渠道保温材料保温性能演化规律的试验研究

渠道冻害是寒区水利建设中的常见问题,采用衬砌保温措施是目前常见的防治方法,本文选择了6种常见的发泡保温材料,其中包括4种硬质发泡材料(不可卷曲)和2种软质发泡材料(可卷曲),研究了它们在应力、浸水及冻融情况下保温效果的变化规律。试验发现,软质材料在保温稳定性方面有一定优势,但力学性能无法满足工程需要。硬质材料中EVA保温板、XPS保温板和EPS保温板具有非常接近的长期保温效果,而在力学性能方面XPS和EPS更有优势。影响EPS和XPS保温板长期保温性能的首要因素是冻融问题,所以改善聚苯乙烯保温板抗冻融性能具有重要的现实意义。

The evolutionary process of thermal insulation properties of material used on channel

The frozen damage in channel is regarded as the common problems in water project construc-tion,and the insulation measures is the common control methods at present. 6 kinds of foam insulation ma-terials, including 4 kinds of hard material and 2 kinds of flexible material, are studied in this paper un-der the condition of stress,immersion and freezing thawing. It shows that the mechanical properties of flexi-ble materials cannot meet the needs of engineering, although it has certain advantages in terms of long-term thermal insulation stability. The hard insulation boards, made of EVA, XPS and EPS, have a very similar long-term thermal insulation effect. In mechanical properties, the XPS and EPS boards have more advantages. The main factors that affect the long-term thermal insulation properties of EPS and XPS boards are freezing and thawing, so it has a realistic and important significance to improve the freeze-thaw resistance of polystyrene insulation board.