| 摘要 |
PROBLEM TO BE SOLVED: To obtain a paving material having little wear, little splashing of aggregates and largely improved clogging while keeping water permeability (water draining property) by mixing large aggregates and small aggregates in a resin in a way to satisfy specified conditions. SOLUTION: This paving material is produced by mixing a large aggregate 1 and a small aggregate 2 in a resin, and the apparent volume of the large aggregate 1 possesses almost all the volume, while the apparent volume of the small aggregate 2 fills the space among the large aggregate 1. (The hatched area in the figure represents the space filled with the small aggregate 2). The mixing ratio of the aggregate to the resin is controlled not strictly but only to keep the water permeability, and is usually about 15:1 to 7:3 weight ratio of the aggregate to the resin. The large aggregate contains grains having >=10 mm grain size by >=70%. The small aggregate contains grains having <=1.5 mm grain size by >=70 wt.%. The grain size distribution of the small aggregate shows that grains having 1.5 to 0.4 mm grain size are included by 60 to 90 wt.% and grains having <=0.4 mm grain size are included by 10 to 40 wt.%. |
