This paper presents the mechanical property of wet-mix and dry-mix mortars prepared with different contents and size gradings of glass aggregates after exposure to an elevated temperature of 800°C. The tests were performed during 800°C exposure (hot test) and after cooling from 800°C to room temperature (cold test). In the cold test, the residual compressive strength of both the wet-mix and the dry-mix mortars increased with increasing content and decreasing particle size of glass aggregates. However, for the hot test, when the replacement of river sand by the glass aggregates was above 15%, the residual compressive strength sharply decreased. This was attributed to the glass aggregates were softened and the semi-melted glass acted like “soft” aggregates which were unable to sustain stress (loading) under the hot test. Unlike the improvement mechanism through better bonding between the re-solidifying glass aggregates and the cement matrix after cooling, the optimal performance of the mortars prepared with 15% of glass aggregates to replace river sand in the hot test was attributed to the penetration of the softened glass into the empty pores during loading. Further reducing the percentage of glass aggregates led to decrease in strength due to the excessive thermal expansion of river sand in the mortars. Compared with the cold test, the impact of glass particle size was less obvious on the residual strength for the hot test. Due to their higher porosity, the dry-mix mortars performed better than the wet-mix mortars under both the hot and cold test conditions.

本文介绍了湿混和干混砂浆的机械性能，这些砂浆在暴露于800°C的高温后具有不同含量和尺寸等级的玻璃骨料。在暴露于800°C（热测试）期间和从800°C冷却至室温（冷测试）之后进行测试。在冷试验中，湿混砂浆和干混砂浆的残余抗压强度均随玻璃骨料含量的增加和粒径的减小而增加。但是，对于热试验，当玻璃骨料代替河砂的含量超过15％时，残余抗压强度会急剧下降。这归因于玻璃聚集体被软化，半熔融玻璃的表现像“软”聚集体，在热测试下无法承受应力（载荷）。与通过冷却后重新固化的玻璃骨料与水泥基体之间更好的粘结所产生的改进机制不同，用15％的玻璃骨料制备的砂浆在热试验中替代河砂的最佳性能归因于软化剂的渗透。在装填期间将玻璃倒入空的毛孔中。由于砂浆中河砂的过度热膨胀，进一步降低了玻璃骨料的百分比，导致强度降低。与冷测试相比，玻璃粒度对热测试的残余强度的影响不太明显。由于其较高的孔隙率，干混砂浆在热和冷测试条件下的性能均优于湿混砂浆。