Sodium silicate/polyurethane microcapsules synthesized for enhancing self-healing ability of cementitious materials

Optimization of stirring speeds and evaluation of self-healing efficiency

Journal article (2021)

Authors

Ahsanollah Beglarigale Istanbul Okan University
Doğa Eyice Dokuz Eylul University
Yoldaş Seki Dokuz Eylul University
Ç. Yalçinkaya Dokuz Eylul University, Materials and Environment - CEG
Oguzhan Copuroglu Materials and Environment - CEG
Halit Yazici Dokuz Eylul University
Research Group
Materials and Environment (CEG) (TU Delft)
Copyright: © 2021 Ahsanollah Beglarigale, Doğa Eyice, Yoldaş Seki, Ç. Yalçinkaya, Oguzhan Copuroglu, Halit Yazici
DOI
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https://doi.org/10.1016/j.jobe.2021.102279
Self-healing Cementitious materials Sodium silicate Microencapsulation
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Published Date

2021

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Materials- Mechanics- Management & Design

Research Group

Materials and Environment

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.