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沥青砂浆是由沥青、石棉和细砂拌合而成的一种混合物，呈黑色胶状，在 ２００℃时有流动 性。这种材料用作下水道接口，比之过去常用的水泥砂奖抹带接口，不透水性较好，和管材粘结 较牢，有弹性，能抗压和抗震，能承受一定挫动和弯曲，不受地下水的侵蚀，而且操作方法简单， 使用设备简单，施工速度很快，成本较低。 施工时，沥青砂奖倒入已涂有沥青冷底子的装有模子的接口处。小口径管道可用木模，大口 径管道采用帆布模。灌入后经３０～６０分钟即可拆模。这种接口方法能满足快速施工的要求，在 一般条件下可以采用。
Bituminous mortar is a mixture of asphalt, asbestos and fine sand mixed in a black colloidal and fluid at 200 ° C. This material is used as a sewer interface, compared with the cement paste used in the past, with wiping zone interface, better water impermeability, and pipe bonding more firmly, flexible, able to withstand pressure and earthquake, can withstand some frustration and bending, Not subject to erosion of groundwater, and the operation is simple, simple equipment, construction speed, low cost. During construction, the tar sand prize is poured into the mold-mounted interface that has been coated with a cold base of asphalt. Small-caliber pipe available wood mold, large-caliber pipe using canvas mold. Poured into the mold after 30 to 60 minutes to demolish. This interface method to meet the requirements of rapid construction, general conditions can be used.