| 摘要: |
| 采用扫描电镜、X射线衍射等研究了脲酶诱导碳酸钙沉淀（EICP）技术对三合土性能的影响.结果表明：随着豆粉质量浓度的增大，脲酶活性呈近似线性增长，其最适宜的环境pH值为3~11，当环境pH值为12时，脲酶活性急剧下降；与三合土空白样相比，脲酶改性三合土14 d碳化深度提高了94%~112%，28 d抗压强度提高了68.0%~103.0%，耐候性提高了150%~200%，60 d表面硬度提高了15.0%~18.3%；三合土空白样产生的碳酸钙晶体松散，脲酶的掺入使三合土中出现了长条状晶体和团簇状晶体，且随着豆粉质量浓度的增大，团簇状晶体相对增多，长条状晶体相对减少，使三合土的各项性能逐渐提高. |
| 关键词: 古建筑修复 三合土 脲酶诱导碳酸钙沉淀 改良 性能 |
| DOI：10.3969/j.issn.1007-9629.2022.08.012 |
| 分类号:TU52 |
| 基金项目:国家自然科学基金资助项目（51608236） |
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| Performance of Traditional Tabia Improved by Enzyme Induced Calcite Precipitation Technology |
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DONG Jin, LIU Xiaobin
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School of History Culture and Tourism， Jiangsu Normal University， Xuzhou 221116， China
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| Abstract: |
| The effect of enzyme induced calcite precipitation （EICP） technology on the properties of tabia was studied by means of scanning electron microscope and X-ray diffractometry. The results show that urease activity increases approximately linearly with increasing of soybean powder mass concentration， and its optimum pH value is 3-11. When the pH value is 12， the activity drops sharply. Compared with the control sample of tabia， the carbonization speed of tabia modified with urease increases by 94%-112% in 14 days， the compressive strength increases by 68%-103% in 28 days， the weather resistance increases by 150%-200%， the surface hardness increases by 15.0%-18.3% in 60 days. The calcium carbonate crystals produced by the control sample of tabia are loose. After adding urease， long-strip crystals and cluster-like crystals appear in the tabia， and with the increase of soybean powder mass concentration， the cluster-like crystals increase relatively， and the long-strip crystals decrease relatively， the performance of tabia also gradually improves. |
| Key words: ancient building restoration tabia enzyme induced calcite precipitation improve performance |
