Dispersion of CaCO3 nanoparticles by sonication and surfactant treatment for application in fly ash-cement systems
Dispersion of CaCO3 nanoparticles by sonication and surfactant treatment for application in fly ash-cement systems
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DOI：
10.1617/s11527-013-0110-9
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发表时间：
2014-06-01
影响因子：
3.8
通讯作者：
Shah, Surendra P.
中科院分区：
文献类型：
--
作者：
Kawashima, Shiho;Seo, Jung-Woo Ted;Shah, Surendra P.
本研究的目的是抵消粉煤灰的负面影响的早期性能的胶凝材料与碳酸钙（CaCO 3）纳米粒子的使用。主要的焦点是通过超声处理和使用表面活性剂来改善分散性，从而增强纳米颗粒的效果。制备具有各种表面活性剂类型和浓度的CaCO 3水性悬浮液，并使其经受不同的超声处理方案（不同的持续时间和振幅）。通过分光光度法比较其吸收光谱定量测量分散性和稳定性，并通过SEM成像定性评价。研究了超声处理纳米碳酸钙对粉煤灰-水泥浆体早期抗压强度的影响。优化了超声处理方案，并使用聚羧酸系高效减水剂实现了最有效的分散。良好的协议之间的色散测量和机械性能。
This research aims to offset the negative effects of fly ash on the early-age properties of cementitious materials with the use of calcium carbonate (CaCO3) nanoparticles. The main focus is to enhance the effect of the nanoparticles by improving dispersion through ultrasonication and use of surfactants. CaCO3 aqueous suspensions with various surfactant types and concentrations are prepared and subjected to different sonication protocols (varying duration and amplitude). Dispersion and stability are quantitatively measured by comparing their absorbance spectra through spectrophotometry and qualitatively evaluated through SEM imaging. The effectiveness of sonicated CaCO3 nanoparticle additions in accelerating setting and improving early-age compressive strength gain of fly ash-cement pastes is investigated. The sonication protocol is optimized and the most effective dispersion is achieved with polycarboxylate-based superplasticizer. Good agreement is found between the dispersion measurements and mechanical performance.