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首页> 外文期刊>Environmental impact assessment review >TiO_2 nanoparticles influence on the environmental performance of natural and recycled mortars: A life cycle assessment
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TiO_2 nanoparticles influence on the environmental performance of natural and recycled mortars: A life cycle assessment

机译：TiO_2纳米粒子对天然和再生砂浆环境性能的影响：生命周期评估

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The World Meteorological Organization has recently reported that greenhouse gases have reached their highest level since 3-5 million years ago. A continuing rise would cause serious consequences e.g., rising temperatures, death of living beings, or water pollution. Cement is associated with those levels since its production encompasses around 8% of global CO2 emissions. To increase the environmental performance of cementitious materials, different approaches could be followed, for instance, the reuse of waste materials such as recycled aggregate (RA) or the addition of TiO2 nanoparticles due to its proactive effect during service life. However, no research has been found that examined the effect of nano-TiO2 addition on recycled mortars in terms of environmental impact. Consequently, the main objective of this research is to evaluate the sustainability of TiO2 nanoparticles in mortars made with either natural or recycled aggregate. Twelve mixtures with different percentages of nano-TiO2 substitution (0%, 0.5%, 1%, 2% by the weight of cement) and RA replacement (0%, 50%, 100%) were studied. A life cycle assessment focused on material production (cradle-to-gate) was performed. The functional unit (FU) used was 1 m(3) of mortar with a given compressive strength. The mix design was modified to meet the fixed strength defined in the FU. In terms of global warming potential, mortars with RA reduced the environmental impact when 0.5% of nano-TiO2 was added. Considering waste generation and depletion of natural resources play a crucial role in the sustainability assessment of mortars with RA. Furthermore, when the compressive strength factor was considered in the FU, RA increased the total CO2 emissions due to the higher amount of cement needed. Finally, despite the apparent harmful effect of nano-TiO2 using a cradle-to-gate approach, these nanoparticles could highly enhance environmental performance due to their effects during service life.
机译：世界气象组织最近报道，自3-5百万年前以来，温室气体已达到其最高水平。持续的崛起会导致严重后果，例如，温度上升，生物死亡，或水污染。水泥与这些水平有关，因为它的产量包括约8％的全球二氧化碳排放。为了提高水泥材料的环境性能，可以遵循不同的方法，例如，由于其在使用寿命期间的积极效果而重复使用诸如再循环骨料（RA）或加入TiO 2纳米颗粒。然而，未发现研究在环境影响方面检查了纳米TiO2加法对再生砂浆的影响。因此，本研究的主要目的是评估用天然或再循环骨料制备的砂浆中TiO2纳米颗粒的可持续性。研究了12个混合物，纳米TiO 2取代百分比不同（0％，0.5％，1％，水泥重量）和Ra更换（0％，50％，100％）。进行了专注于材料生产（摇篮到门）的生命周期评估。使用的功能单元（FU）是1米（3）个砂浆，具有给定的抗压强度。修改混合设计以满足福中定义的固定强度。就全球变暖潜力而言，当加入0.5％的纳米TiO 2时，砂浆降低了环境影响。考虑到废物产生和耗尽自然资源在rail对迫击炮的可持续性评估中发挥着至关重要的作用。此外，当在富时考虑抗压强度因子时，由于所需的水泥量较高，RA增加了总二氧化碳排放量。最后，尽管纳米TiO2使用摇篮到栅极方法具有明显的有害影响，但这些纳米颗粒可以高度提高环境性能，因为它们在使用寿命期间的效果。

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