Li Sining, Huang Yong, Sun Jian, Cui Qiushuang, Yu Rui, Liu Yubin
State Key Laboratory of Chemistry and Utilization of Carbon Based Energy Resources, College of Chemistry, Xinjiang University, Urumqi, 830017, Xinjiang, People's Republic of China.
College of Civil Engineering and Architecture, Xinjiang University, Urumqi, 830017, Xinjiang, PR China.
Sci Rep. 2025 Jan 2;15(1):285. doi: 10.1038/s41598-024-82628-9.
In the framework of sustainable development and environmental preservation, this research aims to improve the stability and frost resistance of sulfate saline soil by utilizing industrial solid waste. Geopolymer materials containing fly ash (FA) activated by different NaOH concentrations were studied for study on stabilized soil with saline soil, with NaOH concentrations used ranged from 0.1 to 0.9. This study investigates the impact of the molar concentration of NaOH and the number of freeze-thaw cycles on the microstructure and strength of stabilized soil incorporating FA geopolymer. The XRD, FTIR, and TG studies of NaOH-excited FA stabilized soil revealed that the FA gel material grew with increasing concentration. The strength and frost resistance of stabilized soil increased and then declined as NaOH concentration increased, with an optimum excitation concentration of 0.5 M. After 28 days of curing at 20 °C, its UCS and splitting strength were 7.18 MPa and 1.89 MPa, respectively. The residual values of UCS and splitting strength after 5 freeze-thaw cycles (12 hours of freezing followed by 12 hours of thawing at +20 °C) at the optimal concentration were 46.35% and 39.92%, respectively.
在可持续发展和环境保护的框架下，本研究旨在通过利用工业固体废弃物来提高硫酸盐盐渍土的稳定性和抗冻性。研究了不同NaOH浓度激活的含粉煤灰（FA）的地质聚合物材料对盐渍土稳定土的影响，使用的NaOH浓度范围为0.1至0.9。本研究调查了NaOH的摩尔浓度和冻融循环次数对掺入FA地质聚合物的稳定土的微观结构和强度的影响。对NaOH激发的FA稳定土的XRD、FTIR和TG研究表明，FA凝胶材料随着浓度的增加而生长。随着NaOH浓度的增加，稳定土的强度和抗冻性先增加后下降，最佳激发浓度为0.5M。在20℃养护28天后，其无侧限抗压强度（UCS）和劈裂强度分别为7.18MPa和1.89MPa。在最佳浓度下进行5次冻融循环（在-20℃冷冻12小时，然后在+20℃解冻12小时）后，UCS和劈裂强度的残余值分别为46.35%和39.92%。
