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将某低活性高硅尾矿经活化预处理后,分别掺入铝酸钠(SA)、偏高岭土(MK)、粉煤灰(FA)和铝酸盐水泥(AC)作为铝校正料,在碱激发剂作用下制备地聚合物;以试样的7 d抗压强度为考察指标,通过正交实验对各种铝校正料对应的反应体系的原料配比进行优化;为进一步提升试样的强度性能,将在优选配比下所制备的试样进行蒸压养护;通过SEM和27Al MAS-NMR对试样的微观形貌和所含Al的空间配位状态进行表征。结果表明:未做蒸压养护时,掺MK作铝校正料所制备的优选试样的7 d抗压强度最高(即为27.5 MPa),掺不同铝校正料所得优选试样对应的最佳因素水平组合各不相同,各因素对G-SA、G-MK、G-FA和G-AC体系中试样抗压强度指标的影响规律多数不一致;试样经蒸压养护后,其强度性能和微结构均有改善,且掺SA对应的优选试样的强度增长率最高;掺不同铝校正料形成的试样在微观形貌上存在差异,但都形成了稳定的具有地聚合物基本特征的三维空间网络结构。
A low active high silicon tailings was pretreated by activation, and then sodium aluminate (SA), metakaolin (MK), fly ash (FA) and aluminate cement (AC) Alkali activator. The 7 d compressive strength of the sample was taken as the investigation index to optimize the raw material ratio of the reaction system corresponding to various aluminum correction materials through orthogonal experiments. In order to further improve the quality of the sample Strength properties. Samples prepared under the optimal ratio were autoclaved. The microstructure of the samples and the spatial coordination state of Al were characterized by SEM and 27Al MAS-NMR. The results show that the best 7 d compressive strength (ie, 27.5 MPa) prepared by adding MK as the aluminum correction material is the best when the autoclave is not autoclaved. The results show that the influence of various factors on the compressive strength of G-SA, G-MK, G-FA and G-AC systems is mostly inconsistent. The microstructures of both samples were improved, and the preferred samples with SA doped had the highest rate of increase in strength. Specimens formed from different aluminum calibration materials differed in their microscopic morphology but both formed stable basic polymer- Three-dimensional space network structure.