Mukhopadhyay, Tapas Kumar and Ghosh, S and Chakraborti, S and Ghatak, Sankar (2005) Effect of sodium silicate on the durability of common building bricks. Interceram: International Ceramic Review, 54 (4). pp. 262-267. ISSN 0020-5214

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Sodium silicate (2 mass-%)was incorporated into a brickfield clay-fly ash composition to study the influence on some physical properties which ultimately affect the durability of building brick. The addition resulted in higher compressive strength at room temperature (CCS), lower water absorption and saturation coefficient value in the temperature range of 1000-1050 °C, which may be taken as predictors of durability. Significant improvement in the extent of efflorescence was observed with sodium silicate addition at 1000 °C and above. The reduction in efflorescence may be attributed to the reduction in overall pore volume as well as to the possible formation of complex salts which are less apt to migrate to the surface. This also had the effect of minimizing the differential structure between surface and interior of the brick. Microstructure analysis revealed the presence of at least two different types of crystals in the glassy matrix. One was quartz crystals, while other needle-like crystallites were observed which might be anorthite, syngenite, seynite etc. phases crystallizing out of the liquid during cooling.

Item Type: Article
Uncontrolled Keywords: Microstructure; X ray diffraction; Fly ash; Raw materials ; Sodium silicate; Additive; Improvement; Fabrication; Property relation; Manufacturing; Efflorescence; Durability; Construction materials; Heavy clay ceramics; Brick; Experimental study
Subjects: Structural Clay Products
Divisions: Advanced Clay & Traditional Ceramics
Depositing User: Bidhan Chaudhuri
Date Deposited: 22 Mar 2012 09:52
Last Modified: 01 Mar 2016 11:50

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