A new durability assessment methodology of thermal mortars applied in multilayer rendering systems

• Type: Article in International Scientific Journal
• Date: 2019-10-20

Authors

Joana Maia (Author) FEUP; Nuno M. M.Ramos (Author) FEUP; R. Veiga (Author) Other

Journal

Title: Construction and Building Materials

Vol. 222

Pages: 654-663

ISSN: 0950-0618

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 0 Citations

ISI Web of Science

Scopus - 7 Citations

Other information

Authenticus ID: P-00Q-RAR

DOI: 10.1016/j.conbuildmat.2019.06.178

Abstract (EN): The increase of the thermal resistance of building envelopes is a result from the growing demand of energy efficiency. Several new materials and systems emerged in recent years as an answer to that growing need. Thermal mortars applied in thermal rendering systems are an example of how the research community and the building industry try to tackle that challenge. A gap in the durability assessment of thermal rendering systems can however be observed. The existing standardization for the durability assessment of mortars does not allow a consistent evaluation of thermal mortars, especially in multilayer systems. As such, the main goal of the present work consists in proposing a durability assessment methodology of thermal mortars applied as multilayer systems. Accelerated ageing cycles, directly applicable to thermal mortars, were developed through numerical simulation, taking into account material properties, climatic conditions and consequent degradation mechanisms to which the system is subjected. A theoretical methodology for the determination of heat-cold cycles that can represent specific climatic conditions was developed. The implementation of the developed accelerated ageing cycles and the obtained experimental results contributed to the definition of a new durability assessment methodology. This methodology defines the accelerated ageing cycles that should be performed in each climate zone, representative of the main degradation mechanisms. One of the major advantages is the temperature adaption of the accelerated ageing cycles to the climatic conditions. The new methodology contributes to the evaluation of new solutions, during their development stage, and to their adequacy for specific climatic conditions.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10