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AN OVERVIEW OF SUSTAINABLE CONCRETES WITH MAXIMIZED AGGREGATE CONTENT: NATURAL LIMESTONE VERSUS STEEL-MAKING SLAGS

Egileak:
Verónica García-Cortés, David Garcia, Víctor Revilla-Cuesta, Jesús María Romera, José Tomás San-José
Urtea:
2022
Komunikazioa kongresuan:
REHABEND Construction Pathology, Rehabilitation Technology and Heritage Management
Hasierako orria - Amaierako orria:
1634 - 1642
ISBN/ISSN:
978-84-09-42252-4 (Print) / 978-84-09-42253-1 (Digital)
Deskribapena:

<b>ABSTRACT</b></br>

The conversion of various industrial by-products from Spanish factories into co-products used in

partial substitution of cement and concrete aggregate has been extensively studied since the 1990s.

Building on that research effort, the present investigation is focused on improving the packing

density of concrete aggregates, with special emphasis on two central objectives: firstly, the

reduction of cement and natural aggregate content within concrete; secondly, the validation of their

substitution by Electric Arc Furnace Slag (black-slag) aggregate. To do so, several experimental

campaigns were conducted, in which 4 compaction procedures were applied under dry conditions

to: 4 sieved fractions of natural limestone and 3 sieved fractions of black-slag aggregates. The

physical properties of the 7 sieved fractions had previously been characterized and compared with

theoretical models, in order to validate their dosing in the experimental tests: Fuller curve, Funk

and Dinger curve, Compressible Packing Model, and the 3-Parameter Packing model. The

aggregate-packing densities were experimentally and theoretically studied with dry methods. Our

findings showed that, unlike natural aggregates, other methods based on aggregate shape are

preferable for black-slag mixtures, due to the specific textures and their abrupt particle contours.

The conclusions from the investigations were that both the Compressible Packing Model and the 3-

Parameter Packing models produced valuable packing-density predictions for the binary mixes.

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<b>ACKNOWLEDGEMENTS</b></br>

The authors thanks for funding to MCIN/AEI/10.13039/501100011033/FEDER, UE [PID2021-

124203OB-I00; PID2020-113837RB-I00; RTI2018-097079-BC31; FPU17/03374]. Our thanks also go to <b>SAREN</b> research group (IT1619-22, Basque Government), the Junta de Castilla y León (Regional Government) and ERDF [UIC-231, BU119P17], the BASKRETE initiative and the Transnational Common Laboratory “Aquitaine-Euskadi Network in Green Concrete and Cement-based Materials”. Also thank you to companies: Morteros y Revocos Bikain, HORMOR, FYM Heilderberg Cement Group and Amantegui Group.

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