本规范涵盖砂土混合物的质量和级配；砾石、石头或矿渣筛；或砂、破碎机运行的粗骨料，由砾石、碎石或矿渣组成，含或不含土壤砂浆或这些材料的任何组合，用于底基层、基层和面层的施工。这些要求仅适用于具有正常或平均比重、吸收和级配特征的材料。如果要使用其他材料，必须规定适合其使用的适当限制。

This specification covers the quality and grading of sand-clay mixtures; gravel, stone, or slag screenings; or sand, crusher run coarse aggregate consisting of gravel, crushed stone, or slag with or without soil mortar or any combination of these materials for use in the construction of subbase, base and surface courses. The requirements are intended to cover only materials having normal or average specific gravity, absorption, and gradation characteristics. Where other materials are to be used, appropriate limits suitable to their use must be specified.