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.

釉面空心珠（GHB）是一种创新材料，当用作普通细骨料的部分替代品时，可赋予混凝土非常好的隔热性能并提高混凝土的抗冻性。在混合物中加入GHB后，冻融循环下的抗冻性的改善以及再生骨料绝热混凝土（RATIC）的劣化机理是本研究的目标。由五个RATIC混合物制成的15个立方体和90个棱镜（GHB含量= 0、40、65、90和130 kg / m ³）经过压缩测试，以确定GHB的最佳含量。根据质量损失，动弹性模量和单轴抗压强度，确定了RATIC的降解机理。此外，通过计算机断层扫描技术研究了RACIC的介观结构，并通过分析孔的数量，平均和最大孔面积以及孔隙率来研究其劣化机理。实验结果表明，向再生骨料混凝土（RAC）中添加釉面空心珠会适度改变混凝土的介观结构，从而具有抗冻性的优势，GHB的最佳含量约为90 kg / m ³。