Abstract
Encapsulation of healing agents embedded in a material matrix has become one of the major approaches for achieving self-healing function in cementitious materials in recent years. A novel type of microcapsules based self-healing cementitious composite was developed in Guangdong Provincial Key Laboratory of Durability for Marine Civil Engineering, Shenzhen University. In this study, both macro performance and the microstructure of the composite are investigated. The macro performance was evaluated by employing the compressive strength and the dynamic modulus, whereas the microstructure was represented by the pore structure parameters such as porosity, cumulative-pore volume, and average-pore diameter, which are significantly correlated to the pore-size distribution and the compressive strength. The results showed that both the compressive strength and the dynamic modulus, as well as the pore structure parameters such as porosity, cumulative-pore volume, and average-pore diameter of the specimen decrease to some extent with the amount of microcapsules. However, the self-healing rate and the recovery rate of the specimen performance and the pore-structure parameters increase with the amount of microcapsules. The results should confirm the self-healing function of microcapsules in the cementitious composite from macroscopic and microscopic viewpoints.
Highlights
Concrete has been one of the most widely used building materials in the world owing to its low energy consumption, low cost, and relatively high durability [1]
It is seen that all the values of the porosity, pore volume, median value, and median value,ofand of with the pore size increase with the in the(0%, amount of average value the average pore sizevalue increase the increase in the amount of increase microcapsules
The microcapsules-based self-healing cementitious composite was developed in Guangdong
Summary
Concrete has been one of the most widely used building materials in the world owing to its low energy consumption, low cost, and relatively high durability [1]. Materials’ age and environmental effects result in concrete microcracks, local damage, and fracture. In actual concrete structures, micro-cracks are difficult to detect accurately because of the limitations of the detection technology; the conventional method cannot effectively repair the internal structure of these invisible microcracks. If these microcracks are not effectively repaired, it will affect the normal performance and service life of the structure, and may lead to macroscopic cracking and cause structural brittle fracture, and even lead to a catastrophic accident [2]. It is necessary to develop new repairing techniques and materials that are able to perceive material damage, and passively and automatically repair the damaged site, thereby restoring the mechanical properties and durability of concrete
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