Freeze-thaw oblique shear test method and system for testing water stability of asphalt mixture
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A technology for asphalt mixture and water stability, which is applied in the direction of using stable shear force to test material strength, measuring device, analyzing material, etc. higher question
Pending Publication Date: 2022-04-01
TONGJI UNIV
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[0013] For this reason, the embodiment of the present invention provides a freeze-thaw oblique shear test method and system for testing the water stability of asphalt mixture, so as to solve the problem that the existing method for testing the water stability of asphalt mixture does not take into account the large lateral force , The road surface load form is relatively complex, the load action form of the road section, the asphalt pavement of the road section whose freeze-thaw splitting strength ratio meets the requirements will appear water damage earlier, and there are problems such as insufficient sensitivity, complicated experimental process, and high requirements for test equipment.
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Embodiment 1
[0051] Such as figure 1 and figure 2 As shown, the present embodiment proposes a freeze-thaw oblique shear test method for testing the water stability of asphalt mixture, which method includes:
[0052] S100, molding the asphalt mixture to obtain a rutting slab test piece with preset specifications and meeting the design void ratio requirement.
[0053] The rutting slab with a height of 10 cm was molded by a rutting compactor, and the porosity of the rutting slab specimen was consistent with that of the corresponding asphalt mixture Marshall compacted 50 times.
[0054] S200. Cutting the rutting plate test piece to obtain a plurality of cube test pieces of the same size, and cutting a prefabricated seam on two opposite planes of each cube test piece.
[0055] Then cut the rut plate specimen to form multiple cube specimens of 10cm*10cm*10cm, and cut a 0.5cm wide and 0.5cm deep prefabricated seam on two opposite planes of each cube specimen, before and after the prefabricated...
Embodiment 2
[0071] Corresponding to the above-mentioned embodiment 1, this embodiment proposes a freeze-thaw oblique shear test system for testing the water stability of asphalt mixture, which includes:
[0072] The specimen forming module is used to form the asphalt mixture to obtain the rutting plate specimen with preset specifications and meeting the design void ratio requirements;
[0073] The prefabricated seam module is used to cut the rutting plate specimen to obtain multiple cube specimens of the same size, and cut a prefabricated seam on two opposite planes of each cube specimen;
[0074] The freeze-thaw treatment module is used to divide the obtained multiple cube specimens into two groups, one group is a freeze-thaw group, and the other group is a non-freeze-thaw group, and the freeze-thaw group is subjected to freeze-thaw treatment;
[0075] The oblique shear test module is used to perform oblique shear tests on the freeze-thaw group and the non-freeze-thaw group respectively....
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Abstract
The embodiment of the invention discloses a freeze-thaw oblique shear test method and system for testing the water stability of an asphalt mixture. The method comprises the following steps: freezing a notched asphalt mixture test piece in an environment of-18 DEG C for 16 hours, and performing water bath in a water tank of 60 DEG C for 24 hours to simulate the freezing and thawing process of the asphalt mixture. And respectively carrying out oblique shear tests on the test pieces which are subjected to freezing and thawing processes and not subjected to freezing and thawing processes, and calculating indexes such as oblique shear strength and oblique shear strength ratio before and after freezing and thawing so as to evaluate the water stability of the asphalt mixture. In the oblique shear strength test, the horizontal force of the asphalt pavement is considered in a force application mode, so that the method is more suitable for testing the water stability of the asphalt mixture at urban intersections and long and large longitudinal slope road sections. According to the test method, a proper oblique shearing angle can be selected according to the actual stress condition of the road surface, and the water stability test adapted to the actual stress condition is carried out on the asphalt mixture of different road sections.
Description
technical field [0001] The embodiments of the present invention relate to the technical field of performance testing of asphalt mixtures, in particular to a freeze-thaw oblique shear test method and system for testing the water stability of asphalt mixtures. Background technique [0002] At present, the water stability test methods for shaped asphalt mixture mainly include immersion Marshall test, immersion splitting test, rutting test and ESC test. [0003] 1. Water immersion Marshall test [0004] The water immersion Marshall test is improved from the Marshall stability test, and its ratio is calculated as the residual stability index by testing the stability before and after water immersion. However, practice has proved that the determination of water stability index by this method is not sensitive to the types of asphalt and aggregates, and there are few cases where the standard 75% is not met, and even the residual stability is greater than 100%. Moreover, the physica...
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