MODELLING AUTOGENOUS SELF-HEALING WITH DISSOLUBLE ENCAPSULATED PARTICLES USING A PHASE FIELD APPROACH

ANTONIO CAGGIANO; EDDIE KOENDERS; MIN YI; SHA YANG; UKRAINCZYK, NEVEN

Santa FE

Congreso; ENIEF 2019; 2019

In this paper, a modelling approach for autogenous self-healing is presented that is initiallybased on the healing potential of encapsulation of various cement particle fractions with time. Thehealing potential of a blended cementitious system will be provided that consists of original cementitiousparticles mixed with so-called Dissoluble Encapsulated Particles (DEPs). The self-healing principle ofthis system is based on a most basic healing concept, where the evolution of the healing material can beseparated into the late hydration of DEPs and the carbonation of calcium hydroxide. In this regards, aphase-field model is presented that is based on thermodynamics and kinetics of the prevailing chemicalreactions. The concept enables to predict the healing potential of DEPs inside a cement-based systemand analyse the most dominant parameters affecting the microscopic and macroscopic properties of (re-)hydrated microstructure. For this, the liquid-solid interfaces of the dissolution and/or precipitationmechanism is considered as a continuous density field driven by a reaction equation. The results showthe potential of the healing mechanism to bridge a certain crack width, and shows the ability of theproposed modelling approach for autogenous self-healing.