Cullet-Filled Concrete

Abstract:

The paper considers how cullet of different particle-size distribution affects the concrete strength. Experiments have proven that large-particle cullet (1.25 cm or larger) could be used as an aggregate; the concrete strength will be on par with those of ordinary natural/crushed sand concrete. The paper proves the feasibility of injecting highly dispersed silica fume in combination with effective polycarboxylate-based superplasticizers in cullet-based concrete mixtures. Highly dispersed silica fume will positively affect the strength characteristics of concrete, as silica fume in cement rock reacts with Са (ОН)₂, which is released upon the hydration of the clinker minerals С₃S and С₂S; the reaction produces very strong compounds. Concretes containing up to 30% silica fume in combination with a superplasticizer will feature very high early strength. Use of strong aggregates with a 30% cullet content can produce strong concretes; after steamed, a concrete containing silica fume and polycarboxylate-based superplasticizer will reach 90% of the graded strength. Cement-rock microstructure studies show that the polymer component of the STACHEMENT 2280 superplasticizer will gradually transcend from the glass grains to the cement rock. The interface between the polymer-coated glass grains and the cement rock is blurred and barely present. This strengthens the glass-rock adhesion and improves the concrete strength. This is why cullet is recommended for use in the production of curb stones.

• Periodical: Materials Science Forum (Volume 992)
• Pages: 73-78
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.992.73
• Online since: May 2020
• Authors: V.N. Shishkanova*, M.V. Ivanko, Andrey Yu. Kozlov
• Keywords: Concrete, Glass Fiber-Reinforced Concrete, Resource-Saving Technologies, Silica Fume, Superplasticizers, Waste Glass

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