Soil testing for road construction project needs the site investigation that has to be performed by soil lab experts to know the soil profile. For such works, the soil properties are required at subgrade level. The common soil tests used for road construction are classification of soil, moisture content determination, particle size distribution, specific gravity, plastic limit tests, and liquid limit.
Types of soil tests performed by experts for road construction-
1. In-situ moisture content
The moisture content of soil test is performed by experts in the lab. It is expressed as water percentage in soil to its dry mass. The moisture present in soil reveals several features of soil including permeability, compaction, particle size, etc. This test can be also performed at laboratory.
2. Particle size distribution
This particle size distribution test determines the size of soil particles from the coarse sand size to fine clay size. The data is used to check the suitability of soil for road construction, air field, etc. This test is also run by professionals to predict the movement of soil water.
3. Compaction test
Soil compaction test is also famous with the name of proctor test. It is being used by engineers to determine the dry soil mass per cubic meter when the soil is compacted over a range of moisture level, providing the maximum dry density at optimum moisture content.
What precautions engineers have to take while soil testing for road building?
There are some points to consider while soil testing –
- Sampling and testing – Sampling of soil for tests in lab or in-situ is to be performed by experienced engineer.
- Test data logging – All the logging of soil sample and test data should be done by fully-trained staff that understand the properties of soil and test results.
- Testing frequency – It should be as per input from engineer. Engineer can do testing frequency on the basis of results acquired from the previous testing.
Engineers can perform soil testing in either soil lab or in-situ. If you need more details on soil lab testing, you may kindly contact professionals. To share your feedback for this post, you may comment below. Thank you for your time.