高强粉煤灰-渣土人造骨料的制备与微结构表征

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (8): 2819-2827.

高强粉煤灰-渣土人造骨料的制备与微结构表征

张日红¹, 明维¹, 万文豪², 刘云鹏²

1.宁波中淳高科股份有限公司,宁波 315000;
2.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:2022-03-09 修回日期:2022-04-18 出版日期:2022-08-15 发布日期:2022-08-30
通讯作者: 刘云鹏,博士,副研究员。E-mail:liuyunpeng@whut.edu.cn
作者简介:张日红(1963—),男,博士,教授级高级工程师。主要从事高性能混凝土材料及制品技术研究。E-mail:zhangrh@zcone.com.cn
基金资助:
宁波市科技创新2025重大专项(20191ZDYF020159)

Manufacture and Microstructural Characterization of Fly Ash-Muck Artificial Aggregates with High Strength

ZHANG Rihong¹, MING Wei¹, WAN Wenhao², LIU Yunpeng²

1. Ningbo Zhongchun Hi-Tech Co., Ltd., Ningbo 315000, China;
2. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China

Received:2022-03-09 Revised:2022-04-18 Online:2022-08-15 Published:2022-08-30

摘要/Abstract

摘要： 研究了不同比例工程渣土与粉煤灰对高强、低吸水率人造骨料物理性能的影响规律,并利用X射线衍射仪、X射线显微成像系统(X-CT)、压汞仪及扫描电镜等手段研究导致人造骨料物理性能差异的原因。结果表明,人造骨料的密度和强度随着粉煤灰掺量的提高先上升后降低,吸水率先降低后上升,当粉煤灰掺量为50%(质量分数)时,可制备表观密度为2.17 g/cm³,抗压强度为22.88 MPa,吸水率为0.055%的高强、低吸水率人造骨料。人造骨料强度的降低和吸水率的提高主要是液相不足造成的孔隙率增加,原料中Al₂O₃含量过高会导致骨料难以形成液相,影响其物理性能。

关键词: 固体废弃物, 人造骨料, 粉煤灰, 渣土, 物理性能, 微观形貌

Abstract: The effect of different proportion of engineering muck and fly ash on the physical properties of artificial aggregates with high strength and low water absorption was studied. Moreover, the mineral composition, microstructure and porosity of artificial aggregates were characterized by X-ray diffractometer, X-ray computed tomography (X-CT), mercury intrusion porosimetry and scanning electron microscope. The results indicate that the density and strength of artificial aggregates increase firstly and then decrease with the increase of fly ash content. However, the water absorption variation shows the opposite trend. When the fly ash content is 50% (mass fraction), thehigh strength and low water absorption artificial aggregates with an apparent density of 2.17 g/cm³, compressive strength of 22.88 MPa, and water absorption rate of 0.055% are prepared. The decrease in the strength of artificial aggregates and the increase in water absorption is mainly due to the increased porosity caused by the insufficient liquid phase. High Al₂O₃ content in the raw material hinders the formation of a liquid phase, which degrades the physical properties of artificial aggregates.

Key words: solid waste, artificial aggregate, fly ash, muck, physical property, microstructure

中图分类号:

X705

张日红, 明维, 万文豪, 刘云鹏. 高强粉煤灰-渣土人造骨料的制备与微结构表征[J]. 硅酸盐通报, 2022, 41(8): 2819-2827.

ZHANG Rihong, MING Wei, WAN Wenhao, LIU Yunpeng. Manufacture and Microstructural Characterization of Fly Ash-Muck Artificial Aggregates with High Strength[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2819-2827.

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