Date of Award
9-12-2024
Document Type
Thesis
Degree Name
Civil Engineering, MSCE
First Advisor
Zahid Hossain
Committee Members
Alan Meadors, Ashraf Elsayed
Call Number
ISBN 9798384080749
Abstract
In cold climates, concrete structures are susceptible to deterioration from the freezing and thawing of water within the concrete. The arrangement of air voids is crucial for the concrete to endure the freeze-thaw cycles. This research investigates changes in the air void system within concrete using a super air meter and the properties of both fresh and hardened concrete at various stages, including mixing and after pumping. Laboratory mixes used different dosages of air-entraining admixes and included Rice Husk Ash (RHA) as a supplementary material. Adding RHA to the mix resulted in a decrease in air content of about 2.2%, unit weight by 1.5%, and slump by up to 45%. After pumping we observe 60% agreement on reduction in air content with maximum reduction of 1.4%, while other rheological properties remained largely unchanged. The configuration of the boom and consolidation of concrete significantly influenced the variation in air content.
Rights Management
This work is licensed under a Creative Commons Attribution 4.0 International License.
Recommended Citation
Uddin, Mohammad Sarfaraz, "Air Content Variation in Concrete at Different Stages of Its Lifecycle" (2024). Student Theses and Dissertations. 63.
https://arch.astate.edu/all-etd/63
