Browsing by Keyword "Porosity"
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Item Improvement of initial mechanical strength by nanoalumina in belite cements(2007-04) Campillo, I.; Guerrero, A.; Dolado, J. S.; Porro, A.; Ibáñez, J. A.; Goñi, S.; Tecnalia Research & Innovation; TRAZABILIDAD CIRCULARThe development of new environmentally friendly and energy efficient cements such as belite cements are being promoted due the environmental problems related to CO2 emissions in the manufacture of Portland cement. Although long-term hydrated belite cements show comparable and even better mechanical strength to ordinary Portland hydrated cements, they have low initial mechanical strength, which limits their applicability. In this work we analyse the potential of nanomaterials for activation of the initial strength of belite cements. Different nanoparticles are added to belite cement and both the microstructure modification of the resulting paste and the mechanical properties at early ages are studied. Our results show that the addition of nanoparticles can overcome the drawbacks of this type of eco-efficient cements making them competitive to OPC.Item The performance of steel-making slag concretes in the hardened state(2014-08) San-Jose, Jose Tomas; Vegas, Iñigo; Arribas, Idoia; Marcos, Ignacio; GENERAL; TRAZABILIDAD CIRCULARThe use of oxidizing slag from electric-arc furnaces as an aggregate is a sustainable option in the manufacture of concrete, the performance of which is similar to an ordinary aggregate concrete. This study examines the reuse of two different types of oxidizing slag in concretes designed for use in structural components and compares their performance against relevant specifications contained in current working standards. Fundamental aspects are discussed, among which density and workability that are related to the proportioning of the concrete and its mechanical and physical properties. The results show that overall concrete quality is maintained and that its performance is acceptable for the proposed application