Microstructural characterisation of lightweight granules made from masonry rubble

摘要: Abstract The pore structure of lightweight granules made from masonry rubble was studied in order to better understand their engineering properties. Thermally and hydrothermally hardened were tested. Analysis by ESEM, mercury porosimetry sorption methods yield important insight into microstructure. thermal are characterised partly melted vitreous areas large internal macropores that connected via narrow throats. They show a marginal specific surface area along with hydrophobic behaviour. In contrast, the hydrothermal have an accessible mesoporous system containing plate-like ink-bottle pores. shape water isotherms depending on granules’ CaO content is sensitive morphology calcium silicate hydrate phases (CSH). hysteresis changes loop closes at low pressures, which can be attributed coarser more crystalline CSH, triangular-shaped pressure hysteresis, characteristic for fine fibre-like CSH morphologies. Granules higher surfaces but those stronger physisorption molecules.