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Fines extracted from recycled concrete as alternative raw material for Portland clinker production
The use of recycled aggregates in concrete has an important impact on the final quality. They have their influence on the durability and strength development of the final concrete [1]. To upgrade recycled concrete aggregates, the attached mortar on the aggregates has to be cleaned away as much as possible which will generate low grade recycled sand. Valorising this low grade sand is crucial for the success of upgrading recycled concrete aggregates. To increase the quality of recycled sands, the fines (<63 μm) contents [wt%] have to be lowered to attain acceptable water demands to optimise their use in high end concrete. Within this study, different technical set-ups were used to remove the mortar fraction from the aggregates, and to separate the generated fines from the recycled sand. The relationship between the different separation techniques and the physical and chemical properties of the generated fines was studied to evaluate their fitness as Alternative Raw Material (ARM) for Portland clinker production. Furthermore numerical simulations were carried out to maximise the fines fractions as ARMs in Portland clinker meals based on which experimental clinkers were produced. The final clinkers were fully analysed and evaluated on possible mineralogical influences.
Fines extracted from recycled concrete as alternative raw material for Portland clinker production
The use of recycled aggregates in concrete has an important impact on the final quality. They have their influence on the durability and strength development of the final concrete [1]. To upgrade recycled concrete aggregates, the attached mortar on the aggregates has to be cleaned away as much as possible which will generate low grade recycled sand. Valorising this low grade sand is crucial for the success of upgrading recycled concrete aggregates. To increase the quality of recycled sands, the fines (<63 μm) contents [wt%] have to be lowered to attain acceptable water demands to optimise their use in high end concrete. Within this study, different technical set-ups were used to remove the mortar fraction from the aggregates, and to separate the generated fines from the recycled sand. The relationship between the different separation techniques and the physical and chemical properties of the generated fines was studied to evaluate their fitness as Alternative Raw Material (ARM) for Portland clinker production. Furthermore numerical simulations were carried out to maximise the fines fractions as ARMs in Portland clinker meals based on which experimental clinkers were produced. The final clinkers were fully analysed and evaluated on possible mineralogical influences.
Fines extracted from recycled concrete as alternative raw material for Portland clinker production
Schoon, Joris (author) / De Buysser, Klaartje (author) / Van Driessche, Isabel (author) / De Belie, Nele (author) / Justnes, Harald
2014-01-01
1st Concrete Innovation conference, Proceedings
Conference paper
Electronic Resource
English
DDC:
690
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