Author(s)

Shimaa Younis Megahed¹, Abolwafa Mohamad Elthakeb², Walid Alsayed Mohamed³, Mohammed Taha Nooman⁴, Walid Hessian Soufy⁵

¹Fayoum Future Institute, Fayoum, Egypt.
²Department of Reinforced Concrete, Faculty of Engineering, Al-Azhar University, Cairo, Egypt.
³Department of Irrigation and Hydraulics, Faculty of Engineering, Al-Azhar University, Cairo, Egypt.
⁴Department of Properties and Strength of Material Civil Engineering, Faculty of Engineering, Al-Azhar University, Cairo, Egypt.
⁵Housing and Building National Research Center (HBRC), Cairo, Egypt.

This research studies the impact of different types of coarse aggregate on the behavior of geopolymer concrete based on both fly ash (FA) and ground granulated blast furnace slag (GGBFS) in different marine environments. Aiming to solve the problems caused by the construction and demolition waste and the depletion of natural aggregates, in the present study coarse recycled aggregates is used to produce new green concrete with a fly ash-slag based geopolymer. By this examination, the research seeks to improve the quality and productivity of concrete used in construction and hydraulic projects. For this research, four mixtures containing different types of coarse aggregate in two different water environments were used. The utilized mixtures contained natural aggregate concrete (NAC) such as basalt and crushed marble. Also, recycled coarse aggregate concrete (RAC), which totally replaced natural aggregate, was presented in this paper such as crushed concrete and crushed ceramic. For this study, in the sieve analysis; specific and unit weights, was recorded. Furthermore, the mechanical properties were determined, using a compressive test that was conducted on the 7th, 28th, 56th and 90th days at different water environments; potable water (PW) and sea water (SW). Durability test was also performed for total absorption measurement. Results indicated that geopolymer concrete exhibits better strength in marine environments than in those of potable water. Results also showed that crushed marble (CMA) exhibits higher compressive strength and durability.

Geopolymer Concrete, Fly Ash, Ground Granulated Blast Furnace Slag (GGBFS), Sea Water, Natural Aggregate Concrete, Recycled Concrete Aggregate, Compressive Strength and Durability

Megahed, S. , Elthakeb, A. , Mohamed, W. , Nooman, M. and Soufy, W. (2019) The Impact of Marine Water on Different Types of Coarse Aggregate of Geopolymer Concrete. Journal of Minerals and Materials Characterization and Engineering, 7, 330-353. doi: 10.4236/jmmce.2019.75023.