Hybrid technique to produce bio-bricks using enzyme-induced carbonate precipitation (EICP) and sodium alginate biopolymer

Mohamed G.Arab^a,b, Maher Omar^a, Abduallah Almajed^c, Yousef Elbaz^a, Amira H.Ahmed^a

Department of Civil and Environmental Engineering, College of Engineering, University of Sharjah, 27272 Sharjah, United Arab Emirates.

Abstract

This study investigated the process of bio cementation using enzyme-induced carbonate precipitation (EICP) and sodium alginate biopolymer to produce bio-bricks for the use in the construction industry. This approach has the potential to provide an alternative to cement and fired clay bricks, especially in countries where sand is abundant. The mechanical behavior of the produced bricks was evaluated based on their unconfined compressive strength and flexural strength. Three-point flexural test results were in the range 1–2.5 MPa, which was similar to the flexure strength of 20% cement-treated beams. The results show that the produced bio-bricks are comparable to cement-treated beams in terms of their mechanical properties and can also be considered an eco-friendly alternative to conventional bricks.

Keywords: Urea hydrolysis, EICP, Bio-cementation, Soil improvement, Bio-grouting, Bio-bricks, Enzyme-induced carbonate precipitation, Biomineralization.