- What are low volume roads?
- What is the maximum aggregate size in CBR method?
- Which frost heave is dangerous?
- What is a good CBR?
- What is the minimum thickness used in bituminous macadam?
- What is the maximum limit of subgrade thickness?
- What is a good CBR value?
- What is the minimum thickness of compacted subgrade for highways?
- What is the thickness of subgrade?
What are low volume roads?
“Everything that sustains us – grown, mined, or drilled – begins its journey to us on a low-volume road (Long).” Defined as roads with traffic volumes of no more than 400 vehicles per day, they have enormous impacts on economies, communication, and social interaction..
What is the maximum aggregate size in CBR method?
20 mmWhat is the maximum aggregate size in CBR method? Explanation: The maximum size of aggregate should be 20 mm in the design of flexible pavement if it is more than 20 mm then above layers are not valid.
Which frost heave is dangerous?
Explanation: The frost heave which is caused in cold temperatures raises the edges of the pavement, if they are uneven then it is very dangerous.
What is a good CBR?
What are the typical CBR values? The harder the material, the higher the CBR value. A CBR value of 2% is usually found for clay, high-quality sub-base will have CBR values between 80% and 100%, and some sands may have values around 10%. The CBR testing can be applied to soils with a maximum particle size of 20 mm.
What is the minimum thickness used in bituminous macadam?
50 mm to 100 mmIt is laid in a single course or in a multiple layers on a previously prepared base. Thickness of the single layer shall be 50 mm to 100 mm. 2.3 Since the bituminous macadam is an open-graded mixture there is a potential that it may trap water or moisture vapour within the pavement system.
What is the maximum limit of subgrade thickness?
What is the maximum limit of sub grade thickness? Explanation: The prepared sub grade is limited to a maximum of 300 mm, in any case it must not exceed 300 mm. Explanation: The base course is laid for a thickness of 100 mm, it may exceed in some cases, in some cases it may be 80 mm and even 40 mm in unimportant roads.
What is a good CBR value?
The harder the surface, the higher the CBR value. Typically, a value of 2% equates to clay, while some sands may have a CBR value of 10%. High quality sub-base will have a value of between 80-100% (maximum). The CBR test is carried out on soils with a maximum particle size of 20mm.
What is the minimum thickness of compacted subgrade for highways?
What is the minimum thickness of compacted sub grade? Explanation: The minimum thickness of sub grade required is 300mm and in highways it is 500 mm as they are provided with the maximum best facilities.
What is the thickness of subgrade?
Generally, adequate density is specified as a relative density for the top 150 mm (6 inches) of subgrade of not less than 95 percent of maximum density determined in the laboratory. In fill areas, subgrade below the top 150 mm (6 inches) is often considered adequate if it is compacted to 90 percent relative density.