摘要
为了研究青稞秸秆灰(HBSA)掺入氯氧镁水泥(MOC)中的活性与作用机理,对不同煅烧温度、煅烧时间以及研磨时间所制备的HBSA的物相组成及粒径分布进行了测试,初步确定了HBSA的活性制备参数。设计了煅烧温度、煅烧时间、研磨时间3种参数影响下MOC的力学性能正交试验,并采用相对活性指数反映掺入MOC中HBSA的活性高低。基于灰熵关联分析,对HBSA活性影响因素的主次关系进行了分析。最后,对HBSA的微观组成以及MOC的微观形貌进行分析,进而揭示其活性效应产生的机理。结果表明,600℃时煅烧2 h、研磨2 h所得HBSA的结晶度和平均粒径最小、比表面积最大、活性最高,掺入MOCM中相对活性指数达到1.06。煅烧温度对HBSA的活性影响最大,研磨时间影响次之,煅烧时间影响最小。HBSA中活性SiO_(2)的含量较高,能够与MOC的水化产物发生二次水化反应生成水化硅酸镁(M-S-H)凝胶,增强结构的密实性,提高力学性能。
In order to study the activity and action mechanism of highland barley straw ash(HBSA)mixed with magnesium oxychloride cement(MOC),the microstructure and particle size distribution of HBSA prepared at different calcination temperature, calcination time and grinding time are tested, and the activity preparation conditions of HBSA are preliminarily determined. The orthogonal test of mechanical properties of MOC under the influence of calcination temperature, calcination time and grinding time is designed, and the relative activity index is used to reflect the activity of HBSA incorporated into MOC. Based on grey entropy correlation analysis, the primary and secondary relationship of influencing factors on HBSA activity is analyzed. Finally, the microstructure of HBSA and the morphology of MOC are analyzed to reveal the mechanism of its activity effect. The results show that the crystallinity and average particle size of HBSA obtained by calcination for 2 h and grinding for 2 h at 600 ℃ are the smallest, the specific surface area is the largest and the activity is the highest. The relative activity index added into MOC is 1.06. Calcination temperature has the greatest influence on the activity of HBSA, followed by grinding time and calcination time. The content of active SiO_(2) in HBSA is relatively high, which can react with MOC hydration products for two times to generate more water to produce magnesium silicate (M-S-H) gel, enhance the compactness of structure and improve the mechanical properties.
作者
曹锋
谭镇
乔宏霞
舒修远
CAO Feng;TAN Zhen;QIAO Hongxia;SHU Xiuyuan(School of civil and transportation engineering,Qinghai Minzu University,Xining 810000,China;School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《功能材料》
CAS
CSCD
北大核心
2021年第12期12196-12202,12209,共8页
Journal of Functional Materials
基金
国家自然科学基金项目(51868044)。
关键词
青稞秸秆灰
氯氧镁水泥
活性效应
微观结构
灰熵关联分析
作用机理
highland barley straw ash
magnesium oxychloride cement
active effect
microstructure
grey entropy correlation analysis
mechanism
