According to the national industry standard (JTJ058-2000) (T0334-1994) in the fine aggregate and sand equivalent test instruction design products, suitable for asphalt and cement concrete, with natural sand, artificial sand and stone chips, the largest aggregate diameter less than 4.75 mm, the determination of fine aggregate in the cohesive soil or the content of impurities, to assess the cleanliness of aggregate, sand equivalent with SE said.