Preparation of Core-Shell Structured Ceramsite Containing Soda Residue and its Chloride Ion Release Behavior

Abstract:

In this paper, a kind of core-shell structured ceramsite was proposed to reuse the soda residue and to control the chloride ion release, wherein the ceramsite has a core having a high content of soda residue and a vitrified shell. Experimental results showed that the amount of free chloride ions in the mixture containing 58%(by weight) of fly ash, 2%(by weight) of glass powder and 40%(by weight) of soda residue, after being mixed with water at the water/powder ratio of 0.5 and cured at 90% RH, 25°C for 7 days, was found to decrease from 5.92% to 2.84%. That is, the chloride ion was immobilized by the alkali activated fly ash in the mixture and the immobilization rate was as high as 52%. The core-shell structured ceramsite was prepared successfully with the above mixture as the core and the mixture of waste glass powder and shale as the shell and fired at 1120°C for 8 min. No chloride ion was detected in the eluent after the as-prepared ceramsite was soaked in deionized water at 25°C for 24h.

• Periodical: Key Engineering Materials (Volume 599)
• Pages: 328-333
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.599.328
• Online since: February 2014
• Authors: Jian Hua Yan*, Cheng Hao Zhang, Su Ping Cui, Gou Hua Rong, Ren Hai Yang, Peng Zhou
• Keywords: Alkali-Activation, Chlorine Ion, Core-Shell-Structured Ceramsite, Fly Ash (FA), Soda Residue

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