Abstract
The disposal and further recycling of concrete is being investigated worldwide, because the issue of complete recycling has not yet been fully resolved. A fundamental difficulty faced by researchers is the reuse of the recycled concrete fines which are very small (&lt; 1 mm). Currently, full recycling of such waste fine fractions is highly energy intensive and resulting in production of CO<sub>2</sub>. Because of this, the only recycling methods that can be considered as sustainable and environmentally friendly are those which involve recycled concrete powder (RCP) in its raw form. This article investigates the performance of RCP with the grain size &lt; 0.25 mm as a potential binder replacement, and also as a microfiller in cement-based composites. Here, the RCP properties are assessed, including how mechanical properties and the microstructure are influenced by increasing the amount of the RCP in a cement paste (≤ 25 wt%).
Highlights
The disposal and further recycling of concrete is being investigated worldwide, because the issue of complete recycling has not yet been fully resolved [1]
By relating heat flow to a 1 g of cement and not an entire recycled concrete powder (RCP) mixture it was possible to highlight the differences in the hydration process caused by the RCP
The sharp shape of RCP particles negatively influences water demand and our results indicate that w/b ratio increased as percentages of the RCP increased, which led to a higher shrinkage in the RCP samples than in the control samples
Summary
The disposal and further recycling of concrete is being investigated worldwide, because the issue of complete recycling has not yet been fully resolved [1]. The research presented here investigates how recycled concrete powder (RCP) modified by a high-speed mill (grain size < 0.25 mm) performs as a potential binder replacement, and as a microfiller in cement-based composites. Concrete is composed of 65 to 70 % coarse and fine aggregates, with the remainder consisting of a cement paste [7]. Additional RCP processing stages (e.g., crushing or grinding) can break grains down to a finer level, to a point at which water absorption no longer plays a significant role. Such RCP modification is conducted according to what specific purpose the material must fulfill. This paper discusses the RCP produced from recycled concrete that serves as a partial binder replacement or as a raw material for cement production
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