Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Municipal solid waste incineration bottom ash recycling in concrete: Preliminary approach with Oporto wastes
Highlights Potential recycling finely grounded MSWI-BA (GBA) in concrete mixtures as SCM. GBA is mainly constituted by silica, calcium alumina and iron. GBA incorporation as cement replacement provided workable pastes/mortars. GBA decreased mortars mechanical strength, due to extra porous and cracking related to metallic aluminium and mitigated ASR.
Abstract The present research explored the feasibility of using dry finely ground bottom ash (GBA) from municipal solid waste incineration as SCM for concrete mixtures in cooperation with a local waste management company, LIPOR. A first study was performed using GBA as a sole partial replacement for Portland cement in paste and mortar specimens. GBA showed both beneficial and detrimental effects on paste/mortar mixtures. In terms of fresh properties, water demand on paste and workability on mortar containing GBA as cement replacement kept the same as reference specimens paste/mortars. Setting time was not affected by GBA incorporation, and ASR expansion was mitigated. The disadvantageous effect, namely, mechanical strength loss on GBA mortar, was mainly due to metallic aluminium, found on the main oxide composition and SEM of GBA, which is associated with hydrogen gas evolution. Thus, the amount of aluminium content remaining in MIBA should be analysed even after the ageing process.
Municipal solid waste incineration bottom ash recycling in concrete: Preliminary approach with Oporto wastes
Highlights Potential recycling finely grounded MSWI-BA (GBA) in concrete mixtures as SCM. GBA is mainly constituted by silica, calcium alumina and iron. GBA incorporation as cement replacement provided workable pastes/mortars. GBA decreased mortars mechanical strength, due to extra porous and cracking related to metallic aluminium and mitigated ASR.
Abstract The present research explored the feasibility of using dry finely ground bottom ash (GBA) from municipal solid waste incineration as SCM for concrete mixtures in cooperation with a local waste management company, LIPOR. A first study was performed using GBA as a sole partial replacement for Portland cement in paste and mortar specimens. GBA showed both beneficial and detrimental effects on paste/mortar mixtures. In terms of fresh properties, water demand on paste and workability on mortar containing GBA as cement replacement kept the same as reference specimens paste/mortars. Setting time was not affected by GBA incorporation, and ASR expansion was mitigated. The disadvantageous effect, namely, mechanical strength loss on GBA mortar, was mainly due to metallic aluminium, found on the main oxide composition and SEM of GBA, which is associated with hydrogen gas evolution. Thus, the amount of aluminium content remaining in MIBA should be analysed even after the ageing process.
Municipal solid waste incineration bottom ash recycling in concrete: Preliminary approach with Oporto wastes
Mafalda Matos, Ana (Autor:in) / Sousa-Coutinho, Joana (Autor:in)
18.01.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
Municipal solid waste incineration bottom ash (MIBA) , Cement materials , Supplementary cementitious materials (SCM) , Waste recycling , Circular construction , AA , Alkaline activation , Al , Aluminium , ASR , Alkalis Silica Reaction , ASTM , American Society for Testing and Materials , Ca(OH)<inf>2</inf> , Calcium hydroxide , CTL , Reference mortar (100% cement) , EDX , Energy Dispersive X-Ray Analysis , FA , Fly ash , GBA , Dry ground municipal solid waste incineration bottom ash , GBA10 , Mortar incorporating GBA as 10% weight cement replacement , GBA20 , Mortar incorporating GBA as 20% weight cement replacement , GGBS , Ground granulated<hsp></hsp>blast furnace<hsp></hsp>slag , h , hours , HR , Relative Humidity (%) , LF , Limestone filler , LOI , Loss on ignition (%) , MSW , Municipal solid waste , MSWI , Municipal solid waste incineration , MIBA , Municipal solid waste incineration bottom ash , MSWI-FA , Municipal solid waste incineration fly ash , PC , Portland cement , P-CTL , Reference paste (100% cement) , P-GBA10 , Paste incorporating GBA as 10% weight cement replacement , P-GBA40 , Paste incorporating GBA as 40% weight cement replacement , PSD , Particle size distribution , SAI , Strength activity index (%) , SCM , Supplementary cementitious materials , SEM , Scanning electron microscopy , Si , Silicon , w/c , water to cement weight ratio , w/b , water to binder weight ratio
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