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Effect of $Nano-SiO_{2}$/PVA on Corrosion Behavior of Steel Rebar Embedded in High-Volume Fly Ash Mortar under Accelerated Chloride Attack
| Content Provider | MDPI |
|---|---|
| Author | Huang, Jingjing Wang, Zhongkun Li, Dongsheng Li, Gengying |
| Copyright Year | 2022 |
| Description | In this paper, the influence of Nano-silica (NS) and Polyvinyl alcohol (PVA) fibers on the corrosion behavior of steel rebar embedded in high-volume fly ash cement mortars under accelerated chloride attack was studied by using an impressed voltage technique. The PVA fibers used were 1.0 vol.%, and two mass fractions of cement (50 and 60 wt.%) were replaced by fly ash. Four NS mass fractions (0, 0.5, 1.0, and 1.5 wt.%) were utilized in this paper. In addition, the mono and hybrid effects of NS and PVA on the mechanical properties and water absorption of mortar were also studied. The results showed that the incorporation of PVA and $nano-SiO_{2}$ can improve the flexural and compressive strengths of high-volume fly ash mortar. Generally, the flexural and compressive strengths increased with the increase of $nano-SiO_{2}$ content. Moreover, the incorporation NS can also reduce the capillary water–absorption rate of cement mortar. The impressed voltage corrosion test indicated that the composite incorporation of $nano-SiO_{2}$ and PVA can significantly delay the deterioration process of steel bars in mortar, effectively reducing the steel rebar’s corrosion level and increasing the exposure time of the surface crack. With hybrid-incorporation 1.0 vol.% PVA and 1.0 wt.% $nano-SiO_{2}$, the steel rebar had the lowest corrosion degree, which exhibited a mass loss of 49% and increased the broken time by 71% as compared to the control mortar. |
| Starting Page | 3900 |
| e-ISSN | 19961944 |
| DOI | 10.3390/ma15113900 |
| Journal | Materials |
| Issue Number | 11 |
| Volume Number | 15 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-05-30 |
| Access Restriction | Open |
| Subject Keyword | Materials Characterization and Testing of Materials Nano-sio2 Pva Fibers High-volume Fly Ash Cement Mortar Accelerated Chloride Attack Impressed Voltage Technique |
| Content Type | Text |
| Resource Type | Article |
