It is mainly due to its poor weather resistance. Under the influence of natural quantity, the stone is prone to cracks, and the slightest degree is the expansion of micro-cracks, blurry edges and so on. Sesame ash stone itself has cracks, which often coexist with natural, chemical, and physical damage such as wind erosion, acid rain erosion, and frost damage. There may also be cracks between the cement and the cement. This cracking phenomenon is based on the temperature difference. The expansion coefficient of stone and cement mortar is different. The temperature difference causes uneven expansion, resulting in cracks between the stone and cement. Over time it will cause cracking.