骨架密实型水泥稳定煤矸石级配设计与性能研究

doi:10.11896/cldb.22040252

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Abstract To study the effect of grading on road performance of cement-stabilized gangue, this work utilized the coal gangue from Xiaobaodang coal mine in Yulin, Shaanxi Province as the research object. Based on the grade-by-step filling method and the K method, the optimal ratio of coarse/fine aggregates of coal gangue was determined according to the results of 7 d unconfined compressive strength (UCS), and the appropriate grading range of skeleton-dense cement-stabilized gangue aggregates was then obtained. On this basis, this work carried out relevant tests such as splitting strength (SS), compressive rebound modulus (CRM), frost resistance, and shrinkage characteristics, and made a comparative analysis on the aforementioned performance indexes of the mixtures prepared using the obtained grading range's upper limit, mean value, and lower limit with that prepared using the specification-recommended grading range's mean value (GF). The results showed that a coarse-fine aggregate ratio of coal gangue of 40%—50% could result in a skeleton-dense structure of the cement-stabilized coal gangue. When the cement dosage was 5%, compared with the GF grading specimen, the specimen with the proportion of mean value of the optimized grading (TJ2) exhibited 38.03%, 40.13% and 34.93% higher UCSs after curing for 7, 28, 90 d, respectively (with 7 d UCS>3.0 MPa), and a 30.13% higher coefficient of frost resistance after curing for 28 d, as well as a 35.85% lower coefficient of dry shrinkage. It could be concluded that the cement-stabilized coal gangue prepared using the optimized grading is superior to the product with specification-recommended grading in road performance.

Key words： grading optimization skeleton compaction coal gangue mechanical property frost resistance

Published: 25 January 2025 Online: 2025-01-21

CLC number:

U414

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	Articles by authors
	JING Hongjun
	ZHANG Chaowei
	GAO Meng
	DING Renhong
	LI Yimin
	KANG Mingke
	ZHOU Zihan
	ZHU Shaofeng

Cite this article:

JING Hongjun,ZHANG Chaowei,GAO Meng, et al. Grading Optimization and Performance Study of Skeleton-dense Cement-stabilized Coal Gangue[J]. Materials Reports, 2025, 39(2): 22040252-7.

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https://www.mater-rep.com/EN/10.11896/cldb.22040252 OR https://www.mater-rep.com/EN/Y2025/V39/I2/22040252

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