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A Design Method of Asphalt Pavement Load-bearing Layer Material Based on Structural and Functional Requirements

A technology for asphalt pavement and functional requirements, which is applied in the field of material design of asphalt pavement bearing layers based on structural and functional requirements, and can solve problems such as disconnection between design and structural design.

Active Publication Date: 2020-05-05
HARBIN INST OF TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional asphalt mixture material design is out of touch with the structural design. At the same time, considering that the permanent deformation of the asphalt pavement is the main disease form of the asphalt pavement load-bearing layer at present, a new method based on structural function is proposed. Design method of required asphalt pavement load-bearing course material

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  • A Design Method of Asphalt Pavement Load-bearing Layer Material Based on Structural and Functional Requirements
  • A Design Method of Asphalt Pavement Load-bearing Layer Material Based on Structural and Functional Requirements
  • A Design Method of Asphalt Pavement Load-bearing Layer Material Based on Structural and Functional Requirements

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specific Embodiment approach 1

[0038] Specific implementation mode one: as Figure 14 As shown, what is described in this embodiment is a design method for asphalt pavement load-bearing layer materials based on structural and functional requirements. The specific steps of the method are as follows:

[0039] Step 1: According to the technical specification for highway asphalt pavement construction (JTGF40-2004), design 1 to 3 groups of different mineral material gradations for optimization within the engineering design gradation range, and design the mineral material gradation according to the local Practical experience to estimate the optimal amount of asphalt (if the optimal amount of asphalt cannot be estimated, initially select 5 kinds of asphalt amounts to form Marshall specimens, and measure the porosity of the specimens under different asphalt amounts. For AC and SMA graded asphalt mixture, the estimated amount of asphalt should make the void ratio of the formed asphalt mixture specimens 4% advisable)...

Embodiment 1

[0049] A design method for asphalt pavement load-bearing layer materials based on structural and functional requirements. Firstly, it is explained that the dynamic modulus is sensitive to the change of asphalt content, which can be used as a mechanical parameter to guide the design of asphalt mixture; Based on the relationship between the permanent deformation capacity of the material, the design criteria for the design parameters of the asphalt pavement load-bearing layer mixture are proposed; finally, an example is given to illustrate the method of the load-bearing layer asphalt material according to the structure and function requirements.

[0050] 1. Proposal of dynamic modulus parameters of asphalt mixture in bearing layer

[0051] First, take AC-20 as an example to select three different gradations. The pass rate of mineral material design gradation is shown in Table 2. The gradation curve is as follows: figure 1 As shown, the asphalt is 30# base asphalt, 90# base asphal...

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Abstract

The invention provides an asphalt pavement load bearing layer material design method based on a structural functional requirement, and belongs to the technical field of asphalt material design. Dynamic moduli are adopted as design parameters of load bearing layer permanent deformation resistant performance, through a flow number Fn in a creep test, relation is built between the dynamic moduli of an asphalt mixing material and dynamic stability to evaluate the quality of pavement material permanent deformation resistant performance, and design for guiding a load bearing layer asphalt pavement in combination with size parameters and dynamic modulus parameters of the asphalt mixing material is achieved. The asphalt pavement load bearing layer material design method is characterized in that dynamic modulus tests are selected as a matching ratio design method of the load bearing layer asphalt mixing material; the dynamic moduli are adopted as the design parameters of the load bearing layerasphalt mixing material according to the structural functional requirement; the relation between the dynamic moduli and the dynamic stability at all frequencies under the condition of 25 DEG C is deduced in combination with the flow number Fn measured by the experiments and results of the dynamic modulus tests under the different frequencies, and a design standard of the dynamic modulus design parameters of the load bearing layer asphalt mixing material is built.

Description

technical field [0001] The invention belongs to the technical field of asphalt material design, and in particular relates to a material design method for an asphalt pavement load-bearing layer based on structural function requirements. Background technique [0002] The material design of asphalt pavement in my country has not specifically studied the functional performance (smoothing and comfortable performance, anti-skid performance) and structural performance (water damage resistance, high temperature rutting resistance, low temperature cracking resistance, etc.) of pavement materials in different depth structural layers. Anti-fatigue performance) The effect of these two aspects makes us determine the technical requirements of asphalt mixture raw material technical indicators, mixture gradation type, aggregate maximum nominal particle size, optimal asphalt dosage and target void ratio, etc., The differences in the functional requirements of the pavement structure at differen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/20G06F119/14
CPCG06F30/20G06F2119/06
Inventor 徐慧宁谭忆秋董岐峰周细威傅锡光
Owner HARBIN INST OF TECH
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