Development of High Strength Geopolymer Concrete using Nano Silica
Nancy T. Hussien1, Ahmed M. Ahmed2, Mohamed H. Agamy3, Gouda M. Ghanim4

1Nancy T. Hussien*, Teaching Assistant – Faculty of Engineering – Egyptian Russian University, Cairo, Egypt.
2Ahmed M. Ahmed, Assistant professor, Department of Civil and Infrastructure Engineering and Management, Faculty of Engineering and Applied Sciences, Nile University, Sheikh Zayed city, Giza, Egypt and Assistant Professor, Department of Civil Engineering, Faculty of Engineering at Mataria, Helwan University, Cairo, Egypt.
3Mohamed H. Agamy, Associate professorDepartment of Civil Engineering, Faculty of Engineering at Mataria, Helwan University, Cairo, Egypt.
4Gouda M. Ghanem, Professor of properties of material – Department of Civil Engineering, Faculty of Engineering at Mataria, Helwan University, Cairo, Egyptand Dean of El-Shorouk Academy for Engineering, Cairo, Egypt. 

Manuscript received on December 02, 2020. | Revised Manuscript received on December 05, 2020. | Manuscript published on December 30, 2020. | PP: 73-80 | Volume-10 Issue-2, December 2020. | Retrieval Number: 100.1/ijeat.A16591010120 | DOI: 10.35940/ijeat.A1659.1210220
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)

Abstract: Cement production became responsible of polluting the atmosphere by the emission of greenhouse gases. This issue motivate the researchers to work hard to develop a new cementitious materials used in concrete having much lower foot print in environmental pollution. This paper presents the development of high strength geoploymer concrete using nano silica. Ground granulated blast furnace slag (GGBFS) is used as main cementitious material and silica fume (SF) is used as cement replacement by different ratios. The alkaline activator is used in different temperature and samples cured by different methods. Nano silica then added to the optimum geopolymer concrete sample by ratios 1, 2 and 3% of the total weight of cementitious materials. Samples tested for mechanical properties. The results showed that using hot activator and oven curing samples gives higher mechanical properties. Also using nano silica up to 2% increases the compressive strength up to 24% at age 28 days. 
Keywords: Hot activators temperature, normal activators temperature, oven curing and ambient temperature curing.