减水剂对赤泥-粉煤灰基地质聚合物性能的影响

摘要/Abstract

摘要： 针对地质聚合物需水量大、黏度高的问题,研究了木质素磺酸钠(SL)、聚羧酸减水剂(PC)、萘系减水剂(N)、三聚氰胺系减水剂(M)对赤泥-粉煤灰基地质聚合物性能的影响。通过FTIR、XRD、SEM-EDS分析了减水剂在碱溶液中的稳定性及其对赤泥-粉煤灰基地质聚合物物相、形貌和结构等的影响。结果表明,在相同液固比情况下,四种减水剂均可提高浆体流动度,流动度提高幅度从大到小依次是N、M、SL、PC。掺量不高于原料质量的0.50%时,SL与N对抗压强度有改善作用,对抗压强度的影响由优到劣依次是N、SL、M、PC。减水剂的掺入不会改变地质聚合物的物相组成,SL与N在碱溶液中相对稳定,但是PC与M在碱溶液中的稳定性较差。SL、PC、N、M的最佳掺量分别为0.50%、0.75%、0.50%、0.50%(质量分数)。

关键词: 地质聚合物, 赤泥, 粉煤灰, 减水剂, 流动度, 抗压强度, 凝结时间

Abstract: For the problem of high water demand and high viscosity of geopolymer, the effects of sodium lignosulfonate (SL), polycarboxylate superplasticizer (PC), naphthalene surperplasticizer (N) and melamine superplasticizer (M) on the performance of red mud-fly ash based geopolymer were investigated. The stability of water reducing agents in alkali solution and the effects on the phase, morphology and structure of red mud-fly ash based geopolymer were analyzed by FTIR, XRD and SEM-EDS. The results show that all the four water reducing agents could improve the fluidity of slurry with the same liquid-solid ratio, and the degree of fluidity improvement is N, M, SL, PC in the order from high to low. SL and N have an improved effect on the compressive strength when the dosing is not higher than 0.50% of the dry basis mass, and the effects on the compressive strength are N, SL, M, PC in order from excellent to poor. The addition of water reducing agents does not change the phase composition of geopolymer. SL and N are relatively stable in alkali solution, but PC and M are less stable in alkali solution. The optimum admixtures of SL, PC, N, M are 0.50%, 0.75%, 0.50%, 0.50% (mass fraction), respectively.

Key words: geopolymer, red mud, fly ash, water reducing agent, fluidity, compressive strength, setting time

中图分类号:

X75
TU52

潘荣祥, 杨敏, 袁宏. 减水剂对赤泥-粉煤灰基地质聚合物性能的影响[J]. 硅酸盐通报, 2023, 42(9): 3212-3220.

PAN Rongxiang, YANG Min, YUAN Hong. Effects of Water Reducing Agents on Performance of Red Mud-Fly Ash Based Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3212-3220.

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