钢渣、粉煤灰协同增效下水泥稳定再生碎石基层性能研究

doi:10.16552/j.cnki.issn1001-1625.2024.1564

摘要/Abstract

摘要： 水泥稳定再生碎石存在强度不足和易收缩等问题,导致旧混凝土路面破碎再生技术的应用受限。为改善基于水泥稳定再生碎石基层的材料性能,引入钢渣和粉煤灰进行协同效应研究,并分析不同掺量的钢渣和粉煤灰对水泥粉煤灰稳定钢渣再生碎石(CFSSR)力学性能和路用性能的影响。研究结果表明,钢渣和粉煤灰对再生基层材料的力学性能和路用性能具有显著影响。随着钢渣和粉煤灰掺量的增加,CFSSR的无侧限抗压强度和劈裂强度均呈先增大后减小的趋势。当钢渣和粉煤灰的掺量分别为50%和16%(质量分数)时,CFSSR的7 d无侧限抗压强度达到最大值4.72 MPa,相较于普通水泥稳定再生碎石提高了25.20%。在此掺量下,钢渣和粉煤灰还显著降低了材料的干缩性,尽管对温缩性略有不利影响,但整体收缩性显著降低。在最佳掺量下,CFSSR内形成了大量针棒状钙矾石和水化硅酸钙(C-S-H)凝胶,两者相互交织并填充空隙,增强了结构的密实性,并产生了协同增强效应。本文为钢渣在公路养护工程中作为基层材料的应用提供了科学依据。

关键词: 再生基层材料, 钢渣, 粉煤灰, 强度, 收缩性, 水泥稳定再生碎石

Abstract: Due to the lack of strength and easy shrinkage of cement stabilized recycled aggregate, the application of old concrete pavement crushing and recycling technology is limited. In order to improve the properties of cement stabilized recycled aggregate, this paper introduced steel slag and fly ash to study the synergistic effect, and analyzed the influence of different content of steel slag and fly ash on the mechanical strength and road performance of cement-based fly ash stabilized steel slag recycled aggregate (CFSSR). The results show that steel slag and fly ash have significant effects on the mechanical properties and road performance of recycled base materials. Specifically, with the increase of steel slag and fly ash content, the unconfined compressive strength and splitting tensile strength of CFSSR increase and then decrease. When the content of steel slag and fly ash is 50% and 16% (mass fraction), the 7 d unconfined compressive strength of CFSSR reaches the maximum value of 4.72 MPa, which is 25.20% higher than that of ordinary cement stabilized recycled aggregate. In addition, steel slag and fly ash also significantly reduce the dry shrinkage of the material, although the temperature shrinkage is slightly adverse, but the overall shrinkage is effectively reduced. Under the optimal content, a large number of needle-rod ettringite and C-S-H gel are formed in CFSSR, which interweave and fill the void, enhance the compactness of the structure, and produce a synergistic enhancement effect. This paper provides a scientific basis for the application of steel slag as base material in highway maintenance engineering.

Key words: recycled base material, steel slag, fly ash, strength, contractility, cement stabilized recycled aggregate

中图分类号:

U414

王冬魁, 陈学武, 席爽, 王双喜, 江水. 钢渣、粉煤灰协同增效下水泥稳定再生碎石基层性能研究[J]. 硅酸盐通报, 2025, 44(5): 1957-1966.

WANG Dongkui, CHEN Xuewu, XI Shuang, WANG Shuangxi, JIANG Shui. Performance Study of Cement Stabilized Recycled Aggregate Base under Synergistic Effect of Steel Slag and Fly Ash[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(5): 1957-1966.

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