The effects of ZnO2 nanoparticles on properties of concrete using ground granulated blast furnace Slag as binder

Abstract

In the present study, flexural strength together with pore structure, thermal behavior and microstructure of concrete containing ground granulated blast furnace slag with different amount of ZnO 2 nanoparticles has 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 impact the properties of concrete, ground granulated blast furnace slag was found to improve the physical and mechanical properties of concrete up to 45 wt. (%). ZnO 2 nanoparticles with the average particle size of 15 nm were added partially to concrete with the optimum content of 45 wt. (%) of ground granulated blast furnace slag and physical and mechanical properties of the specimens was measured. ZnO 2 nanoparticle as a partial replacement of cement up to 3 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 flexural strength of concrete. The increased the ZnO 2 nanoparticles' content more than 3 wt. (%), causes the reduced the flexural strength because of the decreased crystalline Ca(OH) 2 content required for C-S-H gel formation together with unsuitable dispersion of nanoparticles in the concrete matrix. ZnO 2 nanoparticles could improve the pore structure of concrete and shift the distributed pores to harmless and few-harm pores.

Effects of nano-TiO2 on strength, shrinkage and microstructure of alkali activated slag pastes

“…The investigation into the microstructure by Feng et al [24] demonstrated that the incorporation of TiO 2 decreases the quantity of inner micro cracks in Portland cement paste. Nazari et al [30] investigated the effect of nano-TiO 2 on physical, thermal and mechanical properties of concrete using ground granulated blast furnace slag replacing OPC, showing that TiO 2 accelerates the formation of C-S-H gel and improves the pore structure.…”

Thermal durability of OPC pastes admixed with nano iron oxide

“…In civil engineering field, most of the research works till date are conducted with nano-silica (nano-SiO 2 ) (NS) [7][8][9][10][11][12][13][14][15] and nano-titanium oxide (nano-TiO 2 ) (NT) [16][17][18][19][20][21]. On the other hand, a few studies were conducted with nano-Al 2 O 3 (NA) [7,[22][23][24][25][26], nanoFe 2 O 3 (NF) [27][28][29][30][31][32], nano-Fe 3 O 4 and nano-clay (NC) in comparison with those regarding NS or NT [33].…”

Impact Resistance of Cement and Gypsum Plaster Nanomodified by Water-Soluble Fullerenols

“…Analysis of the literature reveals a great number of ways of effecting concrete nanomodification by different nanoparticles, such as nanosilica (nano-SiO 2 ), 1−11 nanotitanium oxide (nano-TiO 2 ), 6,12−15 nanoiron (nano-Fe 2 O 3 ), 5,11,16,17 nanoalumina (nano-Al 2 O 3 ), 18−21 zirconium dioxide (nano-ZrO 2 ), 22,23 nano copper oxide (nano-CuO), 24−26 zinc peroxide (nano-ZnO 2 ), 27 magnetic nanoparticles (iron carbide, Fe 3 C/C, and cobalt carbide, Co/C), 28 nanoclay particles, 29,30 carbon nanoparticles, 31−36 and so forth. Jo et al, 4 Qing et al, 8 and Li et al 16 determined that nano-SiO 2 can improve concrete workability and strength to increase resistance to water penetration, to accelerate the hydration reactions of both C 3 S and ash-cement mortar, and to help to control calcium leaching.…”