| 摘要 |
AN IMPACT ABSORBING MACADAM COMPRISES 10 TO 75(PREFERABLY 25 TO 45) OF A PARTICULATE RUBBER HAVING A PARTICLE SIZE OF UP TO 40 MM, 25 TO 90(PREFERABLY 45 TO 65) OF AN AGGREGATE HAVING A PARTICLE OF UP TO 40 MM AND FROM 5 TO 9OF A POLYMER MODIFIED BITUMINOUS BINDER. TYPICALLY SUCH A MACADAM HAS A VOID VOLUME, INTERCONNECTED OR UNCONNECTED, OF FROM 5 TO 25THE POLYMER WHICH MODIFIES THE BITUMINOUS BINDER IS PREFERABLY AN UNBRANCHED STYRENE BLOCK COPOLYMER FORMING ABOUT 7OF THE MODIFIED BINDER. THE MACADAM IS SUITABLE AS A BASE FOR SPORTS PITCHES AND ATHLETIC TRACKS WITHOUT A RUBBER SHOCK PAD OVERLAY. |
