WATER ABSORPTION OF FINE RECYCLED CONCRETE AGGREGATES AS AN INDICATOR OF THEIR QUALITY

Author(s): María E. Sosa, Leandro Carrizo, Yury A. Villagrán Zaccardi, Claudio J. Zega
Paper category: Proceedings
Book title: IV International Conference Progress of Recycling in the Built Environment
Editor(s): Isabel M. Martins, Carina Ulsen, Yury Villagran
ISBN:
e-ISBN: Isabel M. Martins, Carina Ulsen, Yury Villagran
Publisher: RILEM Publications SARL
Publication year: 2018
Pages: 414-421
Total Pages: 08
Language : English

Abstract: Cement paste contained in fine recycled concrete aggregate (FRCA) makes a major difference
in comparison with fine natural aggregates (FNA). For this reason, FRCA generally shows
lower density and higher absorption than FNA. However, inconsistent results for the
relationship between paste content and FRCA properties are found in the literature. Therefore,
the utility of paste content as an indicator of FRCA quality is doubtful. This seems to be the
main reason for inconsistent quantifications of the influence of FRCA properties on mortar
and concrete properties, which are frequently reported in the literature. This paper presents a
comparative analysis of paste content and water absorption (determined by the electrical
conductivity method) as FRCA quality indicators. The consistency of relationships between
both indicators and fresh and hardened properties of mortars is used for this purpose. Results
demonstrate that paste content in weight is not a convenient descriptor of FRCA quality,
while water absorption is better linked with the effect of FRCA on fresh and hardened
properties of mortar.

Online publication : 2018
Publication type : full_text
Public price (Euros) : 0.00