火山灰凝灰岩有作为掺合料应用于西部地区水利工程建设的前景。采用扫描电子显微镜(SEM)、X射线衍射分析(XRD)和X射线荧光分析(XRF)等手段,研究了粉磨作用对凝灰岩物理性能、化学成分和物相组成的影响,分析了凝灰岩活性指数与粉磨时间、养护龄期的相关关系。结果表明:凝灰岩细度随粉磨时间的延长而减小,但密度、烧失量和需水量比则略有增加。粉磨过程伴随有机械力化学作用,可对凝灰岩发挥物理活化的效果,但对凝灰岩的化学成分、元素分布和物相组成没有影响。凝灰岩活性指数与粉磨时间、养护龄期之间均呈对数关系。建议掺用凝灰岩时复配粉煤灰、矿渣等其他掺合料。
Abstract
Pozzolanic tuff powder has a prospect to be used as a new mineral admixture in hydraulic concrete preparation in China's western areas. By using scanning electron microscopic (SEM), X-ray diffraction (XRD) analysis and X-ray fluorometric (XRF) analysis, the influences of grinding process on physical properties, chemical composition and mineral phase components of tuff powder were examined. The relations of activation index of tuff against grinding time and curing age were also investigated. Results manifest that the fineness of tuff powder reduces with the prolongation of grinding period, while density, loss of ignition (LOI) and the ratio of water demand all increase slightly. The grinding process is accompanied by mechanochemical action, which could exert physical activation effect on tuff powder, but has no effect on chemical composition, element distribution and mineral phase component. The activation index of tuff powder is in a notable logarithm relationship with grinding period and curing age. We recommend that tuff powder should be incorporated in concrete accompanied by some other mineral admixtures such as fly ash and slag.
关键词
凝灰岩 /
活性指数 /
粉磨作用 /
物理活化 /
SEM /
XRD /
细度
Key words
tuff /
activity index /
grinding process /
physical activation /
SEM /
XRD /
fineness
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基金
国家重点研发计划课题项目(2019YFC1510803);国家自然科学基金项目(U2040222);中央级公益性科研院所基本科研业务费项目(CKSF2021456/CL)
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