Granted Patent
B2
US 12,637,392 · App. 19/018,401 · Granted May 26, 2026
Electrically-conductive asphalt concrete containing carbon fibers
Inventors:
Halil Ceylan (Ames, IA); Ali Arabzadeh (Ames, IA); Sunghwan Kim (Ames, IA); Alireza Sassani (Ames, IA); Kasthurirangan Gopalakrishnan (Mangalagiri, IN); Mohammad Ali Notani (Ames, IA)
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Abstract
The present application relates to an electrically conductive asphalt mastic (ECAM) composition that includes an asphalt binder, a mineral filler, and a plurality of conductive carbon microfibers, between 3 and 12 mm in length, which are the sole source of electrical conductivity in the ECAM composition where the conductive carbon microfibers and the mineral filler are dispersed in the asphalt binder, and wherein said conductive carbon microfibers are present in the ECAM composition in an amount of less than 2.00% of total volume of the ECAM composition. The application further relates to an electrically conductive asphalt concrete (ECAC) composition that includes an asphalt binder, a mineral filler, an aggregate, and a plurality of conductive carbon microfibers, where the conductive carbon microfibers are the sole source of electrical conductivity in the electrically conductive asphalt concrete composition.
Claims (29)
1 . An electrically conductive asphalt concrete composition (ECAC) comprising:
an asphalt binder;
a mineral filler;
an aggregate; and
a plurality of conductive carbon microfibers, wherein said conductive carbon microfibers are the sole source of electrical conductivity in the electrically conductive asphalt concrete composition, and wherein the electrically conductive asphalt concrete composition has a volume resistivity of between about 15 Ω·cm and about 50 Ω·cm.
2 . The ECAC composition of claim 1 , wherein said conductive carbon microfibers are present in the electrically conductive asphalt concrete composition in an amount of less than 2.00% of total volume of the electrically conductive asphalt concrete composition.
3 . The ECAC composition of claim 1 , wherein the aggregate comprises a coarse aggregate and a fine aggregate.
4 . The ECAC composition of claim 1 , wherein the mineral filler comprises particles with a diameter of is-less than 75 microns.
5 . The ECAC composition of claim 3 , wherein the mineral aggregate comprises a fine aggregate having particles with a diameter of between 75 and 4,750 microns.
6 . The ECAC composition of claim 3 , wherein the aggregate comprises a coarse aggregate having particles with a diameter of between 4,750 and 37,500 microns.
7 . The ECAC composition of claim 3 , wherein the fine aggregate is selected from the group consisting of crushed rocks, sand, and combinations thereof.
8 . The ECAC composition of claim 3 , wherein the coarse aggregate is selected from the group consisting of coarse gravel, limestone, quartzite, granite, recycled geomaterials, and combinations thereof.
9 . The ECAC composition of claim 1 , wherein the conductive carbon microfibers are selected from the group consisting of polyacrylonitrile (PAN)-based carbon microfibers, pitch-based virgin carbon microfibers, recycled carbon microfibers, and combinations thereof.
10 . The ECAC composition of claim 1 , wherein the conductive carbon microfibers are between 3 and 12 mm in length.
11 . The ECAC composition of claim 1 , wherein the asphalt binder is selected from the group consisting of unaged asphalt binder, aged asphalt binder from recycled asphalt pavement, vacuum tower distillation bottom binder, aged asphalt binder from recycled asphalt shingles, de-asphalting bottoms, residuum oil supercritical extraction unit bottoms, and mixtures thereof.
12 . The ECAC composition of claim 1 , wherein the electrically conductive asphalt composition has a void filled with asphalt value of between 60.0% and 80.0%.
13 . The ECAC composition of claim 1 , wherein the electrically conductive asphalt concrete composition comprises less than 10.0 wt % of the asphalt binder.
14 . The ECAC composition of claim 13 , wherein the electrically conductive asphalt concrete composition comprises between 4.0 wt % and 8.0 wt % of the asphalt binder.
15 . The ECAC composition of claim 1 , wherein the aggregate is uniformly distributed throughout the electrically conductive asphalt concrete composition.
16 . A method of producing an electrically conductive asphalt concrete composition comprising:
providing the electrically conductive asphalt concrete composition of claim 1 ;
applying the electrically conductive asphalt concrete composition onto a surface to be paved; and
compacting the applied electrically conductive asphalt concrete composition.
17 . The method of claim 16 , wherein said providing the electrically conductive asphalt concrete composition comprises:
mixing the mineral filler, the aggregate, and the plurality of conductive carbon microfibers to form a carbon fiber-aggregate-filler blend;
drying the carbon fiber-aggregate-filler blend;
preheating the dried carbon fiber-aggregate-filler blend and the asphalt binder; and
mixing the pre-heated, dried carbon fiber-aggregate-filler blend and the pre-heated asphalt binder to form the electrically conductive asphalt concrete composition.
18 . The method of claim 17 , wherein the conductive carbon microfibers are between 3 and 12 mm in length.
Continuity (3)
Provisional Application
62878903
· Jul 26, 2019
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