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In situ performance evaluation of spray polyurethane foam in the exterior insulation basement system (EIBS)

机译：外墙外保温地下室系统（EIBS）中喷涂聚氨酯泡沫的现场性能评估

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In 1995, a joint research project with the Institute for Research in Construction was initiated to assess the in situ thermal performance of a number of insulation products used as exterior basement insulation in contact with the ground. Sixteen insulation specimens measuring 610 mm and 1220 mm wide were installed on the exterior basement walls of an experimental building, test hut no. 1, located on NRC campus in Ottawa. These specimens were instrumented prior to backfilling and their thermal performance was monitored over two full years. Soil temperatures and moisture content were monitored concurrently. Weather events were recorded daily. This paper focuses on the performance of the two spray polyurethane foam (SPF) specimens assessed in this experiment. Through analysis of the surface temperatures of the specimens, water movement was detected at the insulation/soil interface through various periods of heavy rain and major thaws throughout the two-year period. Over the same period, the surface of the concrete on the inside of the insulation showed no evidence of water penetration through the SPF layer. The insulation specimens were retrieved after 31 months of exposure in the soil. Good and continuous surface adhesion was also noted on removal. Samples were taken from these exposed specimens. When tested in the lab, after recovery and drying of the specimens, the compressive strengths of the SPF samples were slightly higher than those tested at the beginning of the experiment. For the conditions recorded over two years of monitoring, the thermal performance of each insulation specimen was found to be stable through the heating season. The thermal performance appeared not to be significantly affected by water movement at the exterior face of the insulation. One SPF specimen showed steady thermal performance through two heating seasons while the other actually improved in the second year. It was concluded that the key performance factors of the 76 mm thick SPF specimens sprayed on the exterior surfaces of the concrete basement wall all remained at a very good level, i.e., the in situ thermal resistance, the compressive strength, and the moisture contents of the specimens.
机译：1995年，与建筑研究所进行了一项联合研究项目，以评估用作与地面接触的外部地下室绝缘材料的许多绝缘产品的现场热性能。在实验大楼的地下室外墙上安装了16个610 mm和1220 mm宽的绝缘样品。 1号楼，位于渥太华的NRC校园内。在回填之前对这些样品进行了仪器测试，并在整整两年的时间内对它们的热性能进行了监测。同时监测土壤温度和水分含量。每天记录天气事件。本文着重于在该实验中评估的两个喷涂聚氨酯泡沫（SPF）样品的性能。通过分析样品的表面温度，在整个两年期间，经过大雨和大融化的不同时期，在绝缘/土壤界面处检测到水运动。在同一时期，绝缘体内部的混凝土表面未显示出水渗透通过SPF层的迹象。暴露在土壤中31个月后取回绝缘标本。去除时还注意到良好且连续的表面粘附。从这些暴露的样品中取样。在实验室中测试时，在恢复和干燥样品后，SPF样品的抗压强度略高于实验开始时的抗压强度。对于过去两年的监测记录的条件，发现每个隔热样品的热性能在整个加热季节都稳定。隔热材料外表面的水运动似乎对热性能没有显着影响。一个SPF样品在两个加热季节中显示出稳定的热性能，而另一个在第二年实际上有所改善。结论是，喷洒在混凝土地下室外壁上的76 mm厚SPF试样的关键性能因子都保持在非常好的水平，即原位热阻，抗压强度和含水量。标本。

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