干旱区生态环境知识资源中心(Arid): Mechanics and road performance of mudstone modified stabilized gravel subgrade in arid desert areas

Arid

DOI	10.1016/j.cscm.2023.e02799
	Mechanics and road performance of mudstone modified stabilized gravel subgrade in arid desert areas
	Feng, Liqun; Liu, Wenbo; Jiang, Weijie; Wang, Guozhu
通讯作者	Liu, WB
来源期刊	CASE STUDIES IN CONSTRUCTION MATERIALS
ISSN	2214-5095
出版年	2024
卷号	20
英文摘要	This study investigates the feasibility of using mudstone to enhance poorly graded gravel in certain arid regions of the S21 Altay-Urumqi Highway project in Xinjiang. Despite mudstone typically being considered a poor-quality rock, its combination with higher-performance mate-rials like cement, lime, and fly ash can stabilize expansive soils for use as roadbed fill. In the experiments, 30% and 40% mudstone were added to the gravel mixture. The experiments were compared with unmodified K80 and 35% crushed rock mixes. The findings reveal that adding 30% mudstone substantially increased the California Bearing Ratio (CBR) of the gravel mix by over 20%. However, excessive mudstone inclusion could weaken load-bearing capacity. More-over, mudstone-modified specimens exhibited superior unconfined compressive strength (UCS), splitting strength, compressive resilience modulus (CRM), drying shrinkage resistance, and temperature shrinkage resistance. Under optimum cement dosage, the UCS of mudstone-modified specimens outperformed unmodified specimens, consistently surpassing fly ash-altered groups. Although mixed fly ash initially exhibited lower strength, it gradually approached cement-stabilized strength with an extended curing time. Incorporating crushed stone into the grading curve significantly increased splitting strength due to its high strength and hardness. In contrast, adding mudstone introduced a notable proportion of fine aggregates, resulting in a looser grading skeleton prone to early cracking. This research demonstrates that mudstone enhancement significantly improves roadbed performance, including increased CBR, splitting strength, and crack resistance. The use of mudstone in arid desert areas enhances overall performance while reducing shrinkage coefficients. The suggested approach for semi-rigid pavements in arid deserts recommends specific mineral proportions, various aggregate sizes, an appropriate amount of cement, and 30% mudstone to create dense structures with a higher quantity of coarse aggregate.
英文关键词	Subgrade design Mudstone mixing Compressive properties Splitting strength Grading optimization Arid desert area
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:001146789600001
WOS关键词	FLY-ASH ; CEMENT ; COMPACTION
WOS类目	Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary
WOS研究方向	Construction & Building Technology ; Engineering ; Materials Science
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403108
推荐引用方式 GB/T 7714	Feng, Liqun,Liu, Wenbo,Jiang, Weijie,et al. Mechanics and road performance of mudstone modified stabilized gravel subgrade in arid desert areas[J],2024,20.
APA	Feng, Liqun,Liu, Wenbo,Jiang, Weijie,&Wang, Guozhu.(2024).Mechanics and road performance of mudstone modified stabilized gravel subgrade in arid desert areas.CASE STUDIES IN CONSTRUCTION MATERIALS,20.
MLA	Feng, Liqun,et al."Mechanics and road performance of mudstone modified stabilized gravel subgrade in arid desert areas".CASE STUDIES IN CONSTRUCTION MATERIALS 20(2024).