Crack filling can effectively prevent further development of cracks and leakage of rainwater, enabling kiln sites to be better preserved. In order to select suitable grouting materials for crack filling in kilns with moisture problems, we conducted a study on modification of soils from four sites on the Maritime Silk Road in Zhejiang and Fujian provinces. We used calcined ginger nuts, calcined Aga soil and oyster ash. We tested compressive strengths, flexural strengths and shrinkage rates of the modified grouting materials at different ages, as well as their changes of mechanical properties before and after temperature and humidity cycle tests, freezing and thawing cycle tests, water stability tests, stability tests and alkali resistance tests. The result shows that all three of the types of lime materials demonstrate good weathering resistance, but the oyster ash-modified samples are characterized by having relatively weaker resistance to freezing and thawing, lower aging strengths and larger shrinkage deformations. In contrast, the samples modified with calcined ginger nuts demonstrate their higher aging strength, smaller shrinkage deformation, as well as resistance to weathering. Therefore, it is suggested that calcined ginger nuts be used in grouting materials for crack filling in these four kiln sites. The related research results have a practical significance in terms of the selection of grouting materials for crack filling.