钢渣微粉-粉煤灰基地质聚合物性能研究及微观结构分析

摘要/Abstract

摘要： 采用钢渣微粉和粉煤灰为主要原材料制备地质聚合物,以抗压强度为指标优化制备条件,探讨影响地质聚合物强度的因素,利用SEM、XRD和TG-DSC等手段对产物的微观形貌、物相组成和热稳定性进行分析表征。研究表明,地质聚合物的抗压强度随着钢渣微粉掺量和激发剂掺量增加先增加后减小,随温度增加而增加,其中养护温度影响最显著,水玻璃模数影响最小。最佳工艺条件为:水玻璃模数1.0、激发剂掺量20%(质量分数)、钢渣微粉掺量20%(质量分数)、液固比0.3、养护温度60 ℃。其3 d和7 d抗压强度高达40.11 MPa和43.03 MPa,固化Pb²⁺后对其强度影响较小,固化率在99.99%以上。地质聚合物表面致密度高,无明显裂纹,未观察到明显的钢渣颗粒轮廓,晶相结构主要为石英和莫来石,热稳定好。

关键词: 钢渣微粉, 粉煤灰, 地质聚合物, 抗压强度, 微观结构, 固化Pb²⁺

Abstract: Steel slag powder and fly ash were used as the main raw materials to prepare geopolymers. The compressive strength was used as the index to optimize the preparation conditions. The factors affecting strength of the geopolymers were discussed. The phase composition, microstructure and thermostability of the products were characterized by SEM, XRD and TG-DSC. The results show that the compressive strength of geopolymer increases first and then decreases with the increase of the content of steel slag powder and activator, and increases with the increase of curing temperature, among which curing temperature is the most significant factor, and modulus of sodium silicate is the weakest. The optimum process conditions are as follows: sodium silicate modulus 1.0, sodium silicate content 20% (mass fraction), steel slag powder content 20% (mass fraction), liquid-solid ratio 0.3, curing temperature 60 ℃. The 3 d and 7 d compressive strength of geopolymers are as high as 40.11 MPa and 43.03 MPa. Solidified Pb²⁺ has little effect on its strength and the solidified effect is more than 99.99%. Geopolymer has high surface density, excellent thermal stability, and no obvious crack and obvious steel slag particle profile is not observed. Its crystal phase is mainly quartz and mullite.

Key words: steel slag, fly ash, geopolymer, compressive strength, microstructure, solidified Pb²⁺

中图分类号:

TQ172

张西玲, 郭海峰, 汤子奇, 何志伟, 宋丽婷, 余梦琴. 钢渣微粉-粉煤灰基地质聚合物性能研究及微观结构分析[J]. 硅酸盐通报, 2021, 40(12): 4044-4051.

ZHANG Xiling, GUO Haifeng, TANG Ziqi, HE Zhiwei, SONG Liting, YU Mengqin. Properties and Microstructure of Steel Slag Powder-Fly Ash Based Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4044-4051.

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