This paper presents an investigation on high temperature performance of dry-mix and wet-mix concretes using 0–100% glass aggregates to replace river sand. The thermal conductivity at room temperature and the compressive strength before and after exposure to elevated temperatures were evaluated. The dry-mix and wet-mix concretes with the content of 100% glass aggregates were examined by X-ray μCT, microhardness and SEM-BSE to explain the noticeable property improvement after exposure to 800 °C. Regardless of the casting method, the increasing content of glass aggregates reduced the thermal conductivity at room temperature and improved the compressive strength after exposure to 800 °C. This was because the surface of the glass aggregates was partially melted at 800 °C and it re-solidified after cooling, which served to enhance the bond between the glass aggregates and the cement paste. The new bonding played a role in filling up the gap between the glass aggregates and the cement paste and partially repaired the decomposition of cementitious materials after exposure to 800 °C. With a constant content of glass aggregates, the dry-mix concrete had a lower thermal conductivity at room temperature and a higher residual compressive strength after exposure to 800 °C than the wet-mix concrete. This was due to the higher initial porosity of the dry-mix concrete and the glass aggregates which were not completely attached to the cement paste, both of which would contribute to reliving the thermally induced expansion.

本文对使用0–100％玻璃骨料代替河砂的干混和湿混混凝土的高温性能进行了研究。评价了室温下的热导率和暴露于高温之前和之后的抗压强度。通过X射线μCT，显微硬度和SEM-BSE检查了含量为100％玻璃骨料的干混和湿混混凝土，以说明暴露于800°C后性能显着改善。无论采用哪种铸造方法，增加玻璃骨料的含量都会降低室温下的导热性，并提高暴露于800°C后的抗压强度。这是因为玻璃聚集体的表面在800°C时部分熔化，冷却后又重新凝固，用来增强玻璃骨料和水泥浆之间的粘结力。新的粘结作用可以填补玻璃骨料和水泥浆之间的间隙，并在暴露于800°C后部分修复了胶结材料的分解。在玻璃骨料含量恒定的情况下，干混混凝土在室温下的热导率较低，在暴露于800°C后比湿混混凝土具有更高的残余抗压强度。这是由于干混混凝土和未完全附着在水泥浆上的玻璃骨料的较高初始孔隙度，这两者都将有助于消除热致膨胀。新的粘结作用可以填补玻璃骨料和水泥浆之间的间隙，并在暴露于800°C后部分修复了胶结材料的分解。在玻璃骨料含量恒定的情况下，干混混凝土在室温下的热导率较低，在暴露于800°C后比湿混混凝土具有更高的残余抗压强度。这是由于干混混凝土和未完全附着在水泥浆上的玻璃骨料的较高初始孔隙度，这两者都将有助于消除热致膨胀。新的粘结作用可以填补玻璃骨料和水泥浆之间的间隙，并在暴露于800°C后部分修复了胶结材料的分解。在玻璃骨料含量恒定的情况下，干混混凝土在室温下的热导率较低，在暴露于800°C后比湿混混凝土具有更高的残余抗压强度。这是由于干混混凝土和未完全附着在水泥浆上的玻璃骨料的较高初始孔隙度，这两者都将有助于消除热致膨胀。与湿混混凝土相比，干混混凝土在室温下的导热系数较低，在暴露于800°C后具有较高的残余抗压强度。这是由于干混混凝土和未完全附着在水泥浆上的玻璃骨料的较高初始孔隙度，这两者都将有助于消除热致膨胀。与湿混混凝土相比，干混混凝土在室温下的导热系数较低，在暴露于800°C后具有较高的残余抗压强度。这是由于干混混凝土和未完全附着在水泥浆上的玻璃骨料的较高初始孔隙度，这两者都将有助于消除热致膨胀。