Partition test method for ultraviolet light aging intensity of asphalt
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A test method, ultraviolet technology, applied in measuring devices, analysis materials, weather resistance/light resistance/corrosion resistance, etc., can solve the problems of asphalt uneven ultraviolet light, etc., and achieve the effect of simple test operation and reasonable design
Inactive Publication Date: 2013-07-10
TONGJI UNIV
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In the past light aging test, the samples were prepared by using the aging disc or sample pan in the T0609-2011 asphalt film heating test and T0610-2011 asphalt rotating film heating test in this regulation, but there is a big problem: The aging disk in the regulations is disc-shaped, with an inner diameter of 140mm and a depth of 9.5mm~10mm. Due to the uniform temperature in the (rotating) film oven, the temperature of each point of the asphalt sample in the aging disk can be guaranteed to be consistent.
The ultraviolet light intensity radiated by the ultraviolet light source has a spatial distribution. On the vertical line of the center of the lamp axis, the ultraviolet intensity attenuates with the increase of the horizontal radiation distance, so the asphalt in the conventional aging disk will be under the uneven ultraviolet light.
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Embodiment 1
[0046] 1. Determination of the type of ultraviolet light source
[0047] The test uses AIUREB (artificial strong ultraviolet light source environment box) as the ultraviolet light source (such as Figure 5 ), using a total of 6 reflective black light high-pressure mercury lamps, each with a power of 125W, and the shape under the radiation is circular.
[0048] 2. Determination of the spatial distribution of ultraviolet radiation intensity
[0049] In the embodiment, an ultraviolet radiation meter is selected to test the intensity of ultraviolet light, and the diameter of the bottom end of the test probe is 29 mm. Prepare a piece of A3 hard paper and determine the center A of the circle 0 , use a compass to draw concentric circles with radii of 2cm, 4cm, and 6cm, and draw two diameters. The intersection point of two diameters and three concentric circles is used as the measuring point A of ultraviolet light intensity 1 , B 1 、C 1 、D 1 , A 2 , B 2 、C 2 、D 2 , A 3 , ...
Embodiment 2
[0075] 1. Determination of the type of ultraviolet light source
[0076] The test uses a strong ultraviolet high-pressure mercury lamp as the ultraviolet light source (such as Figure 8 ), the power is 1kW, and the shape under the radiation is square.
[0077] The spectral composition of the strong ultraviolet high-pressure mercury lamp is analyzed by using a fiber grating spectroscopic intensity measuring instrument. In order to better simulate ultraviolet rays, a corresponding filter is installed under the mercury lamp according to the spectral measurement results (such as Figure 9 ).
[0078] Considering that the intensity of ultraviolet rays irradiated is inversely proportional to the distance from the light source, the valve for placing the burn-in plate in the ultraviolet light source device is designed to be adjustable in height, and the adjustment range is 50cm.
[0079] 2. Determination of the spatial distribution of ultraviolet radiation intensity
[0080] In the...
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Abstract
The invention relates to a partition test method for the ultraviolet light aging intensity of asphalt, which comprises the following concrete steps of: determining to select two different types of ultraviolet (UV) light sources; according to the different ultraviolet light sources, determining the intensity of ultraviolet light by using a UV irradiation meter or UV energy meter, and respectively carrying out space distribution determination of UV light irradiation intensity; according to test required outdoor ultraviolet light irradiation requirements, converting the total effective time of outdoor ultraviolet light irradiation into the total effective time of indoor ultraviolet light irradiation; according to different ultraviolet light source types and the space distribution situation of determined ultraviolet light irradiation intensity, carrying out partition design on an asphalt aging disk; considering asphalt thermal-ageing test requirements in current test specifications and the design of the partition aging disk, putting forward an asphalt sample dosage preparation method for light aging tests; and after carrying out light aging indoor simulation test according to the steps, carrying out macro and micro performance tests on asphalt, and carrying out comprehensive analysis on the uvioresistant light aging performance of ultraviolet through integrating the test factors such as experimental temperature, ultraviolet light irradiation intensity, ultraviolet light irradiation time, and the like. The test method is reasonable in design, specific and detailed, simple and convenient in test operations.
Description
technical field [0001] The invention belongs to the field of highways and urban roads, and in particular relates to a partition test method for asphalt ultraviolet light aging intensity. Background technique [0002] During the storage, processing and construction of asphalt, a series of physical and chemical changes will occur, such as evaporation, dehydrogenation, condensation, oxidation, etc., which will make the asphalt gradually harden and become brittle, and cannot continue to exert its original bonding or Sealing effect, causing short-term aging. During the follow-up service period, the pavement is strongly radiated by sunlight during the day, and the ultraviolet rays further age the asphalt surface layer, making the asphalt dry, brittle and hard, increasing the low-temperature stiffness, reducing the failure strain, and easily forming temperature shrinkage cracks; at the same time, its viscosity further decreases , the adhesion with the aggregate becomes poor, which...
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