【摘要】 为了探究粉煤灰基尾矿碱激发地质聚合物的耐久性能，在常温条件下利用工业固体废料粉煤灰和尾矿制备地质聚合物，研究其抗冻融性能、抗硫酸盐侵蚀性能、干燥收缩性能。结果表明：在标准养护条件下，当尾矿含量为10%时，粉煤灰基尾矿碱激发地质聚合物28 d抗压强度可达40.1 MPa,减少激发剂用量会降低其抗冻性；在抗硫酸盐侵蚀性方面，经过150 d干湿循环后粉煤灰基尾矿碱激发地质聚合物的抗蚀系数不低于0.90,质量损失小于5%;粉煤灰基尾矿碱激发地质聚合物收缩值比硅酸盐水泥大，是水泥收缩值的3.4倍，增加激发剂掺量、减少矿渣含量以及降低水胶比均可抑制地质聚合物的收缩变形，其中水胶比对降低地质聚合物收缩的作用显著，地质聚合物的收缩值可以减少25.07%;地质聚合物试件断面上有未定形的凝胶相，有利于提高地质聚合物的耐久性。本研究可为粉煤灰基尾矿碱激发地质聚合物的应用提供理论依据及参考。更多还原

【Abstract】 In order to explore the durability of geopolymer stimulated by alkali of fly ash-based tailings, the industrial solid waste fly ash and tailings were used to prepare geopolymer at room temperature, and its freeze-thaw resistance, sulfate erosion resistance and drying shrinkage performance were studied.The results show that under standard curing conditions, when the content of tailings is 10%,the 28-day compressive strength of alkali excited geopolmer of fly ash-based tailings can reach 40.1 MPa, and reducing the amount of initiator will reduce its freezing resistance.In terms of sulfate resistance, after 150 days of dry and wet cycling, the corrosion resistance coefficient of alkali excited geopolymer of fly ash-based tailings is not less than 0.90,and the mass loss is less than 5%.Base tailings alkali excitation of fly ash geopolymer shrinkage value is bigger than Portland cement, 3.4 times that of concrete shrinkage, increase the excitation agent dosage, reduce the content of slag and reducing water-binder ratio can inhibit contraction deformation of geological polymer which water-binder ratio of lowering geopolymer shrink significantly, the contraction of geopolymer values can be reduced by 25.07%;There is an amorphous gel phase on the section of the geopolymer, which is beneficial to improve the durability of the geopolymer.This study can provide theoretical basis and reference for the application of geopolymer stimulated by alkali of fly ash based tailings.更多还原