A method for the adhesion test and quantitative evaluation of cold patched asphalt

Abstract

The invention belongs to the technical field of road engineering and particularly discloses a cold-patch asphalt adhesion test and quantitative evaluation method. The method comprises the following steps: dividing cold-patch materials into two groups, preserving and storing one group at the room temperature for 40 hours, carrying out water saturation on the other group under a vacuum condition (98.3KPa-98.7KPa), putting the second group into a constant temperature refrigerator, and freezing at (-18)+ / -2 DEG C for 16h+ / -1h, and carrying out water bath in a constant temperature water tank at 60+ / -5 DEG C for 24 hours; (S5) respectively pouring the first group and the second group into a beaker containing boiling water, continuously heating for 3 minutes, and stirring with a glass bar in theheating process; respectively calculating package rates P of the two groups according to a formula (shown in the description), wherein a represents the number of the asphalt-separated cold-patch materials; calculating a specific value Q of the package rate of the cold-patch materials according to a formula (shown in the description); and formulating a grading standard of the adhesivity of cold-patch asphalt, and determining that the cold-patch asphalt is excellent when Q is more than or equal to 95%, the cold-patch asphalt is good when Q is more than or equal to 90% and less than 95%, the cold-patch asphalt is common when Q is more than or equal to 85% and less than 90%, the cold-patch asphalt is qualified when Q is more than or equal to 80% and less than 85% and the cold-patch asphalt isunqualified when Q is less than 80%. According to the scheme, the method for evaluating the adhesivity of the cold-patch asphalt is provided.

Description

technical field [0001] The invention belongs to the technical field of road engineering, and specifically discloses a cold-patch asphalt adhesion test and a quantitative evaluation method. Background technique [0002] my country has a vast area, and different regions have different climates. For example, the southern regions have more rainfall and the climate is relatively warm, while the northern regions are cold in winter and the bottom is frozen. Perennial low temperature, permafrost does not melt; the asphalt used in regions with different climates is quite different. For areas such as perennial rain, cold-patch asphalt mixture is often used, so the adhesion between cold-patch asphalt and aggregates and water damage resistance Performance will directly relate to the long-term durability of the cold patch. [0003] The current adhesion test between asphalt and aggregates often refers to the adhesion test between asphalt and coarse aggregate (boiling method) in T0616-1993 ...

AI Technical Summary

Problems solved by technology

In the water boiling test, it is difficult to accurately calculate the shedding area of ​​each coarse aggregate, and the judgment is highly subjective. Therefore, the adhesion can only be evaluated qualitatively, not quantitatively.

[0004] In addition, the current water boiling method is more suitable for the evaluation of the adhesion between conventional hot asphalt and aggregates, but for cold patch material, which is often used in water-rich or saturated conditions, the test conditions are obviously not severe enough. , so it is difficult to distinguish the actual effect of different cold filling materials applied under water-rich or water-saturated conditions, which needs further improvement

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