机制砂片状颗粒对砂浆和混凝土性能与微观结构的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (6): 1981-1989.

所属专题：水泥混凝土

机制砂片状颗粒对砂浆和混凝土性能与微观结构的影响

黄志刚^1,2, 徐志华^1,2, 李北星³, 吕敦祥³, 黄安³

1.江西省交通工程集团有限公司,南昌 330000;
2.江西省桥梁智能养护工程技术研究中心,南昌 330000;
3.武汉理工大学硅酸盐建筑材料国家重点实验室,武汉 430070

收稿日期:2022-02-17 修订日期:2022-03-25 出版日期:2022-06-15 发布日期:2022-07-01
通信作者: 李北星,博士,教授。E-mail:libx0212@126.com
作者简介:黄志刚(1984—),男,高级工程师。主要从事道路建筑材料研究。E-mail:383613037@qq.com
基金资助:
江西省交通运输厅科技计划(2020H0002);国家重点研发计划(2020YFC1909904)

Effects of Flake Particles in Manufactured Sand on Properties and Microstructure of Mortar and Concrete

HUANG Zhigang^1,2, XU Zhihua^1,2, LI Beixing³, LYU Dunxiang³, HUANG An³

1. Jiangxi Transportation Engineering Group Co. Ltd., Nanchang 330000, China;
2. Jiangxi Province Engineering Research Center of Bridge Intelligence, Nanchang 330000, China;
3. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Received:2022-02-17 Revised:2022-03-25 Online:2022-06-15 Published:2022-07-01

摘要/Abstract

摘要： 机制砂(MS)中的片状颗粒会影响混凝土的性能。本文研究了机制砂中片状颗粒粒径(1.18~2.36 mm、2.36~4.75 mm、4.75~9.50 mm)及含量(10%、20%、30%,均为质量分数)对砂浆流动度和强度的影响,测定了片状颗粒含量不同的机制砂混凝土的工作性、抗压强度和电通量,并使用扫描电镜和压汞仪测试了片状颗粒含量不同的机制砂砂浆的界面微观结构和孔隙结构。结果表明,随着机制砂中片状颗粒含量的增加或片状颗粒粒径的增大,所配制的砂浆和混凝土的流动性、强度和抗渗性逐渐减小,且片状颗粒对抗折强度的影响程度高于抗压强度。相对于粒形规则的颗粒,片状颗粒会弱化水泥浆体与机制砂颗粒的界面过渡区,并增大砂浆的孔隙率,增加大尺寸多害孔的比例,从而导致砂浆和混凝土性能劣化。因此,应严格控制机制砂中片状颗粒含量尤其是片状粗砂颗粒的含量。

关键词: 机制砂, 片状颗粒, 砂浆, 混凝土, 力学性能, 界面, 孔结构

Abstract: The flake particles in manufactured sand (MS) affects the properties of concrete. The effects of the size (1.18~2.36 mm, 2.36~4.75 mm, 4.75~9.50 mm) and the content (10%, 20%, 30%, both are mass fraction) of the flake particles on the fluidity and strength of mortar were studied, and the workability, compressive strength and electrical flux of the concrete prepared from the MS with different content of flake particles were measured. The interface microstructure and pore structure of the MS mortar with different content of flake particles were examined by scanning electron microscope and mercury porosimeter. The results show that with the increase of the content or size of flake particles, the flowability, strength and impermeability of the MS mortar and concrete gradually decrease, and the reduction of flexural strength affected by flake particles from the MS is higher than that of compressive strength. Compared with the regular particles, flake particles weaken the interface transition zone between cement paste and MS particles, and increase the porosity of the mortar and the proportion of large-sized and harmful pores, resulting in the performance degradation of mortar and concrete. Therefore, the content of flake particles in MS, especially the flake coarse sand particles, should be strictly limited.

Key words: manufactured sand, flake particle, mortar, concrete, mechanical property, interface, pore structure

中图分类号:

TU528

黄志刚, 徐志华, 李北星, 吕敦祥, 黄安. 机制砂片状颗粒对砂浆和混凝土性能与微观结构的影响[J]. 硅酸盐通报, 2022, 41(6): 1981-1989.

HUANG Zhigang, XU Zhihua, LI Beixing, LYU Dunxiang, HUANG An. Effects of Flake Particles in Manufactured Sand on Properties and Microstructure of Mortar and Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(6): 1981-1989.

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机制砂片状颗粒对砂浆和混凝土性能与微观结构的影响

Effects of Flake Particles in Manufactured Sand on Properties and Microstructure of Mortar and Concrete

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