Experimental Study on Coal Gangue Mixing Method and Durability of Pavement Base Mixture
WANG Decai1,*, WEI Jiawei1, HU Lei2, ZHANG Qing3,4, DONG Shi5, YANG Lan1, CHENG Kai1
1 School of Civil Engineering and Communication, North China University of Water Resources and Electric Power, Zhengzhou 450045, China 2 School of Water Conservancy and Transportation, Zhengzhou University, Zhengzhou 450001, China 3 Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang 453007, Henan, China 4 National Engineering Research Center of Highway Maintenance Equipment, Henan Gaoyuan Highway Maintenance Technology Company Limited, Xinxiang 453000, Henan, China 5 School of Transportation Engineering, Chang’ an University, Xi’an 710064, China
Abstract: The application of coal gangue as road construction material in highway base is an effective way of green and high-value utilization of solid waste. In view of the tunneling coal gangue materials produced in northern Henan, the difference between coarse and fine aggregates of coal gangue and gravel was studied. Through repeated freeze-thaw test, dry shrinkage test and four-point bending fatigue test, the influence of coal gangue ratio replacement and particle size replacement of natural gravel on the durability of coal gangue mixture was analyzed. Based on XRD phase analysis test and SEM microscopic test, the internal mechanism of strength formation and failure of cement stabilized coal crushing mixture was discussed. The results show that the compressive strength of the four groups of mixtures after proportional replacement is 7.7%, 37.8%, 45.6% and 61.8% higher than that of 100%TCG, respectively. The order of strength loss rate and dry shrinkage coefficient is 100%LF＜40%TCG＜60%TCG ＜100%TCG, while the order of BDR value and fatigue life is opposite. The higher the content of coal gangue in the mixture, the greater the decrease in strength, the weaker the frost resistance, the greater the decrease in fatigue life, the greater the drying shrinkage. Under the particle size replacement method, replacing coarse and fine aggregates can increase the compressive strength and BDR value of the mixture and reduce the strength loss rate. The fatigue life of the mixture is ranked as 100%TCG ＜T4＜T1~2＜T1~3＜100%LF, while the dry shrin-kage strain of T1~2 and T1~3 is the smallest, and the dry shrinkage strain of T4 is the largest. Coal gangue fine aggregate has a gain effect on the dry shrinkage of the mixture, and more significantly affects the frost resistance of the mixture. The aggregate of 9.5—31.5 mm has more significant effect on the strength of the mixture, while the aggregate of 4.7—9.5 mm has less effect on the strength, frost resistance and fatigue life of the mixture. The mixture prepared by particle size replacement has better fatigue performance at low stress ratio, while the mixture prepared by proportional replacement is more suitable for high stress ratio scenarios. The increase of coal gangue aggregate will inhibit the production of gel and delay hydration reaction. 40%TCG and T4 produced more C-S-H gel and AFt crystal phase cementation, forming a dense gel network with stronger compactness and integrity. It is recommended that 40%TCG is used as the blending method of high-grade highway base.
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2025, Vol. 39 
