摘要
废弃的镍矿渣与水泥、石灰等按一定比例混掺,通过水热合成的方法可制备出镍矿渣加气混凝土。研究了钙硅比对镍矿渣加气混凝土力学性能的影响及其机理,对镍矿渣加气混凝土进行了XRD、FT-IR、SEM微观测试。结果表明:随着钙硅比的降低,镍矿渣加气混凝土的干密度逐渐增加,强度先增大后减小,钙硅比为0.65时达到峰值;托勃莫来石和硬石膏的X射线衍射峰逐渐增强;红外图谱中硅氧四面体及含硅基团的聚合程度增加;水化产物的形貌由针棒状结构向片状结构过渡。
Waste nickel slag and cement,lime,etc.was mixed according to a certain proportion to prepare nickel slag autoclaved aerated concrete by hydrothermal synthesis method.Influence of calcium-silicon ratio on macroscopic and microscopic properties of nickel slag aerated concrete were researched.Structure and morphology characteristic of aerated concrete samples were analyzed by XRD,FT-IR and SEM.Results show that with the decrease of calcium-silicon ratio,dry density of nickel slag aerated concrete is reduced continuously while compressive and flexural strength first increases and then decreases,it reaches a peak strength when the calcium-silicon ratio is 0.65.X-ray diffraction peak of tobermorite and anhydrite are gradually strengthened;Infrared spectrum of silicon-oxygen tetrahedron and the degree of polymerization of silicon-based groups are increased.Morphology of hydration products transfered from lamellar structure to the rod-like structure steadily.
出处
《材料导报》
EI
CAS
CSCD
北大核心
2016年第10期126-129,134,共5页
Materials Reports
基金
国家自然科学基金(51572234)
关键词
钙硅比
镍矿渣
加气混凝土砌块
固废资源化
calcium silicon ratio
nickel slag
aerated concrete block
utilization of solid waste
