Title:
Efficiency of Using Recycled Coarse Aggregate for Internal Curing of Blended Cement Concretes
Author(s):
Troian Viacheslav, Gots Volodymyr, Bruno Alex, Panek Rafał, and Flatt Robert J.
Publication:
Symposium Paper
Volume:
362
Issue:
Appears on pages(s):
916-929
Keywords:
internal curing, recycled aggregate concrete, rheology, workability
DOI:
10.14359/51742018
Date:
6/18/2024
Abstract:
It is known that the use of recycled coarse aggregates (RCA) can raise a variety of problems, which are mainly due to the porosity of the old mortar contained in RCA. One of the simpler ways to solve these problems is the pre-wetting of RCA, which allows not only to minimize disadvantages but also to obtain the advantages associated with the effect of internal curing. Undoubtedly, the strongest positive effect of pre-wetted RCA is on the rheology of recycled concrete. But there are also possible positive effects of internal curing for strength and durability of blended cement concretes, which require longer curing times compared to normal Portland cement concrete. In this paper, we mostly study the influence of porous RCA on the rheology of cement paste, based on slag cement with a 75% slag content. For this purpose, the absorption properties of RCA of different sizes were studied. From this, mathematical dependences of the workability of cement systems on w/c and time could be obtained. These further underline the positive effect of pre-wetting of RCA with regard to retaining the workability of cementitious systems. This lays the basis for a broader study of pre-wetting RCA on the rheology of mixtures, strength, and durability to be covered in future publications.
Related References:
1. Troian, V.; Gots, V. ; Keita , E.; Roussel, N.; Angst, U.; Flatt, R. J. Challenges in Material Recycling for Postwar Reconstruction. RILEM Tech Lett 2022, 7, 139-149. doi: 10.21809/rilemtechlett.2022.171
2. Improving the properties of recycled concrete aggregates by accelerated carbonation Zengfeng Zhao, Sébastien Remond, Denis Damidot, Luc Courard, and Frédéric Michel Proceedings of the Institution of Civil Engineers - Construction Materials 2018 171:3, 126-132. doi: 10.1680/jcoma.17.00015
3. Jean Michel Torrenti, Ouali Amiri, Laury Barnes-Davin, Frédéric Bougrain, Sandrine Braymand, Bogdan Cazacliu, Johan Colin, Amaury Cudeville, Patrick Dangla, Assia Djerbi, Mathilde Doutreleau, Adelaïde Feraille, Marielle Gueguen, Xavier Guillot, Yunlu Hou, Laurent Izoret, Yvan-Pierre Jacob, Jena Jeong, Jean David Lau Hiu Hoong, Pierre-Yves Mahieux, Jonathan Mai-Nhu, Heriberto Martinez, Vincent Meyer, Vincent Morin, Thomas Pernin, Jean-Marc Potier, Laurent Poulizac, Patrick Rougeau, Myriam Saadé, Lucie Schmitt, Thierry Sedran, Marie Sereng, Anthony Soive, Glaydson Symoes Dos Reys, Philippe Turcry, The FastCarb project: Taking advantage of the accelerated carbonation of recycled concrete aggregates, Case Studies in Construction Materials, Volume 17, 2022, e01349, ISSN 2214-5095, doi: 10.1016/j.cscm.2022.e01349
4. Yildirim, S.T.; Meyer, C.; Herfellner, S. Effects of internal curing on the strength, drying shrinkage and freeze–thaw resistance of concrete containing recycled concrete aggregates. Constr. Build. Mater. 2015, 91, 288–296. doi: 10.1016/j.conbuildmat.2015.05.045
5. El-Hawary, M.; Al-Sulily, A. Internal curing of recycled aggregates concrete. J. Clean. Prod. 2020, 275, 122911. doi: 10.1016/j.jclepro.2020.122911
6. Dale P. Bentz, Internal Curing of High-Performance Blended Cement Mortars. (2007). ACI Materials Journal, 104(4), pp. 408-414. doi: 10.14359/18831
7. Stark, J.,Wicht B. Dauerhaftigkeit von Beton. Der Baustoff als Werkstoff. Baupraxis Birkhauser, Berlin, 2001. ISBN 978-3-7643-6344-4
8. DSTU B V.2.7-170:2008 Concretes. Methods of determining the average density, humidity, water absorption, porosity and waterproof
9. Pierre, A., Lanos, C., & Estelle, P. (2013). Extension of spread-slump formulae for yield stress evaluation. Applied Rheology, 23(6), 63849. doi: 10.3933/ApplRheol-23-63849
10. Shengnan Sha, Sara Mantellato, Stefanie Anne Weckwerth, Zhidong Zhang, Caijun Shi, Robert J. Flatt. Do superplasticizers work the way we think? New insights from their effect on the percolation threshold of limestone pastes. Cement and Concrete Research, Volume 172, 2023, 107235
doi: 10.1016/j.cemconres.2023.107235
11.Delphine Marchon, Federica Boscaro, Robert J. Flatt. First steps to the molecular structure optimization of polycarboxylate ether superplasticizers: Mastering fluidity and retardation, Cement and Concrete Research, Volume 115, 2019, Pages 116-123, doi: 10.1016/j.cemconres.2018.10.009