Abstract
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 °C. 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.
| Translated title of the contribution | Experimental study on sand solidification and optimization of EICP in different temperature environments |
|---|---|
| Original language | Chinese (Simplified) |
| Pages (from-to) | 712-719 |
| Number of pages | 8 |
| Journal | Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) |
| Volume | 52 |
| Issue number | 4 |
| DOIs | |
| Publication status | Published - 1 Jul 2022 |
| Externally published | Yes |
Keywords
- enzyme induced carbonate precipitation (EICP)
- low pH
- plant urease
- sand solidification
- temperature
- uniformity
ASJC Scopus subject areas
- General Engineering