ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

Ceramics-Silikáty 43, (3) 117 - 122 (1999)


EFFECT OF BY-PASS CEMENT DUST ON THE PROPERTIES OF CLAY BRICKS
 
Elwan Mohamed 1, Abd-El Aziz Doaa 2, El-Didamony Hamdy 3
 
1 Tabbin Institute for Metallurgical Studies (TIMS), Helwan, Cairo, Egypt
2 National Research Center (NRC), Dokki, Cairo, Egypt
3 Zagazig University, Zagazig, Egypt

The suitability of the mixture of by-pass cement dust as non plastic material and the clay for the production of bricks was tested. Three mixtures having the compositions 100/0, 90/10 and 80/20 (wt.%) clay - cement dust were investigated. Hand moulded briquettes were dried and fired for 2 hours at 600, 700, 900 and 1000 °C with firing rate 2.5 °C min⁻¹. The physical and mechanical properties of the dried and fired articles were measured. The results show that the substitution of 10 wt.% clay by cement dust increases the gas permeability of the fired bricks, which prevents bloating, and increases the crushing strength of bricks with firing temperature up to 1000 °C. The substitution of 20 wt.% cement dust brings the decrease in the crushing strength.


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