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| Strength test and microscopic mechanism analysis of tung oil sticky rice-lime composite mortar |
Xiaowu TANG1,2( ),Qingqing XIANG1,2,Minliang FEI3,Keyi LI1,2,Guoping SUN4,Yue YU5 |
1. Research Center of Coastal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
2. Engineering Research Center of Urban Underground Development of Zhejiang Province, Hangzhou 310058, China
3. Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China
4. Zhejiang Institute of Cultural Relics and Archaeology, Hangzhou 310014, China
5. School of Public Administration and Policy, Renmin University of China, Beijing 100086, China |
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Abstract Orthogonal design was used to make composite mortar samples with different mass fraction ratios (moisture : tung oil : sticky rice : lime) for the tamping repair of earthen ruins. After one full year of on-site maintenance of the site, the reinforcement effects of tung oil, sticky rice pulp and lime on silt were evaluated by two mechanical indexes of shear strength, i. e. cohesion and internal friction angle, to obtain the optimal mass fraction ratios. Results showed that when the mass fraction ratio was 18 : 5 : 12 : 10, the cohesion was the largest. When the mass fraction ratio was 9 : 3 : 5 : 5, the internal friction angle was the largest. The intensity growth of the two groups of tung oil sticky rice-lime composite mortar was verified within 28 days, and the synergistic improvement mechanism of composite mortar was explored by scanning electron microscope, Fourier transform infrared spectroscopy and X-ray diffractometer. At the 28-day curing age, in terms of cohesion, the cohesion of the optimal mass fraction ratio specimen achieved 98.6% of the cohesion of the highest combination in the orthogonal experiment at the 1-year curing age; in terms of internal friction angle, the internal friction angle of the optimal mass fraction ratio specimen achieved 97.8% of the internal friction angle of the highest combination in the orthogonal experiment at the 1-year curing age. The results were applied locally to the soil of the site with stripping disease, and the results showed that the long-term restoration effect was good, and could provide some reference for the on-site restoration and protection of the soil site in the humid environment.
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Received: 06 January 2024
Published: 10 March 2025
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| Fund: 浙江省文物保护科技资助项目（2023006）. |
桐油糯米复合灰浆强度试验及微观机理分析
为了土遗址的夯土修复，采用正交设计制作不同质量分数比（水∶桐油∶糯米浆∶石灰）的复合灰浆试样.经1 a遗址现场养护，以抗剪强度的2个力学指标（黏聚力、内摩擦角）评价桐油、糯米浆、石灰对粉土的加固效果，以获得最优质量分数比. 结果表明：当复合灰浆质量分数比为18∶5∶12∶10时，黏聚力最大；当质量分数比为9∶3∶5∶5时，内摩擦角最大. 对2组最优质量分数比的桐油糯米复合灰浆开展28 d内强度增长验证，利用扫描电子显微镜、傅里叶变换红外光谱、X射线衍射仪探究复合灰浆的协同改良机理. 2组复合灰浆在28 d龄期中，在黏聚力方面，最优质量分数比试样的黏聚力达到了正交试验最高组合1a龄期的98.6%；在内摩擦角方面，最优质量分数比试样的内摩擦角达到了正交试验最高组合1a龄期的97.8%. 结果被应用于发生剥离病害的遗址土体，获得了良好的加固效果，能为潮湿环境土遗址现场修复和保护提供参考.
关键词：
复合灰浆,
抗剪强度,
正交试验,
改良机理,
微观机制分析
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