Sichuan Rural Prefabricated Slab Houses

Sichuan rural prefabricated slab houses have many characteristics in terms of policies, performance, and application scenarios. Here is a detailed introduction:

Policy Situation

The country began to phase out prefabricated slabs as early as 2002, and Sichuan has prohibited the use of prefabricated concrete slabs for floor slabs since 2005. The focus of relevant policies in 2026 will be on graded treatment, dividing houses into four grades based on their safety levels. Houses with Grade A or B structures that are barely acceptable will be rectified, such as renovating exterior walls and replacing water and electricity pipelines. Houses with Grade C local structural hazards will usually be arranged for seismic reinforcement first. If it is technically impossible to reinforce or reinforcement is meaningless, they may apply for demolition and reconstruction. Grade D houses must be evacuated immediately and are usually included in urban renewal or demolition projects for handling.

Performance Characteristics

• Extremely poor seismic performance: The floor slabs of prefabricated slab houses are composed of multiple prefabricated slabs spliced together, with weak connections between the slabs. When an earthquake occurs, each slab acts independently and is prone to disintegration, suffering severe damage in major earthquakes.
• Limited service life: Manufacturers claim that prefabricated slabs can be used for 50 years, but in actual normal use, it is quite good if they can be used for 20 years without major problems. In rainy southern regions, problems such as water seepage, steel bar corrosion, and concrete spalling may occur in about ten years.
• Water leakage and cracking issues: The gaps between prefabricated slabs are filled with cement mortar. Over time, due to the effects of thermal expansion and contraction as well as foundation settlement, cracks are inevitable at the joints, leading to water leakage.

Application Scenarios

In places like Deyang and Guangyuan in Sichuan, many villagers use prefabricated slabs for floor slabs when building new houses. Their load-bearing capacity can reach 200 - 300 kg/㎡, which can meet daily living needs. In addition, prefabricated slabs are also suitable for small-scale municipal engineering projects, such as community fences, rural road side ditches, and temporary work sheds. Small prefabricated components for mountain bridge culverts, such as cover slabs and stop blocks, also often use prefabricated slabs because of their corrosion resistance and up-to-standard strength, which are suitable for the geological conditions of Sichuan with many mountains and waters.

Key Points for Purchase and Use

Look for manufacturers with a Production License and a Quality Inspection Report to avoid "three-no products" (products without a production license, quality inspection report, and product certification). When inspecting the appearance, high-quality prefabricated slabs have a flat surface, no cracks or honeycombs, no damaged edges, and uniform thickness (commonly 10 - 15 cm, which can be customized according to load-bearing requirements). In rainy Sichuan, prefabricated slabs stacked outdoors for more than three months are prone to moisture absorption and alkali efflorescence. It is recommended to store them indoors or cover them with waterproof cloth to avoid direct sunlight and rain immersion.

Maintenance Suggestions

If your old house is built with prefabricated slabs, be sure to conduct regular inspections. Focus on checking for cracks at the joints of the floor slabs, signs of water seepage on the walls, and corrosion of the beams and columns. If any problems are found, seek professional personnel for reinforcement and repair in a timely manner.