http://repositorio.lnec.pt:8080/jspui/handle/123456789/1007769 2026-09-07T00:35:35Z http://repositorio.lnec.pt:8080/jspui/handle/123456789/1019359 Title: Glass-fibre meshes for reinforcement of wall covering systems: applications, requirements, technical evaluation Authors: Veiga, M. R.; Malanho, S.; Mera Marques, A. Abstract: Glass-fibre meshes have been utilised for reinforcing various types of wall coverings, primarily to improve: cracking behaviour; impact resistance, and system cohesion/adhesion. These applications have increased with the continuous introduction of innovative systems in the market, which demand a wide array of properties. Examples include: renders and plasters based on cement, cement-lime, or gypsum; resin-based external wall coverings; External Thermal Insulation Composite Systems (ETICS); thermal insulation composite systems with thermal insulation mortars; panels for cladding. Different materials to be reinforced and different contributions for their performance, need specific requirements of the glass-fibre mesh, concerning, for example, mesh size, mass per unit area, tensile resistance, elongation at rupture, resistance to alkalis, durability and fire reaction. It is crucial to ensure the characteristics and durability that enable the reinforced covering systems to achieve the desired performance. For many years, Laboratório Nacional de Engenharia Civil (LNEC) has defined the requirements for glass-fibre meshes to be used in the reinforcement of various wall coverings and national technical agreements (Documentos de Homologação) have been issued accordingly. More recently, the European Organisation for Technical Assessment (EOTA) has published a European Assessment Document (EAD) titled “Glass-Fibre Meshes for Reinforcement of Cementitious or Cement-Based Renderings”, which covers part of the application field of these meshes and allows the issuance of European Technical Assessments (ETA). The article aims to analyse the requirements, and the available methodologies for the technical evaluation of meshes used in the reinforcement of wall coverings. Furthermore, it discusses future perspectives concerning the use of these elements. 2025-07-01T00:00:00Z http://repositorio.lnec.pt:8080/jspui/handle/123456789/1019349 Title: Adherence strength between an industrial render mortar with CDW aggregates and a ceramic substrate Authors: Farinha, C.; Silva, A.; PRIGENT, William; Infante Gomes, R.; Bastos, D.; Pederneiras, C.; Veiga, M. R. Abstract: The incorporation of construction and demolition wastes (CDW) as recycled aggregates (RA) in traditional mortars or concretes has been widely assessed in recent years. With this knowledge it is possible to move on to evaluate industrial products with these types of aggregates. In this research the composition of an industrial render mortar is modified to incorporate RA as aggregates. RA replaced part of the limestone aggregates originally used as natural aggregates. The replacement was by weight and the percentage ratio of 30 %, 50 % and 100 %. Three different CDWs were collected directly from recycling plants. Two of them were classified as mixed recycled aggregates and the other one as recycled concrete aggregate. This investigation is mainly focused on the influence of the RA incorporation in the mortars’ adhesive strength to a ceramic substrate, considering that the adhesive strength is an essential property for render mortars and directly determines their durability. The maximum feasible RA incorporation in each case, without affecting the mortar performance, was determined. The adhesive strength between the renders and the substrate was assessed according to EN 1015-12. It was concluded that until 30 % of replacement the adhesive strength is higher than 0.30 MPa for all mortars tested 2025-06-16T00:00:00Z http://repositorio.lnec.pt:8080/jspui/handle/123456789/1019337 Title: Characterization of the interior and exterior coating materials from 18th and 19th century of Casa do Moscadim. Case Study Authors: Farinha, C.; Veiga, M. R.; Santos Silva, A.; Moedas-Miguel, J. Abstract: Casa do Moscadim is a 18th-19th century manor house located in Chamusca, Portugal. Three main construction and decorative periods can be identified in the house: 1760s (construction of the original building and first period of mural paintings and tile decorations); 1790s (second decorative campaign); and 1880s (third decorative campaign). The architecture, construction type and materials are representative of the historical periods, building typology and region in which it is located. In its interior, the tile panels from the 18th and 19th centuries stand out, bonded with air lime mortars, generally in the most important rooms and in the staircase, as well as mural paintings from these periods. The tiles come from the royal factory “Real Fábrica do Rato”. All these aspects contribute to giving the house a notable cultural and historical value. 2025-09-02T00:00:00Z http://repositorio.lnec.pt:8080/jspui/handle/123456789/1019271 Title: From laboratory to site: Renders of Paimogo Fort, a case study Authors: Lopes dos Santos, A. R.; Veiga, M. R.; Tinoco, P.; Degortes, M. Abstract: The Paimogo Fort, is one of the several Portuguese military fortifications, built in the 17th century, with the intention to protect the Portuguese coastline territory from the constant military threat from the ocean. Abandoned since 19th century, it suffered severe damage. The latest renovation work, carried out in 2006, most of the original renders have been removed and replaced by new ones, based on hydraulic lime mortars, which show significant signs of deterioration, only few years later. Within the scope of the “Coast Memory Fort” EEA Grants project1, promoted by Lourinhã Municipality, which aims to safeguard and revitalize the Paimogo fort (EEA Grant), new repair mortars for wall renders were developed by the team of National Laboratory for Civil Engineering, that should fulfil the required functions: protection and aesthetics of the Fort walls. In this investigation, several in situ applications were made on the Fort external area, and their performance was assessed by a multidisciplinary team from different fields, with the aim to select the most balanced render formulations to be applied on the Paimogo Fort walls. The tests carried out to verify their efficacy and their compatibility with the original masonry and environmental conditions are presented; the main axes that structure the action and reflection of the working group for the intervention solutions are described; the final application aspects are presented. 2025-09-02T00:00:00Z