Prefabricated Concrete Slabs for Houses in Wanyuan City

The following is information about prefabricated concrete slabs for houses in Wanyuan City:

Production History and Background
The specific starting year of the production of prefabricated concrete slabs in Wanyuan City, Sichuan Province, is not clearly recorded. However, as a mature building material, the technology and craftsmanship of prefabricated concrete slabs had been widely popularized by the mid-to-late 20th century. During the 1970s and 1980s, especially in the early 1980s, prefabricated concrete slab walls were extensively used in brick-and-concrete structural buildings due to their high construction efficiency and low cost. By being prefabricated in advance and directly installed, they significantly shortened the time required for on-site red brick masonry. During this period, prefabricated concrete slab houses were particularly popular in rural areas because they used less steel, were inexpensive, and had simple construction techniques, making them a common choice for farmers' self-built houses.

Structural Types and Specifications
Prefabricated concrete slab walls are mainly made of Portland cement and steel reinforcement frames, and are prefabricated into panel structures using molds, available in solid and hollow types. Hollow prefabricated slabs further expanded their application range by reducing weight and saving material costs. Their standard specifications include a maximum span of 4.2 meters, widths mostly of 500mm or 600mm, and thicknesses primarily of 120mm and 150mm. This standardized design facilitates transportation and installation, but is limited by size, making it difficult to meet the needs of large-span buildings.

Application Limitations and Reasons for Obsolescence
Although prefabricated concrete slabs were once widely used, their defects gradually became apparent:

• Insufficient safety: The connection between the prefabricated slabs and the main structure is weak, making them prone to house collapse under external forces such as earthquakes, posing significant safety hazards.
• Poor durability: The use of inferior materials or improper construction leads to a shortened service life, with cracks easily forming at the joints between slabs, causing problems such as water leakage and poor sound insulation.
• Performance defects: They have poor thermal insulation, insufficient structural stability, and weak load-bearing capacity, making it difficult to meet the safety and comfort requirements of modern buildings.
  Currently, prefabricated concrete slab walls have been banned or rarely used in the construction field, with cast-in-place slabs becoming the mainstream alternative due to their good integrity and strong earthquake resistance.

Derivative Products and Modern Applications
Since the 2010s, cement fence panels have emerged in rural and township areas in China, mainly used for courtyards, farms, and temporary engineering fences. These panels inherit the low-cost and high-efficiency characteristics of prefabricated concrete slabs, while improving their freeze resistance and impact resistance through optimized formulations and processes, making them an economical choice for temporary or low-demand scenarios.