ZrO2 nanoparticles' effects on split tensile strength of self compacting concrete

Abstract

In the present study, split tensile strength of self compacting concrete with different amount of ZrO 2 nanoparticles has been investigated. ZrO 2 nanoparticles with the average particle size of 15 nm were added partially to cement paste (Portland cement together with polycarboxylate superplasticizer) and split tensile strength of the specimens has been measured. The results indicate that ZrO 2 nanoparticles are able to improve split tensile strength of concrete and recover the negative effects of polycarboxylate superplasticizer. ZrO 2 nanoparticle as a partial replacement of cement up to 4 wt. (%) could accelerate C-S-H gel formation as a result of increased crystalline Ca(OH) 2 amount at the early age of hydration. The increased the ZrO 2 nanoparticles' content more than 4 wt. (%), causes the reduced the split tensile strength because of unsuitable dispersion of nanoparticles in the concrete matrix.

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

“…The properties of nano-ZnO 2 particles are shown in Table 2. Scanning electron micrographs (SEM) and powder X-ray diffraction (XRD) diagrams of ZnO 2 nanoparticles have been shown in the previous works 28,29 .…”

“…The chemical and physical properties of the cement are shown in Table 1. In addition, the distribution pattern of cement particles determined by BET method has been illustrated in the previous works [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] . Nano-ZnO 2 with average particle size of 15 nm producing from Suzhou Fuer Import&Export Trade Co., Ltd was used as received.…”

“…In our previous works [22][23][24][25][26][27][28][29][30][31][32][33][34][35] , we tried to investigate the effects of different nanoparticles such as SiO 2 [18][19][20][21] , TiO 2 [22][23][24][25] , Al 2 O 3 [26,27] , ZnO 2 [28] , ZrO 2 [29][30][31] , Fe 2 O 3 [32] , Cr 2 O 3 [33,34] and CuO [35] nanoparticles on different concrete admixtures. In the all works [22][23][24][25][26][27][28][29][30][31][32][33][34][35] , we found that nanoparticles can act as heterogeneous nuclei for cement pastes, further accelerating cement hydration because of their high reactivity, as nano-reinforcement, and as nanofiller, densifying the microstructure, thereby, leading to a reduced porosity. The most significant issue for all nanoparticles is that of effective dispersion.…”

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

“…when ZrO 2 nanoparticles react with Ca(OH) 2 produced from saturated limewater, the content of strengthening gel is increased because of high free energy of nanoparticles 28,29,38 . The compressive strength of N-W and N-LW series should be compared from two viewpoints:…”

“…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.…”