The technical specifications for impact compaction of pipe impact rollers often refer to the YCT25 impact roller as an example. Many examples of impact compaction construction also list the specific number of impact compaction passes of the YCT25 impact roller. However, the impact compaction standards of the YCT25 impact roller are not determined by the specific number of impact compaction passes.

It should be noted that there are inherent differences in the nature of the foundation in different regions, as well as factors such as environment, soil quality, moisture, and road construction level. In addition, differences in the specifications and models of impact rollers, rolling speed, and other factors can also affect the impact rolling effect. It is obviously unscientific to measure the impact rolling effect or determine the impact rolling standard based on the number of times of impact rolling.

National Standard GB_ The T 25626-2010 impact roller clearly states in the content 1. Scope data that "the road section with an average settlement of ≤ 30mm after 20 rounds of impact compaction in the roadbed reinforcement and supplementary compaction test section" should not be used for impact compaction again. This is a specific explanation for the impact compaction effect of the impact roller to meet the standard.

After 10 or 15 rounds of impact rolling with YCT25 impact roller, a section is set every 20 meters, with 5 measuring points set for each section to collect data. After 5 more rounds of impact rolling, collect and compare the data again. If the average settlement is ≤ 30mm, it is considered to meet the standard. If it does not meet the standard, continue to add 5 more rounds of impact rolling, and so on until it meets the standard.

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