Influence of the Addition of Hydrated Lime on the Adhesion of the Preparation of the Roughcast Base and Mortar for Coating

ABSTRACT

Considering the technologies related to wall coverings in buildings, the importance of preparing the base roughcast is important. However, the importance of the other layers of the mortar coating system cannot be disregarded in the tensile strength, with more emphasis on the cases on the facades. Adherence is basically related to the executive technique employed and the materials, highlighting the cement and water content added in the trace, considering that the penetration of colloidal water in the pores of the base, providing microancorating (mechanical locking of sulfo-aluminate crystals of hydrated calcium or ethringtite and hydrated calcium silicate, according to the principle of the pores active) and governs in bond. It can be highlighted some benefits of roughcast on the adhesion of coatings: (i) shear resistence of the, function of Roughness (macroarmage); (ii) uniformity of coating absorption; (iii) part of the physical barrier of the façade cladding system. This research aimed to verify the influence of pure lime addition in relation to cement mass, roughcast and roughcast more plaster system, on the contents (0%, 5%, 10% and 15%) on walls with ceramic and concrete blocks. The results indicated the importance of adding lime as an increase in tensile bond strength of mortar coatings [¹].

Keywords
Adherence; mortar; hydrated lime