Wang Xiaoyu, Wu Yangyang, Li Xiangguo, Li Yuheng, Tang Wen, Dan Jianming, Hong Chenglin, Wang Jinyu, Yang Xiaoqiang
School of Chemistry and Chemical Engineering, Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, Shihezi University, Shihezi 832003, China.
State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430074, China.
Materials (Basel). 2024 Aug 7;17(16):3921. doi: 10.3390/ma17163921.
Geopolymer foam concrete (GFC), an emerging thermal insulation material known for its environmentally friendly and low-carbon attributes, has gained prominence for its use in bolstering building energy efficiency. A critical challenge in GFC production is foam destabilization by the alkaline environment in which foam is supersaturated with salt. In this study, GFC was prepared by using triterpene saponin (TS), sodium dodecyl sulphate (SDS), and cetyltrimethylammonium bromide (CTAB) as blowing agents, with fly ash as the precursor and calcium carbide slag (CA) combined with Glauber's salt (GS, NaSO ≥ 99%) as the activator. The effect of GFC on mechanical properties was analyzed by examining its fluidity, pore structure, dry density, and compressive strength. The results show that TS has a stable liquid film capable of adapting to the adverse effects of salt supersaturation and alkaline environments. TS is highly stable in the GFC matrix, and so the corresponding pore size is small, and the connectivity is low in the hardened GFC. In addition, the hydration products of GFC exhibit different morphologies depending on the surfactant used. TS has better water retention due to hydrogen bonding, which facilitates the hydration process.
地质聚合物泡沫混凝土（GFC）是一种新兴的保温材料，以其环保和低碳特性而闻名，因其在提高建筑能源效率方面的应用而受到关注。GFC生产中的一个关键挑战是泡沫在碱性环境中失稳，在这种环境中泡沫会被盐过度饱和。在本研究中，以粉煤灰为前驱体，电石渣（CA）与芒硝（GS，Na₂SO₄≥99%）复合作为激发剂，使用三萜皂苷（TS）、十二烷基硫酸钠（SDS）和十六烷基三甲基溴化铵（CTAB）作为发泡剂制备了GFC。通过检测其流动性、孔隙结构、干密度和抗压强度，分析了GFC对力学性能的影响。结果表明，TS具有稳定的液膜，能够适应盐过饱和和碱性环境的不利影响。TS在GFC基体中高度稳定，因此相应的孔径较小，硬化后的GFC中连通性较低。此外，根据所使用的表面活性剂不同，GFC的水化产物呈现出不同的形态。TS由于氢键作用具有更好的保水性，这有利于水化过程。
