Análisis por SEM de concretos simples con sustitución parcial de escoria como agregado fino

Abstract

The focus of this research is the evaluation by means of scanning electron microscopy (SEM) of parameters at the microstructure level of concretes in this case simple, with partial substitution of slag as fine aggregate. This approach could be useful in the generation of concretes with higher strengths since the porosity generated in the material was observed and the relationship generated between the slag used and the other materials used for the preparation of the concrete was evaluated.

Ferronickel slag was implemented as fine aggregate, replacing conventional sand with a dosage of 5% slag, which allows establishing the influence through the SEM of the new aggregate on the concrete and on its compressive strength.

In the analysis of concrete and its behavior when subjected to a load or stress, most of them focus on evaluating mechanical parameters such as compressive strength and leave aside factors such as the microstructure of the material that can reach affect that parameter. Bearing this in mind, it is important to analyze the micro part of the concrete in greater detail since it can be determined how much the presence of voids or porosity influences the compressive strength of concrete, in the same way, this study will show some ways in which this porosity can be known and analyzed in order to be applied in new studies.

Finally, results were obtained on the compressive strength of conventional concretes and with slag dosing, which made it possible to analyze first the influence of this new material on the strength of concrete and secondly analyze and compare by means of SEM the porosity present in the two concretes. This made it possible to show that simple concrete with a dosage of 5% ferronickel slag can be implemented, since it reaches the design resistance.