摘要
为提高机制砂石粉的利用率,在分析花岗岩机制砂石粉(以下简称石粉)掺量和细度对砂浆强度影响规律的基础上,采用灰关联熵分析法研究石粉细度对砂浆强度影响的显著性,并采用SEM分析方法研究石粉对砂浆微观性能的影响.研究表明:随着石粉掺量的增加,砂浆强度呈现先上升后下降的规律.随着石粉的粉磨时间增加,石粉比表面积增大,表现为粒径小于10μm颗粒含量的增加和大于40μm颗粒含量的减小.灰熵结果分析表明,石粉的颗粒参数及分布对砂浆强度均有一定的影响,其中比表面积对砂浆强度的影响最为显著,是影响石粉活性的显著因子.10~40μm的石粉颗粒对砂浆强度的提高是最为有益的.微观分析结果表明,合适掺量及细度的石粉通过改善胶凝体系内部水化产物数量及形貌进而影响砂浆宏观力学性能.
In order to improve the utilization rate of mechanism sand powder,based on the analysis of the mechanism of granite sand powder(hereinafter referred to as stone),the influence of fineness and dosage of particle characteristics on mortar strength,the significant impact of stone powder fineness on mortar strength was investigated employing the grey relational entropy analysis method.Additionally,the effects of limestone on the micro-properties of mortar were analyzed using scanning electron microscopy(SEM)analysis method.The results showed that the strength of mortar increases first and then decreases with the increase of stone powder content.With the increase of grinding time of stone powder,the specific surface area of stone powder is increased,which is characterized by an increase in particle content with a size of less than 10μm and a decrease in particle content with a size of greater than 40μm.The analysis of ash entropy results showed that the particle parameters and particle distribution of stone powder have a certain influence on mortar strength,among which the specific surface area has the most significant effect on mortar strength,which is a significant factor affecting the activity of stone powder.The stone powder in the range of 10~40μm prove to be the most beneficial for improving the strength of mortar.The results of microscopic analysis showed that the appropriate amount and fineness of stone powder can improve the quantity and morphology of hydration products in the cementitious system,thereby affecting the macroscopic mechanical properties of mortar.
作者
张云升
胡向楠
薛翠真
ZHANG Yun-sheng;HU Xiang-nan;XUE Cui-zhen(School of Civil Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China)
出处
《兰州理工大学学报》
CAS
北大核心
2023年第6期16-21,共6页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(U21A20150,52108219),甘肃省交通厅科技项目(2020Y21)。
关键词
花岗岩石粉
砂浆强度
细度
灰关联熵分析
微观形貌
granite powder
mortar strength
fineness
grey relational entropy analysis
micro-morphology
