粉磨稻壳灰的颗粒特征和团聚现象试验研究

发布时间：2018-05-18 07:11

本文选题：稻壳灰 + 粉磨　；参考：《混凝土》2017年09期

【摘要】：稻壳灰的颗粒粒径对其火山灰活性和稻壳灰混凝土的性能影响显著。为获得粉磨稻壳灰的颗粒特征变化规律,开展了不同粉磨时间、不同存放时间稻壳灰比表面积和粒径分布试验研究。研究结果表明:原状稻壳灰呈蜂窝状多孔结构,导致其具有超高活性;随着粉磨时间的增加,稻壳灰的比表面积非线性增大并趋于稳定,细颗粒逐渐增多,粗颗粒相应减少;稻壳灰的粉磨过程分为快速粉磨和缓慢粉磨阶段,中粒径D50在快速粉磨阶段迅速下降,而后缓缓降低直至平稳;稻壳灰粉磨后短期存放和长期存放均出现了颗粒团聚现象,短期存放较长期存放的团聚更为明显;粉磨过程引起的静电库仑力、范德华力和极大表面能是稻壳灰粉磨后颗粒团聚的诱因。
[Abstract]:The particle size of rice husk ash has a significant effect on its pozzolanic activity and the performance of rice husk ash concrete. The specific surface area and particle size distribution of rice husk ash with different grinding time and different storage time were studied in order to obtain the change rule of grain characteristics of rice husk ash. The results showed that the rice husk ash had high activity due to honeycomb porous structure, and with the increase of grinding time, the specific surface area of rice husk ash increased nonlinearly and tended to be stable, the fine particles gradually increased, and the coarse particles decreased accordingly. The grinding process of rice husk ash can be divided into two stages: fast grinding and slow grinding. The medium particle size D50 decreases rapidly at the rapid grinding stage, then decreases slowly until stable, and the particle agglomeration occurs in the short and long term storage of rice husk ash. The agglomeration in short term storage is more obvious than that in long term, and the electrostatic Coulomb force, van der Waals force and maximum surface energy caused by grinding process are the inducements for the agglomeration of rice husk ash after grinding.
【作者单位】：中国矿业大学深部岩土力学与地下工程国家重点实验室;淮阴工学院建筑工程学院;江苏金达混凝土有限公司;
【基金】：江苏省政策引导类计划(产学研合作)项目(BY2016061-12) 江苏省建设系统科技项目(2015ZD01);江苏省建设系统科技项目(2016ZD29) 国家级大学生创新训练项目(201611049007Z)
【分类号】：TU528

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