Abstract
This article focuses on the development of nanoalumina-based cement mortars for overlay applications in concrete floors. It focuses on the effect of applying aluminum oxide (Al2O3) nanopowder to the cement mortar used to make the overlay, on the adhesion of this overlay to concrete substrate and on its functional properties. It was claimed that the addition of 0.5% of Al2O3 nanopowder has a positive effect on the adhesion of the cement mortar used to make the overlay to the substrate made of concrete. The prior studies performed using scanning electron microscopy (SEM) confirmed that the reason for the improvement in adhesion is the fact that cement mortar used to make the overlay with the addition of 0.5% of Al2O3 nanopowder is less porous than the reference mortar within the interphase. The article concurs that the most favorable results, in terms of lower abrasion resistance and higher subsurface tensile strength of the cement mortar used to make the overlay, are mainly brought about by adding 0.5% of Al2O3 nanopowder.
Highlights
In construction, in terms of durability, cement mortar used to make the overlay should primarily have an adequate adhesion to the concrete substrate [1,2,3]
The tests were carried out on a model element with dimensions of 800 × 800 mm2. This element was made of cement-based composites: an overlay made of cement mortar and a substrate made of concrete
The article focuses on the effect of applying aluminum oxide (Al2 O3 ) nanopowder to cement mortar used to make the overlay, on the adhesion of this overlay to concrete substrate, and its effect on the functional properties of the cement mortar used to make the overlay
Summary
In terms of durability, cement mortar used to make the overlay should primarily have an adequate adhesion to the concrete substrate [1,2,3]. According to [4,5,6,7], the pull-off adhesion of cement mortar used to make the overlay to the concrete substrate should be at least 0.5 MPa for newly made overlays. According to recent literature, in order to obtain this adhesion at an appropriate level, mechanical treatment of the concrete substrate surface is applied [13,14,15]. Sandblasting seems to be the most advantageous for many surfaces [16], as demonstrated in [17] for layered cement composites, it is beneficial to use shot-blasting in order to most efficiently treat the concrete substrate
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