微切削模式下岩石骨料的耐磨性能及影响因素试验研究

Wear resistance of rock aggregate against micro-cutting and its relation to rock properties

分别针对花岗岩、玄武岩、大理岩、灰岩和白云岩5种岩石骨料在微切削模式下的耐磨性能进行了试验研究,分析了影响岩石骨料耐磨性能的内在因素。结果表明:花岗岩的耐磨强度最高,约为耐磨强度最低的白云岩的13倍;玄武岩的耐磨强度次之,约为白云岩的5倍;大理岩、灰岩和白云岩的耐磨强度依次降低。不同岩石的维氏显微硬度相对大小能在一定程度上反映岩石耐磨强度的相对大小,但二者之间并不存在简单的正相关关系;岩石的矿物组成和孔结构是影响其耐磨强度的主要因素;矿物晶粒的尺寸和形貌也会也一定程度上影响岩石的耐磨强度。

Wear resistance of rock aggregate against micro-cutting was tested for five different types of rocks （granite, basalt, marble, limestone and dolomite） and their relations to rock properties were analyzed. Results indicate that granite has the highest resistance that is 13 times that of dolomite, followed by basalt of 5 times, then by marble, limestone and dolomite. The resistance is related to Vickers micro-hardness to a certain extent, but no simple relation between these two parameters has been found in this study. Mineral composition and pore structure of the rocks are major factors of the resistance; size and morphology of the mineral grains also have a certain influence on the resistance.