Electro-Thermal Properties of Carbon-Fiber-Reinforced Mortar Prisms

Abstract

The thermal properties of electrically heated carbon-fiber-reinforced mortar prisms with 0.5%, 1.0%, 1.5% and 2.0% of their volumes are investigated. Each prism dimension is 40 mm x 40 mm x 160 mm. When the constant power of 30W is applied to two conductive-gel strips painted on the prisms' surfaces as the electrodes, for 5 min, the prisms show that: (1) their surface heating patterns have mostly the shape of two semi-circles centered at each of the electrodes; (2) their surface temperatures increase more for those with higher fiber percentages; (3) their surface's average temperature increments are the highest for the first 1 min of heating; (4) the lines representing the lowest and highest temperature zones and one of the normal lines to two electrodes record the highest temperature increment for the first 1 min of heating; (5) the temperature ratio of two points on the surface of each of four different percentage prisms has almost an unchanging value for all heating time periods especially when the two points are close to the volume defined by two electrodes; (6) the average temperature increments decrease with time. These facts are for all percentage prisms.