Synergistic effect of micro-silica and Spinacia oleracea as eco-friendly environmental inhibitor in the enhancement of the electrochemical and mechanical properties of composite cement
•The use of FA and MS results improve its sustainability and waste management.•The CS and the gel/space ratio (X) at 90-days OPC-FA-10% MS composite cement.•The lowest values of corrosion rates were observed in the case of C0MS20 mix.•C0MS20 mix in presence of 600 ppm spinach extract increased the i...
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| Published in: | Construction & building materials 2023-08, Vol.392, p.131883, Article 131883 |
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| Main Authors: | , , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | •The use of FA and MS results improve its sustainability and waste management.•The CS and the gel/space ratio (X) at 90-days OPC-FA-10% MS composite cement.•The lowest values of corrosion rates were observed in the case of C0MS20 mix.•C0MS20 mix in presence of 600 ppm spinach extract increased the inhibition efficiency of steel rebar.
The present study examines the effect of fly ash (FA) and micro-silica (MS) as a potential cementitious material to fabricate the composite cements (CCP; OPC-FA-MS). The physical, chemical, mechanical, and electrochemical properties of CCP were studied using different techniques. The results indicate a significant increase in the compression strength (CS) and the gel/space ratio (X) upto 90-days for the composite cement OPC-FA-10% MS. While the mix containing 70% OPC-10% FA-20% MS (C0MS20) shows a significant decrease in X value and CS from 1 to 7 days, after that, the X value and compressive strength reveals a remarkable increase at 28–90 days. Moreover, scanning electron micrographs (SEM) shows that the utilization of FA with MS resulted in a much denser microstructure, leading to an increase in the compressive strength. Potentiodynamic polarization of steel rebars in the composite cements filtrate, OPC-10% FA-MS, at 5, 10, and 20 mass% MS, (BS0, CS0 and C0MS20, respectively), was performed at the room temperature in the absence and presence of 5% NaCl as a corrosive environment. The lowest values of the corrosion rates were in the case of C0MS20, due to the formation of a protective film on steel rebars significantly higher corrosion resistance for both free and chloride attack media. Scanning electron microscopy (SEM) of the C-steel immersed in the C0MS20 filtrate confirms its smoothness and better morphology. The protection efficiency of C-steel in the C0MS20 filtrate has been enhanced additionally in the presence of different concentrations of the eco-friendly inhibitor; spinacia oleracea extract. The synergistic inhibition impacts of spinacia oleracea extracts and 20% MS on the steel rebars corrosion were studied. |
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| ISSN: | 0950-0618 1879-0526 |