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Cement-cork mortars for thermal bridges correction. Comparison with cement-EPS mortars performance
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Resumo(s)
The aim of this paper is to demonstrate the advantage of cork-mortars for renderings when compared to
EPS-mortars, from a thermal characteristics point of view, namely in steady and unsteady conditions. It
was intended to develop specific rendering mortars able to be applied in thermal bridges to reduce condensation
effects and heat transfer in buildings envelopes. The impact of this solution is significant, especially
in building typologies as framed reinforced concrete structures. Cement mortars and cement-EPS
mortars are used as a reference as their properties are easily recognized compared to cement-cork mortars,
which are made with by-products from the cork industry. Several studies were made concerning
fresh and hardened state behaviour of mortars, namely: rheological and mechanical properties, microstructure
evolution with time and thermal behaviour. For a cement based mortar, different cork dosages
(from 0% to 80%) were tested (as sand replacement by mass). Microstructural analyses show that the
mechanical properties of cement-cork blends are not only controlled by cork’s low density, but also by
interaction of cork extractives with the cement hydration process. Thermal conductivity presents a linear
decrease for an increasing cork dosage in mortars. Concerning the effect on thermal delay, cork-mortars
seem to behave better than EPS-mortars.
Descrição
Construction and Building Materials 49 (2013), 315-327
Palavras-chave
Cement mortar Cork granulate by-product EPS beads Rheology Thermal behaviour Mechanical properties Microstructure
Contexto Educativo
Citação
Editora
Elsevier