Avaliação do uso de aditivos biológico e químico no processo de cicatrização de fissuras no concreto

Abstract

Cracks are common pathologies in buildings and must be treated to avoid the emergence of secondary problems. The need for periodic maintenance to treat these cracks can be costly. Self-healing concrete can be an economical way to reduce the need for external interventions. Chemical and biological additions of self-healing agents can be incorporated into the concrete at the time of dosing. This work aims to evaluate the addition of the bacteria Bacillus Subtilis and the crystallizing additive Penetron to fresh concrete, which, after the crack appears and when it comes into contact with water, generates the concrete healing product. The study was carried out with the aim of identifying the efficiency of using Bacillus Subtilis with different concentrations and the use of Penetron in the manufacture of concrete. The application of additions after the concrete cracking process in the hardened state was also evaluated. The concrete specimens were cracked using compression, flexural traction and diametrical compression resistance equipment. After the healing process, the physical and mechanical properties were checked and the healing was visually evaluated. After obtaining and analyzing the results, it was possible to conclude the efficiency of using bacteria and their concentrations, as well as the use of the crystallizing additive.