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Method for determining reasonable compacting temperature of modified asphalt mixture

A technology for asphalt mixture and modified asphalt, which is applied in the field of determining the reasonable compaction temperature of modified asphalt mixture and determining the compaction temperature, which can solve the problem that the shear rate asphalt is sensitive to changes in viscosity, and the assumed density/porosity standard is difficult to determine. , unsuitable construction state and other problems, to achieve the effect of rapid operation, shortened test period, and simple control of test conditions

Inactive Publication Date: 2013-03-13
王黎明
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the temperature-bulk density / void ratio relationship after variable temperature molding is directly determined, there are three technical defects: ① The target compactness / void ratio of different mixtures using different molding methods is different, and it is difficult to assume that the compactness / void ratio standard determined; ②The shear rate is sensitive to the viscosity change of some asphalt. When the shear rate of the asphalt film in the forming test is different from the actual construction, the directly determined compaction temperature may not be suitable for the construction state; ③When using intermittent Final compactness results are not sensitive to temperature changes when grading (such as OGFC and SMA), excessive forming work or high forming temperature

Method used

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  • Method for determining reasonable compacting temperature of modified asphalt mixture
  • Method for determining reasonable compacting temperature of modified asphalt mixture
  • Method for determining reasonable compacting temperature of modified asphalt mixture

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1. Using a No. 90 base petroleum asphalt, according to the T0625-2011 method in the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E-20-2011), the high-temperature viscosities at 135°C and 175°C are respectively 0.301Pa .s and 0.109Pa.s, and draw the viscosity-temperature curve; according to the provisions of Table 5.2.2-1 in "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004), the viscosity-temperature curve is drawn from 0.28±0.3Pa.s The reasonable compaction temperature range found on the Internet is 134~138°C;

[0032] 2. Determine the gradation of a continuous dense AC-13 asphalt mixture within the gradation range in Table 5.3.2-2 of "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004), as shown in Table 1, and select the amount of asphalt based on experience was 5.2%.

[0033] Table 1 AC-13 Grading Range

[0034]

[0035] 3. Aggregate is prepared by step-by-s...

Embodiment 2

[0048] 1. Using a No. 70 base petroleum asphalt, according to the T0625-2011 method in the "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E-20-2011), the high-temperature viscosities at 135°C and 175°C are respectively 0.367Pa .s and 0.0775Pa.s and draw the viscosity-temperature curve; according to the provisions of Table 5.2.2-1 in "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004), from 0.28±0.3Pa.s on the viscosity-temperature curve It is found that the reasonable compaction temperature range is 140~144°C;

[0049] 2. Determine the gradation of a continuous dense AC-16 asphalt mixture within the gradation range in Table 5.3.2-2 of "Technical Specifications for Construction of Highway Asphalt Pavement" (JTG F40-2004), as shown in Table 4, and select the amount of asphalt based on experience 5.0%.

[0050] Table 4 AC-16 grading range

[0051]

[0052] 3. The rest of the test steps are exactly the same a...

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Abstract

The invention discloses a method for determining reasonable compacting temperature of a modified asphalt mixture, and belongs to the field of road engineering. The method comprises the following steps: using an impacting penetration test to simulate a compacting shear rate and carrying out a temperature changing equivalent shear strength test on the mixture with the degree of density in an initial compacting stage; and calculating the reasonable compacting temperature of the modified asphalt mixture from a reasonable compacting temperature range of a known matrix asphalt mixture according to an equal penetration depth-temperature relation. The method provided by the invention is quick to operate and simple to control the test conditions, the test period is greatly shortened, and the method has application and popularization values.

Description

technical field [0001] The invention relates to a method for determining a compaction temperature, in particular to a method for determining a reasonable compaction temperature of a modified asphalt mixture, and belongs to the field of road engineering. Background technique [0002] The reasonable compaction temperature of modified asphalt mixture is difficult to be directly determined by asphalt. However, when the temperature-bulk density / void ratio relationship after variable temperature molding is directly determined, there are three technical defects: ① The target compactness / void ratio of different mixtures using different molding methods is different, and it is difficult to assume that the compactness / void ratio standard determined; ②The shear rate is sensitive to the viscosity change of some asphalt. When the shear rate of the asphalt film in the forming test is different from the actual construction, the directly determined compaction temperature may not be suitable ...

Claims

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Application Information

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IPC IPC(8): G01K13/10G01N3/24
Inventor 王黎明石振武刘双何松松郭佳龙王立军
Owner 王黎明
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