AN OVERVIEW OF SUSTAINABLE CONCRETES WITH MAXIMIZED AGGREGATE CONTENT: NATURAL LIMESTONE VERSUS STEEL-MAKING SLAGS
- Authors:
- Verónica García-Cortés, David Garcia, Víctor Revilla-Cuesta, Jesús María Romera, José Tomás San-José
- Year:
- 2022
- Communication in congress:
- REHABEND Construction Pathology, Rehabilitation Technology and Heritage Management
- Initial page - Ending page:
- 1634 - 1642
- ISBN/ISSN:
- 978-84-09-42252-4 (Print) / 978-84-09-42253-1 (Digital)
- Description:
-
<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.
</br>
<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.