Indoor grinding and forming instrument of bituminous mixture test specimen and forming control method thereof

Abstract

The invention relates to an indoor grinding and forming instrument of a bituminous mixture test specimen and a forming control method thereof. The forming instrument comprises a rack, a grinding wheel, a mould and a mould drive device, and also comprises a grinding wheel drive device; the device mainly comprises a first reducing gear, a grinding wheel support, a hydraulic ram, a first guide rail and a driving chain; the mould drive device mainly comprises a mould driving support, a second guide rail, a second reducing gear, a speed reducing elevator mechanism, an elevating platform and a horizontal screw; the grinding wheel is arranged on the grinding wheel support, the grinding wheel support is connected with the first reducing gear, the mould drive support is connected with the second reducing gear through the horizontal screw, and the speed reducing elevator mechanism is fixed on the mould driving support and connected with the elevating platform. The method comprises the steps of:setting parameters, judging whether a starting position is reached or not, applying a grinding force, comparing a pressure value with a set value, grinding with the grinding wheel, judging whether one round of grinding is ended or not, and the like. The grinding and forming instrument has the advantages of high simulation degree, high automation degree and wide application range.

Description

Technical field [0001] The invention relates to test equipment for pavement paving materials, in particular to an indoor rolling molding instrument for asphalt mixture test pieces and a molding control method thereof. Background technique [0002] Due to the viscoelastic characteristics of asphalt mixtures, asphalt pavements will undergo permanent deformation (rutting) under repeated loads. In recent years, rutting damage has become one of the more prominent early damage modes of asphalt pavement. Rutting will not only increase the unevenness of the road, but also cause the drift of driving vehicles in the rainy season, and the slippage of driving vehicles in the freezing season. These will significantly affect the quality of road services and endanger people's lives and property. In order to control the rutting of the asphalt pavement, the allowable rutting inspection will be considered during the design of the asphalt pavement structure. At present, the rutting test of asphal...

AI Technical Summary

Problems solved by technology

This kind of wheel-rolling forming instrument has the following disadvantages: the movement of the rolling wheel relative to the test piece is non-uniform motion, the load on each part of the test piece is uneven, and the degree of compaction is inconsistent, which makes the density of each part of the formed test piece uneven. , it is impossible to accurately simulate the rolling condition of the road roller during the on-site construction process, so the reliability of the test data is poor

At the same time, the pressure adjustment on the rolling wheel depends on adjusting the position of the load. This adjustment is not easy to achieve precise and arbitrary settings, so the operation is not very convenient and the accuracy is poor.

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