A Novel Type of Alkaline Activator for Geopolymer Concrete Based on Zeolite
DOI:
https://doi.org/10.22034/advjse22032092Keywords:
Geopolymer concrete, Zeolite, Alkaline activator, Compressive strengthAbstract
Geopolymers, as a new class of green cement binders, have been considered as environmental-friendly alternatives to Ordinary Portland Cement (OPC) in recent years. They can potentially reduce negative environmental impacts of OPC; including carbon footprint and energy consumption. In the current work, effects of different alkaline activator solutions on the compressive, indirect tensile, and flexural strengths, water absorption, and resistance to an acidic condition of zeolite-based Geopolymer Concrete (GPC) were investigated. Additionally, a novel type of alkaline activator for GPC was introduced. In this regard, GPC specimens based on zeolite were manufactured and cured at 65 oC. The results showed that the addition of NaOH to the mixture after 3 min of mixing KOH and Na2SiO3 with dry components (1/3 of the total mixing duration) resulted in the highest compressive, tensile, and flexural strengths as well as the lowest water absorption capacity and weight loss under acidic condition, amongst other cases.
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