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Method for judging bituminous mixture skeleton structure

A technology of asphalt mixture and skeleton structure, which is applied in the direction of analysis materials, preparation of test samples, measuring devices, etc., can solve the problems of not fully considering the resistance of skeleton structure to external loads, etc., and achieve easy operation, simple test steps, The effect of simple test methods

Inactive Publication Date: 2012-09-19
HOHAI UNIV
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Problems solved by technology

However, both the Bailey method and the determination method of the mineral gap ratio are the design methods of the volume angle, which do not fully consider the resistance of the skeleton structure to the external load

Method used

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  • Method for judging bituminous mixture skeleton structure
  • Method for judging bituminous mixture skeleton structure
  • Method for judging bituminous mixture skeleton structure

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Embodiment

[0033] The gradation to be determined is shown in Table 1. According to the gradation in Table 1, 3000g of aggregate mixture is prepared, and the mass of each grade of aggregate is calculated according to Table 1. The results are shown in Table 2.

[0034] Table 1 Aggregate gradation to be determined

[0035] Particle size / mm Passing rate / % 16 100 13.2 94 9.5 63 4.75 26 2.36 20 1.18 18 0.6 15 0.3 13

[0036] Table 2 The quality of aggregates in each grade

[0037] particle size 13.2~16mm 9.5~13.2mm 4.75~9.5mm 2.36~4.75mm 1.18~2.36mm 0.6~1.18mm 0.3~0.6mm <0.3mm

[0038] Put 3000g of coarse and fine aggregate mixture in three layers into a steel test mold with an inner diameter of 152mm and a height of 170mm, and put 1000g of aggregate in each layer. A compressive load of 10 kN is applied to the aggregate in the test mold. Apply a penetration load of 1 mm / min to the aggregate mixture on the penet...

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Abstract

The invention discloses a method for judging whether a bituminous mixture skeleton structure is formed or not. The technical problem that whether coarse aggregates form a skeleton structure or not cannot be judged in a skeleton type bituminous mixture designed process needs to be solved. As the coarse aggregates and fine aggregates have completely different injection features in an injection test, injection tests for measuring a coarse aggregate skeleton structure are proposed. The method comprises following steps: performing the injection test for coarse aggregate mixture and obtaining the relation curve of the injection resistance and the injection depth of the coarse aggregate mixture; and adding the fine aggregates in the coarse aggregate mixture, performing the injection test under the same test conditions, comparing the largest injection resistance with the largest injection resistance of the coarse aggregate mixture; and judging whether the coarse aggregates form the skeleton structure or not. The injection tests are used as evaluation means, and a stress state of bituminous mixture in a road surface structure is met. Compared with the prior art, the method can more scientifically judge whether the coarse aggregates in the bituminous mixture form the skeleton structure or not.

Description

technical field [0001] The invention belongs to the field of gradation design of skeleton-type asphalt mixtures, and in particular relates to a method for measuring skeleton composition of aggregates. Background technique [0002] Skeleton-dense asphalt mixture has been widely used in many countries in the world because of its excellent high-temperature anti-rutting performance, low-temperature crack resistance and fatigue resistance. The typical skeleton-dense asphalt mixture is asphalt horseshoe grease mixture (referred to as SMA). Extensive use experience shows that the excellent performance of skeleton-dense asphalt mixture is not only due to the use of high-quality aggregates, modified asphalt and fibers, but also due to the skeleton structure formed by the coarse aggregate. Therefore, the formation of a stable skeleton structure by coarse aggregate is the key to ensure the excellent performance of the skeleton-dense mixture. [0003] In order to design a skeleton-typ...

Claims

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Application Information

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IPC IPC(8): G01N19/00G01N1/28
Inventor 陈俊
Owner HOHAI UNIV
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