Method for molding asphalt mixture specimen for test by using rotary compaction method

Abstract

The invention discloses a method for molding an asphalt mixture specimen for test by using a rotary compaction method. The method comprises the following steps of: (1) preparing the specimen by the rotary compaction method; and (2) molding the specimen, namely preparing a specimen for a wheel tracking test, a specimen for the Marshall test, and / or a specimen for a bending test from the specimen. The method for molding the asphalt mixture specimen for test by using the rotary compaction method provided by the invention has the advantages that: 1, various concrete specimens are formed by the specimens for molding a gyratory compactor in manners of core drilling, cutting and combining; the molding principle of the specimen is similar to the compaction principle of an actual road press; and the actual performance of the pavement can be well reflected; 2, the molding modes of various concrete specimens are the same; and the difference among various concrete specimens caused by different molding modes is reduced; and 3, required preparation equipment is simple, can be achieved under most of test conditions, and is convenient to popularize.

Description

technical field [0001] The invention relates to a method for forming an asphalt mixture test piece for testing by adopting a rotary compaction method, and is especially suitable for test pieces for wheel track tests, test pieces for Marshall tests and test pieces for bending tests, and belongs to the highway pavement test technology. Background technique [0002] It is an important link to control the engineering design and construction inspection of asphalt pavement to evaluate the performance of asphalt mixture by using indoor molded specimens and field drilled core samples to conduct related tests. At this stage, the forming methods of asphalt mixture specimens for testing in my country include the following three types: [0003] 1) Marshall compaction method: mix the mixture with asphalt, and use a Marshall compactor to perform 75 compactions on both sides. The standard size of the test piece is φ01.6mm×63.5mm; [0004] 2) Wheel rolling method: Determine the bulk densit...

AI Technical Summary

Problems solved by technology

[0007] To sum up, the existing specification system does not uniformly consider the coordination of the performance of the mixture obtained by different molding methods when formulating the relevant test standards, which will make it difficult for the relevant quality control and acceptance standards to reflect the actual performance of the pavement systematically and comprehensively: reflect the high temperature index The results and the low temperature index results essentially represent two materials with different structures, and compared with the rotary compaction method, the test pieces formed by the Marshall compaction method and the wheel rolling method are compared with the asphalt concrete formed by the actual rolling process. big difference

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