Performance of green RPC containing nanoparticles and reinforced with hybrid fibers used for repairing damaged concrete
| Autor: | Mafaz Hani Abdullah, Eethar Thanon Dawood |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Hybrid fibers
Materials science Silica fume Materials Science (miscellaneous) 0211 other engineering and technologies 020101 civil engineering 02 engineering and technology 0201 civil engineering Flexural strength 021105 building & construction lcsh:TA401-492 Composite material SISAL Repairing computer.programming_language Cement Bond strength Epoxy Shear (sheet metal) visual_art visual_art.visual_art_medium Green reactive powder concrete Nanoparticles lcsh:Materials of engineering and construction. Mechanics of materials Cementitious computer |
| Zdroj: | Case Studies in Construction Materials, Vol 13, Iss, Pp e00428-(2020) |
| ISSN: | 2214-5095 |
| Popis: | Recently, there is an increased research awareness towards the use of high strength cementitious matrices like reactive powder concrete (RPC) for rehabilitation and repairing damaged structures in addition to their use in the maintenance of concrete structures. Therefore, this research has been conducted to present some RPC mixes prepared from various percentages of cement replacement, nanoparticles materials, and reinforced with three different types of fibers. The green RPC mixes were prepared with a total 30 % replacement of cement by silica fume, slag powder, and glass powder. Then, the addition of Nanoparticles combination as 2.5 % Nano glass powder (NG) plus 2.5 % Nano Iron slag powder (NS) was performed. Besides, the uses of mono micro steel fibers and hybridization of micro steel fibers (MSF), sisal fibers (SIF), and human hair fibers (HHF) were achieved. The combined systems of substrate concrete and such different green RPC mixes which were proposed here as repair materials besides epoxy were tested in bi-surface shear, oblique shear, flexural bond strength, splitting bond strength, and Pull-out. The results showed that the reinforcing of green RPC with hybrid nanoparticles (2.5 %NG + 2.5 %NS) and hybrid fibers (1.5 %MSF with 0.25 %SIF and 0.25 %HHF) boosted the best performances among green RPC mixes in bi-surface shear, oblique shear and Pull-out tests. Also, the said mix gives higher bond strengths between RPC with substrate concrete than that of epoxy by 2.273 %, 3.663 %, 6.168 % and 10 % through bi-surface shear, oblique shear, splitting strength and flexural strength, respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|