| 引用本文: | 林楚轩,孙宏磊,翁振奇.生物酶联合水泥固化淤泥力学性能及机理[J].哈尔滨工业大学学报,2024,56(7):46.DOI:10.11918/202302052 |
| LIN Chuxuan,SUN Honglei,WENG Zhenqi.Strength and solidification mechanism of cement solidified sludge improved with biological enzyme[J].Journal of Harbin Institute of Technology,2024,56(7):46.DOI:10.11918/202302052 |
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| 摘要: |
| 为改良淤泥强度,环保、高效解决疏浚淤泥处理问题,采用生物酶联合水泥对淤泥进行固化处理。通过无侧限抗压强度试验、直接剪切试验初步分析了生物酶对水泥固化淤泥强度的影响规律,并通过阳离子交换量试验（CEC）、电动电位试验、扫描电镜测试（SEM）、X射线衍射试验（XRD）和红外光谱试验（FTIR）等手段进一步探究了其协同固化机理。结果表明:生物酶联合水泥固化处理对淤泥强度有明显提升效果,其强度最高可提升73.8%,且生物酶掺量、种类、养护龄期影响其固化效果,但生物酶不和土体内矿物发生化学反应；生物酶和水泥的联合固化作用主要通过促进淤泥内阳离子交换作用,降低土体的电动电位,提高水泥水化产物的胶凝作用,促进活性黏土矿物的胶结以及催化包膜结构的形成实现；各类生物酶中,路易酶的固化效果最好,其水泥固化淤泥7 d无侧限抗压强度达378.8 kPa、黏聚力达307 kPa、内摩擦角达52.3°,相比水泥固化淤泥分别提高73.8%、33.2%和55.2%。 |
| 关键词: 生物酶 水泥土 淤泥固化 固化机理 无侧限抗压强度 |
| DOI：10.11918/202302052 |
| 分类号:TU411 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(52078464) |
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| Strength and solidification mechanism of cement solidified sludge improved with biological enzyme |
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LIN Chuxuan1,SUN Honglei1,2,WENG Zhenqi2
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(1.College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China; 2.College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310014, China）
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| Abstract: |
| In order to improve the strength of sludge, solve the problem of dredging sludge treatment in an environmentally friendly and efficient manner, biological enzymes combined with cement are used to solidify the sludge. Through the unconfined compressive strength test and direct shear test, the influence of biological enzymes on the strength of cement solidified sludge were preliminarily analyzed. The synergistic solidification mechanism was further explored by means of cation exchange capacity test (CEC),scanning electron microscope test (SEM), X-ray diffraction test (XRD), and infrared spectroscopy (FTIR). The results show that the combination of biological enzymes and cement solidification treatment has a significant improvement effect on the strength of sludge, with a maximum strength increase of 73.8%.Moreover, the amount, type and curing time of biological enzymes influenced its solidification effect, but biological enzymes do not react chemically with minerals in the soil. The combined solidification action of biological enzymes and cement is mainly achieved by promoting cation exchange in the sludge, reducing the electromotive potential of soil, improving the cementation of cement hydration products, promoting the cementation of active clay minerals, and catalytically forming the coating structure. Among all kinds of biological enzymes, Louis enzyme has the best curing effect. The unconfined compressive strength of Louis enzyme cement solidified sludge in 7 days can reach 378.8 kPa, and the cohesion and angle of internal friction can reach 307 kPa and 52.3°, which are increased to 73.8%,33.2% and 55.2% respectively higher than cement solidified sludge. |
| Key words: biological enzyme cement soil sludge solidification curing mechanism unconfined compressive strength |
