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穆佳啟

（云南省設計院集團勘察院有限公司，云南 昆明， 650228）

摘要：為推廣水泥改良膨脹土在寒冷地區的應用，探索工業廢渣資源化利用的新路徑，本次研究提出采用工業廢渣增強水泥改良膨脹土的抗凍性。得出主要結論如下：（1）工業廢渣協同水泥改良膨脹土的最佳配合比為14%水泥+10%粉煤灰+2%脫硫石膏；（2）ESC試件與ESC-FG試件的三軸應力應變曲線形態相似，但ESC-FG試件的應力應變曲線下降段比ESC試件平緩；凍融循環下，ESC-FG試件比ESC試件的外觀更完整、質量損失更小、強度更高，凍融循環20次后，ESC-FG試件的強度較ESC試件高89%；（3）通過SEM電鏡觀察發現，與ESC試件相比，ESC-FG試件的水化產物數量更多、結構更密，并形成以柱狀鈣礬石晶體和纖維狀硅酸鈣凝膠為結構骨架、硅酸鈣凝膠為包裹的致密結構，從而使其強度和抗凍性獲得顯著提升。

關鍵詞 ：膨脹土 ；工業廢渣 ；水泥 ；強度

中圖分類號 ：TU443           

文獻標志碼 ：A           

文章編號 ：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;

作者簡介 ：穆佳啟  ( 1982—) , 男， 高級工程師，本科，研 究方向：巖土工程地質勘察。

收稿日期 ：2022- 05- 17