Causes of Cracks in Prefabricated House Slabs
The main causes of cracks in prefabricated house slabs include excessive temporary stacking loads, as well as factors such as natural aging, house renovation or alteration, overloading, and construction activities at adjacent building sites.
Excessive Temporary Stacking Loads: This is a direct and common cause of cracks in prefabricated house slabs. When the temporary stacking load on a slab exceeds its designed load-bearing capacity, the floor slab may undergo brittle fracture or even collapse due to its inability to withstand the excessive pressure. This situation is particularly common during renovation, heavy lifting, or temporary storage of large quantities of materials. For example, during renovation, if a large amount of building materials such as cement and sand are concentrated on a single prefabricated slab without taking measures to distribute the load, it may lead to cracking of the slab due to uneven stress distribution.
Factors such as Natural Aging, House Renovation or Alteration, Overloading, and Construction Activities at Adjacent Building Sites: Houses are subject to various influences over long-term use, which may lead to cracks in prefabricated slabs. Natural aging is an inevitable process. Over time, the material properties of prefabricated slabs gradually decline, such as reduced concrete strength and steel reinforcement corrosion, all of which weaken the load-bearing capacity of the slabs and increase the risk of crack formation. During house renovation or alteration, improper operations, such as removing load-bearing walls or altering the house structure, may disrupt the load-bearing balance of the slabs, leading to crack formation. Overloading, which involves placing heavy objects on the slabs that exceed their designed load-bearing capacity for extended periods, also accelerates slab damage and crack formation. Additionally, construction activities at adjacent building sites, such as pile driving and excavation, may generate vibrations and stress waves that can be transmitted through the soil to the house foundation, thereby affecting the stability of the slabs and causing cracks to appear.
