# Use of Eoofriendly Glass Powder Concrete in Construction of Wind Farms
## 4 Conclusions  
The results obtained in the tests carried out led us to confirm the initial research hypothesis, and the following conclusions:  
On the properties of fresh concrete:  
* The addition of glass powder, as a substitute for cement with particles of dimension d50 = 16 \(\upmu\)m, to the manufacture of the concrete, whatever its dosage, did not cause any improvement in terms of workability. In fact, the higher the glass powder replacement percentage, the worse the workability of the concrete;
* The air content was higher with higher substitution of cement for glass powder. This fact increased the resistance of the concrete to the atmospheric phenomena of freeze-thaw cycles, without the need to include additives to achieve this effect;
* Replacing cement with glass powder caused a higher air content. For this reason, the density of the different concretes varied, decreasing when the substitution of cement for glass powder increased; and
* The consistency tests by means of a settlement test allowed us to classify these concretes within the group of fluid concretes, regardless of the dosage of glass powder used.  
In terms of compressive strength:  
* The use of glass in the binder increased the long-term compressive strengths of concrete;
* The long-term compressive strengths of concretes containing glass powder were higher than [PERSON]'s ones, whatever the amount of glass powder that the binder contained. Therefore, glass powder exerted an important activity in increasing the long-term compressive strength of concretes. At up to 50% replacement of CEM I 52.5 R cement by glass powder, the compressive strength values obtained were important enough to classify these concretes in the group of building concretes. At above 50% substitution of CEM I 52.5 R cement by glass powder, the resistance values obtained allowed these concretes to be classified in the group of concretes for paving roads and highways;
* A mathematical model has been proposed to further analyze the experimental data. The model has proven to simulate quite well the results, as the errors were between 0.65% and 3.21% in relation to the calculated values of the final stable value of the compressive strength; and
* Due to all the characteristic described, this concrete is proposed as ideal as a surface protection layer against the action of corrosion in wind turbine foundations as well as the stabilization of the wind farm roads. The proposed use of this final waster as a binder in ecofriendly concrete has a global impact on circular economy and may reduce the emission of greenhouse gases, because the destiny of this waste would be landfill.  
Conceptualization, E.M.G.d.T. and M.I.M.-L.; methodology, D.A.-G., E.M.G.d.T., M.I.M.-L., S.G.-S. and S.P.; software, M.I.M.-L.; validation, S.G.-S., E.M.G.d.T. and M.I.M.-L.; formal analysis, E.M.G.d.T., M.I.M.-L. and D.A.-G.; investigation, D.A.-G., E.M.G.d.T., M.I.M.-L., S.G.-S. and S.P.; data curation, E.M.G.d.T. and M.I.M.-L.; writing--original draft preparation, D.A.-G., E.M.G.d.T., S.G.-S., M.I.M.-L. and S.P.; writing--review and editing, E.M.G.d.T. and M.I.M.-L.; supervision, S.G.-S., M.I.M.-L. and S.P. All authors have read and agreed to the published version of the manuscript.  
This research received no external funding.