Speaker
Description
This study evaluates fly ash blends including Class C fly ash, Class F fly ash, and a bottom ash processed to meet Class F fly ash classification as supplementary cementitious materials in air-entrained concrete by quantifying influence on air entrainment, air void development, compressive strength, and fracture network formation during mechanical failure. Foam Index tests determine the air-entraining admixture dosage required to achieve 3-6 % air content, and Super Air Meter tests quantify fresh air content and spacing factor. High resolution X-ray micro-computed tomography (micro-CT) scans of 4 inch by 8 inch cylinders are used to analyze detailed porosity, air void distribution and spacing (Figure 1), and to monitor microstructural changes before and after mechanical failure. Compressive strength testing of concrete is performed at multiple curing ages, with post-failure micro-CT imaging used to assess crack propagation and correlate with entrained air void structures. The findings highlight the role of fly ash chemistry and fineness in air void formation and stability, offering insights into designing durable and sustainable concrete.
| Country | United States of America |
|---|---|
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