Seawater Exposure Effect on Fly Ash based Geopolymer Concrete with Inclusion of Steel Fiber

Zarina Yahya,Rafiza Abd Razak,Long-Yuan Li,Mohd Mustafa Al Bakri Abdullah,Leow Yee Jing

doi:10.1088/1757-899x/743/1/012013

Abstract

Concrete is widely used in construction offshore such as concrete floating bridges and sea tank. This research is providing an alternative construction material to replace ordinary Portland cement (OPC) concrete known as geopolymer. The geopolymer concrete was produced by mixing fly ash with alkaline activator and 3% of steel fibre in order to improve the properties of fiber reinforced geopolymer concrete (FRGPC). The effects of aging period in term of strength, changes in weight and carbonation of FRGPC in seawater is investigated and compared with the fiber reinforced concrete (FROPC). The compressive strength obtained for FRGPC were higher than FROPC. The highest compressive strength obtained by FRGPC is 76.87 MPa at 28 days and 45.63 MPa at 28 days for FROPC concrete. The compressive strength was decreased as the period of immersing the concrete in seawater is increased. During the immersion process of both samples in seawater up to 120 days, the carbonation was not detected even though with the existence of steel fibres.

Highlights

Green concrete was developed rapidly in recent years in order to reduce carbon footprint especially carbon dioxide (CO2) emission and limited landfill areas
When these source materials activated with alkaline activator solution it possesses binder properties which is similar with ordinary Portland cement (OPC)
This paper reports on the performance of fiber reinforced fly ash based geopolymer concrete (FRGPC) with 3% inclusion of wool steel fibers

Summary

Introduction

Green concrete was developed rapidly in recent years in order to reduce carbon footprint especially carbon dioxide (CO2) emission and limited landfill areas. Geopolymer has been introduced by Davidovits in 1978 where waste materials that rich in Silica (Si) and Aluminium (Al) was used as source materials. When these source materials activated with alkaline activator solution it possesses binder properties which is similar with ordinary Portland cement (OPC). The by-product materials such as silica fume, fly ash, rice husk ash, slag, red mud and natural minerals like kaolinite, albite, clays, feldspar and stilbite are the example of source materials [2,3,4,5,6,7]. Hardened binder is produced when the source materials were dissolved in an activating solution polymerizes into molecular chains and networks

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