Conservation method of relics soil based on carbonization principle
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摘要: 土遗址修复后表层易开裂脱落，且与旧遗址相比外观质量欠佳。依托开封城墙遗址修复工程，针对新修复土遗址常见病害，结合机械施工要求，对仿遗址土添加2%浓度甲基硅酸钠（防水剂）后，基于石灰碳化原理，对不同石灰掺量、CO2浓度和养护时间的仿遗址土试样进行力学与水理性能对比试验。试验研究结果表明：（1）添加石灰和甲基硅酸钠以后土样的水稳定性与崩解性能均更加理想，CO2浓度为5%条件下甲基硅酸钠与石灰基本完成了碳化，养护24 h可达到较好的毛细吸水性能，养护72 h时可达到较好的耐崩解性能；（2）增加石灰掺量、CO2浓度和养护时间，可使试样碳化后产生的CaCO3增多，从而提高其抗剪强度和抗压强度，且CO2浓度的贡献大于养护时间；（3）当空气中CO2浓度为15%时，养护时间超过72 h后试样抗压强度增长缓慢趋于稳定，即石灰与空气中充足的CO2发生充分反应（约72 h）之后，试样抗压强度接近最佳。研究成果可为土遗址保护提供新思路。Abstract: The phenomenon of surface cracking and falling off of newly restored soil sites, results in inferior appearance quality compared to old sites. In response to the diseases of newly restored soil sites, combined with the requirements of mechanical construction, a 2% concentration of sodium methylsilicate (waterproofing agent) was added to the simulated site soil. Based on the principle of lime carbonation, mechanical and hydraulic performance comparative tests were conducted on simulated site soil samples with different lime parameters, CO2 concentrations, and curing times. The experimental research results show that: (1) After adding lime and sodium methylsilicate, the water stability and disintegration performance of the soil sample are more ideal. Under the condition of CO2 concentration of 5%, sodium methylsilicate and lime have basically completed carbonization. After 24 hours of curing, good capillary water absorption performance can be achieved, and good disintegration resistance can be achieved after 72 hours of curing. (2) Increasing the lime content, CO2 concentration, and curing time can increase the amount of CaCO3 produced after sample carbonization, thereby improving its shear strength and compressive strength, and the contribution of CO2 concentration is greater than that of curing time. (3) When the concentration of CO2 in the air is 15%, the compressive strength of the sample increases slowly and tends to stabilize after a curing time of more than 72 hours. That is, after sufficient reaction between lime and sufficient CO2 in the air (about 72 hours), the compressive strength of the sample approaches the optimal level. This research could provide new ideas for the protection of soil sites.
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Key words:
- imitative site soil /
- carbonization principle /
- water physical property /
- mechanical property /
- pH value
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表 2 养护设计
CO2浓度/% 养护时间/h 6 12 24 48 72 120 5 B1C1 B1C2 B1C3 B1C4 B1C5 B1C6 10 B2C1 B2C2 B2C3 B2C4 B2C5 B2C6 15 B3C1 B3C2 B3C3 B3C4 B3C5 B3C6 
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