What is the difference between one point and three point CBR?

There are 2 types of CBR tests i.e. 1 point and 3 points CBR tests. The 1 point test is usually done for the alignments. The 3 layers are each given 62 blows using AASHTO T99 (2.5kg rammer). The 3 points test is usually done for lime and cement stabilized samples.

What are the advantages and disadvantages of community based rehabilitation?

Other than the obvious benefit, other pros of community rehabilitation include emotional support, direct access to trained professionals, and financial savings. Cost-cutting hindrances and a possible lack of personalized attention are some potential cons of community rehabilitation centers.

Which soil would you prefer for road construction the soil of CBR 15 or 1?

A clayey soil generally has a low CBR value (less than 8). Sands are more granular and drain better and will generally have CBR values between 15 and 35. Gravel will have the best CBR values, generally 25 and up.

What is bearing ratio test (CBR)?

California bearing ratio test (CBR) is defined as the ratio force per unit area which is required to penetrate a mass of soil with the standard circular piston at a rate of 1.25 millimeters per minute to that required for corresponding penetration of standard material.

What is the CBR test in California?

CALIFORNIA BEARING RATIO TEST 1.Objective CBR is the ratio expressed in percentage of force per unit area required to penetrate a soil mass with a standard circular plunger of 50 mm diameter at the rate of 1.25 mm/min to that required for corresponding penetration in a standard material.

What are the typical CBR values?

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 CBR penetration test?

The laboratory CBR apparatus having of mould 150 millimeters internal diameter with base plate and a collar A loading frame with a cylindrical plunger of 50 millimeters diameter. Briefly, the penetration test consists of causing a cylindrical plunger of 50 millimeters diameter to penetrate a pavement component material at 1.25 mm per minute.