Abstract
At a time when the cement industry is largely responsible for the production of CO 2 in the construction sector, it is useful to make this production a reverse phenomenon: that is CO 2 capture. The CO 2 absorption process called carbonation, improves specific properties of the concrete during the conversion of carbon dioxide CO 2 into calcium carbonate CaCO 3 . Current environmental concerns motivate the study of carbonation in order to maximize the absorption of carbon dioxide. Moreover, lightweight concrete with bio-based products knows an interesting development in the construction field, especially as thermal insulation panels for walls in buildings. Before identifying and quantifying the basic physical characteristics of concrete made from miscanthus, it is necessary to optimize the composition of the product. The long-term stability as well as the reinforcement may be obtained by means of a mineralization process of the natural product: a preparation with a lime and/or cement-based material is necessary to reinforce the cohesion of the bio-based product. Mineralization process is described as well as the way of producing blocks for CO 2 capture by means of accelerated carbonation. Finally, concrete blocks produced with miscanthus mineralized aggregates offer interesting mechanical properties and minimal environmental impact.
Highlights
The construction sector is one of the largest and most active sectors in Europe
New test procedure [19] allowed following what really happens in the first minutes of contact between chips and water, because it exactly corresponds to the time of mixing for mineralization process: finest particles offer an absorption rate largely greater than larger particles (Fig. 5)
The mass of water is taken into account because the test is performed in a closed system: a device is set up to capture water lost by concrete blocks
Summary
The construction sector is one of the largest and most active sectors in Europe. In environmental terms, it represents 30% of carbon dioxide total production (2009). In the construction industry in general, selection of materials and waste management absolutely require a global reflection, from bottom (operations, resource processing and materials chemistry) and top (recycling, waste management). This is especially true as new modes of design in the construction industry (passive or positive energy buildings) require the use of materials whose energy impact should be minimized [1]. The use of bio-sourced aggregates such as miscanthus plant will decrease again the environmental impact of concrete blocks manufacture and increase insulating properties
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