碱激发钢渣矿渣复合基层材料的强度特性及微观机制

硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (8): 2640-2646.

碱激发钢渣矿渣复合基层材料的强度特性及微观机制

吴旻¹, 谢胜华¹, 葛根旺²

1.安徽工业大学建筑工程学院,马鞍山 243002;
2.马鞍山学院建筑工程学院,马鞍山 243100

收稿日期:2021-02-22 修回日期:2021-04-27 出版日期:2021-08-15 发布日期:2021-09-02
作者简介:吴旻(1984—),男,讲师。主要从事道路工程材料的研究。E-mail:wumin22395062@163.com
基金资助:
国家自然科学基金面上项目(51978002);金属矿山安全与健康国家重点实验室开放研究基金(2018JSKSSYS02);安徽省高校自然科学研究重大项目(KJ2016SD08)

Strength Chatacteristics and Micro-Mechanism of Alkali-Activated Steel Slag-Blast Furnace Slag Road Base Composite Material

WU Min¹, XIE Shenghua¹, GE Genwang²

1. School of Civil Engineering and Architecture, Anhui University of Technology, Maanshan 243002, China;
2. School of Civil Engineering and Architecture, Maanshan University, Maanshan 243100, China

Received:2021-02-22 Revised:2021-04-27 Online:2021-08-15 Published:2021-09-02

摘要/Abstract

摘要： 围绕钢渣再利用、钢渣矿渣复合材料强度提升及微观作用机理这3个问题,从无侧限抗压强度和劈裂强度两个指标分析混合料不同养护龄期下的宏观强度,同时进行XRD、SEM和热重分析等微观试验,探讨了在石灰激发作用下,钢渣矿渣基层材料的水化产物生成和强度变化内在机制。强度试验结果表明:当矿渣掺量在10%(质量分数)以内,石灰与矿渣的质量比在1∶1~1∶2时,混合材料各龄期的无侧限抗压强度和劈裂强度较高。微观试验结果表明:适量Ca(OH)₂能够提高矿渣中SiO₂的水化反应速率,从而提升复合材料早期强度。此外,水化反应生成钙矾石、粉煤灰及钢渣中惰性组分的细料填充作用也是材料早强增长的有利因素。而粉煤灰的火山灰效应和钢渣中C₂S的持续水化反应则有助于复合材料后期强度的提升。

关键词: 道路工程, 基层材料, 钢渣, 矿渣, 水化反应, 强度特性

Abstract: Focusing on the three issues of steel slag recycling, the strength enhancement of steel slag-blast furnace slag composite material as well as the microscopic action mechanism, the macroscopic strength of the mixture under different curing ages was analyzed from the two indicators of unconfined compressive strength and splitting strength. Besides, the internal mechanism of hydration products and strength formation of steel slag-blast furnace slag road base material under the lime activated were researched by XRD, SEM and thermogravimetric analysis. The strength test results show that when the mineral slag content is within 10% (mass fraction) and the mass ratio of lime and slag is between 1∶1 and 1∶2, the unconfined compressive strength and splitting strength of the mixed materials are higher than other lime and slag ratio at all ages. The microscopic test results reveal that an appropriate amount of Ca(OH)₂ can promote the hydration reaction rate of SiO₂ in the mineral slag, and improve the early strength of the composite material. In addition, the filling effect of the ettringite generated by the hydration reaction, fly ash and the inert components in the steel slag is also a favorable factor for the early strength growth of the material. The pozzolanic effect of fly ash and the continuous hydration reaction of C₂S in steel slag are contributed to the improvement of the later strength of the composite material.

Key words: road engineering, road base material, steel slag, blast furnace slag, hydration, strength chatacteristic

中图分类号:

TU521

吴旻, 谢胜华, 葛根旺. 碱激发钢渣矿渣复合基层材料的强度特性及微观机制[J]. 硅酸盐通报, 2021, 40(8): 2640-2646.

WU Min, XIE Shenghua, GE Genwang. Strength Chatacteristics and Micro-Mechanism of Alkali-Activated Steel Slag-Blast Furnace Slag Road Base Composite Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2640-2646.

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