Workability testing device and workability evaluation method for asphalt mixture

Abstract

The invention discloses a workability testing device and a workability evaluation method for an asphalt mixture. The invention relates to the technical field of road engineering. The device comprisesa rack, a torque loader, a stirrer, a rotation speed / rotation angle measurer, an insulation barrel and a controller. The rack is fixedly arranged. The insulation barrel is detachably connected to thebottom of the rack. The torque loader is arranged at the top of the rack. The stirrer penetrates through the upper part of the rack, the upper end of the stirrer is fixedly connected with the output end of the torque loader, and the lower end of the stirrer extends into the insulation barrel. The rotation speed / rotation angle measurer is arranged on the rack, and is used for measuring the rotationspeed and rotation angle changes of the stirrer. The controller is arranged on the rack, and the torque loader and the rotation speed / rotation angle measurer are both electrically connected with thecontroller. The workability of the asphalt mixture is evaluated by measuring the maximum rotation speed and rotation angle values of the fixed torque within a specified time of a stirring shaft and utilizing a formula to calculate the workability index, so that the defect of unreal workability evaluation caused by inaccurate test data in the prior art is overcome.

Description

technical field [0001] The invention relates to the technical field of road engineering, in particular to a workability test device and evaluation method of asphalt mixture. Background technique [0002] With the development of the national economy and the progress of science and technology, my country's highway transportation infrastructure has been continuously increased and improved. As of the end of 2018, the total mileage of national highways reached 4,846,500 kilometers, of which 142,600 kilometers were expressways, ranking first in the world. Asphalt pavement has been widely used in highway construction due to its simple construction process, convenient material acquisition, excellent road performance and good driving comfort, accounting for more than 90%. [0003] Asphalt mixture is a mixture made by mixing sandstone aggregate and asphalt binder at a certain temperature. Workability is usually used to characterize the difficulty of paving and compacting. The workab...

AI Technical Summary

Problems solved by technology

However, there is a problem with this method: uneven stirring rate (electric tester - the initial stirring shaft rotation rate is unstable, manual tester - manual stirring rate is difficult to be uniform), resulting in inaccurate test data, and workability evaluation needs to be studied

[0005] In summary, the existing asphalt mixture and workability testers have the problem of inaccurate test data leading to untrue workability evaluation

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