The phrase "a base course" is correct and usable in written English.
It can be used in contexts related to construction, engineering, or culinary terms, referring to a foundational layer or primary component.
Example: "Before laying the asphalt, we need to prepare a base course to ensure stability and durability."
Alternatives: "a foundational layer" or "a primary layer".
Test results show that the compacted RAP-FA blend can be used as a base course material as its UCS values meet the specified strength requirements.
The practical use of geosynthetics above a weak subgrade or within a base course has demonstrated the benefit of reducing rut depths and prolonging pavement life.
Sections were formed with a poor subgrade (A-6) and two structural layers: the first section consisted of a base course and a surface built using a natural aggregate and a low quality mixed recycled aggregate, respectively, and the second section, which was used as a reference, consisted of a soft crushed limestone aggregate.
In this part of the study, two different type of concrete, C30/37 strength class without any glass bead and with glass bead (19 % by weight of total aggregate) were placed on a base course layer (25 cm thick crushed limestone).
The board of investigation found that because of his belief that he was on a base course toward Florida, Taylor actually guided the flight farther northeast and out to sea.
On the first day, a base-course for the foundation of the water cistern is assembled which consists of raw and crude limestones assembled similar to prepacked concrete.
This paper presents a laboratory investigation of recycled clay bricks (RCB) from demolished building when mixed with recycled concrete aggregates (RCA) as an unbound base course in road construction.
In this project, a Swiss standard surface course and a high modulus base course were produced containing 0% or 40% reclaimed asphalt pavement (RAP), short and long term aged and, subsequently, investigated regarding their chemical, microstructural and mechanical properties.
In order to improve accessibility of rural access roads to communities in rural areas of developing countries, a method to reinforce the base course with "do-nou", a Japanese term for soil bag, has been developed.
For instance, carbonation damages the cement-modified crushed rocks as a typical material for base course layer due to poor curing of material or cracking of asphalt.
The addition of RAP had a negative effect on the fatigue performance of the base course and a positive effect on the binder course.
