	US 12,235,285 B2
	Method and system for quantifying degree of blending of virgin and aged asphalt in hot recycled asphalt mixtures (HRAM)
Liping Liu, Shanghai (CN); Mingchen Li, Shanghai (CN); Lijun Sun, Shanghai (CN); and Lingxiao Liu, Shanghai (CN)
Assigned to TONGJI UNIVERSITY, Shanghai (CN)
Filed by Tongji University, Shanghai (CN)
Filed on May 28, 2022, as Appl. No. 17/827,703.
Claims priority of application No. 202210013797.3 (CN), filed on Jan. 6, 2022.
Prior Publication US 2023/0213550 A1, Jul. 6, 2023
Int. Cl. G01Q 60/38 (2010.01); C08L 95/00 (2006.01)

CPC G01Q 60/38 (2013.01) [C08L 95/00 (2013.01)]

9 Claims

1. A method for quantifying a degree of blending of virgin asphalt and aged asphalt in a hot recycled asphalt mixture (HRAM) and controlling a composition of the HRAM, the method comprising:

with a measurement module comprising a probe, measuring a microscale modulus of recycled asphalt, a microscale modulus of the aged asphalt, a microscale modulus of the virgin asphalt, and a content of the aged asphalt in the HRAM in situ;

determining a microscale modulus of the recycled asphalt in a fully blended state with a microscale modulus prediction module, the microscale modulus prediction module being programmed with a function of the measured microscale modulus of the virgin asphalt, the measured microscale modulus of the aged asphalt, and the measured content of the aged asphalt measured in situ;

with an acquisition module, determining the degree of blending of the virgin asphalt and the aged asphalt in the HRAM based on the microscale modulus of the recycled asphalt measured in situ and the microscale modulus of the recycled asphalt in the fully blended state; and

controlling a level of a binder included in the HRAM based on the degree of blending of the virgin asphalt and the aged asphalt in the HRAM;

wherein the function of the microscale modulus prediction module is constructed as follows, as a relational equation between the microscale modulus of the recycled asphalt in the fully blended state and the content of the aged asphalt;

preparing the recycled asphalt in the fully blended state with different contents of the aged asphalt;

obtaining the microscale modulus of the recycled asphalt in the fully blended state with different contents of the aged asphalt; and

establishing a mathematical relationship between the content of the aged asphalt and the microscale modulus of the recycled asphalt in the fully blended state by taking the content of the aged asphalt as the x-axis and the microscale modulus of the recycled asphalt in the fully blended state as the y-axis through nonlinear fitting:

where, E_DMT-mixis the microscale modulus of the recycled asphalt in the fully blended state: α is the content of the aged asphalt in the recycled asphalt; E_DMT-agedis the microscale modulus of the aged asphalt; E_DMT-virginis the microscale modulus of the virgin asphalt; and A and B are specific values.