Test method and test device for coarse aggregate angularity

Abstract

The invention discloses a test method and a test device for coarse aggregate angularity, belonging to the field of a road engineering aggregate test device. According to the method, the inner frictional resistance between coarse aggregates is converted into torque through blades, so as to represent the coarse aggregate angularity. The test device comprises a container, a torque rod, blades and a torque tester, wherein the torque rod is vertically rotationally arranged in the container; three blades in fixed connection with the torque rod are uniformly distributed from top to bottom; horizontal inclined angles between the blades are 120 degrees; the top end of the torque rod is connected with the torque tester. Compared with the prior art, the method and the device provided by the invention have the advantages that the angularity of large-grain size aggregates is represented by the inner frictional resistance between the large-grain size aggregates and have the characteristics that the application scope is wide and the coarse aggregate angularity can be truly reflected.

Description

technical field [0001] The invention relates to the field of road engineering, in particular to a method and a device for testing the angularity of coarse aggregate. Background technique [0002] The angularity of the aggregate, especially the shape and angularity of the coarse aggregate, plays an important role in the gradation of the asphalt mixture, and then has a more obvious impact on the performance of the asphalt mixture. The research results show that the angularity of coarse aggregate plays an important role in the high temperature stability and low temperature crack resistance of asphalt mixture. [0003] In the prior art, the angularity of coarse aggregate is usually evaluated from three aspects: loose packed density, shaken packed density or flow time. Although the three evaluation methods can reflect the angularity of coarse aggregates to a certain extent, their scope of application is very small: the loose packing density evaluation method is suitable for heav...

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Problems solved by technology

Although the three evaluation methods can reflect the angularity of coarse aggregates to a certain extent, the scope of application is very small: the evaluation method of bulk density is suitable for heavy compaction tests of indoor inorganic bonded and stable materials; the evaluation method of vibration density is suitable for It is suitable for the vibration forming test and cement concrete engineering of indoor inorganic combined stable materials; the flow time evaluation method is especially suitable for cement concrete engineering, that is to say, the evaluation of the angularity of coarse aggregates in the prior art lacks a general test method and test method. device

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