Large strain based macromoleclar polymer concrete fatigue life evaluation method

A high-molecular polymer and fatigue life technology, which is applied in the direction of analyzing materials, measuring devices, instruments, etc., can solve the fatigue life of asphalt materials, which cannot meet the requirements of high-molecular polymer concrete, and does not involve the fatigue life of high-molecular polymer concrete. evaluation, etc.

Inactive Publication Date: 2018-11-09
BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current method for evaluating fatigue is designed for ordinary asphalt mixtures, and generally controls the magnitude of stress or strain. However, since the properties and strength of asphalt mixtures are different from those of polymer concrete, the fatigue life of asphalt materials cannot be evaluated. The method may not be able to meet the requirements of high molecular polymer concrete, so the research on the fatigue performance of high molecular polymer concrete is particularly important
[0005] The invention patent with the patent application number 201410027525.4 discloses a method for evaluating the shear resistance of asphalt sand and modified asphalt sand bridge deck pavement waterproof adhesive layer. Under the conditions, take out the cement concrete specimen with the design label size of 300mm×300mm×50mm that has been cured for 28 da

Method used

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  • Large strain based macromoleclar polymer concrete fatigue life evaluation method
  • Large strain based macromoleclar polymer concrete fatigue life evaluation method
  • Large strain based macromoleclar polymer concrete fatigue life evaluation method

Examples

Experimental program
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Embodiment 1

[0052] A method for evaluating the fatigue life of polymer concrete based on large strains, comprising the following steps:

[0053] Step 1: Design the mix ratio of the polymer mixture;

[0054] Step 2: Determine aggregate crushed stone, polymer binder glue-stone ratio;

[0055] Step 3: Take aggregate gravel and polymer binder and mix according to the mixing ratio, form a test piece, and conduct a split test to determine its curing age;

[0056] Step 4: According to the determined gradation and rubber-stone ratio, use the wheel to form the rutting test plate;

[0057] Step 5: After the curing time is reached, cut it into a beam-type test piece;

[0058] Step 6: Perform a four-point loading trabecular fatigue test on the formed specimen.

[0059] The thickness of the bridge deck pavement used in this experiment is 2-5cm. According to the "Technical Specifications for Highway Asphalt Pavement Construction" (JTGF40-2004) about the relationship between the thickness of the asph...

Embodiment 2

[0077] Different from Example 1, the polymer in the present invention is mainly synthesized from polyol and isocyanate. The -NCO group in the polymer resin cementing material forms a better network hinge structure after curing, which can form better hardness and strength. Its main components are polyol and isocyanate. The ratio of polyol to isocyanate during synthesis is 1:3. The mixing reaction time during synthesis is 10-15 minutes. The humidity in the air needs to be controlled during synthesis. The humidity is not more than 40%, and the relative humidity is not more than 70%. The specific synthetic route of high molecular polymer is as follows: image 3 shown.

Embodiment 3

[0079] The difference from Example 2 is that the ratio of the amount added during synthesis is polyol:isocyanate is 1:2.

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Abstract

The invention relates to a large strain based macromoleclar polymer concrete fatigue life evaluation method. The method includes the steps of: 1. conducting mix proportion design on a macromoleclar polymer mixture; 2. determining the adhesive-stone ratio of aggregate gravel and a polymer binder; 3. blending the aggregate gravel and the polymer binder according to the mixing proportion to form a test piece, and performing splitting test to determine the curing period; 4. according to the well determined grading and adhesive-stone ratio, molding a rut test plate by wheel rolling; 5. when reaching the curing time, performing cutting into a beam test piece; and 6. conducting four-point loaded trabecular fatigue test on the molded test piece. By controlling large strain, the invention puts forward the evaluation method suitable for macromoleclar polymer concrete. Different from the fatigue life of ordinary asphalt mixtures, the fatigue life of macromoleclar polymer concrete can reach the million level, therefore ordinary methods directed at the fatigue life of asphalt mixtures are not applicable.

Description

technical field [0001] The invention belongs to the technical field of road material engineering and relates to a method for evaluating the fatigue life of high molecular polymer concrete based on large strain. Background technique [0002] During the service period, the asphalt pavement is subjected to repeated wheel loads under the influence of temperature and environment, and is in a state of overlapping stress and strain for a long time, resulting in a gradual decline in the structural strength of the pavement. When the load is repeated for more than a certain number of times, the stress generated in the pavement under the load will exceed the structural resistance after the strength drops, causing cracks to appear on the pavement, and eventually fatigue fracture damage will occur. [0003] Due to the large deformation of the longitudinal ribs and girder webs of steel bridge decks under loading conditions, cracks are often caused, so the materials used for steel bridge d...

Claims

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Application Information

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IPC IPC(8): G01N33/38
CPCG01N33/383
Inventor 徐世法李林涛李铁成胡超峰杨东丽陈涛吴禹朱大治吴文荣任占伟王丹石家继
Owner BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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