Title The influence of municipal solid waste incineration bottom ash on portland cement hydration and binder properties
Authors Malaiškienė, Jurgita ; Antonovič, Valentin ; Boris, Renata ; Stonys, Rimvydas
Full Text Download
Is Part of 2nd International conference on Innovation in low-carbon cement & concrete technology, London, 8 - 10 July 2024 : book of abstracts.. London : University College London. 2024, p. 10
Keywords [eng] municipal solid waste incineration bottom ash ; road binder ; cement hydration ; density, compressive strength
Abstract [eng] By 2012, around 1.3 billion tons of municipal solid waste incineration bottom ash (MSWIBA) had accumulated globally, and with new waste-to-energy plants, it is expected to reach 2.2 billion tons by 2025. While MSWIBA is typically stored in landfills, there is a growing interest in using it in the construction of road pavements and, more importantly, in cement-based materials widely used in construction. The chemical composition of the MSWIBA landfilled for 6 and 18 months turned out to be quite stable. The amount of gamma radionuclides identified in MSWIBA meets the requirements of hygiene norms, thus proving that bottom ash from municipal incinerator can be used without any restrictions. The aim of this work is to analyse the influence of MSWIBA on cement hydration when bottom ash content in the mixture is 60%, and develop a binder suitable for road building. This work investigates the procedure of milled MSWIBA preparation for the road binder and calorimetric, thermogravimetric, X-ray Rietveld, as well as physical and mechanical properties of the binder. The rapid hardening hydraulic road binder with compressive strength of approximately 10 MPa after 7 days and 20 MPa after 28 days meets the requirements of EN 13282-1 for the E2 strength class. The main component of this binder is 60% MSWIBA. The addition of 5% quicklime reduces the destructive effects of metallic aluminium, which is inevitably present even in the treated MSWIBA and causes swelling of the hydrating cementitious binders. The amount of amorphous binder phase compared to control samples after 28 days increased about 50%, however, the amount of portlandite decreased about 8 times. The enthalpy at the portlandite decomposition temperature decreased about 10 times. The control sample had a cumulative heat release value of 273 J/g, whereas the road binder with 60% MSWIBA released 174 J/g.
Published London : University College London
Type Conference paper
Language English
Publication date 2024