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Circular Economy
As for the salt crystallisation test, a great deterioration of the mechanical behavior of the specimens with mineral wool residues can be observed with respect to the reference specimens. Up to 20% more loss of strength is produced in the case of the rock wool test specimens, which are the ones that show the worst behavior in this test, even leading to collapse after cracking.
It has been observed that the values of water permeability are lower for mortars that incorporate mineral fiber residues with respect to the reference batch without fibers.
The mortars made with residues of fibers slightly decrease their resistance to adhesion, in relation to the reference mortar. The mortars with residues of fiberglass are those that lower resistance value present, this may be due to the fact that the adhesion, among other factors, is a consequence of the formation of crystals produced in the hydration of the binder, so the dosages with greater amount of fiber in mass develop lower resistance to adhesion.
In any case, all the mortars analyzed are above the minimum value set by the UNE EN-998-1 standard of 0.30 N / mm2, which makes them suitable for use.
The results show that the incorporation of mineral residues to a cement mortar matrix is a viable alternative for recycling.
4. References
López-Buendía, Angel M., María Dolores Romero-Sánchez, Verónica Climent, and Celia Guillem. 2013. “Surface Treated Polypropylene (PP) Fibres for Reinforced Concrete.” Cement and Concrete Research 54: 29–35. http://dx.doi.org/10.1016/j.cemconres.2013.08.004.
Papadopoulos, A. M. 2005. “State of the Art in Thermal Insulation Materials and Aims for Future Developments.” Energy and Buildings 37(1): 77–86.
Piña, Carolina et al. 2018. “Feasibility of the Use of Mineral Wool Fibres Recovered from CDW for the Reinforcement of Conglomerates by Study of Their Porosity.” Construction and Building Materials 191: 460– 68.
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