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Universitat Politècnica de València (2015)

Estudio de las propiedades puzolánicas de una muestra de pomeca argentina

García Figueruelo, Beatriz

Titre : Estudio de las propiedades puzolánicas de una muestra de pomeca argentina

Auteur : García Figueruelo, Beatriz

Université de soutenance : Universitat Politècnica de València

Grade : Máster Universitario en Ingeniería del Hormigón 2015

Résumé
Pumice is a volcanic rock, which can be found in many parts of the world. Specifically, San Juan is a very arid area of Argentina with abundance of a type of pumice, “pomeca”. This is a poor area with a low quality housing for the poorest sectors, no reaching, in many cases, the minimum standards of habitability and comfort. It has been shown in other studies that pumice, as a volcanic rock with pozzolanic properties, can be used as an additive to cement to make both mortar and concrete, thus reducing the consumption of energy and resources, promoting regeneration of seismic disaster areas and boosting the local economy and social integration. In this paper it has been studied the physical and chemical properties of a sample of “pomeca" from San Juan as well as the analysis of its pozzolanic reactivity and the development of the mechanical properties of mortars made with the addition of this material. The characterization results show that pomeca has a high content of potentially active oxides, silicon, aluminum and iron, and a low insoluble fraction. In the XRD it is highlighted the presence of amorphous material as shown by the strong deviation of the baseline in the range of 2θ 15-35º. Values obtained in the pH and conductivity test measures of lime/pomeca aqueous suspensions show that the material is capable of fixing hydrated lime and create calcium silicates. The results of thermogravimetric analysis of lime/pomeca and cement/pomeca pastes confirm these data. Mortars made with pomeca as cement replacement present slightly lower workability. In the specimens cured at 20 °C a small decrease in compressive strength in cement mortar with 25% pomeca replacement was observed, respect control samples, around 6% at 90 days curing. However, at 40 °C, resistance values are similar to those in control samples after 28 days of curing. Regarding lime mortars, acceptable resistance values are obtained and the values acquired for 40 °C curing temperature are double than those at 20 °C. It can be concluded that the pomeca from the region of San Juan in Argentina is a material with good pozzolanic properties and that it is feasible to use both as an addition to cement mortars and making lime mortar, producing an economic and environmental profit by reducing cement consumption and using local raw materials, while promoting the local econom

Mots Clés  : Cemento , Puzolana natural , Reactividad puzolánica , Adicion cemento sostenible , Piedra pómez , Cement , Natural pouzzolan , Pouzzolan reactivity , Adition to suistanable cement , Pumice

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Page publiée le 7 mars 2020