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Detection method for stability of LSM low-temperature modified asphalt mixture

A technology of modified asphalt and mixture, which is applied in the direction of testing material strength by applying stable tension/compression, and testing material strength by applying repetitive force/pulsation force, which can solve the problem of reduced strength and stability and softening of Marshall specimens , high softening degree of asphalt and other problems, to achieve small internal friction angle, increase compactness and good effect

Active Publication Date: 2017-07-21
HEILONGJIANG PROV INST OF COMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to solve the current "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), too high curing temperature will cause the Marshall specimen to soften, and the softening degree of the asphalt is high, and the strength and stability will be reduced accordingly. The amount increases, and the Marshall stability method specified in the current regulations is not applicable to the problem of LSM modified asphalt. The invention provides a method for detecting the stability of LSM low temperature modified asphalt mixture. The technical scheme adopted is as follows:

Method used

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  • Detection method for stability of LSM low-temperature modified asphalt mixture
  • Detection method for stability of LSM low-temperature modified asphalt mixture
  • Detection method for stability of LSM low-temperature modified asphalt mixture

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Effect test

Embodiment 1

[0035] 1. This method is applicable to the Marshall stability test and immersion Marshall stability test of LSM low-temperature modified asphalt mixture, so as to carry out the mix ratio design of asphalt mixture or the quality inspection of asphalt pavement construction. Water immersion Marshall stability test (vacuum saturated Marshall test can also be carried out) is used to test the ability of the asphalt mixture to resist spalling when it is damaged by water, and to test the feasibility of the mix ratio design by measuring its water stability.

[0036] 2. This method is suitable for forming standard Marshall cylinders and large Marshall specimens according to the current "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011).

[0037] 3. Stirring temperature of Marshall specimen

[0038] The LSM low-temperature modified asphalt mixture was mixed, and the mixing parameters were shown in Table 1, and a sufficient number of Marshall specime...

Embodiment 2

[0059] 1. This method is applicable to the Marshall stability test and immersion Marshall stability test of LSM low-temperature modified asphalt mixture, so as to carry out the mix ratio design of asphalt mixture or the quality inspection of asphalt pavement construction. Water immersion Marshall stability test (vacuum saturated Marshall test can also be carried out) is used to test the ability of the asphalt mixture to resist spalling when it is damaged by water, and to test the feasibility of the mix ratio design by measuring its water stability.

[0060] 2. This method is suitable for forming standard Marshall cylinders and large Marshall specimens according to the current "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011).

[0061] 3. The requirements for instruments and equipment meet the same requirements as in the current "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011) (T0709-2011).

[0062...

Embodiment 3

[0098] The stability of LSM low temperature modified mixture was measured according to the method of the present invention and the method stipulated in the current "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTGE20-2011), and the results are shown in Table 5. The inventive method: according to the optimal method that embodiment 1 and 2 draws, specifically as follows:

[0099] Step 1: mixing LSM low-temperature modified asphalt mixture, forming Marshall test pieces;

[0100] Step 2: After the Marshall test piece is formed, it is placed in the mold for 3 days, and it is demoulded after reaching the age;

[0101] Step 3: Keep the demoulded Marshall specimen in a constant temperature water tank at room temperature (15°C-25°C);

[0102] Step 4: According to the method stipulated in the current "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering" (JTG E20-2011), the physical indicators, stability and flow value mechanical perfor...

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Abstract

The invention discloses a detection method for the stability of an LSM low-temperature modified asphalt mixture, and belongs to the technical field of rod engineering test. The method comprises the following steps: stirring the LSM low-temperature modified asphalt mixture to form a Marshall test piece; maintaining the mold after the Marshall test piece is formed to be placed for three to four days, and carrying out demolding after an age period; carrying out heat preservation on the demolded Marshall test piece in a thermostatic water bath of 35 to 40 DEG C; and detecting the physical index and stability of the Marshall test piece after maintenance and the flow value mechanical performance index according to a method specified in existing road engineering asphalt and asphalt mixture testing regulations (JTG E20-2011). The method is applicable for Marshall stability test and immersion Marshall stability test of the LSM low-temperature modified asphalt mixture so as to mix proportion design of the asphalt mixture or asphalt pavement construction quality inspection.

Description

technical field [0001] The invention relates to a method for detecting the stability of LSM low-temperature modified asphalt mixture, which belongs to the technical field of road engineering testing. Background technique [0002] LSM low-temperature modified asphalt contains rubber modifier components. The advantage of its modification mechanism is that it can improve the viscosity of asphalt and reduce the softening point. Through the study, the softening point of LSM low temperature modified asphalt is above 27°C, which is close to normal temperature. The softening point of polymer SBS modified asphalt is above 70°C, and the softening point of base asphalt is above 40°C, which are generally higher than those of LSM low temperature modified asphalt. The current "Test Regulations for Highway Asphalt and Asphalt Mixtures" JTG E20-2011 requires that the test temperature of the Marshall specimen in the constant temperature water tank after demoulding is 60°C, which is close to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/18G01N3/34
CPCG01N3/18G01N3/34
Inventor 于立泽张宝珠刘丹丹任少辉温忠海左贵林徐岩赵思博高波
Owner HEILONGJIANG PROV INST OF COMM
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