灵寿高岭土原矿在水泥基材料中的应用研究

对河北灵寿县高岭土原矿进行表征分析,包括X射线衍射和热重差热分析,并将其在程序实验炉内煅烧,煅烧温度设为550、650、750和850℃,煅烧时间为1、2和3h以制得活性偏高岭土.利用强度活性指数测试法确定各偏高岭土试样的活性,并分析其作为水泥替代材料的潜力.结果表明煅烧至650℃、3h制得的偏高岭土活性最高,替代20％水泥的砂浆28 d抗压强度可达到纯水泥砂浆强度的90％.

Application Research on Lingshou Kaolin Clay in Cement-based Materials

The characterization analysis on the kaolin clay originated from Lingshou country Hebei province was performed by the X ray diffraction (XRD),Thermogravimetric and differential thermal analysis(TG/DTA) method.Then they were calcined in a programmable laboratory furnace for producing pozzolanic metakaolin,which was heated from the ambinent temperature to 550,650,750 and 850 ℃ for 1,2 and 3 h respectively.The activity of a series of metakaolin were tested by strength activity index test method thus assessing the potential that they become substituted cement materials.The results show that the activity of metakaolin by heating kaolin clay at 650 ℃ and 3 h is most optimal,for instance,the 28 d compressive strength of cement motar with 20％ replacement of cement can attain 90％ of strength value of pure cement mortar.