คอนกรีตและวัสดุก่อสร้าง
เอกสารมาตรฐาน
สหรัฐอเมริกา
AASHTO
M 147-17 (2021)
Materials for Aggregate and Soil–Aggregate Subbase, Base, and Surface Courses
2017 (2021)
3
HM42-2022 part 1
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.