Improved asphalt mixture rut experimental device and experimental method

Abstract

The invention discloses an improved asphalt mixture rut experimental device and experimental method. The method specifically comprises the following steps of 1, preparation work before test: drawing up a test scheme, debugging a rut tester and preparing a test piece, 2, setting a test environment: setting the design temperature of the asphalt mixture and the actual temperature of a rut test, 3, starting a test: performing heat preservation on the test piece: starting the test: fixing the test piece and the test mold on a test bed of a rut tester together, enabling a test wheel to walk in the center of the test piece, enabling the walking direction of the test wheel to be consistent with the rolling direction of the test piece, and starting the rut tester, and 4, calculating test data. According to the improved asphalt mixture rut experimental method, the generation process of asphalt pavement ruts can be simulated more truly, the adaptability of the rut experiment to the modified asphalt mixture is enhanced, and more reasonable reference is provided for asphalt mixture design and high-temperature performance evaluation.

Description

technical field [0001] The invention belongs to the technical field of road engineering, in particular to an improved asphalt mixture rutting experimental device and an experimental method. Background technique [0002] Rutting is one of the most important diseases of asphalt pavement in my country. The appearance of rutting on asphalt pavement will bring a lot of inconvenience and harm to vehicles. The main manifestations are: 1. Rutting on asphalt pavement will affect the smoothness of the road surface and cause driving bumps , affecting driving comfort; 2. Asphalt pavement rutting will cause or aggravate a series of secondary diseases such as cracks and oil spills, reducing the service life and service level of asphalt pavement; 3. Asphalt pavement rutting will cause vehicles to change during driving It is easy to lose control of the direction in the lane or overtaking, especially in rainy weather, the rut deformation area is easy to accumulate water, which is even more unf...

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Problems solved by technology

However, asphalt mixture is a typical viscoelastic material, and its physical and mechanical properties change with the external environment and load. Therefore, the evaluation of asphalt mixture anti-rutting performance is very complicated.

my country mainly evaluates the anti-rutting performance of the mixture according to the requirements of "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering JTGE20-2011" T0719, but the traditional test method has a series of defects and cannot truly reflect the actual force of the road surface in summer state and working state, such as: 1. The traditional rutting test method only considers the vertical pressure effect of the wheel load, but ignores the horizontal frictional resistance between the tire and the road surface; 2. The traditional rutting test method tests when the dynamic stability is large. The error of the result is large, so the adaptability to the modified asphalt mixture is not good; 3. The evaluation index of the traditional rutting test method is single, only considering the deformation of the mixture flow stage, but ignoring the deformation of the compaction stage

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