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MessagePosté le: 30/11/2016 07:23:54    Sujet du message: Roller - related knowledge Répondre en citant

Resulting in anodic deposition in the underlying foundation, a small material "floating" in the surface layer. This stratification results in uneven gradation of the gradation of the road material, loosening of the foundation surface, crushing of the aggregates, and of course the poor quality of the foundation. This phenomenon is also known as the term "over compaction" (but it is by no means "too solid").
Increase the excitation frequency
Excitation force = eccentricity force distance �� (2 �� �� �� frequency) 2
As a result of the square factor in the formula, the exciting force is thus greatly improved. But too high frequency will deviate greatly from the natural frequency of soil, affecting the compaction effect.
Increase the eccentric mass
This will cause the eccentric torque increases caused by amplitude increases, too much amplitude will also cause "over-compaction" phenomenon. In order to control the amplitude increase, it is necessary to increase the wheel weight, but this will cause the wheel and the weight of the wheel frame imbalance in the wheel load is fixed, the wheel weight, roller frame must be light, Wheel jump range, in other words, the pressure wheel frame can not suppress the wheel, the compaction effect of course not good, but also cause the machine vibration, affecting mechanical life, speed up the driver's fatigue.
The larger the amplitude, the better
Under normal circumstances, the greater the amplitude the greater the depth of compaction. But the amplitude is not the bigger the better. When the amplitude is too large, the same will be a "over-compaction" phenomenon, resulting in particle size distribution disorders, the basis of loose surface, aggregate is crushed. Under normal circumstances, the compacted subgrade amplitude of 1.4 ~ 2.0mm, compaction sub-base amplitude of 0.8 ~ 2.0mm, compacted road surface amplitude of 0.4 ~ 0.8mm as well.
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