Synopsis Lignite fly ashes (LFA) often have self-cementing as well as pozzolanic properties, due to their high lime content. LFA is compatible with Portlandcement and can replace a significant percentage of cement in concrete in order to save energy and reduce costs. The properties of LFA, ground to highlight its hydraulic properties, have been investigated by means of strength and other tests on mortars and pastes, with various levels of replacement of OPC by LFA. Analysis by X-ray diffraction, differential thermal analysis-thermogravimetry and electron microscope-selected area electron diffraction methods indicated that the strength of OPC/LFA mortars is due to compounds of C-S-H gel formed by the reaction of free lime with silica, and from the hydration of dicalcium silicate which may exist in LFA. The early strength is attributed to hydrated calcium aluminate compounds and ettringite.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.