Development of a New Binder Using Thermally-Treated Spent Pot Liners from Aluminium Smelters

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Title: Development of a New Binder Using Thermally-Treated Spent Pot Liners from Aluminium Smelters

Author(s): A. Tagnit-Hamou and S. Laldji

Publication: Special Publication

Volume: 219

Issue:

Appears on pages(s): 145-162

Keywords: concrete; glass frit; mineral admixture; spent pot liner; sustainable development

Date: 3/1/2004

Abstract:
The use of mineral admixtures as addition to or replacement of portland cement has been attracting a great amount of interest in recent years. Using suitable quantities of those minerals not only improves some properties of fresh and dry concrete, but also reduces portland cement demand and helps solve several environmental problems. Aluminium production in various parts of the world generates a considerable amount of waste which contains leachable cyanides and fluorides that cause a serious environmental problem. This paper presents a study of the effect of substituting a percentage of cement by a glass flit in mortar and in concrete. The term glass frit refers to spent pot liners resulting from the aluminium production process, that have undergone various treatments and have been ground to the fineness of a cement. The various results obtained in different tests conducted on mortar and concrete showed that glass frit has a remarkable reactivity potential and an interesting rheological behaviour. Replacing a percentage of cement by glass frit improves workability and strengths of mortar and concrete. For a given slump, concrete containing 25% of glass frit requires 50% less water reducer than that of control concrete. The compressive strengths developed in mortar or in concrete are very similar or even greater than those made with portand cement only or those incorporating blast furnace slag with equivalent cement replacement rate.