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丰土根, 厉治平, 张箭, 谢康. 基于二氧化碳泡沫水泥浆的淤泥固化研究[J]. 岩土工程学报, 2024, 46(12): 2538-2547. DOI: 10.11779/CJGE20230869
引用本文: 丰土根, 厉治平, 张箭, 谢康. 基于二氧化碳泡沫水泥浆的淤泥固化研究[J]. 岩土工程学报, 2024, 46(12): 2538-2547. DOI: 10.11779/CJGE20230869
FENG Tugen, LI Zhiping, ZHANG Jian, XIE Kang. Sludge solidification based on carbon dioxide foam cement slurry[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2538-2547. DOI: 10.11779/CJGE20230869
Citation: FENG Tugen, LI Zhiping, ZHANG Jian, XIE Kang. Sludge solidification based on carbon dioxide foam cement slurry[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2538-2547. DOI: 10.11779/CJGE20230869

基于二氧化碳泡沫水泥浆的淤泥固化研究

Sludge solidification based on carbon dioxide foam cement slurry

  • 摘要: 河湖疏浚会产生大量疏浚淤泥,其含水率、压缩性均较高。采用二氧化碳作为泡沫气体源制备二氧化碳泡沫水泥浆材料并以此作为固化材料开展淤泥改良,对疏浚淤泥的资源再利用及对实现碳中和目标具有重要的意义。基于传统空气泡沫水泥浆制备技术与普通水泥基固碳机理,采用二氧化碳替代空气制备二氧化碳泡沫水泥浆并以此进行淤泥固化,对泡沫浆液养护后形成结石体试块的力学性能以及疏浚淤泥固化后形成填料的力学性能和微观结构进行了试验研究。研究结果表明:发泡剂A2和稳泡剂C1的最佳组合为4,5 g/L;水泥水化水解产物中Ca(OH)2与CO2生成CaCO3的转化率约增加26.1;水泥浆中粉煤灰的最佳掺量为30%;固化后形成的固化料的无侧限抗压强度、内摩擦角及黏聚力与泡沫浆液的掺量呈近似线性递增关系,而渗透系数与泡沫浆液的掺量呈近似线性递减关系。研究成果为淤泥固化的工程应用和二氧化碳“变废为宝”的途径提供重要指导。

     

    Abstract: River and lake dredging will produce a large amount of dredged sludge with high water content and compressibility. Using the carbon dioxide as the foam gas source to prepare carbon dioxide foam cement slurry and use it as the solidification material to carry out sludge improvement is of great significance to the reuse of dredged sludge resources and to achieve the goal of carbon neutrality. Based on the traditional air foam cement slurry preparation technology and ordinary cement-based carbon fixation mechanism, the carbon dioxide foam cement slurry is prepared with carbon dioxide instead of air, which is used to solidify the sludge. The mechanical properties of stone test blocks formed after the curing of foam slurry and the mechanical properties and microstructure of filler formed after the solidification of dredged sludge are studied experimentally. The results show that the best combination of foaming agent and foam stabilizer is A2 4g/L, C1 5g/L. The conversion rate of Ca (OH)2 and CO2 to CaCO3 in the cement hydration hydrolysis product increases by about 26.1%. The optimal content of fly ash in cement slurry is 30%. The unconfined compressive strength, internal friction angle and cohesion of the solidified materials formed after curing approximately linearly increase with the content of foam slurry, while the permeability coefficient approximately linearly decreases with the content of foam slurry. The research results provide important guidance for the engineering application of sludge solidification and the way to "turn waste into treasure" of carbon dioxide.

     

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