Grey entropy analysis of the fineness of granite powder and mortar strength

Abstract

Abstract: In order to improvethe 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 10 μm and a decrease in particle content with a size of greater than 40 μm. 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 10~40 μm 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.

Key words: granite powder, mortar strength, fineness, grey relational entropy analysis, micro-morphology

CLC Number:

TB321

ZHANG Yun-sheng, HU Xiang-nan, XUE Cui-zhen. Grey entropy analysis of the fineness of granite powder and mortar strength[J]. Journal of Lanzhou University of Technology, 2023, 49(6): 16-21.

References

[1] 王建军.机制砂和石粉在山西晋中地区商品混凝土中的应用研究[D].兰州:兰州理工大学,2018.
[2] 关于推进机制砂石行业高质量发展的若干意见[J].江苏建材,2019(6):1-3.
[3] 董育汝.凝灰岩机制砂及其石粉在商品混凝土中的应用研究[D].兰州:兰州理工大学,2022.
[4] 陆宗平.研究机制砂特性对混凝土和易性影响的试验[J].建材与装饰,2020(15):45-47.
[5] 杜雪剑.机制砂颗粒形貌及级配的定量表征与研究[D].武汉:武汉理工大学,2020.
[6] SAHU A K,KUMAR S,SACHAN A K.Crushed stone waste as fine aggregate for concrete[J].The Indian Concrete Journal,2003,77(1):845-848.
[7] 谢开仲,王红伟,肖杰,等.石粉含量对机制砂混凝土力学性能影响试验[J].建筑科学与工程学报,2019,36(5):31-38.
[8] 孙茹茹,王振,黄法礼,等.不同岩性石粉-水泥复合胶凝材料性能研究[J].材料导报,2021,35(Sl):211-215.
[9] 张如林,陈玉前,刘书童,等.机制砂石粉含量对混凝土的性能影响研究[J].混凝土,2016,317(3):84-85.
[10] 王稷良,周明凯,朱立德,等.机制砂对高强混凝土体积稳定性的影响[J].武汉理工大学学报,2007(10):20-24.
[11] ZHANG W,HAN B,YU X,et al.Nano boron nitride modified reactive powder concrete[J].Construction and Building Materials,2018,179:186-197.
[12] XUE C,QIAO H,CAO H,et al.Analysis on the strength of cement mortar mixed with construction waste brick powder[J].Advances in Civil Engineering,2021,2021:1-10.
[13] 苏建宁,黄凯,张书涛,等.基于灰色关联理论的产品意象设计参数辨识方法[J].兰州理工大学学报,2012,38(6):20-23.
[14] 乔建刚,田亚磊,张恒.聚酯玻纤布防裂性能影响因素的灰熵分析[J].材料科学与工程学报,2018,36(2):250-253,184.
[15] 杨清熙,杜博文,宣兆龙,等.弹药贮存环境主要影响因素灰关联熵分析方法[J].兵器装备工程学报,2020,41(7):86-89.