| 摘要 |
<p>A resilient paving block is formed form a mixture of aggregate and a foamed bitumen binder. The foamed bitumen if formed by spraying hot bitumen 14 into an expansion chamber 1 into which cold water 16 and compressed air are also sprayed. The foamed material is then mixed with aggregate, pressed and cured. At around 60 {C for about 72 hours. In a preferred embodiment, the aggregate comprises recycled asphalt planings. An additive to accelerate structural stiffness gain may be added, ideally this is a pozzolanic binder chosen from Portland cement, pulverised fuel ash or quicklime. Colouring agents may also be added.</p> |
