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Test Method for Ball-Three Plate Friction for Identifying Surfactant-Based Warm Mix Asphalts
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A surfactant and test method technology, applied in the field of organic material testing, can solve the problems of lack of effective means and methods for finished warm mix asphalt, no finished warm mix asphalt, inspection, etc.
Active Publication Date: 2019-06-14
北京市道路工程质量监督站
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Problems solved by technology
[0004] However, the existing material factory purchases the finished warm mix asphalt and directly mixes the warm mix asphalt mixture, lacking effective means and methods for the quality monitoring of the finished warm mix asphalt, and the government supervision department does not have a good means to control the quality of the finished warm mix asphalt Quality inspection of finished warm mix asphalt
Warm mix asphalt producers add less or no warm mix agent to base asphalt, which will greatly affect the performance of warm mix asphalt mixture
Method used
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Embodiment 1
[0036] See figure 1 and figure 2 , a test bench for ball-three-plate friction test, used to identify warm mix asphalt added with surfactant-type warm mix agent, including a bowl-shaped container with triangular protrusions on the bottom surface of the container, and three triangular protrusions The edge is connected with a steel sheet 2, and the steel sheet protrudes from the upper edge 401 of the bowl-shaped container, and is used to fix the test bench on the base 5 of the rheometer workbench.
[0037] The inner diameter of the bowl-shaped container 4 of the test bench of the present embodiment is 29mm, deep 14mm, and the projection of its bottom surface is equilateral triangle shape, and the length direction of the steel sheet that the limit of equilateral triangle is connected with this limit is vertical, and steel Screw holes and bolts are provided at one end of the sheet protruding from the bowl-shaped container.
Embodiment 2
[0039] Take 0.8g of asphalt as a sample, heat it to 140°C, and pour it into the high-temperature-resistant specimen mold (see image 3 ), after the asphalt is cooled, pour out the high-temperature-resistant specimen mold to obtain a cylindrical sample with a cylindrical hollow area. The cylindrical sample has a height of 2 mm, an inner diameter of 18 mm, and an outer diameter of 34 mm.
[0040] Ball-three-plate friction test method for identifying surfactant-based warm mix asphalt, including the steps of:
[0041] S1: The sample asphalt is made into a cylindrical sample with a cylindrical hollow area, and the cylindrical sample is placed on the test bench of embodiment 1, and the steel sheet 2 of the test bench is fixed on the base 5 of the rheometer workbench, at 110 The friction test was carried out at ℃ temperature; the temperature control time was 10min. Under heating conditions, the bitumen sample melts, filling the bowl-shaped container, and the bulbous bottom end of t...
Embodiment 3
[0047] The asphalt samples include base asphalt and warm mix asphalt with 3‰ warm mix agent (according to the mass of base asphalt), and two specimens are prepared for each, a total of four specimens. The base asphalt used in the warm mix asphalt and the base asphalt in the sample are both 70# asphalt.
[0048] The same operation steps as in Example 2, the results show that the difference between base asphalt and warm mix asphalt with 3‰ warm mix agent is only 7%.
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Abstract
The invention provides a ball-three-plate friction test method for identifying a surfactant type warm mix asphalt (WMA). The method comprises the steps of S1, preparing an asphalt sample into a cylindrical sample with a cylindrical hollow region, placing the cylindrical sample onto a test table of a rheometer, and conducting the friction test at the melting temperature of the asphalt; S2, rotating the rotor of the rheometer at a speed of 10<-7> m / s to 1.0 m / s, measuring the friction coefficient of the sample, and establishing a mathematical model of the friction coefficient and the rotating speed; S3, figuring out the difference between a matrix warm mix asphalt and a matrix asphalt. Based on the method, whether a commercially available warm mix asphalt finished product contains a warm mix additive or not can be identified. Meanwhile, the method provides the support for the establishment of a quality monitoring system for warm mix asphalt finished products and asphalt mixtures.
Description
technical field [0001] The invention relates to a method for identifying warm-mixed asphalt and a device used, belonging to the technical field of organic material testing. Background technique [0002] Warm mix asphalt mixture (WMA) is a kind of mixing temperature between hot mix asphalt mixture (160 ~ 180 ℃) and cold mix asphalt mixture (10 ~ 40 ℃), the performance meets the standard requirements of hot mix asphalt mixture new asphalt mixture. Compared with hot-mix asphalt mixture, the mixing temperature of warm-mix asphalt mixture can generally be lowered by 20-40°C, so that the heating temperature of the aggregate can be significantly lowered, and the harmful effects of hot-mix asphalt mixture caused by high-temperature mixing can be well alleviated. Large gas emissions, asphalt aging and high energy consumption, thereby saving energy and protecting the environment. Due to its huge advantages in environmental protection and energy consumption, warm-mix asphalt technolo...
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