A test method for scouring freeze-thaw splitting of porous asphalt mixture

A freeze-thaw splitting test and asphalt mixture technology, which is used in the application of repetitive force/pulse force to test the strength of materials, etc., to achieve the effect of accurate and reliable test data, guaranteeing performance, and good promotion and utilization value.

Active Publication Date: 2017-02-22
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a porous asphalt mixture scouring freeze-thaw splitting test method for the shortcomings of existing porous asphalt mixture water stability evaluation methods and indicators, and to evaluate the erosion and freeze-thaw performance of porous asphalt mixture through indoor tests , can easily and conveniently judge the water stability of porous asphalt pavement in the actual use process

Method used

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  • A test method for scouring freeze-thaw splitting of porous asphalt mixture
  • A test method for scouring freeze-thaw splitting of porous asphalt mixture
  • A test method for scouring freeze-thaw splitting of porous asphalt mixture

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Effect test

Embodiment 1

[0051] According to the design of asphalt ratio and gradation of porous asphalt mixture, according to the T 0702-2011 compaction method in "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering JTG E20-2011", indoor mixing produces porous asphalt mixture and forms standard Marshall specimens , the adopted design gradation, asphalt ratio and target design void ratio are shown in Table 1.

[0052] Table 1 Mixture design gradation, asphalt ratio and target design void ratio

[0053]

[0054]

[0055] The porosity of the tested specimens was within the range of plus or minus 0.5% of the design target porosity, and the unqualified specimens were discarded, and a total of 32 Marshall specimens meeting the requirements were prepared.

[0056] Divide the test pieces randomly into 8 groups, 4 test pieces in each group, and place them in a constant temperature box at 25°C for 60 minutes, and use a scour tester to wash the surface of each group of test pieces ver...

Embodiment 2

[0061] According to the design of asphalt ratio and gradation of porous asphalt mixture, according to the T 0702-2011 compaction method in "Test Regulations for Asphalt and Asphalt Mixtures in Highway Engineering JTG E20-2011", indoor mixing produces porous asphalt mixture and forms standard Marshall specimens , the adopted design gradation, asphalt ratio and target design void ratio are shown in Table 3.

[0062] Table 3 Mixture design gradation, asphalt ratio and target design void ratio

[0063]

[0064]

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Abstract

The invention discloses a scouring freeze-thaw splitting test method for porous asphalt mixtures. The method comprises the following steps: firstly, performing grading and asphalt-aggregate ratio design on the porous asphalt mixtures, blending the porous asphalt mixtures indoors and forming test pieces; secondly, randomly equally dividing the test pieces into two groups, directly performing a splitting test on the first group of test pieces, scouring the surfaces of the second group of test pieces under the corresponding pressure intensity for the corresponding time according to the actual vehicle speed and pavement design traffic volume, performing a freeze-thaw test, and after the scouring freeze-thaw circulation is finished twice, performing the splitting test; finally, comparing the average splitting strength of the second group of test pieces with that of the first group of test pieces. According to the method, whether the design of the porous asphalt mixtures is reasonable or not can be judged and the water stability of different porous asphalt mixtures can be compared; also, an actual pavement sample can be analyzed, the performance of pavement materials in different service stages can be judged, the basis can be provided for developing pre-maintenance measures of pavement performance, and the long-term service performance of the pavement can be guaranteed.

Description

technical field [0001] The invention relates to the technical field of asphalt mixture tests, in particular to a test method for scouring, freeze-thaw, and splitting of porous asphalt mixtures. Background technique [0002] Porous asphalt pavement is a pavement structure in which a porous asphalt mixture with a large void ratio is laid on the road surface as a drainage layer, and a densely graded asphalt mixture is laid under it and an impermeable layer is laid between layers to ensure that rainwater enters the porous The asphalt mixture layer does not continue to infiltrate, but is quickly discharged to the outside of the pavement structure along the porous asphalt mixture layer. The porous asphalt mixture adopts discontinuous gradation, the porosity of the mixture is between 18% and 25%, and the inter-connected voids are the main ones. The pavement has excellent drainage performance and noise reduction function. Porous asphalt pavement can effectively reduce road surface ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
Inventor 马涛梁彦龙赵晨黄晓明张垚
Owner SOUTHEAST UNIV
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