US 11,655,189 B2
Method for preparing hot-mixed asphalt mixture
Liping Liu, Shanghai (CN); Lijun Sun, Shanghai (CN); Qingbing Lu, Shanghai (CN); and Mingchen Li, Shanghai (CN)
Assigned to TONGJI UNIVERSITY, Shanghai (CN)
Filed by Tongji University, Shanghai (CN)
Filed on Aug. 10, 2020, as Appl. No. 16/989,479.
Claims priority of application No. 201910992801.3 (CN), filed on Oct. 18, 2019.
Prior Publication US 2021/0114932 A1, Apr. 22, 2021
Int. Cl. C04B 26/26 (2006.01); C04B 14/28 (2006.01); E01C 7/18 (2006.01); E01C 19/10 (2006.01)
CPC C04B 26/26 (2013.01) [C04B 14/28 (2013.01); E01C 7/182 (2013.01); E01C 19/1009 (2013.01)] 8 Claims
 
1. A method for preparing a hot-mixed asphalt mixture, comprising the following steps:
preheating asphalt and aggregates separately, wherein the aggregates comprise coarse aggregates and fine aggregates,
wherein the coarse aggregates are basalt having a particle size of 5-15 mm or a combination of limestone having a particle size of 3-5 mm and basalt having a particle size of 5-15 mm; and wherein the fine aggregates are limestone having a particle size of no larger than 3 mm;
subjecting the coarse aggregates, part of the fine aggregates and the asphalt that are preheated to a first mixing to obtain a first mixture;
adding only the remaining fine aggregates to the first mixture for a second mixing to obtain a second mixture; and
adding a mineral powder to the second mixture for a third mixing, and conducting discharging to obtain the hot-mixed asphalt mixture;
wherein a ratio of a total work of adhesion of the coarse aggregates and the part of the fine aggregates corresponding to asphalt during the first mixing to a total work of adhesion of the remaining fine aggregates corresponding to asphalt during the second mixing is in a range of 0.98 to 1.02, and the part of the fine aggregates have a surface area (SA) smaller than that of the remaining fine aggregates; the total work of adhesion is calculated by formula 1:
ΔG=ΣSAi·Wasi  formula 1;
and in formula 1, ΔG represents the total work of adhesion, mJ; SAi represents the SA of coarse aggregates or fine aggregates, m2; Wasi represents the work of adhesion of coarse aggregates or fine aggregates corresponding to asphalt, mJ·m−2; and Σ represents summation.