California bearing ratio, Civil Engineering

California Bearing Ratio (CBR):

The most widely used test for determining the supporting power of a soil for designing the thickness of pavements is the California Bearing Ratio (CBR) test. The test is a penetration test in which a soil sample compacted to the specified density and soaked under water for 4 days in a mould is subjected to penetration by a plunger at a standard rate. The CBR value is expressed as a percentage of the actual load causing penetrations of 2.5 mm or 5 mm to the load required for a standard crushed stone sample.

Some typical values of the CBR of different types of soil are given below:

Table: CBR Values of Typical Soils

755_California Bearing Ratio.png

The use of CBR values in pavement design is discussed further.

Posted Date: 1/22/2013 2:51:23 AM | Location : United States







Related Discussions:- California bearing ratio, Assignment Help, Ask Question on California bearing ratio, Get Answer, Expert's Help, California bearing ratio Discussions

Write discussion on California bearing ratio
Your posts are moderated
Related Questions
what is material of wmm plant

Explain the Interim inspection - underwater inspection of bridge An interim inspection is an inspection scheduled at the discretion of the engineer. An interim inspection is us

Landslides induced by rainfall After rainfall, groundwater pressure is built up and this elevates ground water table. Water inside the pores of soil reducesthe effective stres

Question Soil nails are mostly designed for stabilization of key slips . How can designer cater for stability of minor slips? Answer There are many methods to treat mi

Explain Hardness - Water Softening 1) Hardness is used to characterize a water that does not lather well, causes a scum in the bath tub and leaves hard, white, crusty deposits

Grade of Cement: In India, the following grades of cement are used for roads : Ordinary Portland Cement (OPC) Grade 33 Grade 43 Grade 53 Portland Pozz

The Passage of time is single reason. Buildings also collapse because of weak foundations. Earthquakes, hurricanes and other natural disasters can also damage the structure of the

Q. One-way pre stressing vs two-way pre stressing? At the time of pre-stressing operation at one end, frictional losses will take place and the prestressing force decreases alo

A clay layer 24 metres thick has a saturated unit weight of 18 kN/m 3 . Ground water level occurs at a depth of 4 metres. It is proposed to construct a reinforced concrete foundati

What is the difference between routing maintenance and major maintenance in school facilities? Ans) The routine maintenance is the minor and consistent repairs that are engaged