1. Rheological Properties

Slump change

An increase or decrease in pumping speed can affect the slump of concrete. Increasing the pump pressure or pump speed within a certain range reduces the difference in slump between the concrete before and after pumping, and has little effect on the rheological properties of the concrete.

On the contrary, a decrease in pump pressure or pump speed under pumping conditions has a significant impact on the rheological properties of concrete.

Uniformity

Excessive pumping speed may cause unstable flow of concrete in the pipeline, thereby affecting the uniformity of the concrete.

2. Concrete Strength

Reduced mixing resistance

During the process of pumping concrete, the mixing resistance of the concrete will be reduce due to long-distance transportation and impact during the process. If the pumping speed is too fast, this decrease may be more pronounced, thereby affecting the strength of the concrete.

Increased porosity

Changes in pumping speed may also affect the number of pores in concrete. Excessive pumping speed may introduce more air, leading to an increase in the number of air holes and a decrease in the compactness of the concrete, thereby affecting its strength.

3.Durability Of Concrete

Cracking and water seepage

Improper pumping speed may cause excessive internal stress in the concrete during pumping, which can lead to problems such as cracking and water seepage after long-terms use.

Wear and tear

Excessive pumping speed may lead to increased wear of concrete in the conveying pipeline, especially at bends or uneven inner walls. This kind of wear not only affects the efficiency of concrete transportation, but may also reduce the durability of concrete.

4. Construction Efficiency And Quality

Construction Efficiency

Appropriate pumping speed can improve construction efficiency and ensure that concrete is transported and poured within the specified time. However, excessive pumping speed may lead to quality control issues during the construction process.

Construction Quality

Changes in pumping speed require construction personnel to adjust and control according to actual situation. If the pumping speed is too fast or too slow, it may affect the stability and consistency of construction quality.

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In summary, the pumping speed has a significant impact on the quality of concrete. In actual construction, the appropriate pumping speed should be selected based on specific project requirements, concrete mix proportions, pipeline conditions, and the experience and technical level of construction personnel to ensure the quality of concrete.