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陈杰

( 中煤科工生态环境科技有限公司 , 天津   300457)

摘  要: 为提升工业固废资源化利用水平 , 以粉煤灰  (FA) 、电石渣  (CS) 和矿渣粉协同稳定煤矸石制备路基混合料 。通过设置 FA 与 CS 总掺量为 10%、15%、20% , 二者质量比为 0. 5、1. 0、1. 5、2. 0, 矿渣粉掺量为5%的配合比制备煤矸石路基混合料 , 进行了 7 d 无侧限抗压强度 、弯拉强度及抗压回弹模量试验 , 测试分析掺量对抗冻性能 、水稳定性及干缩变形的影响规律 。结果表明 : 7 d 无侧限抗压强度 、弯拉强度 、抗压回弹模量随FA 和 CS 掺量增加呈先增大后减小趋势 , 掺量为 15%、质量比为 1. 5 时最佳 ; 抗压强度随冻融循环次数增加逐渐降低 , 随干湿循环次数增加先增大后减小 ; 工业固废稳定煤矸石路基混合料中 FA、CS、矿渣粉 、煤矸石最佳配比分别为 9%、6%、5%、80%。研究成果可为工业固废在路基工程中的规模化利用提供理论支撑。

关键词: 煤矸石 ; 工业固废材料 ; 路基混合料 ; 力学强度 ; 耐久性能

中图分类号: U416. 1      文献标志码: A      文章编号: 1005-8249 (2026) 04-0143-07

DOI:10. 19860/j. cnki. issn1005-8249. 2026. 04. 021

 

Study on the Mechanical and Durability Properties of Coal Gangue Roadbed Mixtures

Stabilised with Industrial Solid Waste

CHEN Jie

(CCTEG Ecological Environment Technology Co. , Ltd. , Tianjin 300457, China)

Abstract: To enhance the resource utilisation of industrial solid waste, this study employs fly ash (FA) , calcium carbide slag (CS) and slag powder to synergistically stabilise coal gangue for producing subgrade mixtures.  Twelve coal gangue subgrade mixture designs were formulated by setting total FA and CS content at 10%、15%、20% , with mass ratios of 0. 5、1. 0、1. 5、 2. 0 between FA and CS, and a 5% slag powder content. Optimal mix designs were selected from the three dosage ranges based on 7 - day unconfined compressive strength, flexural strength, and compressive rebound modulus test results.  Further investigations examined the influence of dosage on freeze - thaw resistance, water stability, and dry shrinkage deformation. Results indicate: 7-day unconfined compressive strength, flexural strength, and compressive rebound modulus initially increase then decrease with rising FA and CS content, peaking at 15% content and a mass ratio of 1. 5; compressive strength gradually declines with increasing freeze-thaw cycles, while compressive strength initially increases then decreases with wet-dry cycles. The optimal proportions for FA, CS, slag powder, and coal gangue in the industrial solid waste-stabilised coal gangue subgrade mixture were determined to be 9%、6%、5%、80% , respectively. These findings provide theoretical support for the large- scale utilisation of industrial solid waste in subgrade engineering.

Key words: coal gangue; industrial solid waste materials; roadbed mixture; mechanical strength; durability performance