Abstract
In this paper a hybrid combination of carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) was used for developing cementitious self-sensing composite with high mechanical, microstructural and durability performances. The mixture of these two nanoparticles with different 1D and 2D geometrical shapes can reduce the percolation threshold to a certain amount which can avoid agglomeration formation and also reinforce the microstructure due to percolation and electron quantum tunneling amplification. In this route, different concentrations of CNT + GNP were dispersed by Pluronic F-127 and tributyl phosphate (TBP) with 3 h sonication at 40 °C and incorporated into the cementitious mortar. Mechanical, microstructural, and durability of the reinforced mortar were investigated by various tests in different hydration periods (7, 28, and 90 days). Additionally, the piezoresistivity behavior of specimens was also evaluated by the four-probe method under flexural and compression cyclic loading. Results demonstrated that hybrid CNT + GNP can significantly improve mechanical and microstructural properties of cementitious composite by filler function, bridging cracks, and increasing hydration rate mechanisms. CNT + GNP intruded specimens also showed higher resistance against climatic cycle tests. Generally, the trend of all results demonstrates an optimal concentration of CNT (0.25%) + GNP (0.25%). Furthermore, increasing CNT + GNP concentration leads to sharp changes in electrical resistivity of reinforced specimens under small variation of strain achieving high gauge factor in both flexural and compression loading modes.
Highlights
Cementitious composites, as one of the most extensively used materials in the structure’s design and construction, are brittle and susceptible to cracking [1]
In order to overcome some of these drawbacks, a hybrid combination of carbon nanotubes (CNTs) + graphene nanoplatelets (GNPs) has been used as a conductive part in order to develop a novel high sensitive affordable cementitious composite with a low percolation threshold
GNP reinforced specimens specimens in different hydration period are presented in hydration period areare presented in in hydration period presented
Summary
Cementitious composites, as one of the most extensively used materials in the structure’s design and construction, are brittle and susceptible to cracking [1]. In order to overcome some of these drawbacks, a hybrid combination of CNT + GNP has been used as a conductive part in order to develop a novel high sensitive affordable cementitious composite with a low percolation threshold. The mixtures of these two nanoparticles with different 1D and 2D geometrical shapes can cause amplification of percolation and electron quantum tunneling which decreases the percolation threshold to a certain amount that can avoid agglomeration formation and reduce the production cost. The piezoresistivity behavior of the composite specimens was evaluated under compression and flexural cyclic loading tests
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