The objective of the sensitivity analysis is to assess the reliability of the LCA results, determining how they are affected by uncertainties of the input data, allocation methods, environmental impact assessment methodology in order to properly establish conclusions and recommendations for the study.
In this study, the environmental impact is re-calculated using Ecoindicator99 (Ecoindicator99) and ReCIPE (ReCIPE) LCIA method. The results are reported in Figure 4. 25 for both methods and confirm the previous results obtained with
41% 24% 35%
NLAC_R
Crude oil, at production offshore Crude oil, at production onshore Remaining processesChapter IV- Structural materials: A life cycle assessment on lightweight concrete made of recycled lightweight aggregates
(a) (b)
Figure 4. 25: Ecoindicator99 and Recipe results. (a): Ecoindicator method; (b): Recipe method
4.8 Conclusion
In the present study the environmental impact of the production of different types of lightweight concrete materials is performed, i.e. NLAC and RLAC made with different recycled LWAs. With regard to LCA of LWAs, the results reveal that the production of recycled LWAs presents a significantly lower environmental burden with respect to the production of natural LWAs, mainly due to potential benefits of avoided impacts (raw material supply and waste disposal). In particular, the clay extraction and the production phase (including heating treatment and clay expansion with heavy fuel oil), influence the environmental results of natural LWAs.
Among the recycled LWAs the transport phase affects the relative efficiency of different mix options.
With reference to 1 m3 of lightweight concrete of C20/25 strength class, the 0% 20% 40% 60% 80% 100%
Human Health Ecosystem Quality
Resources
Ecoindicator Method_Lightweight concrete, Scenario 3 NLAC(MIX G) RLAC (MIX A) RLAC (MIX B) RLAC (MIX C) RLAC (MIX E) RLAC (MIX F) 0% 20% 40% 60% 80% 100%
Human Health Ecosystems Resources
Recipe Method _Lightweight Concrete, Scenario 3 NLAC(MIX G) RLAC (MIX A) RLAC (MIX B) RLAC (MIX C) RLAC (MIX E) RLAC (MIX F)
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