Title:
ASR Resistance of Ground Bottom Ash Based Alkali-Activated Concrete and the Prospect of Using MCPT for the Evaluation
Author(s):
Shubham Mishra
Publication:
Web Session
Volume:
ws_S23_ShubhamMishra.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
4/2/2023
Abstract:
The recent decline in fly ash and blast furnace slag production motivated us to pursue alternative, unconventional aluminosilicate materials as precursors for producing alkali-activated concrete (AAC). The mechanical and durability performances of such precursors-based alkali-activated concrete remain less investigated. The alkali-silica reaction (ASR) resistance of one of such unconventional ground bottom ash-based concrete is discussed in this study. Three ground bottom ashes (GBAs) with distinct oxide compositions were activated using sodium silicate and sodium hydroxide hybrid solutions. Four different aggregates with varying ASR reactivity are used. Miniature concrete prism test (MCPT-AASHTO T380) is used for monitoring ASR. All AAC mixtures produced significantly low expansions compared to OPC counterparts. Furthermore, we conducted microstructural investigations and pore solution analyses to validate the expansion results and understand teh ASR mechanisms in GBA-based AAC.