US 11,753,337 B2
Electrically conductive concrete composition and system design for resistive heating of pavements with low volume fractions of carbon microfiber
Halil Ceylan, Ames, IA (US); Alireza Sassani, Ames, IA (US); Hesham Abdualla, Champaign, IL (US); Sunghwan Kim, Ames, IA (US); Ali Arabzadeh, Ames, IA (US); Peter C. Taylor, Ames, IA (US); and Kasthurirangan Gopalakrishnan, Minneapolis, MN (US)
Filed by Iowa State University Research Foundation, Inc., Ames, IA (US)
Filed on Dec. 6, 2019, as Appl. No. 16/705,443.
Claims priority of provisional application 62/840,989, filed on Apr. 30, 2019.
Claims priority of provisional application 62/805,518, filed on Feb. 14, 2019.
Prior Publication US 2020/0262753 A1, Aug. 20, 2020
Int. Cl. C04B 14/38 (2006.01); C04B 28/04 (2006.01); C04B 22/08 (2006.01); C04B 40/00 (2006.01); C04B 24/38 (2006.01); C04B 111/94 (2006.01); C04B 103/40 (2006.01)
CPC C04B 14/386 (2013.01) [C04B 22/085 (2013.01); C04B 24/383 (2013.01); C04B 28/04 (2013.01); C04B 40/0042 (2013.01); C04B 2103/408 (2013.01); C04B 2111/94 (2013.01)] 10 Claims
1. A concrete pre-mix composition comprising:
a cementitious material;
a plurality of conductive carbon microfibers mixed with said cementitious material, wherein said conductive carbon microfibers are present in the concrete pre-mix composition in an amount such that, when said concrete pre-mix composition is hydrated to form concrete and cured, the conductive carbon microfibers are dispersed in the cured concrete in an amount of 0.75% to 2.00% of total mass of the concrete, and wherein the conductive carbon microfibers have an aspect ratio of length (l)/diameter (d) between 400 and 1,800; and
an additive selected from the group consisting of a conductivity-enhancing additive, a viscosity-modifying additive, and an air-entraining additive, wherein the additive comprises calcium nitrite, aqueous solutions of the compounds of Alkali and Alkali Earth metals, or a combination thereof.