| 摘要 |
<p>The process for making a road surfacing material with improved resistance to wear and loads, consists of homogenising in a heated mixer, a mixt. of crushed natural stone of 2-32 mm size, quarry or river sand, ground sand of 0.009-2 mm size, stone flour of 0-0.09 mm size, concrete, coal tar, or a mixt. of both as agglomerant, and synthetic silica of ppted. or pyrogenic type.</p> |
