Λεπτομέρειες βιβλιογραφικής εγγραφής
| Τίτλος: |
不同温度环境下 EICP 固砂及优化试验研究. (Chinese) |
| Alternate Title: |
Experimental study on sand solidification and optimization of EICP in different temperature environments. (English) |
| Συγγραφείς: |
王恒星, 缪林昌, 孙潇昊, 吴林玉, 范广才 |
| Πηγή: |
Journal of Southeast University / Dongnan Daxue Xuebao; Jul2022, Vol. 52 Issue 4, p712-719, 8p |
| Abstract (English): |
To improve the sand solidification effects of biomineralization technology at different temperatures, a cost-effective plant urease was selected for the study of sand consolidation based on enzyme-induced calcium carbonate precipitation(EICP). Firstly, the influence of temperature environment on urease stability was analyzed. Then, the effects of the temperature, the urease content and the pH value on the formation rate of calcium carbonate were studied by calcification tests. Finally, the curing effects of sand columns were evaluated through testing the sonic value, the unconfined compressive strength, and the content of calcium carbonate. The results show that the urease begins to lose its activity gradually when the temperature is higher than 55 ℃. The increase of the urease activity is beneficial to improve the conversion rate of calcium carbonate. Inhomogeneous curing occurs easily when the urease activity is higher than 10 mmol/(L·min). Adjusting the initial solution pH to 4 can improve the sand solidification effect of EICP. Controlling the urease concentration and the initial pH of the solution at different temperatures can modulate the urease activity and improve the curing effect of EICP. [ABSTRACT FROM AUTHOR] |
| Abstract (Chinese): |
为了在不同温度下实现生物矿化技术对土体的改良,选取高性价比的植物脲酶进行酶诱导碳酸钙沉淀 (EICP) 固砂研究.首先,分析温度环境对植物脲酶热稳定性的影响.然后,利用钙化试验研究温度、脲酶质量分数和pH值对碳酸钙生成速率的影响.最后,测试砂柱的声时值、无侧限抗压强度和碳酸钙质量分数,以评价固砂效果.结果表明,当温度高于 55 ℃ 时脲酶会逐渐失活,提高脲酶活性有利于提高 EICP 碳酸钙的转换率.当脲酶活性高于 10 mmol/(L·min) 时易发生固砂效果不均匀的现象,控制溶液初始pH为4可以提高 EICP 的固砂效果.在不同温度下控制脲酶质量分数和溶液初始 pH,可以调节脲酶活性,并优化 EICP 的固砂效果. [ABSTRACT FROM AUTHOR] |
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| Βάση Δεδομένων: |
Complementary Index |