Abstract
The permeability level and resistance of the concrete cutoff wall of earth dam on the penetration of fluids are crucial factors and have an essential effect on the stability of the concrete core. In this research, the simultaneous incorporation of nano-carbon black and nano-silica in the concrete with nine different mixing patterns is considered to investigate the permeability and mechanical properties of the concrete. Experimental results revealed that the addition of nanoparticles to the concrete considerably decreases permeability; while reducing the compressive strength in some mixtures and increasing the bending strength of the modified concrete in most of the studied cases.
Highlights
A concrete structure should be capable of service under ambient conditions and during the considered useful lifetime and have a suitable performance
The determination of the permeability factor as a parameter by which the easiness of the fluid passage through the concrete can be obtained is of high importance [19]. Various materials such as micro-silica, natural or industrial pozzolans, ash, nano-silica, carbon nanotubes, and other diverse materials are utilized as an alternative of a part of the consumed cement for the reduction of the concrete permeability and or the increase of the concrete strength already [20,21,22,23,24,25] but nano-carbon black and nano-silica have not been used simultaneously for this purpose yet and the investigation of the effects of these two nano-materials is the main objective of this paper
Due to the difference in their dimensions, nano-particles act as lock and fasteners, and nano-silica particles, which have smaller sizes, are located among the nano-carbon black particles and leave less space
Summary
A concrete structure should be capable of service under ambient conditions and during the considered useful lifetime and have a suitable performance. The determination of the permeability factor as a parameter by which the easiness of the fluid passage through the concrete can be obtained is of high importance [19] Various materials such as micro-silica, natural or industrial pozzolans, ash, nano-silica, carbon nanotubes, and other diverse materials are utilized as an alternative of a part of the consumed cement for the reduction of the concrete permeability and or the increase of the concrete strength already [20,21,22,23,24,25] but nano-carbon black and nano-silica have not been used simultaneously for this purpose yet and the investigation of the effects of these two nano-materials is the main objective of this paper
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