A Novel Type of Alkaline Activator for Geopolymer Concrete Based on Metakaolin
Publish Year: 1400
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JCEMA-5-2_002
تاریخ نمایه سازی: 6 شهریور 1400
Abstract:
In recent years, geopolymers, as a new class of green cement binders, have been considered as an environmental-friendly alternative to Ordinary Portland Cement (OPC), which can potentially reduce negative environmental impacts of OPC, including carbon footprint and energy consumption. In this experimental research, effects of different alkaline activator solutions on the compressive, indirect tensile, and flexural strengths, water absorption, and resistance to an acidic condition of metakaolin-based Geopolymer Concrete (GPC) were investigated. Furthermore, a novel type of alkaline activator for GPC was introduced. In this regard, GPC specimens based on metakaolin were manufactured and cured at ۹۰ ˚C. The results showed that the addition of NaOH to the mix after ۳ min of mixing KOH and Na۲SiO۳ with dry components (۱/۳ 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.
Keywords:
Geopolymer concrete , Metakaolin , Alkaline Activator , Compressive strength , Resistance to acidic condition
Authors
Alireza Esparham
Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
Amir Bahador Moradikhou
Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.
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