热激发张家口尚义页岩的火山灰活性研究  

Research on the Pozzolanic Activity of Shangyi Shale in Zhangjiakou by Thermal Excitation

作　　者：元敬顺[1] 孙婧[1] 岳丽娇[1] 闫杰[1] 

机构地区：[1]河北建筑工程学院,张家口075000

出　　处：《硅酸盐通报》2013年第3期476-481,485,共7页Bulletin of the Chinese Ceramic Society

摘　　要：利用水泥胶砂强度比和火山灰活性试验法,对经750～900℃、保温时间60～150 min煅烧处理的页岩火山灰活性进行了评定;结果表明:经煅烧处理后的页岩均具有活性,活性最高的是经过850℃,120 min煅烧处理的页岩,火山灰活性指数达到99.6%;而过高的煅烧温度和时间(温度高于900℃时间大于90 min)会导致活性急剧下降。通过XRD测试手段,对页岩获得火山灰活性的机理进行了分析,分析发现当煅烧温度高于750℃后,页岩中的粘土矿物高岭石衍射峰消失,碳酸盐矿物白云石衍射峰消失,出现碳酸钙和方镁石衍射峰,温度为850℃后碳酸钙衍射峰消失,随着温度提高伊利石衍射峰变弱,而烧页岩获得较高活性正是源于页岩中一些矿物的脱水和分解。Taking advantage of methods of cement mortar strength ratio and the test method of pozzolanic activity, the shale pozzolanic activity can be evaluated by calcined treatment with condition of 750- 900 ℃ and 60 - 150 min＇s soaking; The result shows that all the calcined shale possesses activity and the shale which treated with 850 ℃ and 120 min＇ s soaking has the highest activity and the pozzolanic activity index reaches to 99.6% ; while over high calcined temperature and soaking time （ above 900 ℃ and 90 min） will lead to the sharp decline of activity. By means of X-Ray Diffraction test, we analyzed the mechanism of shale acquiring pozzolanic activity. It is found that, in the analysis, when the calcined temperature is higher than 750 ℃, the clay mineral kaolinite diffraction peak and carbonate mineral dolomite diffraction peak in shale will both disappear, while the calcium carbonate and periclase diffraction peak will appear; when the calcined temperature is higher than 850 ℃, the calcium carbonate diffraction peak will disappear, and illite diffraction peak will be weaken with the gradual increase of temperature, and the reason why burnt shale can acquire higher activity is the dehydration and disintegration of mineral in shale.

关 键 词：烧页岩 抗压强度比 强度对比试验 火山灰性试验 活性机理 

分 类 号：TQ172[化学工程—水泥工业]