Abstract
This paper presents the influence of chloride ion penetration in geopolymer concrete. Fly ash as based material for geopolymer concrete was used in this mixture. Fly ash was mixed with sodium hydroxide (NaOH) 8 M and sodium silicate (Na 2 SiO 3 ) as the alkali solution. The sizes of cylindrical specimens were prepared with a diameter of 100 mm and 200 mm high. Some specimens were immersed in salt water at a concentration of 3.5%, and other control specimens were cured in tap water for 30, 60, 90, and 120 days. The mechanical properties were determined with compressive test which was conducted at 28, 30, 60, 90 and 120 days. Some durability tests were performed for porosity, chloride penetration, and pH measurement. It was found that geopolymer concrete has higher compressive strength than concrete made with Ordinary Portland cement (OPC). However, chloride penetration in geopolymer concrete is higher than OPC. The pH measurement showed that geopolymer concrete has less pH than OPC concrete. The porosity of concrete has been found to influence chloride penetration and pH of concrete.
Highlights
Concrete is one of the most widely used construction materials in the world
ordinary Portland cement (OPC) concrete was used as a control specimen to compare its compressive strength with geopolymer concrete
The compressive strength of geopolymer concrete decreases less significant than OPC concrete
Summary
Concrete is one of the most widely used construction materials in the world. In addition, ordinary Portland cement (OPC) is the main binding material in concrete. Fly ash is one of the construction materials, which is used commonly to produce geopolymer concrete [5]. Fly ash-based geopolymer concrete has many significant benefits such as environmental friendly, high-performance material solution, and economic benefits. Durability of geopolymer concrete in salt water is affected by its permeability. According to some previous research, fly ash-based geopolymer concrete has better durability than Portland-based concrete in aggressive environment such as sulphate, acid, and fire [9,10,11,12,13]. There are only few literatures discussing about the influence of salt water on chloride penetration in geopolymer concrete. This paper discusses factors affecting the strength geopolymer concrete in salt water
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