The effects of CuO nanoparticles on properties of self compacting concrete with GGBFS as binder

Abstract

In this work, strength assessments and percentage of water absorption of high performance self compacting concrete containing different amounts of ground granulated blast furnace slag and CuO nanoparticles as binder have been investigated. Portland cement was replaced by different amounts of ground granulated blast furnace slag and the properties of concrete specimens were investigated. Although it negatively impacts the physical and mechanical properties of concrete at early age of curing, ground granulated blast furnace slag was found to improve the physical and mechanical properties of concrete up to 45 wt. (%) at later ages. CuO nanoparticles with the average particle size of 15 nm were partially added to concrete with the optimum content of ground granulated blast furnace slag and physical and mechanical properties of the specimens were measured. CuO nanoparticle as a partial replacement of cement up to 3.0 wt. (%) could accelerate C-S-H gel formation as a result of increased crystalline Ca(OH) 2 amount at the early age of hydration and hence increase strength and improve the resistance to water permeability of concrete specimens. The increased the CuO nanoparticles' content more than 3.0 wt. (%), causes the reduced the split tensile strength because of the decreased crystalline Ca(OH) 2 content required for C-S-H gel formation. Several empirical relationships have been presented to predict flexural and split tensile strength of the specimens by means of the corresponding compressive strength at a certain age of curing. More rapid appearance of the peaks related to hydrated products in X-ray diffraction results, all indicate that CuO nanoparticles could improve mechanical and physical properties of the concrete specimens.

RETRACTED: Effect of nano-CuO and fly ash on the properties of self-compacting mortar

“…It is the C-S-H gel formation in the presence of fly ash that reduces the water absorption of the blended mortar by reducing the porosity. This is in agreement with the results obtained by Nazari et al [19]. It is shown by the results that the addition of CuO nanoparticles decreased the water absorption of the specimens.…”

“…However, most of them have focused on using nano-SiO 2 (NS), nano-TiO 2 and nano-Fe 2 O 3 (NF) particles [15][16][17][18][19][20][21][22][23]; only few studies have been conducted on the potential of using copper oxide (CuO) nanoparticles in construction materials [17,24]. Copper oxide (CuO) can be found in dusts and galvanic sludge recovered after treating gas in areas which use scraps as raw materials, such as in steel factories and foundries [18].…”

“…investigated the effects of CuO nanoparticles on the properties of self-compacting concrete incorporating ground-granulated blast-furnace slag (GGBFS) as a binder. The results show that, replacing CuO nanoparticles up to 3.0 wt% can accelerate C-S-H gel formation associated with the increased crystalline Ca(OH) 2 amount at the early age of hydration and therefore enhances the strength and improves the water permeability of concrete specimens [19]. Kolovos et al [18] used CuO and ZnO as an addition in the cement raw matrix.…”

Influences of Ultrafine Slag Slurry Prepared by Wet Ball Milling on the Properties of Concrete

“…Consulting the literature [13][14][15][16], 10-60% of slag replace cement in concrete displays good performance, and the fineness of slag can also make a difference. In this study, the specimens of compressive strength and workability were concrete, and that of microstructure tests were corresponding paste.…”

Electrochemical hydrogen peroxide sensor based on a glassy carbon electrode modified with nanosheets of copper-doped copper(II) oxide

“…The corresponding plot for the electrode coated with Cu@CuO nanoparticles followed produce a definite, significant curvature compared with the electrodes mentioned above, i.e., the electron transfer resistance had increased significantly (curve c). This may arise from the resistance of the CuO nanoparticles, which do not facilitate the conduction of the charge [33].…”