| 摘要 |
<p>A particulate material, suitable for use in the construction of road and airfield surfaces, comprises aggregate particles coated with a set mixture of cement and water, wherein the particles may comprise crushed or uncrushed aggregate, recycled aggregate or artificial aggregate. The coated particles are rougher than the uncoated aggregates. Preferably, natural uncrushed aggregate, e.g. gravels which are smooth and rounded, are coated. Extra lime can be added to the cement, as can microsilicas, setting and/or hardening accelerators, and/or superplasticizers. Additional smaller particulate matter can be included in the coating, some particles of which project from the surface of the coating. The particulate material is made by mixing the aggregate particles with cement, water and any additives, separating the particles by passing over or through vibrating/rotating sieves before the cement sets, and then conveying the separated particles on vibrating conveyor(s) until the cement substantially reaches its initial setting.</p> |
