本文研究了水量、碱量、水玻璃量和矿渣对粉煤灰(FA)地质聚合物凝结时间的影响.用扫描电子显微镜(SEM)对样品微观形貌进行了表征,用核磁共震(~(29)SiNMR)对激发剂的结构进行了表征.结果表明:H_2O/FA比对凝结时间影响较大,当H_2O/FA比从0.29增加到0.36,终凝时间由120 min增加到280 min;NaOH/FA比对凝结时间和抗压强度的影响一致,它们均随NaOH/FA比的增加而提高,当NaOH/FA比为0.1时,终凝时间最长为200 min,抗压强度最高为70 MPa;Na_2SiO_3/FA比对地质聚合物凝结时间影响不大;加入矿渣使凝结时间明显缩短.粉煤灰地质聚合物的凝结时间可以通过H_2O/FA质量比、NaOH/FA质量比和加入矿渣进行调节.
The effects of the ratios of H_2O/FA (fly ash), NaOH/FA, water glass/FA and calcium compounds addition on setting time of geopolymers were investigated. The hardened products were examined by scanning electron microscope (SEM) and the activating solutions were analyzed by nuclear magnetic resonance (~(29)SiNMR). As a result, the final setting times of geopolymers prolonged from 120 min to 280 min as the ratio of H_2O/FA increases from 0.29 to 0.36. The setting time of geopolymer was prolonging with the ratio of NaOH/FA increasing. The trend of compressive strength of geopolymers was the same as that of setting time. When the ratio of NaOH/FA was 0.1, the final setting time sample was longest with 200 min and the compressive strength was highest with 70 MPa. The ratio of Na_2SiO_3/FA has a little effect on setting time. It was found that slag shortened the setting time by providing heterogeneous nucleation centers. The setting time of geopolymers can be adjusted by the ratio of H_2O/FA, NaOH/FA and slag.
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