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Freeze-thaw stability testing method for bearing capacity of aggregate base

A freeze-thaw stability and test method technology, which is applied in the field of freeze-thaw stability test of the bearing capacity of the granular base layer, can solve the problems such as the difficulty of unifying the relevant relations and the inability to meet the requirements of road surface design, and achieves wide application and reliable measurement results. Effect

Inactive Publication Date: 2009-11-11
CHONGQING JIAOTONG UNIVERSITY
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Problems solved by technology

Obviously, with the vigorous development of high-grade highways in my country, which are mainly highways, and the diversification of roadbed filling materials, the look-up table method can no longer meet the requirements of today's road surface design.
[0009] The conversion method is a modification of the look-up table method, but due to the influence of different terrain, geology, hydrology, climate and other conditions, it is difficult to unify the correlation formula required by this method

Method used

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  • Freeze-thaw stability testing method for bearing capacity of aggregate base
  • Freeze-thaw stability testing method for bearing capacity of aggregate base
  • Freeze-thaw stability testing method for bearing capacity of aggregate base

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Embodiment

[0084] Nine specimens were prepared for each gradation of the granular material, and they were divided into three groups on average according to the number. One group directly tested the change value of the elastic modulus of the specimens under various loads without freeze-thaw cycles; the rest The two groups underwent 5 and 10 freeze-thaw cycles respectively.

[0085] Freeze-thaw cycle conditions: 1) soak the specimen in water for 24 hours, 2) freeze it at -20°C for 16 hours, 3) and then soak it in water for 8 hours; during the last freeze-thaw cycle, step 1) And 3) the soaking time in water is the same as 24 hours, so that the soaking time before and after freezing and thawing is equal.

[0086] The error of the data obtained from the experiment according to the above-mentioned various parameters and the measured parameters is already within the allowable range. In order to meet some higher standard road surface design requirements, the number of test pieces (the number of ...

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Abstract

The invention discloses a freeze-thaw stability testing method for bearing capacity of an aggregate base layer, which detects the variation value of the modulus of resilience of test pieces with the same specifications under various grades of load respectively under the situations of non freezing and a plurality of times of freezing circulation. The freeze-thaw stability testing method for bearing capacity of aggregate base layer has the beneficial technical effect of disclosing a method capable of effectively detecting the variation value of the modulus of resilience of the aggregate base layer, which provides reliable basis for estimating the subsequent freeze-thaw stability of the aggregate base. The method is simple and easy to operate, has reliable measuring result, and has broad applicable range.

Description

technical field [0001] The invention relates to a freeze-thaw stability evaluation technology for the bearing capacity of a granular material base, in particular to a test method for the freeze-thaw stability of the bearing capacity of a granular base. Background technique [0002] The granular mixture refers to the non-sticky mixture composed of different particle sizes such as sand gravel, sand pebbles, crushed stones, gravel, and stone powder. It not only has good temperature stability and humidity stability, but also forms a The non-linear structural layer has a large bearing capacity and strong resistance to fatigue damage, and can also effectively absorb the stress at the tip of the crack, preventing the early cracking and reflection cracking of the semi-rigid asphalt pavement. Therefore, the use of high-quality graded aggregate mixture as the base layer of asphalt pavement has attracted the attention of the engineering community. [0003] Highway pavement structures ...

Claims

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Application Information

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IPC IPC(8): G01N3/44G01N1/28
Inventor 梁乃兴曹源文梅迎军赵毅李志勇秦旻
Owner CHONGQING JIAOTONG UNIVERSITY
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