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田    洋

（ 中國鐵建港航局集團有限公司總承包分公司 ，廣東 珠海 519000)

摘    要 ：CO₂ 碳化－水泥水化協同固化土是兼具固化增強和 CO₂ 永久封存雙重效能的新穎技術。然而，碳化水泥固化土宏微觀特征與耐侵蝕性的研究，目前明顯偏少 。通過抗壓強度 、掃描電鏡 、X 射線衍射和硫酸鹽侵蝕試驗 ，深入評價 CO₂ 碳化－水泥協同固化土抗壓強度 、微觀機制與耐侵蝕性 。結果表明 ：水分軟化作用引起濕水養護碳化試樣抗壓強度低于標準養護試樣 ，二者高低與標準養護時間 、碳化時間及施作順序緊密相關 ；CO₂ 碳化反應消耗水泥固化體系內部水化產物，生成細長棒狀霰石和立方體狀方解石，密集堆積于粒間孔隙和顆粒表 面進而提高試樣密實度與抗壓強度 ；硫酸鈉溶液浸泡試樣整體完整性良好，僅局部有少量土粒脫落 ，水泥固化土抵抗硫酸鹽侵蝕能力依次為 B - 7d>7d- C - 1d>C- 3d;  三種試樣抗壓強度隨浸泡時間變化規律基本一致 ， 即抗壓強度先快速下降 ，之后逐漸回升并有持續增長趨勢。

關鍵詞 ：CO2 碳化 ；水泥水化 ；強度 ；微觀結構 ；耐侵蝕性

       中圖分類號 ：TU447           

文獻標志碼 ：A            

文章編號 ：1005- 8249  (2023)   06- 0110- 06

DOI : 10. 19860/j . cnki . issn1005- 8249. 2023 . 06. 018

TIAN Yang

( General Contracting Company ,   CRCC  Harbour & Channel Engineering Bureau Group ,  Zhuhai 519000 ,   China)

Abstract: The combined soil solidification based on CO2 carbonation-cement hydration is a novel technology to realize the strength enhancement and permanent storage of CO2. However, there is quite little research on the macro- and micro- characteristics and erosion resistance of carbonated solidified soil. Through compressive strength, scanning electron microscope, X-ray diffraction and sulfate erosion tests, the strength, mechanism and erosion resistance of CO2 carbonated solidified soil were deeply evaluated. The results show that the compressive strength of carbonated samples cured in water is lower than that of standard samples due to the water softening effect, and their magnitude is closely related to curing time, carbonation time and their sequence. CO2 carbonation consumes cement hydration products to produce slender rod aragonite and cubic calcite, which are densely stacked in intergranular pores and particle surfaces, improving the compressive strength and compactness of sample. After being soaked in sulfate solution, the overall integrity of samples is still excellent, and only a small amount of soil particles fall off locally. The resistance of cement solidified soil to sulphate attack follows the order: B-7>7d-c-1d>c-3d. The change of compressive strength of samples with soaking time is nearly the same, i.e. the strength decreases rapidly at first, and then rises gradually, followed by a continuous growth trend.

Keywords: CO₂ carbonation; cement hydration; strength; microstructure; resistance to erosion

作者簡介： 田洋  (1973—) ,  男 ，學士 ，工程師／經濟師 。主 要研究方向 ：工程技術研發與項目施工管理。

收稿日期 ：2023- 05- 14