Published: 2023-12-30

Shear modulus and damping ratio of recycled concrete aggregate from cyclic torsional shear test

Katarzyna Gabryś

Abstract

This study examines the small-strain dynamic properties of three mixtures of recycled concrete aggregate (RCA) using laboratory investigations typical of natural soils, namely cyclic torsional shear (CTS) tests. In order to construct two samples, crushed concrete curbs originating from a demolition site in Warsaw was employed. To create the third sample, crushed concrete from demolished buildings also Warsaw was used, mainly from concrete wall and floor elements. A series of CTS tests were performed to investigate the impact of various parameters, including confining pressure, excitation frequency, and number of vibration cycles on the G−modulus, Gmax−modulus, shear modulus degradation curve G(γ)/G<sub>max</sub>, D−ratio, D<sub>min</sub>−ratio, variation in damping curve D(γ)/D<sub>min</sub>. The resulting stiffness and damping characteristics of the analysed concrete aggregate were compared with those of natural gravel and sand aggregate – natural aggregate (NA). The results collected from the CTS tests indicate that the performance of most RCA is comparable to that of NA and can be used as an unbound granular material (UGM).

Keywords:

anthropogenic soil, cyclic loading, damping, stiffness, waste material

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Gabryś, K. (2023). Shear modulus and damping ratio of recycled concrete aggregate from cyclic torsional shear test. Roads and Bridges - Drogi I Mosty, 22(4), 387–398. https://doi.org/10.7409/RABDIM.023.021

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