Experimental Investigation of Fracture Toughness in Coal Combustion Ash Concrete Using 4D X-ray CT

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Title: Experimental Investigation of Fracture Toughness in Coal Combustion Ash Concrete Using 4D X-ray CT

Author(s): Soniya Tiwari

Publication: Web Session

Volume: ws_S24_SoniyaTiwari.pdf

Issue:

Appears on pages(s):

Keywords:

DOI:

Date: 3/24/2024

Abstract:
Chemical compositions of coal combustion ash (CCA) samples obtained from power plants throughout the United States were previously determined. Many of these materials do not qualify as class C and class F fly ash which limits the potential to repurpose this abundant waste material. In the present study, the CCA samples are used to replace 0, 20, and 40 % of portland cement in cement paste specimens. The rectangular specimens are cured for up to 28 days and tested using a Deben 5 kN loadcell three-point bending apparatus. During the experiments, the loadcell is placed inside an X-ray computed tomography (CT) scanner to capture the crack development during loading (Figure 1). The results from the flexural strength tests will be used to calculate fracture toughness and to correlate mechanical behavior to the chemical compositions to further the understanding of CCA waste valorization for structural applications in the built environment.




  


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