摘要
采用ICP-OES法,研究了煅烧条件对硅藻土火山灰活性的影响。运用XRD、FT-IR、SEM及EDS等表征方法,对煅烧过程中硅藻土的物相、结构、形貌变化及火山灰活性的作用机理进行了研究和探讨。结果表明：700~1100℃,硅藻土可基本保持多孔结构,仍含有适当数量的活性S i-OH,800℃煅烧硅藻土的火山灰活性最高;粘土矿物在700℃时脱去羟基水,继续升温使层状结构破坏,火山灰活性降低。800℃时保温1 h,可使火山灰活性成分含量由未煅烧时的22.15%提高到37.21%。硅藻土的火山灰活性变化的主要原因是高温作用下宏观孔道结构、表面结构和晶体结构变化综合作用的结果。
In this paper,the influence of calcined condition on the pozzolanic activity of diatomite was determined according to ICP-OES analysis.Phase transformation,microstructure of diatomite,and mechanism of pozzolanic activity during calcination were investigated using XRD,SEM,EDS and FT-IR methods.The results indicate that mircroporous structure and Si-OH cluster in diatomite favor the pozzolanic activity,especially when calcined at 800 ℃.Layered structure of clay minerals is destroyed as a result of removal of water,which leads to a lower pozzolanic activity.After being calcined at 800 ℃ for 1 h,the proportion of pozzolanic compositions increase from 22.15% to 37.21%.Marco-pore structure,surface structure and crystal structure of diatomite are changed in high temperature,resulting in the level of pozzolanic activity.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2011年第1期19-24,49,共7页
Bulletin of the Chinese Ceramic Society
基金
教育部新世纪优秀人才支持计划资助(NCET-08-0828)
矿物岩石材料国家专业实验室开放课题(08A002)
关键词
硅藻土
火山灰活性
煅烧
物相
结构
diatomite
pozzolanic activity
calcination
mineral phase
structure
