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Scouring freeze-thaw splitting test method for porous asphalt mixtures

A technology of freeze-thaw splitting test and asphalt mixture, applied in the direction of applying repeated force/pulsation force to test the strength of materials, etc., to achieve good promotion and utilization value, easy to implement, and accurate and reliable test data

Active Publication Date: 2015-03-11
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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  • Scouring freeze-thaw splitting test method for porous asphalt mixtures
  • Scouring freeze-thaw splitting test method for porous asphalt mixtures
  • Scouring freeze-thaw splitting test method for porous asphalt mixtures

Examples

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Effect test

Embodiment 1

[0051] According to the design of bitumen ratio and gradation of porous asphalt mixture, according to T 0702-2011 compaction method in "Test Regulations of Highway Engineering Asphalt and Asphalt Mixture JTG E20-2011", indoor mixing production of porous asphalt mixture and forming standard Marshall specimens , The adopted design gradation, oil-stone ratio and target design porosity are shown in Table 1.

[0052] Table 1 Mixture design gradation, oil-stone ratio and target design porosity

[0053]

[0054]

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

[0056] The test pieces were randomly divided into 8 groups, each group had 4 test pieces, and they were placed in a thermostat at 25°C for 60 minutes. The surface of each group of test pieces was washed vertically at a pressure of 0.6Mpa usin...

Embodiment 2

[0061] According to the design of bitumen ratio and gradation of porous asphalt mixture, according to T 0702-2011 compaction method in "Test Regulations of Highway Engineering Asphalt and Asphalt Mixture JTG E20-2011", indoor mixing production of porous asphalt mixture and forming standard Marshall specimens , The adopted design gradation, oil-stone ratio and target design porosity are shown in Table 3.

[0062] Table 3 Mixture design gradation, oil-stone ratio and target design porosity

[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 testing, in particular to a porous asphalt mixture scouring freeze-thaw splitting test method. Background technique [0002] Porous asphalt pavement is a pavement structure in which porous asphalt mixture with larger porosity is laid on the road surface as a drainage layer, while dense-graded asphalt mixture is laid under it and an impervious layer is laid between the 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 intermittent gradation, and the void ratio of the mixture is between 18%-25%, and mainly connected voids. The pavement has excellent drainage performance and noise reduction function. Porous asphalt pavement can effectively reduce the accumulation of water on the road surface, especia...

Claims

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Application Information

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Patent Type & Authority Applications(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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