Towards Better Understanding of the Amorphous Silica - Alkali Reactions and the Means of Preventing Glass Aggregate Expansion in Concrete

Coventry University and The University of Wisconsin Milwaukee Centre for By-products Utilization
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Conference Proceeding
Conference Proceedings - Second International Conference on Sustainable Construction Materials and Technologies, 2010, pp. 1 - 8
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The effect of quantity and characteristics of the components of amorphous silica â alkali reactions, based on the research carried at the CSIRO Laboratories in Australia and by the author are discussed. Conditions under which the expansion of silica-gel can be reduced to a safe level or even completely eliminated are presented. The emphasis is made on the commercially viable and the most economical means of the safe use of crushed soda-lime glasses (which account for about ninety percent of all manufactured glasses) as an aggregate in structural, durable and dimensionally stable concretes, in which hydraulic cements are used as a binder. With the depletion of good quality natural aggregates from quarries located in the proximity of construction and development sites, the use of recycled materials becomes particularly important in the current climate of global recession. It should be emphasized, however, that the results of these findings may not be universal, and when applied to the specific local conditions (both â glass and hydraulic cements) should be verified in the laboratory tests.
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