针对聚苯乙烯板受热易分解和耐火性不高的问题，以盐石膏和粉煤灰为基材制作自流平砂浆，在聚苯乙烯板表面涂覆自流平砂浆饰面层，研究饰面层对其热稳定性和耐火性能的影响。结果表明：石膏饰面层在升温过程中可将聚苯乙烯芯材有效地包裹起来，延缓聚苯乙烯芯材板的热分解，涂覆饰面层的聚苯乙烯板的残炭率相比纯聚苯乙烯板增加了 4.3倍，其热释放速率峰值和总热释放量随着饰面层厚度的增加而降低；聚苯乙烯板的升温速率随着饰面层厚度的增加而降低，达到耐火极限的时间随厚度的增加而延长；在整个升温过程中，厚度 2 mm、3 mm和 4 mm饰面层的硬度值
损失率分别为 50.82%、41.98%和 37.52%，表面硬度值损失率随着饰面层厚度增加而降低。
In order to solve the problem of easy to decompose and low fire resistance ofpolystyrene boards，a self-leveling mortar was prepared by using salt gypsum and fly ash andapplied on the substrates，and the effects of the self-leveling mortar finish on the thermal stabilityand fire resistance of the polystyrene board were studied. The results showed that the gypsumfinish layer could wrap the polystyrene core material well during the heating process，delaying the thermal decomposition of the polystyrene board，and the residual carbon of the polystyreneboard coated with the finish layer was increased by 4.3 times compared with the polystyrenesheet alone. The peak heat release rate and total heat release decreased as the thickness of thefinish layer increased；the temperature rising rate of the polystyrene board decreased with theincrease of the thickness of the finish layer，and the time to reach the fire endurance was prolonged with the increase of the thickness；during the whole heating process，the thickness reduction of the finish layer of 2 mm，3 mm and 4 mm were 50.82%，41.98%and 37.52%，respectively . The surface hardness decreased as the thickness of the finish layer increased.
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