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• Conformation of geopolymers with different water proportion and activator at low temperature.
Study of the mechanical properties of the different geopolymers conformed and selection of the optimal process which obtains the highest resistance.
• Conformation of the insulation material with the selected expanded aggregates and with the highest mechanical resistance geopolymer, for that purpose the expanded aggregates will be added to the chosen geopolymer until it reaches a limit of coherent workability.
• Study of the thermal conductivity, absorption coefficient and mechanical resistance of the different materials conformed to the different proportions of expanded aggregates, along with their physical properties.
• Obtaining of the optimal expanded aggregates addition to the geopolymer with proper physical, mechanical, insulation and durability characteristics.
3. Results and Discussion.
The monitoring of the detailed methodology, as well as the determinate study, have shown that the expanded aggregates obtained have good mechanical characteristics to be used as addition to the geopolymer, obtaining at the same time a relatively low density which will be essential to achieve the insulation of the final material. Furthermore, the geopolymer obtained from the activation of the ceramic industrial by-product has shown a proper resistance just as durability properties. In the combination of the materials previously mention a gradual and expected decrease of its density and conductivity with the increasing addition of expanded aggregates to the studied geopolymer has been observed. However, its mechanical resistance decreases with its addition. Therefore, and based on this, a practical limit has been set, in which the physical properties are not sacrificed and a low conductivity is obtained along with suitable physical characteristics; creating an insulation material with low CO2 emissions during its process and with the use of a high percentage of low cost industrial by-products.
4. Acknowledgments.
The group TEP 222 Materials and Mine Engineering appreciates the assistance provided by the Superior Polytechnic School of Linares, University of Jaen.
5. Bibliography.
Pupeschi S., Knitter R., Kamlah M. (2017), Effective thermal conductivity of advanced ceramic breeder pebble beds, Fusion Engineering and Design, Volume 116 pp 73-80.
Sturm, P., Gluth, G.J.G., Brouwers H.J.H., Kühne H.-C. (2016), Synthesizing one-part geopolymers from rice husk ash, Construction and Building Materials, Volume 124 pp 961-966.
Novais R. M., Buruberri L.H., Ascensão G., Seabra M.P., Labrincha J.A. (2016), Porous biomass fly ash-based geopolymers with tailored thermal conductivity, Journal of Cleaner Production, Volume 119 pp 99-107.
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