| 摘要 |
PROBLEM TO BE SOLVED: To restrain scattering of an aggregate, to reduce traveling noise, to enhance safety, and to provide a beautiful appearance of the finish of a surface by using a crushed stone for enhancing uniformity of the grain size and uniformity of a grain shape by selecting the grain size and the grain shape as the aggregate. SOLUTION: A crushed stone on which a vertical difference is within 3 mm in conversion of sieve opening and the ratio of a long diameter to a short diameter is not less than 1.6 is removed, and is selected by using a difference in repulsion when an aggregate 1 strikes on a collision plate 2. In this case, the sieve opening is arranged so as to be vertically dislocated, and the aggregate 1 having the large ratio of a long diameter to a short diameter is selectively left on the sieve opening. The crushed stone for enhancing uniformity of the grain size and a grain shape is used as the aggregate 1 to perform surface treatment of a road surface to repair and refresh a flowing road surface, an abraded road surface and a cracked road surface. The crushed stone is applied to an asphalt road surface, the surface is heated and faired when necessary, and a bitumen material is sprayed on it. Thus, the aggregate 1 is sprayed, rolled and compacted to increase sticking force of the aggregate 1 to restrain scattering of the aggregate 1 to reduce traveling noise.
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