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Method for evaluating freezing resistance of semi-rigid base course material by utilizing dynamic compressive resilient modulus

A compressive rebound modulus, semi-rigid base technology, applied in the direction of applying stable tension/pressure to test material strength, etc., can solve the integrity damage of the pavement structure, cannot evaluate the pavement strength, and cannot effectively evaluate the semi-rigid base material Frost resistance and other issues, to achieve the effect of simple method and low cost

Active Publication Date: 2017-05-31
HEILONGJIANG INST OF TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the frost resistance of semi-rigid base materials cannot be effectively evaluated at present, resulting in the inability to evaluate the strength of the pavement, and causing the overall damage of the pavement structure. Method for frost resistance of rigid base materials

Method used

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  • Method for evaluating freezing resistance of semi-rigid base course material by utilizing dynamic compressive resilient modulus
  • Method for evaluating freezing resistance of semi-rigid base course material by utilizing dynamic compressive resilient modulus
  • Method for evaluating freezing resistance of semi-rigid base course material by utilizing dynamic compressive resilient modulus

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specific Embodiment approach 1

[0045] Specific implementation mode 1: This implementation mode is a method for evaluating the frost resistance of semi-rigid base material by using dynamic compressive resilience modulus, which is specifically completed according to the following steps:

[0046] 1. Determination of the dynamic compressive rebound modulus of the comparison specimen:

[0047] ①. Use the static pressure method or the vibration method to make a cylindrical comparison test piece with a diameter of 150mm and a height of 150mm according to the "Test Regulations for Highway Engineering Inorganic Binder Stable Materials" JTGE51-2009, and then test it at a temperature of 18°C ​​to 22°C and Curing for 90 days at a relative humidity of 95% to obtain a comparison specimen;

[0048] ②. Divide the circumference of the cylindrical section at a distance of 2.5cm from the upper end of the comparison test piece into three equal parts, and then mark the three equal points to obtain three upper marking points; at...

specific Embodiment approach 2

[0084] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the temperature of the low temperature box described in Step 2 ②(2) is -18°C~-18.5°C. Other steps are the same as in the first embodiment.

specific Embodiment approach 3

[0085] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: step 1. adopts static pressure method or vibration method in accordance with "Highway Engineering Inorganic Binder Stable Material Test Regulations" JTG E51-2009, making A cylindrical comparison test piece with a diameter of 150mm and a height of 150mm was cured for 90 days at a temperature of 20°C and a relative humidity of 95% to obtain a comparison test piece. Other steps are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for evaluating the freezing resistance of a semi-rigid base course material by utilizing dynamic compressive resilient modulus and relates to a method for evaluating the freezing resistance of the semi-rigid base course material, aiming at solving the problems that the freezing resistance of the semi-rigid base course material cannot be effectively evaluated at present so that the strength of a road surface cannot be evaluated and integrated damages of a road surface structure are caused. The method comprises the following steps: 1, determining the dynamic compressive resilient modulus of a comparing test piece; 2, determining the dynamic compressive resilient modulus of a test piece to be detected; 3, calculating a dynamic compressive resilient modulus loss ratio FRI of the test piece to be detected which is frozen and thawed for (i+1) times. The freezing resistance of the semi-rigid base course material is evaluated by adopting the dynamic compressive resilient modulus loss ratio and damages of an inner structure of a mixture can be sensitively reflected; damage conditions caused by freezing and thawing effect under an actual condition can be more accurately characterized. The method for evaluating the freezing resistance of the semi-rigid base course material by utilizing the dynamic compressive resilient modulus can be obtained.

Description

technical field [0001] The invention relates to a method for evaluating the frost resistance of a semi-rigid base material. Background technique [0002] Semi-rigid base material is the most widely used road pavement base material in China. It is a hydraulic composite material with outstanding advantages such as high strength, good water stability and low cost. Studies have shown that the frost resistance of pavement base materials is directly related to the occurrence of pavement diseases in cold regions. The performance of the semi-rigid base material is attenuated under repeated freezing and thawing, which will reduce the strength of the pavement and cause the overall damage of the pavement structure, which will shorten the service life of the pavement. Therefore, the antifreeze performance of semi-rigid base material is closely related to the service life of the pavement. [0003] At present, there have been certain research results on the research on the frost resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 王一琪王兴隆谭忆秋董泽蛟王开生
Owner HEILONGJIANG INST OF TECH
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