Grading Optimization and Performance Study of Skeleton-dense Cement-stabilized Coal Gangue
JING Hongjun1,2,†,*, ZHANG Chaowei1,2,†, GAO Meng1,2, DING Renhong3, LI Yimin4, KANG Mingke1,2, ZHOU Zihan1,2, ZHU Shaofeng5
1 School of Architecture and Civil Engineering, Xi'an University of Science and Technology, Xi'an 710054, China 2 Road Engineering Research Centre, Xi'an University of Science and Technology, Xi'an 710054, China 3 Ankang Transportation Comprehensive Law Enforcement Detachment, Ankang 725099, Shaanxi, China 4 Ankang Road Transport Service Centre, Ankang 725199, Shaanxi, China 5 Dengfeng Local Road Administration Office, Dengfeng 452470, Henan, China
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.
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2025, Vol. 39 
