Sodium silicate/polyurethane microcapsules synthesized for enhancing self-healing ability of cementitious materials
Optimization of stirring speeds and evaluation of self-healing efficiency
Ahsanollah Beglarigale (Istanbul Okan University)
Doğa Eyice (Dokuz Eylul University)
Yoldaş Seki (Dokuz Eylul University)
Ç. Yalçinkaya (Dokuz Eylul University, TU Delft - Materials and Environment)
O. Copuroglu (TU Delft - Materials and Environment)
Halit Yazici (Dokuz Eylul University)
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Abstract
In this study, stirring speeds during the synthesizing process of the sodium silicate/polyurethane microcapsules were optimized. The yield values of microcapsules at different stirring rates were evaluated. Based on the yield values and shape of microcapsules, optimized microcapsules were obtained. The measurements of the shell thickness of microcapsules were performed on the fractured microcapsules by using scanning electron microscopy. The optimized microcapsules were further characterized by means of optical microscopy and nanoindentation. Load vs. displacement and modulus of elasticity vs. displacement characteristics of the microcapsules were obtained. The average modulus of elasticity was found to be 633 MPa. The self-healing efficiency of the optimized microcapsules was evaluated by means of compressive strength tests. The incorporation of microcapsules reduced the compressive strength of fiber-reinforced mortar by 12–22%. However, it was observed that the microcapsules enhanced the self-healing capacity (recovery in compressive strength) of the mortar.