Department of Concrete, Building and Housing Research Center (BHRC), P.O. Box 13145-1696, Tehran, Iran.
Ultrason Sonochem. 2012 Jan;19(1):119-24. doi: 10.1016/j.ultsonch.2011.05.005. Epub 2011 May 8.
Natural pozzolans are appropriate supplementary cementitious materials in cement and concrete industry. A simple sonochemical method was developed to synthesize nanostructures of natural pozzolan. Chemical composition, crystallinity, morphology and reactivity of the natural pozzolan samples were compared before and after the sonochemical process, by using powder X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Thermal Gravimetry and Differential Thermal Analysis (TG/DTA). Compressive strength tests were performed to evaluate the properties of blended cements incorporating nano natural pozzolan. Under optimized conditions, the nano natural pozzolans showed a superior reactivity as compared with the bulk natural pozzolan. Also higher compressive strength was obtained for the cement specimen incorporating nano natural pozzolan.
天然火山灰是水泥和混凝土工业中合适的辅助胶凝材料。本研究采用简单的超声化学方法合成了纳米结构的天然火山灰。通过粉末 X 射线衍射（XRD）、扫描电子显微镜（SEM）、热重和差热分析（TG/DTA）比较了超声化学前后天然火山灰样品的化学组成、结晶度、形态和反应活性。抗压强度测试评估了掺入纳米天然火山灰的水泥的性能。在优化条件下，纳米天然火山灰的反应活性优于块状天然火山灰。同时，掺入纳米天然火山灰的水泥试块的抗压强度也更高。
