Preparation and performance of graphene oxide/self-healing microcapsule composite mortar

Abstract

In order to solve the special needs for the durability and resistance of concrete materials in power transmission projects in Northwest China. Using sodium silicate and bentonite as capsule core and ethyl cellulose as capsule wall, microcapsules were synthesized by physical method. Standard specimens of cement-based materials were prepared by adding graphene oxide as conductive medium. Indoor experiments and micro technology were used to determine the optimal ratio of graphene-microcapsules, study the effects of graphene content, microcapsule content, and curing age on compressive strength, resistance, and self-repairing effect of the composite material. The results show that the average size of microcapsules was about 1.25 mm. The microcapsule was a relatively regular sphere with rough surface and dense structure. The recommended content was 2% microcapsules and 0.1% graphene oxide. With the increase of microcapsules and graphene oxide, the compressive strength first increased and then decreased, and the resistance increased gradually. After the cracks were repaired, the repairing rate of compressive strength was 57% and the recovery rate was 81%.