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Bonding of Cement Clinker onto Doloma‐Based Refractories
Author(s) -
Guo Zongqi,
Palco Stefan,
Rigaud Michel
Publication year - 2005
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2005.00255.x
Subject(s) - clinker (cement) , materials science , cement , lime , metallurgy , particle size , raw material , composite material , chemical engineering , chemistry , portland cement , organic chemistry , engineering
Adherence ability of cement clinker on doloma refractories was investigated using a specially designed sandwich test conducted at 1550°C for 30 min, under a load of 5.3 kPa. Fractional factorial experiments determined that silica ratio, particle size, and alumina ratio of raw meal had significant effects on the reactions between the clinker and the refractory. Silica ratio was found to be the most prominent factor influencing the adherence strength of the clinker on the surface of doloma bricks. Doloma refractory, having an excess of free lime, reacts with clinker to form additional C 3 S at the interface, which is greatly beneficial to adherence strength. The interface of doloma/clinker with low silica ratio is covered with a continuous MgO‐enriched layer, which is formed from the CaO reacting with the raw meal in presence of a large amount of liquid phase generated in the clinker. This layer reduced the adherence strength of clinker on doloma. With high silica‐ratio raw meal, clinker and doloma form a C 3 S‐rich layer at the interface, improving strongly the adherence strength of clinker on the brick.