Recycling of fresh concrete slurry waste as supplementary cementing material: Characterization, application and leaching of selected elements

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F21%3A00351875" target="_blank" >RIV/68407700:21110/21:00351875 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/60461373:22310/21:43923432

Výsledek na webu

<a href="https://doi.org/10.1016/j.conbuildmat.2021.124061" target="_blank" >https://doi.org/10.1016/j.conbuildmat.2021.124061</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.conbuildmat.2021.124061" target="_blank" >10.1016/j.conbuildmat.2021.124061</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Recycling of fresh concrete slurry waste as supplementary cementing material: Characterization, application and leaching of selected elements

Popis výsledku v původním jazyce

Concrete slurry waste (CSW) is generated in ready-mix and precast concrete plants after the reclaiming of aggregates from unused concrete. CSW contains hydration residuals (portlandite, calcite, C-S-H and hydrated aluminate phases), as well as fine particles of aggregates. The amount of CSW produced in a ready-mix plant is about 0.8% of produced concrete, thus it is huge amount of material to be treated. Several recycling strategies of CSW have been proposed; most of them are based on the high content of portlandite and calcite. Nevertheless from the point of view of the ready-mix plant, the preferred way is on site recycling - as a component of produced concrete. The present paper aims to evaluate pos-sible utilization of CSW in the role of Supplementary Cementing Material (SCM). CSW is not a conven-tional reactive additive such as e.g. fly ash, but it is very fine and contains a certain amount of residual clinker minerals and high amount of calcite, which is used successfully as SCM. The CSW under study was collected as a fresh material after aggregates reclaiming, partially dewatered and immediately used as the cement replacement in concrete. The 10% dosing did not cause any decrease of strength; the appli-cability of CSW in a higher amount was limited by its high fineness, which reduced the workability of the mixture. The CSW itself has been distinguished by elevated chromium leaching; the incorporation of CSW in concrete caused Cr immobilization. The performed experiments demonstrated that the on-site recy-cling of the fresh CSW as a concrete component is feasible.

Název v anglickém jazyce

Recycling of fresh concrete slurry waste as supplementary cementing material: Characterization, application and leaching of selected elements

Popis výsledku anglicky

Concrete slurry waste (CSW) is generated in ready-mix and precast concrete plants after the reclaiming of aggregates from unused concrete. CSW contains hydration residuals (portlandite, calcite, C-S-H and hydrated aluminate phases), as well as fine particles of aggregates. The amount of CSW produced in a ready-mix plant is about 0.8% of produced concrete, thus it is huge amount of material to be treated. Several recycling strategies of CSW have been proposed; most of them are based on the high content of portlandite and calcite. Nevertheless from the point of view of the ready-mix plant, the preferred way is on site recycling - as a component of produced concrete. The present paper aims to evaluate pos-sible utilization of CSW in the role of Supplementary Cementing Material (SCM). CSW is not a conven-tional reactive additive such as e.g. fly ash, but it is very fine and contains a certain amount of residual clinker minerals and high amount of calcite, which is used successfully as SCM. The CSW under study was collected as a fresh material after aggregates reclaiming, partially dewatered and immediately used as the cement replacement in concrete. The 10% dosing did not cause any decrease of strength; the appli-cability of CSW in a higher amount was limited by its high fineness, which reduced the workability of the mixture. The CSW itself has been distinguished by elevated chromium leaching; the incorporation of CSW in concrete caused Cr immobilization. The performed experiments demonstrated that the on-site recy-cling of the fresh CSW as a concrete component is feasible.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

<a href="/cs/project/GA19-11027S" target="_blank" >GA19-11027S: Betonárenský kal - nebezpečný odpad nebo druhotná surovina?</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Construction and Building Materials

ISSN

0950-0618

e-ISSN

1879-0526

Svazek periodika

300

Číslo periodika v rámci svazku

124061

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

10

Strana od-do

—

Kód UT WoS článku

000687382800011

EID výsledku v databázi Scopus

2-s2.0-85108779084