煤气化粗渣-粉煤灰基地质聚合物的制备与性能

Preparation and Properties of Coal Gasification Coarse Slag-Fly Ash Based Geopolymer

煤气化渣与粉煤灰均为煤炭资源利用过程中产生的固体废弃物,可以应用在碱激发领域。从煤气化粗渣的性质入手,采用粉煤灰对煤气化粗渣进行改性,利用碱激发技术制备了煤气化粗渣-粉煤灰基地质聚合物,并对所制备产物的性能进行研究。结果表明,在体系中掺入粉煤灰可以明显改善其力学性能,当粉煤灰掺入量为30%(质量分数)时,样品的28 d抗压强度最高,达到44.5 MPa。此外,通过对样品进行物相分析与微观形貌表征发现,样品的无定形产物主要为N(C)-A-S-H凝胶,它能够结成相互连接的空间网状结构,具有较强的黏结能力,这是样品材料具有较高强度的主要原因。

Coal gasification slag and fly ash are solid wastes produced in the process of coal resource utilization, which can be used in the field of alkali-activation. In this paper, by studying the properties of coal gasification coarse slag, coal gasification coarse slag was modified with fly ash, and the coal gasification coarse slag-fly ash based geopolymer was prepared by alkali-activation technology, and the properties of prepared products were studied. The results show that adding fly ash into the system significantly improves its mechanical properties. When the mass fraction of fly ash is 30%, the 28 d compressive strength of the sample is the highest, which is 44.5 MPa. In addition, through the phase analysis and micro morphology characterization of the sample, it is found that the amorphous product of the sample is mainly N(C)-A-S-H gel, which can form an interconnected spatial network structure and has strong bonding ability, which is the main reason for the high strength of the sample material.