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Title: Acoustic and Thermal Analyses of Self-Consolidating Lightweight Rubberized Concretes

Author(s): A. F. Angelin, E. J. P. de Miranda Junior, J. M. C. dos Santos, W. R. Osório, R. C. Cecche Lintz, and L. A. Gachet

Publication: Materials Journal

Volume: 119

Issue: 6

Appears on pages(s): 53-64

Keywords: acoustic attenuation; lightweight concrete; mechanical resistances; self-consolidating concrete (SCC); thermal conductivity; waste tire rubber

DOI: 10.14359/51736005

Date: 11/1/2022

Self-consolidating concretes (SCCs) have been widely studied in recent years. However, investigations concerning self-consolidating lightweight rubberized concrete (SCLRC) are scarce. This paper focuses on both the expanded clay and waste tire rubber contents. Both the fresh and hardened properties are evaluated. Additionally, the thermal and acoustic properties are also analyzed. Because the expanded clay has a rounded shape without edges or tips, presenting a smooth and glassy surface, it improves the workability and spreading of the concrete. Also, the mechanical behavior, together with the lightweight effect and associated with thermal conductivity, is a remarkable property attained. The rubber acts negatively on the properties in the fresh state of SCLRC. The compressive strength of SCLRC is lower than that of conventional SCC. It is found that with the use of light aggregates, which are replaced with conventional aggregates, an increase of approximately 50% in the acoustic attenuation and a decrease of 70% in the thermal conductivity are attained. This induces better thermal and acoustic insulation than the conventional concrete associated with being environmentally friendly.