Scholarly record
THE EFFECT OF COAL ADDITIVE TYPE ON PROPERTIES OF CEMENT PASTES
Abstract
Concrete represents a traditional building material that is commonly applied due to its unique properties, like relatively high compressive strength and long-term durability. Such properties are gained because of its composition consisting of aggregate and cement. The usage of Portland cement, a worldwide available binder with annual production exceeding 4.6 billion tons, brings several environmental loads. One of them is releasing of an important amount of greenhouse gases into the atmosphere. Another environmental aspect is related to high demand on natural resources that start to be extensively depleted. Supplementary cementitious materials (SCM's), such as ground granulated blast furnace slag, various kinds of fly ashes, etc. are already commonly employed in cement and concrete manufacturing to reduce the impact on our environment. However, amounts of these SCM's are again limited. For these reasons, our attention was focused on the investigation of possible application of two types of waste coal additives ? coal dust and biochar. Their influence on material properties of produced cement pastes was investigated and compared in this work. In addition, both additives as well as hardened composites were studied in the term of their morphology and mineralogy with various analytical techniques. Obtained mineral compositions of hardened pastes indicate a clear impact of particular additive on formation of phases during hydration of Portland cement. Analyses, carried out on samples after 28 curing days, showed the reduction of bending and compressive strengths of pastes containing higher amount of both carbon-based additives. On the other hand, if only low quantities of additives were applied, pastes with beneficial properties were produced. Thus, carbon-based additives, applied in reasonable amounts, may help in the cleaner production of building composites with decreased environmental impact.
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References15
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