Effect of Lithium Slag Dosage on Strength and Dry Shrinkage Properties of Cement Stabilized Recycled Macadam

Authors

ZHAO Ziyu, School of Transportation, Changsha University of Science & Technology, Changsha, Hunan 410114, ChinaFollow
GAN Xianyong, School of Transportation, Changsha University of Science & Technology, Changsha, Hunan 410114, ChinaFollow

Corresponding Author

甘先永, 男, 博士, 高级工程师. E-mail: 403626313@qq.com

Abstract

To improve the mechanical properties and dry shrinkage properties of cement stabilized bases formed by cold in-place recycling of cement concrete pavements,lithium slag was mixed into the recycled mixture in mass ratios of 0%,6%,9%,and 12%.The effects of lithium slag dosage on the mechanical,dry shrinkage,and water stability properties of the recycled base were analyzed through the unconfined compressive strength,splitting,dry shrinkage,and water stability tests,and the mechanism underlying the improving effect of lithium slag on the cement stabilized base formed by cold in-place recycling of the cement concrete pavement was analyzed by X-ray diffraction (XRD ) and scanning electron microscopy (SEM ).The results show that lithium slag can reduce the dry shrinkage coefficient of the recycled base,and improve a little the early unconfined compressive strength,splitting strength,and water stability of the recycled base,but significantly enhance the strength in the later period.Particularly,the recycled cement stabilized base with 9% lithium slag exhibited the best mechanical properties,cracking resistance,and water stability.The incorporation of lithium slag reduces the diffraction peak of CH and enhances that of C —S—H.Moreover,the formed C —S—H refines the internal pore structure of the recycled mixture,thereby improving its densification.As an environmentally friendly industrial by-product,lithium slag can be incorporated into the recycled cement stabilized base to optimize the strength and water stability of the base material in the later period and reduce the cracking risk of the recycled base.

Publication Date

12-24-2025

DOI

10.14048/j.issn.1671-2579.2025.06.013

First Page

111

Last Page

118

Submission Date

December 2025

Recommended Citation

Ziyu, ZHAO and Xianyong, GAN (2025) "Effect of Lithium Slag Dosage on Strength and Dry Shrinkage Properties of Cement Stabilized Recycled Macadam," Journal of China & Foreign Highway: Vol. 45: Iss. 6, Article 13.
DOI: 10.14048/j.issn.1671-2579.2025.06.013
Available at: https://zwgl1980.csust.edu.cn/journal/vol45/iss6/13

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