Cement Consumption for Finished Prefabricated Houses

The cement consumption for finished prefabricated houses varies depending on the type, specifications of prefabricated components, and the strength grade of the concrete. Specific calculations are required based on different situations.

I. Cement Consumption for Prefabricated Panel Components

The cement consumption for prefabricated panels is usually calculated per meter of length or per square meter of area.

• Ordinary Prefabricated Panels: Approximately 30 jin (15 kg) of cement is required per meter of length. This data applies to prefabricated panels with a conventional thickness (e.g., 8-12 cm). If the thickness increases or the reinforcement density increases, the cement consumption may rise accordingly.
• Prefabricated Floor Slabs: The concrete consumption for prefabricated floor slabs is determined by their thickness and area. For example, a 100 mm thick floor slab requires 0.1 m³ of concrete per square meter, and the proportion of cement in the concrete needs to be determined based on the specific mix ratio. If using a C20 concrete mix ratio (with cement accounting for approximately 10%-15%), the cement consumption per square meter of floor slab is approximately 34.3 kg - 51.45 kg (calculated based on 0.1 m³ of concrete).

II. Cement Consumption for the Overall House Structure

The cement consumption for rural self-built houses or prefabricated residential buildings needs to be calculated comprehensively based on the concrete strength grade and the building area.

• Impact of Concrete Strength Grade: The cement consumption varies significantly for concretes of different strength grades. For example:
  • C15 Concrete: Requires 284 kg of cement per cubic meter;
  • C20 Concrete: Requires 343 kg of cement per cubic meter;
  • C25 Concrete: Requires 370 kg of cement per cubic meter;
  • C30 Concrete: Requires 400 kg of cement per cubic meter.
• Overall Consumption Estimation: Taking a three-story residential building with an area of 120 square meters as an example, if C20 concrete is used, the total concrete consumption is approximately 20 m³ (estimated at 0.19 m³ per square meter), resulting in a total cement consumption of approximately 6.84 tons. However, the actual consumption may fluctuate by 10%-20% due to design details (such as beam and column reinforcement, floor slab thickness) and construction techniques (such as concrete vibration compactness).

III. Key Influencing Factors

1. Component Type: The size and shape of prefabricated panels, floor slabs, walls, and other components directly affect the concrete consumption, thereby determining the cement demand.
2. Concrete Mix Ratio: The proportion of cement in the concrete (usually 10%-20%) needs to be adjusted according to the strength grade and construction requirements.
3. Construction Techniques: Losses during the concrete pouring process (such as formwork adsorption, vibration overflow) may result in actual consumption being higher than the theoretical value.

Summary: The cement consumption for prefabricated houses needs to be calculated comprehensively based on the specific component type, concrete strength grade, and construction conditions. It is recommended to conduct precise calculations in conjunction with design drawings and local construction specifications.