渠道保温材料保温性能演化规律的试验研究

摘要

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 frozen damage in channel is regarded as the common problems in water project construction,and the insulation measures is the common control methods at present.6 kinds of foam insulation materials,including 4 kinds of hard material and 2 kinds of flexible material,are studied in this paper under the condition of stress,immersion and freezing thawing.It shows that the mechanical properties of flexible 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.