Large strain based macromoleclar polymer concrete fatigue life evaluation method

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...

AI Technical Summary

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 days and dried. The bridge deck pavement layer asphalt mixture is rolled and formed into shear composite specimens, cut into specimens of specified size along the rolling direction, and subjected to freeze-thaw cycle tests. One set of specimens is not vacuum-saturated with water, and the other set of specimens Put the specimens into a plastic bag after being vacuum-saturated with water, add about 15mL of water, freeze at -18°C for 16 hours, then immediately put them in a constant temperature water tank at 60°C, and keep them warm for 24 hours. Both groups of test pieces are immersed in a constant temperature water tank at 60°C Less than 2h; carry out the shear test, calculate the freeze-thaw cycle shear strength ratio RSR, RSR is required to be ≥ 85%, but this patent does not involve the fatigue life evaluation of polymer concrete based on large strain

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