Title:
Multi-Level Assessment of the Influence of Moisture and Temperature in ASR-Induced Expansion and Deterioration
Author(s):
Olusola Olajide
Publication:
Web Session
Volume:
ws_S23_OlusolaOlajide.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
4/2/2023
Abstract:
Moisture and temperature are generally accepted as important factors that aids the intiation, sustenance and rate of Alkali Silica Reaction in concrete. Moisture greater than 80% relative humidity (RH) has been deemed needed. However, research is limited on the influence of temperature, reactivity level of aggregate and alkali level on this threshold. Furthermore, available works considers the external moisture which does not represent the true state of moisture in concrete and are also limited to the expansion recorded over time, ignoring the assessment of damage caused by the expansion. This presentation would highlight the relationship between internal and external moisture and their effect on the kinetics of ASR in concrete involving a range of reactive aggregate and alkali levels. Also, the assessment of damage (expansion, mechanical, and durability reductions) in concrete exposed to varying RH and temperature using microscopic and mechanical tools for the appraisal of moisture threshold would be discussed.