Strength Characteristics and Mechanism of Red Mud-Fly Ash Stabilized Coal Gangue Base

被引：0
|
作者：
Ma L. [1 ]
Zhang X. [1 ]
Liu F. [1 ]
Liu Z. [1 ]
Li F. [2 ]
机构：
[1] School of Civil Engineering, Taiyuan University of Technology, Taiyuan
[2] School of Transportation Science and Engineering, Beihang University, Beijing
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2023年 / 26卷 / 07期
关键词：
coal gangue; fly ash; mechanical property; microscopic mechanism; red mud; road engineering;
D O I：
10.3969/j.issn.1007-9629.2023.07.009
中图分类号：
学科分类号：
摘要：
Using red mud，fly ash，desulfurized gypsum and an alkaline solid waste admixture as cementitious materials and coal gangue as aggregate，an environmentally friendly all industrial solid waste pavement base mixture （RFDC）was prepared. The development laws of unconfined compressive strength（fUCS）and splitting tensile strength （fSTS）of RFDC with different fly ash contents at 4 ages（7，28，56 and 90 d）were studied. Then the failure modes of the compressive and splitting tensile specimens were analyzed. The correlation between the molar ratio of three different oxides in solid waste cementitious materials and 7 d fUCS of the RFDC was discussed. The formation mechanism of RFDC strength was revealed. The results show that when the content of fly ash is 15%，the mechanical properties of the RFDC are the best. The compressive specimen presents a typical central compressive failure，and the split tensile specimen is damaged by coarse aggregate of coal gangue. The n（CaO）/［n（SiO2）+n（Al2O3）］value of the solid waste cementitious material has the closest correlation with the 7 d fUCS of the RFDC. Ettringite（AFt），aluminum-modified calcium silicate hydrate（C（- A）-S-H）gel and zeolite-like substances are the main hydration products that provide strength to the RFDC. © 2023 Tongji University. All rights reserved.
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页码：762 / 770
页数：8
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