Comparative Study on Chloride Binding Capacity of Cement-Fly Ash System and Cement-Ground Granulated Blast Furnace Slag System with Diethanol-Isopropanolamine
| Autor: | Liu Huaqing, Liu Jialong, Zhang Yan, Feng Zixia, Sen Kong |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Thermogravimetric analysis
Materials science Aluminate 0211 other engineering and technologies 02 engineering and technology Chloride lcsh:Technology Article chemistry.chemical_compound 021105 building & construction medicine General Materials Science lcsh:Microscopy chloride binding capacity lcsh:QC120-168.85 Cement lcsh:QH201-278.5 lcsh:T ground granulated blast furnace slag 021001 nanoscience & nanotechnology Compressive strength fly ash Chemical engineering chemistry diethanol-isopropanolamine Ground granulated blast-furnace slag lcsh:TA1-2040 Chemical binding lcsh:Descriptive and experimental mechanics Cementitious lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 medicine.drug |
| Zdroj: | Materials Volume 13 Issue 18 Materials, Vol 13, Iss 4103, p 4103 (2020) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma13184103 |
| Popis: | Steel bar corrosion caused by chloride was one of the main forms of concrete deterioration. The promotion of chloride binding capacity of cementitious materials would hinder the chloride transport to the surface of steel bar, thereby alleviating the corrosion and mitigating the deterioration. A comparative study on binding capacity of chloride in cement-fly ash system (C-FA) and cement-ground granulated blast furnace slag system (C-GGBS) with diethanol-isopropanolamine (DEIPA) was investigated in this study. Chloride ions was introduced by adding NaCl in paste, and the chloride binding capacity of the paste samples at 7 d and 60 d was examined. The hydration process was discussed via the testing of hydration heat and compressive strength. The hydrates in hardened paste was characterized by X-ray Diffractometry (XRD), Thermo Gravimetric Analysis (TGA), and Scanning Electron Microscope (SEM). The effect of DEIPA on dissolution of aluminate phase and compressive strength was discussed as well. These results showed that DEIPA could facilitate the hydration of C-FA and C-GGBS system, and the promotion effect was higher in C-FA than that in C-GGBS. DEIPA also increased the binding capacity of chloride in C-FA and C-GGBS systems. One reason was the increased chemical binding, because DEIPA facilitated the dissolution of aluminate to benefit the formation of Friedel&rsquo s salt. Other reasons were the increased physical binding and migration resistance. By contrast, DEIPA presented greater ability to increase chloride binding capacity in C-FA system, because DEIPA showed stronger ability to expedite the dissolution of aluminate of FA than that of GGBS, which benefited the formation of FS, thereby promoting the chemical binding. Such results would give deep insight into using DEIPA as an additive in cement-based materials. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |