Clasificación y uso del metakaolín como material suplementario en el hormigón: durabilidad.

Abstract

The purpose of this project is to evaluate the use of metakaolin, obtained by heat treatment at a temperature of 800° C of a kaolinite clay sample, as a supplementary cementitious material in the preparation of mortars, comparing and observing the behavior of the partial substitution with metakaolin in the mortar mix in terms of its durability properties. X-ray diffraction tests were carried out to determine the change in the chemical and mineralogical composition of the mortars with metakaolin substitution, identifying the main components, so that cubes and cylinders of mortar were made for the control sample and 10%, 15% and 20% substitutions of metakaolin, obtaining resistance values based on the cubic compression test at 56 days, and analysis of durability properties such as absorption, carbonation depth, resistance to freezing and thawing cycles, and permeability, with the main objective of defining the optimum substitution rate that provides the greatest benefits to the mortars. As a result of the tests carried out on the samples, it was obtained that the substitution percentage of 10% improves considerably the compressive strength and similarly for permeability tests, on the other hand, an optimum percentage of 20% substitution was obtained for absorption tests, which also determines physical properties such as void volume and density