Image: Fly Ash FHWA dot gov
Description: Photomicrograph made with a Scanning Electron Microscope (SEM): Fly ash particles at 2,000x magnification. Fly ash is typically finer than portland cement and lime. Fly ash consists of silt-sized particles which are generally spherical, typically ranging in size between 10 and 100 micron (see Figure). These small glass spheres improve the fluidity and workability of fresh concrete. Fineness is one of the important properties contributing to the pozzolanic reactivity of fly ash.
Title: Fly Ash FHWA dot gov
Credit: http://www.fhwa.dot.gov/PAVEMENT/recycling/fach01.cfm
Author: United States Department of Transportation - Federal Highway Administration
Permission: US government: United States Department of Transportation - Federal Highway Administration
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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