Testing methods and standards for the flatness of concrete floors

Detection method

- Ruler and feeler gauge detection: This is the most commonly used method. Place the ruler vertically on the ground, and then use the feeler gauge to measure the size of the gap between the ruler and the ground. Usually multiple measuring points are selected on the ground, such as one point every 2-3 meters, and the flatness of different positions is detected and the data is recorded.
- Level detection: Use the level to establish a horizontal reference plane, measure the elevation difference of different points on the ground relative to the reference plane, and then calculate the flatness of the ground. This method has high accuracy and is suitable for floors with high flatness requirements, such as industrial plants, precision instrument workshops, etc.
- Laser leveling instrument detection: Use laser technology to measure the flatness of the ground. The instrument emits a laser beam, receives reflected light through the sensor, automatically measures the ups and downs of the ground, and directly obtains the flatness data. This method is efficient and accurate, and can quickly obtain a large amount of measurement data, but the equipment cost is high.

Testing standards

- General industrial and civil building floors: According to the "Construction Quality Acceptance Code for Building Floor Engineering" (GB 50209 - 2010), the flatness deviation of cement mortar floors and concrete surface floors is 5mm.
- Industrial plant floors: For industrial plants with special requirements, such as electronic plants, food processing workshops, etc., the ground flatness requirements may be higher. For example, the flatness requirements of electronic plant floors may reach 2-3mm to meet the installation and operation requirements of high-precision equipment.
- Outdoor concrete floors: Such as roads, squares, etc., usually implement the "Urban Road Engineering Construction and Quality Acceptance Code" (CJJ 1-2008) and other relevant standards. For cement concrete pavement, the flatness is tested with a 3m ruler, and the allowable deviation is 7mm.

In actual testing, the appropriate testing method and acceptance standard should be determined according to the design requirements of the specific project and relevant specifications and standards to ensure that the flatness of the concrete floor meets the use requirements.

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