the mixing water. The effect of nano-SiO2 particles in portland cement mortars was investigated by evaluating the flow, heat of hydration and compressive strength development. It was demonstrated that the use of nano-SiO2 particles can reduce the segregation and improve strength properties.