LOW-CEMENT DOSAGE REFRACTORY CONCRETE WITH LOW THERMAL CONDUCTIVITY

Autori: LUCIAN PAUNESCU(1*), ENIKO VOLCEANOV(2,3), BOGDAN-VALENTIN PAUNESCU(4), IOANA MONICA SURUGIU(5)

1. Cosfel Actual SRL, 95-97 Calea Grivitei, sector 1, Bucharest 010705, Romania
2. Metallurgical Research Institute SA, 39 Mehadia street, sector 6, Bucharest 060543, Romania
3. Faculty of Science and Materials Engineering, University “Politehnica” of Bucharest, 313 Independence Splai, sector 1, Bucharest 060032, Romania
4. Consitrans SA, 56 Polona street, sector 1, Bucharest 010494, Romania
5. Faculty of Computer Science, University “Politehnica” of Bucharest, 313 Independence Splai, sector 1, Bucharest 060032, Romania
* Corresponding author, email: lucianpaunescu16@gmail.com

Abstract

Super-aluminous refractory concrete (over 94 % Al2O3) with low dosage of cement (9 %) was made, its physical, thermal, and mechanical characteristics being considered suitable for the intermediate layer of a steel casting ladle: porosity of 29.31 %, the apparent density of 2.32 g·cm-3 thermal conductivity of 1.45 W·m-1·K-1, and compressive strength of 34.8 MPa (after heat treatment at 1500 ºC). The aim of the research was achieving a super-aluminous concrete with low-cement dosage, which would have acceptable thermal insulation properties, so that the heat loss through this refractory lining layer would be significantly reduced compared to the reference situation.

Cuvinte cheie

super-aluminous concrete low-cement dosage porosity thermal conductivity thermal insulation properties compressive strength