Browsing by Author "Faria, Paulina"
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- Avaliação da introdução de resíduo da indústria têxtil em argamassasPublication . Pereira, Cristiana Gonilho; Martins, Ana Isabel G.; Faria, Paulina; Fangueiro, RaulO setor têxtil produz uma grande quantidade de resíduos de natureza fibrosa e, embora a sua utilização na construção seja hoje uma realidade, a acumulação destes resíduos em aterros sanitários continua a ser uma preocupação. Tendo em vista o desenvolvimento sustentável, através da diminuição da acumulação destes resíduos e da promoção da sua reutilização, apresenta-se o desenvolvimento da aplicação de resíduos fibrosos com aplicação técnica, na construção. Este artigo apresenta a caracterização de argamassas de cimento reforçadas com fibras resultantes da indústria têxtil e pretende demonstrar a influência da dosagem de fibras no desempenho das argamassas.
- Cement based fiber-reinforced mortar: the fiber influence on the mortar performancePublication . Pereira, Cristiana Gonilho; Faria, Paulina; Fangueiro, Raul; Vinagre, Pedro; Martins, Ana Isabel G.
- Comparison of mineralogical, mechanical and hygroscopic characteristic of earthen, gypsum and cement-based plastersPublication . Santos, Tânia; Gomes, Maria Idália; Silva, António Santos; Ferraz, Eduardo; Faria, PaulinaIt is important to ensure indoor comfort by passive methods, avoiding mechanical equipment that has energy costs. To assess plasters common efficiency but also its contribution as moisture buffers, five different plastering mortars, including unstabilized and stabilized earth-based plasters, gypsum and cement-based pre-mixed plasters, were analyzed and their chemical, mechanical and hygroscopic characteristics compared. The materials and mortars were analyzed by X-ray diffraction and simultaneous thermal analysis. Linear shrinkage, dry bulk density, dynamic modulus of elasticity, flexural and compressive strengths, dry abrasion resistance, surface cohesion, surface hardness and sorption and desorption of mortars and plasters were also evaluated. The mechanical strength of earthen mortars is lower than gypsum and cement-based mortars. However, earth plasters show the highest hygroscopicity, acting as moisture passive buffers, improving thermal comfort and contributing to occupantś health.
- Influence of curing conditions on lime and lime-metakaolin mortarsPublication . Faria, Paulina; Martins, Ana Isabel G.Air-lime mortars with or without pozzolanic components were largely used in historic buildings. Due to natural or accidental degradation it is often necessary the application of repair mortars, durable and compatible with the masonries of historic buildings. Within this context and associating the improvement of mortars characteristics to the necessity of sustainable construction practices, some mortars formulated with lime and the addition of pozzolans have been studied. In previous papers, the influence of some types of air-lime (powder hydrated lime or lime putty) and the addition of metakaolin in lime mortars have been presented. Each type of mortar presents its specificities. In pure lime mortars the setting occurs by carbonation and in lime-metakaolin mortars it occurs both by carbonation and hydration. A crucial question in order to optimize the characteristics of the mortars (and its applicability) is related with the curing conditions. This article describes an experimental campaign with different pure air lime mortars and lime-metakaolin mortars, cured under different conditions of relative humidity and CO2 content. Properties of the mortars, mainly in terms of mechanical behaviour and open porosity, capillary water absorption and drying capacity, are obtained, compared and discussed. The benefits in some properties revealed by the different mortars are correlated with the laboratorial curing conditions and with in situ applications possibilities.
- Textile waste fiber-reinforced mortar: performance evaluationPublication . Pereira, Cristiana Gonilho; Martins, Ana Isabel G.; Faria, Paulina; Fangueiro, Raul