Study On Vibration Liquefaction Performance Of Low-slump Pavement Concrete

Fresh low-slump pavement concrete of slipform paving is a thick mix of solid, liquid and gas, whose vibration liquefaction performance affects construction efficiency of slipform paver and compaction of vibrated concrete. The purpose of this paper is to research vibration liquefaction performance of fresh low-slump pavement concrete based on vibration energy transmitted. It bases the vibration acceleration, vibration viscosity coefficient, concrete strength and durability on assessment. The aim is to search concrete mix that has optimum vibration liquefaction performance and best fits slipform paving.Based on concrete vibrating table of the frequency-converter in the indoor laboratory, it researches how frequency, amplitude and vibration time affect fresh concrete vibration liquefaction performance, to normalize parameter of vibrating table used in the experiment of slipform paving concrete. It use the virtual value of vibration acceleration to evaluate how concrete mix affects vibration liquefaction performance based on volumetric method.Based on formula of vibration viscosity coefficient, it puts forward new understanding and test method to acquire vibration viscosity coefficient at different moments. Based on high-frequency vibrator in the indoor laboratory, it uses vibration viscosity coefficient to evaluate how concrete mix affects vibration liquefaction performance so that it can acquire the relationship of vibration liquefaction performance and distance between table tennis and vibrator. Finally it analyses to acquire relationship of vibration acceleration and vibration viscosity coefficient that are the assessments of vibration liquefaction performance.Based on a small slipform paver, it selects concrete mix to research vibration liquefaction performance of fresh low-slump pavement concrete under the action of moving load. In addition, it can acquire transfer rule and attenuation law of vibration energy.