煤矸石集料性质对混凝土力学性能影响的试验研究

主要研究煤矸石集料的基本性质:矸石种类、颗粒级配、集料的预处理方式等对混凝土7,28,90d抗压强度及弹性模量的影响规律,为煤矸石集料混凝土的优化配合比设计提供依据。试验结果表明:矸石集料自身的强度极大地影响混凝土的强度,在不同强度的水泥基体下,当水泥基体强度与集料强度相协调时,其混凝土的强度才能达到最大,但是在低强的水泥基体下,提高矸石集料的粒径尺寸及比例,并不能提高混凝土的强度;自燃矸石集料经过预湿处理,能够提高混凝土的力学性能,但非自燃矸石集料经预湿处理后,并不能提高其混凝土的力学性能。

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.