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Advances in Concrete Construction Volume 6, Number 4, August 2018 , pages 345-362 DOI: https://doi.org/10.12989/acc.2018.6.4.345 |
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Mechanical and durability properties of fly ash and slag based geopolymer concrete |
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Ahmet Emin Kurtoglu, Radhwan Alzeebaree, Omar Aljumaili, Anil Nis, Mehmet Eren Gulsan, Ghassan Humur and Abdulkadir Cevik
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| Abstract | ||
| In this paper, mechanical and short-term durability properties of fly ash and slag based geopolymer concretes (FAGPC-SGPC) were investigated. The alkaline solution was prepared with a mixture of sodium silicate solution (Na2SiO3) and sodium hydroxide solution (NaOH) for geopolymer concretes. Ordinary Portland Cement (OPC) concrete was also produced for comparison. Main objective of the study was to examine the usability of geopolymer concretes instead of the ordinary Portland cement concrete for structural use. In addition to this, this study was aimed to make a contribution to standardization process of the geopolymer concretes in the construction industry. For this purpose; SGPC, FAGPC and OPC specimens were exposed to sulfuric acid (H2SO4), magnesium sulfate (MgSO4) and sea water (NaCl) solutions with concentrations of 5%, 5% and 3.5%, respectively. Visual inspection and weight change of the specimens were evaluated in terms of durability aspects. For the mechanical aspects; compression, splitting tensile and flexural strength tests were conducted before and after the chemical attacks to investigate the residual mechanical strengths of geopolymer concretes under chemical attacks. Results indicated that SGPC (100% slag) is stronger and durable than the FAGPC due to more stable and strong cross-linked aluminasilicate polymer structure. In addition, FAGPC specimens (100% fly ash) showed better durability resistance than the OPC specimens. However, FAGPC specimens (100% fly ash) demonstrated lower mechanical performance as compared to OPC specimens due to low reactivity of fly ash particles, low amount of calcium and more porous structure. Among the chemical environments, sulfuric acid (H2SO4) was most dangerous environment for all concrete types. | ||
| Key Words | ||
| fly ash/slag based geopolymer concrete (FAGPC)/(SGPC); sulfuric acid; magnesium sulfate; sea water | ||
| Address | ||
| Ahmet Emin Kurtoglu: Department of Civil Engineering, Istanbul Gelisim University, Istanbul, Turkey Radhwan Alzeebaree: Department of Civil Engineering, Duhok Polytechnic University, Duhok, Iraq; Department of Civil Engineering, Gaziantep University, Gaziantep, Turkey Omar Aljumaili: Department of Civil Engineering, Gaziantep University, Gaziantep, Turkey Anil Nis: Department of Civil Engineering, Istanbul Gelisim University, Istanbul, Turkey Mehmet Eren Gulsan, Ghassan Humur. Abdulkadir Cevik: Department of Civil Engineering, Gaziantep University, Gaziantep, Turkey | ||
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