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Legenda soseske
Pridružen/-a: 27.09. 2016, 06:54
Prispevkov: 1069
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 Objavljeno: 30 Nov 2016 05:14 Naslov sporočila: Roller - related knowledge |
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Rolling is rolling with a certain weight of the roller slowly layer, with the static pressure to be pressed layer to obtain permanent residual deformation. With the increasing number of rolling, the density of the material increases, while the permanent residual deformation decreases, and finally the actual residual deformation is equal to zero. In order to further improve the density of the pressed material, it is necessary to use a heavy roller to roll.
Rolling: cycle for a long time, the material stress state of the speed of change is not, but the larger the stress
Vibration is the use of fixed in a certain quality of the object produced by high-frequency vibration of the vibrator to the pressed material to produce close to its own natural frequency vibration vibration, so that the material has great mobility, so that Particles close to the density increase, the material compaction. Vibration: the surface stress is not, the process time is short, the loading frequency, can be widely used in small viscosity materials, such as sand, cement concrete mixture
Compaction is the use of a large mass of large objects, from a certain height on the cyclical free fall to produce impact, the material compaction. Compaction: The stress produced by the material changes very quickly. In compaction of soil, especially for the cohesive soil has better compaction effect
Factors that affect compaction:
Pressure material properties, water content, particle size distribution, rolling speed, roller machine quality, vibration parameters, rolling times and so on. ? How to improve the compaction effect:
Soil compaction, compaction equipment, the frequency of vibration should be higher than the natural frequency of the soil.
There are two types of wheel rollers and tire rollers:
Optical wheel roller: Because of its simple structure, easy maintenance, and long life, and has been widely used. It is considered one of the optional equipment for compacting asphalt pavement. But its compaction effect can not be compared with the rapid development of vibration in recent years up the roller.
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