偏高岭土活性研究进展

偏高岭土作为一种火山灰材料，由于煅烧过程中消耗能源低、环境污染小，并且制成混合水泥可改善波特兰水泥的某些性能，如强度和耐久性等，是一种优异的水泥替代材料。近年来很多学者致力于研究偏高岭土的火山灰活性，本文概述了高岭土的最优煅烧温度和时间，影响活性的因素以及检测高岭土性能和偏高岭土活性的方法。前人研究表明高岭土最优煅烧温度和时间受矿物组成、结晶度以及高岭土含量等因素影响，其中高岭土结构的结晶度对其煅烧后活性影响最大。采用XRD、TG-DTA和IR等方法分析原矿性能，通过弗兰蒂尼测试、电导率测试和强度活性指数等方法测定偏高岭土活性，最为准确的方法是弗兰蒂尼和强度活性指数测试两种方法。

Research Progress on Activity of Metakaolin

Metakaolin as a pozzolanic activity material is an excellent substituted cement material since it cause less energy consumption and environment pollution during calcining and can improve some properties of Portland cement such as strength and durability when it is blended in cement. In recent years, many researchers devoted themselves to research the pozzolanic of metakaolin. In this paper, the optimum calcination temperature and time, the influence factors on the activity and the methods that test kaolin properties and metakaolin activity were summarized. According to the predecessors ' research results, the optimum calcination temperature and time are affectd by the mineralogy composition, crystallite and kaolinite content , among which the most prominent influence factor on the calcined kaolin 's activity is the crystallite. The kaolin's properties can be analyzed by the methods including XRD, TG-DTA and IR. The metakaolin 's properties can be analyzed by the Frattni, Chapelle, the electrical conductivity and the strength activity index test, among which the most accurate test methods are the Frattni and strength activity index test.