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)
Assigned to IOWA STATE UNIVERSITY RESEARCH FOUNDATION, INC., Ames, IA (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.