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穆佳启

（云南省设计院集团勘察院有限公司，云南 昆明， 650228）

摘要：为推广水泥改良膨胀土在寒冷地区的应用，探索工业废渣资源化利用的新路径，本次研究提出采用工业废渣增强水泥改良膨胀土的抗冻性。得出主要结论如下：（1）工业废渣协同水泥改良膨胀土的最佳配合比为14%水泥+10%粉煤灰+2%脱硫石膏；（2）ESC试件与ESC-FG试件的三轴应力应变曲线形态相似，但ESC-FG试件的应力应变曲线下降段比ESC试件平缓；冻融循环下，ESC-FG试件比ESC试件的外观更完整、质量损失更小、强度更高，冻融循环20次后，ESC-FG试件的强度较ESC试件高89%；（3）通过SEM电镜观察发现，与ESC试件相比，ESC-FG试件的水化产物数量更多、结构更密，并形成以柱状钙矾石晶体和纤维状硅酸钙凝胶为结构骨架、硅酸钙凝胶为包裹的致密结构，从而使其强度和抗冻性获得显著提升。

关键词 ：膨胀土 ；工业废渣 ；水泥 ；强度

中图分类号 ：TU443           

文献标志码 ：A           

文章编号 ：1005- 8249  (2023)   03- 0005- 06

 DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 03 . 005

MU Jiaqi

( Yunnan Design Institute Group Survey Institute Co. ，Ltd. ，Kunming China ,  650228)

Abstract: In order to promote the application of cement-modified expansive soil in cold regions and explore a new path for the resource utilization of industrial waste residues, industrial waste residues were used in this study to enhance the frost resistance of cement-modified expansive soils. The main conclusions are as follows: (1) The optimal mix ratio of industrial waste and cement to improve expansive soil is 14% cement + 10% fly ash + 2% desulfurized gypsum; (2) The shape of the triaxial stress-strain curve of the ESC specimen is similar to that of the ESC-FG specimen, but the stress-strain curve of the ESC-FG specimen is gentler than that of the ESC specimen; under freeze-thaw cycles, compared with the ESC specimen , the appearance of the ESC-FG specimen is more complete, the mass loss is smaller, and the strength is higher. After 20 freeze-thaw cycles, the strength of the ESC-FG specimen is 89% higher than that of the ESC specimen; (3) SEM observation showed that the hydration products of ESC-FG specimens were more numerous and denser than ESC specimens, and form a dense structure with columnar ettringite crystals and fibrous calcium silicate gel as the structural framework and calcium silicate gel as the package, so its strength and frost resistance are significantly improved.

Keywords: expansive soil; industrial waste residue; cement; strength;

作者简介 ：穆佳启  ( 1982—) , 男， 高级工程师，本科，研 究方向：岩土工程地质勘察。

收稿日期 ：2022- 05- 17