缓凝剂对矿渣-赤泥基地质聚合物性能的影响

doi:10.16552/j.cnki.issn1001-1625.2024.1455

摘要/Abstract

摘要： 作为新型绿色低碳材料,地质聚合物因强度高、凝结时间短、耐腐蚀、低碳、环保等优点而受到广泛关注,但地质聚合物凝结时间短,在实际应用中不利于施工。为增强地质聚合物的实际操作性,本研究选用三聚磷酸钠(STPP)和酒石酸钾钠(SS)作为缓凝剂,研究缓凝剂对矿渣-赤泥基地质聚合物试样凝结时间、流动性、抗压强度和抗折强度的影响,通过X射线衍射(XRD)、红外光谱(FT-IR)、扫描电子显微镜(SEM)和水化热分析等方式,探究缓凝剂对矿渣-赤泥基地质聚合物凝结硬化的影响。结果表明,STPP和SS均能延缓矿渣-赤泥基地质聚合物的水化硬化;当STPP和SS质量分数均为7%时,RG-STPP-7%试样28 d抗压强度降低1.8%,抗折强度降低1.3%,RG-STPP-7%试样28 d抗压强度降低19.2%,抗折强度升高7.7%。缓凝剂含量增加会降低地质聚合物强度,STPP和SS含量存在适宜范围,均为3%左右。STPP和SS主要通过吸附和络合作用来降低矿渣-赤泥基地质聚合物凝胶材料的凝结硬化速率。

关键词: 缓凝剂, 地质聚合物, 矿渣, 赤泥, 凝结时间

Abstract: Geopolymer as a new type of green low-carbon material, has attracted widespread attention due to its advantages such as high strength, short setting time, corrosion resistance, low carbon emissions, and environmental friendliness. However, the setting time of geopolymers is short, which is not conductive to construction in practical applications. To enhance the practical operability of geopolymer, this study selected sodium tripolyphosphate (STPP) and seignette salt (SS) as retarders. It investigated their effects on the setting time, fluidity, compressive strength, and flexural strength of slag-red mud geopolymer. Through methods such as X-ray diffraction (XRD), infrared spectrum (FT-IR), scanning electron microscope (SEM), and heat of hydration analysis, the study explored the impacts of retarders on the setting and hardening process of slag-red mud geopolymer. The results indicate that STPP and SS can both delay the hydration hardening of slag-red mud geopolymer. When the mass fraction of STPP and SS are both 7%, the compressive strength of the RG-STPP-7% sample at 28 d decreases by 1.8%, while the flexural strength decreases by 1.3%. In contrast, the 28 d compressive strength of the RG-STPP-7% sample decreases by 19.2%, and the flexural strength increases by 7.7%. Increasing the content of the retarder reduces the strength of geopolymer, with an optimal range of about 3%. STPP and SS primarily delay the setting and hardening rate of slag-red mud geopolymer gel materials through adsorption and complexation.

Key words: retarder, geopolymer, slag, red mud, setting time

中图分类号:

TU528.042.3

袁宏, 杨敏, 蔡婷娅, 潘荣祥. 缓凝剂对矿渣-赤泥基地质聚合物性能的影响[J]. 硅酸盐通报, 2025, 44(7): 2589-2596.

YUAN Hong, YANG Min, CAI Tingya, PAN Rongxiang. Effect of Retarder on Performance of Slag-Red Mud Geopolymer[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(7): 2589-2596.

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