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一、为什么铺保护层不宜用热沥青?油毡屋面的保护层是卷材屋面的第一道防线。它直接接受阳光的照射、大气的侵蚀、风雨的冲刷,对延长油毡屋面使用年限有很大影响。因此要求,对胶结绿豆砂的胶结材料,应有较高的耐热度和粘结力。耐热度如不足,易流淌;粘结力如不足,易掉粒。此外,在已做好的屋面上走动、操作或维修几乎不可避免,也要求有一定的柔韧度,防止因局部受到外力而产生裂缝。这些性能,用沥青胶结材料比用热纯沥青胶好得多。因此,铺保护层宜用
First, why should the protective layer not use hot asphalt? The protective layer of linoleum roof is the first line of defense of the coiled roof. Its direct exposure to sunlight, atmospheric erosion, and wind and rain erosion have a great influence on extending the service life of linoleum roofs. Therefore, it is required that the cemented material of cemented mung bean sand should have high heat resistance and adhesion. If the heat resistance is insufficient, it is easy to flow; if the adhesion is insufficient, it is easy to lose grain. In addition, walking, operating, or repairing a roof that has already been made is almost inevitable. It also requires a certain amount of flexibility to prevent cracks caused by external forces. These properties are much better with bituminous cementitious materials than with hot pure asphaltic gums. Therefore, the protective layer is suitable for use