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Frost Resistance of Thermoinsulating Recycled-Aggregate Concretes Containing Glazed Hollow Beads

  • Structural Engineering
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Abstract

Glazed hollow bead (GHB) is an innovative material that gives concrete very good thermal-insulation properties and improves concrete frost resistance, when used as a partial replacement of ordinary fine aggregate. The improvement in frost resistance under freeze-thaw cycles and the deterioration mechanisms of recycled aggregate thermoinsulating concretes (RATICs) is the objective of this study, after adding GHBs to the mix. Fifteen cubes and ninety prisms made of five RATIC mixes (GHB content = 0, 40, 65, 90 and 130 kg/m3) were tested in compression, to identify the optimum content of GHB. The degradation mechanisms of RATIC were identified based on mass loss, dynamic elastic modulus and uniaxial compressive strength. In addition, RATIC mesostructure was investigated by means of Computed Tomography Scanning, and the deterioration mechanisms by analyzing pore amount, average and maximum pore area and porosity. The experimental results demonstrate that adding glazed hollow beads to recycled aggregate concrete (RAC) moderately changes the mesostructure of the concrete, to the advantage of frost resistance, and that the optimum content of GHB is around 90 kg/m3.

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Acknowledgments

The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (Grant No. 51678384, 51911530238), the Research Project Supported by Shanxi Scholarship Council of China (Grant No. 2017-038), the Key Program of Natural Science Foundation of Shanxi Province (Grant No. 201803D121108 and 201803D31047) and Natural Science Foundation of Shanxi Province, China (No. 201801D221350) for which the anthors are very grateful. However, the opinions expressed in this paper are solely those of the authors.

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Correspondence to Yuanzhen Liu.

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Wang, Z., Liu, Y., Guo, Y. et al. Frost Resistance of Thermoinsulating Recycled-Aggregate Concretes Containing Glazed Hollow Beads. KSCE J Civ Eng 25, 621–630 (2021). https://doi.org/10.1007/s12205-020-0665-2

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  • DOI: https://doi.org/10.1007/s12205-020-0665-2

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