Corrosion resistant performance of high strength green concrete containing palm oil fuel ash
| dc.contributor.author | Kouch Aksaraei, Aliakbar Mahmoudi | |
| dc.date.accessioned | 2015-07-30T00:31:43Z | |
| dc.date.available | 2015-07-30T00:31:43Z | |
| dc.date.issued | 2014 | |
| dc.description.abstract | There is a possible demand for utilizing high volume replacement of Palm Oil Fuel Ash (POFA), a by-product and waste material of palm oil industries, as a pozzolanic material or mineral admixture by weight of Ordinary Portland Cement (OPC) to produce High Strength Green Concrete (HSGC). Nonetheless, due to lack of any appropriate and comprehensive study associated with the corrosion resistant performance of HSGC, this area of study requires more research. Hence, this study aims to investigate the corrosion resistant performance of HSGC containing high volume of Ultrafine Palm Oil Fuel Ash (U-POFA) up to 60% replacement by weight of OPC. In this regard, the original Palm Oil Fuel Ash (O-POFA) was treated to produce the U-POFA with 2.21 μm median particle size and capable to be classified as pozzolanic mineral admixture in accordance with ASTM C-618 class N, F and C. Also, four types of HSC sample were tested including 100% OPC as the control HSC mix, and HSC mixes containing 20%, 40% and 60% U-POFA replacing the OPC by weight. The compressive strength, porosity, water absorption and chloride permeability of the samples at the ages of 7 days, 28 days and 90 days were obtained. For corrosion performance assessment, the electrical resistivity, the accelerated corrosion current, the electrical resistance and the corrosion rate by mass loss method as well as the corrosion rate and polarization resistance by linear polarization method of the samples were investigated at the ages of 7, 28, 60 and 90 days. The results demonstrate that the concrete containing 20% U-POFA possesses higher compressive strength at all ages where samples containing 40% and 60% U-POFA can reach an equal compressive strength with the control concrete at 90 days. Also, porosity, water absorption and chloride permeability of the concrete will decrease by increasing the replacement dosage considerably. Moreover, this investigation has proven that utilizing high volume of U-POFA in HSC under the severe conditions of chloride attack and high voltage potential can strongly decrease the current and corrosion rates. In contrast, the U-POFA can increase the concrete resistivity and polarization resistance. Furthermore, the higher the U-POFA replacement provides the better corrosion resistant performance. In conclusion, it is confirmed that the HSC containing up to 60% U-POFA in comparison with the control sample possesses the same compressive strength at 90 days of curing, but giving significantly higher corrosion resistant performance, hence will reduce the cost and environmental pollution such as carbon dioxide emission and landfills pollution because of the lower amount of OPC consumption. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/879 | |
| dc.language.iso | en | en_US |
| dc.title | Corrosion resistant performance of high strength green concrete containing palm oil fuel ash | en_US |
| dc.type | Thesis | en_US |
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