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Abstract
In this study, coal gangue was used to replace the four single-graded natural gravels of 0~5 mm, 5~10 mm, 10~20 mm, and 20~26.5 mm to design the mix ratio and to study the influence in particle size changes of coal gangue on the mechanical properties of the mixture. The research results show that: The maximum dry density of the mixture with coal gangue is lower than the density of the natural crushed stone water-stable mixture, and the optimal moisture content is higher than that of natural crushed stone water-stable mixture; coal gangue aggregate is mixed with cement stabilized in the crushed stone mixture, and the 7d and 28d unconfined compressive strength, splitting strength, and compression rebound modulus values of the mixture are all reduced, which has a degrading effect on the mechanical properties of the mixture; however, both can attain high speed, which is the basic strength requirements for expressways, including first-class highways.
Highlights
In China, coal is the major energy source
Based on ordinary cement-stabilized crushed stone base materials, referring to the index requirements proposed in the Chinese standard, this study uses coal gangue instead of different grading particle sizes to influence the mechanical properties of the mixture and aims to develop a suitable Ningxia
Based on the "Technical Regulations for Highway Pavement Base Construction," the test pieces formed by the heavy compaction method were used to determine the optimum moisture content and maximum dry density of the mixture of coal gangue with different alternative particle sizes
Summary
In China, coal is the major energy source. Coal consumes 70% of its primary energy, which is more than twice the world average[1]. Coal gangue, instead of natural crushed stone aggregate, does not require special technical treatment and only requires a suitable crushing and screening method[2]. Based on ordinary cement-stabilized crushed stone base materials, referring to the index requirements proposed in the Chinese standard, this study uses coal gangue instead of different grading particle sizes to influence the mechanical properties of the mixture and aims to develop a suitable Ningxia. The coal gangue base material alleviates the shortage of natural aggregates and efficiently uses coal gangue materials. This conforms to the technical principles of localization of road construction materials and converts waste into valuable material
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