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The advantageous influence of two different polycarboxylate and melamine superplasticizers is studied in relation to the properties of blended mortar plaster made with recycled polymers (polyamide powder and polyurethane foam). The characteristics of the test specimens are defined and tested in both a fresh and a hardened state. The influence of the additives on the microstructure of the lightweight mortar plaster is defined through an analysis of the compatibility of the interface zone of the materials using Fast Scanning Electron Microscopy (FSEM).Our results show that the addition of additives influences the properties of the mortar plaster, enhances its mechanical properties, and increases its adherence with ceramic materials. These results confirm that superplasticizers (depending on the type and dosage) enhance both the properties of the mortar plasters produced with recycled polymers and the rheological properties of the mortars that include polyamide waste.

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We use lime mortar in historic building’s interventions instead of cement mortars, due to its better compatibility with the masonry walls. The objective of the present research is to examine the behavior of a traditional lime mortar by the addition of polyamide powder waste. In certain circumstances we need to improve the mortar properties, such as increasing its impermeability while maintaining its breathability. This happens when we need to coat the filling of a stone wall that has been exposed to the outside. First of all we study the properties of a traditional lime mortar, as a reference. Then we replace aggregates using polyamide powder waste with different dosages. Subsequently we carry out some studies on the resulting mortars, through a series of tests, such as water vapour permeability and water absorption capacity through capillarity. Finally we check if the hydrophobic behavior improves, while maintaining the capacity of vapour transpiration.