Research on the Fundamental Mechanical Properties of Raw Coal Gangue Concrete and Its Influencing Factors
To enhance the resource utilization of raw coal gangue,this study partially or fully replaced raw coal gangue with natural aggregates to prepare concrete.The effects of factors such as water-cement ratios,replacement rates,the addition of silica fume and mixing methods on the compressive strength,splitting strength,stress-strain relationship curve,elastic modulus,peak load and peak strain of specimens were analyzed.Additionally,the microstructure charac-teristics of the specimens'failure surfaces were observed using scanning electron microscopy.The results show that the mechanical properties of raw coal gangue concrete were improved by using a secondary mixing process,and the combination of the secondary mixing process with the addition of silica fume.The former method exhibited greater improvement than the latter.An increase in replacement rate and water-cement ratio is detrimental to the mechanical performance of non-self-igniting coal gangue concrete specimens,with the latter experiencing a greater reduction in magnitude.Furthermore,scanning electron microscopy observations reveal that the interfacial transition zones of the specimens using the secondary mixing process exhibited fewer pores and a denser structure,which effectively im-proved the macroscopic mechanical properties of the specimens.
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