Synthetic Aggregates of High Resistance to Polishing. Part 3-Porous Aggregates,

摘要

The report describes research carried out on a group of roadstones which owe their high polish-resistance to their vesicular or porous nature. Freshly broken materials of this type have a rough micro-texture which is largely retained through progressive exposure of sections of pores as wear takes place. Although it improves resistance to polishing,the introduction of pores into a material tends to reduce its strength and resistance to abrasion. The extent of this reduction has to be carefully balanced against the gain in resistance to polishing if a successful material is to be developed. The report describes a study of the effect of different degrees of porosity on the properties of a number of different materials and relates the results to the optimum performance of synthetic polish-resistant aggregates.