CaCO₃ nanoparticles as filler have received considerable attention for the mechanical improvement that they provide to cements. However, their life-cycle impact on the environment remains almost unexplored, even if the cement industry is considered one of the largest CO₂ emitters. In this perspective, this research work assessed a novel method for using CO₂ from cement flue gases to produce nanoCaCO₃ as cement filler within the cradle to cradle thinking. For this purpose, two routes of CO₂ capture were assessed followed by the study of the synthesis of CaCO₃ through a mineral carbonation. Three scenarios for the synthesis of CaCO₃ nanoparticles were assessed targeting the use of waste or by-products as raw materials and recirculation of them to reduce any kind of emission. The three scenarios were evaluated by means of the Life Cycle Assessment methodology. Once the best considered route for nanoCaCO₃ production was determined, this research work examined the environmental effect of including 2 wt% of CaCO₃ nanoparticles into the cement. Closing the loop follows a circular economy approach since the CO₂ is captured within the same cement factory. The results were compared with conventional Portland cement. Regarding nanoCaCO₃ results, the scenario with simultaneous production of NH₄Cl, and using as calcium source CaCl₂ deriving from the soda ash Solvay process, proved to be the best option. Moreover, when cement was filled with 2 wt% of this nanoCaCO₃, the benefit in terms of emission reductions in the Climate Change category was higher than 60 % compared to the conventional Portland cement.

作为填料的CaCO ₃纳米颗粒因其提供给水泥的机械​​性能而受到了相当大的关注。但是，即使水泥工业被认为是最大的CO ₂排放者之一，它们的生命周期对环境的影响仍几乎未被开发。从这个角度出发，这项研究工作评估了一种利用水泥烟道气中的CO ₂在支架到支架的思想中生产nanoCaCO ₃作为水泥填充剂的新方法。为此，评估了两种捕获CO _2的途径，然后研究了通过矿物碳酸化合成CaCO ₃的方法。合成CaCO _3的三种方案对纳米颗粒进行了评估，以使用废物或副产品作为原材料并将其再循环以减少任何种类的排放为目标。通过生命周期评估方法对这三种方案进行了评估。一旦nanoCaCO最好考虑路线₃的产量决定的，这项研究工作检查包括Caco的2％（重量）的环境影响_3个纳米颗粒进入水泥。由于将CO ₂捕获在同一水泥厂内，因此闭环遵循循环经济方法。将结果与常规波特兰水泥进行了比较。关于nanoCaCO _3的结果，同时产生NH ₄ Cl并使用CaCl ₂作为钙源的方案源自苏打灰苏威工艺，被证明是最佳选择。此外，当水泥中填充有2 wt％的这种nanoCaCO _3时，与传统的波特兰水泥相比，气候变化类别在减排方面的收益高于60％。