Yue Jianwei, Zhang Yiang, Li Peng, Zhang Jing, Huang Xuanjia, Yue Yang, Han Zhiguang
School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, China.
Key Laboratory for Restoration and Safety Evaluation of Immovable Cultural Relics in Kaifeng City, School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, China.
Materials (Basel). 2022 Jun 6;15(11):4034. doi: 10.3390/ma15114034.
The reciprocating action of the external environment gradually reduces the mechanical properties and water stability of original heritage buildings, resulting in the gradual loss of their cultural value. In this paper, the adobe for the construction of raw soil and cultural relics in western Henan is taken as the research object. The local plain soil is used as the raw material, and the adobe samples are prepared with modified materials such as quicklime and sodium methyl silicate, in order to improve its mechanical properties and water stability. The degree of correlation between the compressive strength, capillary water absorption, pH value, particle size distribution, and the electrical conductivity of modified raw adobe, as well as the modification mechanism of the microstructure, was studied. The results show that the addition of quicklime and sodium methyl silicate can enhance the compressive strength and water resistance of the modified raw adobe, and the optimum dosage is 1.5% sodium methyl silicate; with the increase of the curing age, the compressive strength of the single-mixed quicklime sample, the single mixed sodium methyl silicate samples, and the composite sample were increased by 1.94 times, 12.6 times and 2.61 times, respectively, compared with the plain soil samples, and with the increase of compressive strength, the pH, conductivity and capillary water absorption of the samples decreased continuously. It is evident from the particle gradation test and SEM images that the internal pores of the samples in the modified group become smaller, and the particle structure of the sample doped with sodium methyl silicate is the densest. The results of the study provide support for the restoration of the soil and cultural-relic buildings.
外部环境的往复作用逐渐降低了原有 heritage 建筑的力学性能和水稳定性，导致其文化价值逐渐丧失。本文以豫西地区用于建造生土及文物的土坯为研究对象。以当地素土为原料，用生石灰和甲基硅酸钠等改性材料制备土坯样品，以提高其力学性能和水稳定性。研究了改性生土坯的抗压强度、毛细吸水率、pH 值、粒度分布和电导率之间的相关程度，以及微观结构的改性机理。结果表明，添加生石灰和甲基硅酸钠可提高改性生土坯的抗压强度和耐水性，最佳用量为甲基硅酸钠 1.5%；随着养护龄期的增加，单掺生石灰样品、单掺甲基硅酸钠样品和复合样品的抗压强度分别比素土样品提高了 1.94 倍、12.6 倍和 2.61 倍，且随着抗压强度的提高，样品的 pH 值、电导率和毛细吸水率不断降低。从颗粒级配试验和 SEM 图像可以明显看出，改性组样品的内部孔隙变小，掺甲基硅酸钠样品的颗粒结构最致密。研究结果为土遗址及文物建筑的修复提供了支撑。
