| 摘要 |
A process and an appliance for foaming bitumen. Liquid bitumen, at a temperature of 120-160C, is mixed with 1-3% by weight of water in a mixing appliance 8 at a pressure which is greater than the saturation pressure of the steam at the temperature of the hot bitumen. From the mixing appliance, the mixture is allowed to expand via a valve 10, such as a throttle valve, with the desired vaporization of the water in the mixture resulting in the desired foaming of the bitumen. <IMAGE>
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