EXPERIMENTAL RESEARCH ON THE INFLUENCE OF COAL GANGUE AGGREGATE BEHAVIOR ON THE MECHANICAL PROPERTIES OF CONCRETE

The paper takes the fundamental nature of gangue aggregates，such as the type of coal gangues，the particle size grading and aggregate pretreatment as studied objects，the compressive strength and elastic modulus of gangue concrete with different curing periods(7d、28d、90d) are observed，its results can provide the basis for the mix design optimization of gangue concrete． Results of the trial indicate that the gangue itself strength greatly affected its concrete strength，and the gangue concrete could achieve the maximum strength under the condition of coal ganguecement matrix strength being harmonious with the cement matrix strength; in the low-strength cement matrix， improving the aggregates particle size and occupancy ratio could not improve its concrete strength; the pretreatment of spontaneous combustion gangue can improve the concrete strength，but the non-spontaneous combustion gangue is different．