Congresos de la Universitat Politècnica de València, HAC2018 - V Congreso Iberoamericano de Hormigón Autocompactable y Hormigones Especiales

Por defecto: 
Diseño de mezclas de hormigones autocompactantes con alto contenido de adiciones minerales y áridos de diferentes naturaleza para desempeño en ambientes altamente agresivos
Javier Puentes Mojica, Jose Luis Calvo, M. Cruz Alonso Alonso

Última modificación: 28-02-2018

Resumen


The advances in the use of self-compacting concrete (SCC) increases its consumption in construction materials. The SCC has ease of placement and refinement of the microstructure due to the increase of the volume of paste and fines thus improving the resistance to the penetration of aggressive agents. Therefore, its use is not limited to usual scenarios but focusing also to environments with severe operating conditions as is the case of energy transport infrastructures, often located in remote and extreme places. These conditions of application and location restrict the type of materials to be used in the design of concrete: type of aggregates, type of cement, use of supplementary cementitious materials (SCM), etc. The development of SCC also must imply an increase in the sustainability of the construction process by promoting the use of binders with mineral additions and limestone filler , in order to reduce the total cement content (due to the reduction of CO2 emissions associated to cement production) thus decreasing their environmental footprint. However, the incorporation of SCM implies the need to ensure compatibility with the chemical additives, superplasticizers, while maintaining the fresh state properties. Another relevant factor is the type and characteristics of aggregates that significantly affect the workability of concrete. The aggregates provide an improvement in performance in a hardened state, but in some cases they modify the consistency losing the self-compactibility of the concrete.

The aim of this study is to evaluate the influence of the composition of the mixture components on the fresh and hardened properties of the SCC: 1) Interaction of the additives with cements with high mineral addition content (50%) of slag and fly ash; 2) the effect of the use of mixtures of aggregates with different origin, shape and composition that provide the special properties required concentrated solar power plants. Mixtures of aggregates, limestone, basalt and crushed Clinker have been considered along with additives that promote flowability, water reducers and density enhancement. Robust SCCs can be developed with high stability suitable for CSP application.

DOI: http://dx.doi.org/10.4995/HAC2018.2018.6324


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