Inspection Report on Cement Prefabricated Houses

The inspection report on cement prefabricated houses typically covers core aspects such as material strength, structural stability, fire resistance, durability, and environmental indicators to ensure that the quality and safety of the houses meet national standards.

1. Material Strength Testing
   The focus is on the quality of raw materials such as cement, steel bars, and aggregates. Cement must comply with the requirements of GB/T 17671-2021 'Test Method for Strength of Cement Mortar', with its strength grade verified through compression and flexural tests. Steel bars must be tested for yield strength, tensile strength, and elongation to ensure compliance with design specifications. Aggregates need to be evaluated for particle size distribution and silt content to avoid affecting concrete performance. Additionally, concrete strength testing is crucial, typically involving sampling components using the rebound method or core drilling method to ensure they meet the designed strength grade.

2. Structural Stability Assessment
   Mechanical tests are conducted to evaluate the overall load-bearing capacity and wind and earthquake resistance of the house. For example, static load tests are performed on prefabricated beams and columns to verify whether their deformation is within allowable limits. By simulating seismic wave input, the structural response under earthquake conditions is detected to ensure compliance with seismic fortification requirements. Furthermore, dimensional deviation testing can correct installation errors of components, preventing abnormal structural stress due to excessive geometric deviations.

3. Fire Resistance Evaluation
   Based on GB 8624-2012 'Classification of Burning Behavior of Building Materials and Products', combustion tests are carried out on the building envelope (such as exterior wall panels and roof panels) to determine their fire resistance ratings (e.g., Class A non-combustible, Class B1 flame-retardant). At the same time, the setting of fire barriers is inspected to ensure compliance with regulations, effectively preventing the spread of fire in case of a fire.

4. Durability Testing
   The anti-aging and anti-corrosion capabilities of the house during long-term use are evaluated. For example, salt spray tests are conducted to detect the corrosion resistance of metal components, or acid rain environments are simulated to test the weather resistance of exterior wall materials. Carbonation depth testing is performed on concrete components to assess their carbonation resistance, ensuring that the structural service life meets design requirements.

5. Environmental Indicator Testing
   This covers the release of harmful substances, noise control, and thermal insulation performance. According to GB 50325-2020 'Indoor Environmental Pollution Control Specification for Civil Building Engineering', the concentrations of volatile organic compounds such as formaldehyde and benzene indoors are tested for compliance. Thermal transmittance tests are conducted to verify the thermal insulation performance of walls, ensuring compliance with energy-saving standards. At the same time, the airtightness of doors and windows is tested to reduce noise intrusion and enhance living comfort.