The Effects of ZnO2 nanoparticles on strength assessments and water permeability of concrete in different curing media

Abstract

In this study, the effect of limewater on strength assessments and percentage of water absorption of concrete incorporating ZnO 2 nanoparticles has been investigated. Portland cement was partially replaced by ZnO 2 nanoparticles with the average particle size of 15 nm and the specimens were cured in water and saturated limewater for specific ages. The results indicate that ZnO 2 nanoparticles up to 2.0 weight percent could produce concrete with improved strength and water permeability when the specimens cured in saturated limewater while this content is 1.0 weight percent for the specimens cured in tap water. Although the limewater reduces the strength of concrete without nanoparticles when compared with the specimens cured in water, curing the specimens bearing ZnO 2 nanoparticles in saturated limewater results in more strengthening gel formation around nanoparticles causes improved permeability together with high strength. In addition, ZnO 2 nanoparticles are able to act as nanofillers and recover the pore structure of the specimens by decreasing harmful pores. Accelerated peak appearance in conduction calorimetry tests, more weight loss in thermogravimetric analysis and more rapid appearance of peaks related to hydrated products in X-ray diffraction results, all indicate that ZnO 2 nanoparticles could improve mechanical and physical properties of the specimens.

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

“…The study revealed that the presence of up to 2% TiO 2 has an inhibiting effect on the rate of hydration of C 3 S [37] . Previously, the effects of different nanoparticles on physical and mechanical properties of concrete specimens have been studied [38][39][40][41][42][43][44][45][46][47][48][49] . It has been shown that utilizing nanoparticles in concrete improves the mechanical properties of the specimens besides the improvement in microstructure and pore structure of the concrete specimens.…”

Determination of rheological properties of fresh concrete and similar materials in a vibration rheometer

“…If, in an extracted sample of mixture B, only 1% of oil containing an anticoagulant (e.g. HIDRAOL HD-20 or motor oil SAE 5W-40) is added to the mass of oil already contained in the mixture, the yield stress disappears completely and the sample spills onto the base, thus behaving as pseudoplastic fluid 22 .…”

“…Fresh concrete that is not under vibration begins to flow only when the yield stress value is exceeded [18][19][20][21][22] . Many authors have concluded that, when vibration is applied, the yield stress is reduced to the extent that concrete can flow due to its own weight.…”

Improvement compressive strength of cementitious composites in different curing media by incorporating ZrO2 nanoparticles

“…In our previous works [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] , the effects of different nanoparticles on physical and mechanical properties of concrete specimens have been studied. In this work, the influence of nano-ZrO 2 on compressive strength and physical, thermal and microstructural properties of binary blended cementitious composite cured in water and saturated limewater has been investigated.…”