Clasifcación y uso de metakaolin como material suplementario en el hormigón para el análisis de la resistencia a compresión.Revisión de estado del arte, muestreo de muestras para pruebas y proceso de transformación de arcillas caoliniticas a metakaolin.

Abstract

The main objective of this degree work was to determine and propose a percentage of metakaolin substitution for mortars with Type I cement to improve their compressive strength, starting from the obtaining of colinite clay to subsequently treat it thermally at 500°C and 800°C. °C and thus obtain the metakaolin. All tests were performed based on the Ecuadorian Technical Standard (NTE) and the American Society for Testing and Materials (ASTM) standard. The proposed substitution percentage was 10, 15 and 20% by weight of Type I cement with metakaolin at 500°C and 800°C for design resistance proposed in the ATSM C1157, which specifies that for hydraulic cements a resistance to compression 20 MPa at 7 days and 28 MPa at 28 days. The ages at which the compressive strength was studied were at 7, 28 and 56 days. The mortars with a substitution of 10 and 15% with metakaolin at 800°C had the best result, obtaining a resistance superior to 28 days of 28MPa, while the mortars with a substitution of 20% with metakaolin at 800°C obtained the resistance 28MPa at 56 days. In the same way, the mortars with a 10% substitution with metakaolin at 500°C formed a higher compressive strength of 28MPa at 56 days, the other designs with metakaolin at 500°C did not give a positive result to any of the test ages.