Large Size of Prefabricated House Slabs

The size of prefabricated house slabs is relatively large, with common dimensions around 3300mm×600mm. The floor slab of a 10-square-meter bedroom is typically assembled from five or six prefabricated slabs.

Dimensions and Assembly Methods of Prefabricated Slabs

Prefabricated slabs are commonly used floor components in early construction. Their standard dimensions are usually 3300mm in length, 600mm in width, and the thickness ranges from 80mm to 150mm depending on design requirements. Taking a 10-square-meter bedroom as an example, if the room's width is 3.3 meters (matching the length of the prefabricated slab) and the depth is about 3 meters, the floor area needs to cover approximately 9.9 square meters. Calculated based on the area of a single prefabricated slab (3.3m×0.6m = 1.98 square meters), five or six slabs can meet the demand, with the specific quantity depending on the room's shape and assembly method. When assembling, gaps should be reserved and filled with cement mortar or fine aggregate concrete to ensure structural integrity.

Limitations of Prefabricated Slabs

1. Poor Seismic Performance: Prefabricated slabs are prefabricated components, and their connection to the main structure (such as beams and walls) relies on reserved reinforcement and cast-in-place nodes, resulting in relatively weak integrity. Under seismic action, the nodes are prone to damage, leading to slab detachment or collapse. Therefore, they are not suitable for high-intensity earthquake zones.
2. Short Service Life: Prefabricated slabs are made of concrete and are prone to cracking under long-term temperature changes and load effects. If waterproofing is not properly handled, rainwater infiltration can accelerate steel reinforcement corrosion, further reducing structural durability. The design life is usually shorter than that of cast-in-place floors.
3. Prone to Leakage and Cracking: The assembly gaps are weak points in waterproofing. If not strictly treated during construction (such as not installing waterstops or not filling gaps properly), leakage may occur later. In addition, the prefabricated slabs themselves may develop cracks due to concrete shrinkage, affecting usability.

Alternative Solutions in Modern Construction

Currently, cast-in-place floors have become the mainstream choice. They are formed by on-site formwork erection, steel reinforcement binding, and concrete pouring, resulting in superior seismic performance, durability, and waterproofing compared to prefabricated slabs. For existing prefabricated slab buildings requiring renovation or reinforcement, methods such as粘贴碳纤维布 (carbon fiber sheet pasting) and adding steel structure mezzanines can be adopted to enhance safety.