web design templates

Welcome to CBR Testing and Plate Testing Services
Get in touch

Mobirise

What Is CBR Testing and When Should You Use It?

The California bearing ratio measures the associating subgrade value. It aims at evaluating the ground and its substrates strengths. The CBR testing was an initiative by the California Department of Transport. The testing has found use in road construction as well as in the development of airstrips and pavements. The concept of the CBR has spread and become applicable in many parts of the world. It gives its measurements inform of rates and can be expressed as a ratio or percentage. If you are looking for cbr testing in the UK try https://www.cbrtesting.com who will be able to give you a quote on cbr or plate testing services.

Usually, the bearing ratio for hard surfaces is higher than that of soft areas. The softness or hardness determines the amount of weight that can pass on the surface without any effect. For the roads scenario, bearing ratio means that the soil below the proposed road, which is also referred to as the subgrade, has to be tested for things such as its density. What is CBR testing?

Mobirise

When to Use the CBR Testing

The CBR test is used in building roads and airstrips as well as other constructive pathways. The need to have correct load bearing amounts necessitates the CBR. Before this construction, CBR results are used to determine factors like the material thickness to be used so that when the newly constructed roads are ready for use, any load can be passed by the heavy vehicles with their cargos.  

The road usage has to be left intact despite use. CBR testing, therefore, results in the development of high-quality roads that are predetermined in a load balancing aspect. The pressure exerted is determined by the force of the object and the area it’s exerted. Normally, the vehicles have a small area on the wheels that uses all its pressure on the road. Pressure is simply the ratio of force exerted on the area the object has.

Mobirise

Overview of CBR Testing Procedure

The CBR test is used in building roads and airstrips as well as other constructive pathways. The need to have correct load bearing amounts necessitates the CBR. Before this construction, CBR results are used to determine factors like the material thickness to be used so that when the newly constructed roads are ready for use, any load can be passed by the heavy vehicles with their cargos.  

The road usage has to be left intact despite use. CBR testing, therefore, results in the development of high-quality roads that are predetermined in a load balancing aspect. The pressure exerted is determined by the force of the object and the area it’s exerted. Normally, the vehicles have a small area on the wheels that uses all its pressure on the road. Pressure is simply the ratio of force exerted on the area the object has.

Working on the Ground
CBR testing on the ground involves slight ground levelling in preparation for the test. The 1935 mm2 cylindrical plunger is used and exerted to the intended ground at a specified rate. The process involves the use of a 4wd vehicle to source the reaction load needed to drive the CBR press as well as moving the CBR testing machinery.

Records are taken at regular intervals of time for the plunger penetration. Six to eight tests can be conducted in a day by each machine. The recorded measurement results are plotted on a graph. The slope of the graph has to be determined to obtain the CBR ratio.

The Test can still be done using portable machinery. Some companies also apply the use of Dynamic Cone Penetrometer in CBR testing. In general, these tests are aimed to test the ground fitness in the development of a road.

The CBR tests are also done to determine factors such as CBR value of the soil, Value of base course, the value of sub-base course, the thickness of road to be constructed and the maximum load that can use the particular highway on development.

Importance of the CBR Tests
CBR tests result in the building of quality, durable and safe roads and other pavements. There are many other reasons behind the use of CBR testing, which includes the following:

- CBR testing requires basic skills that can be learnt easily and start operation. The equipment used is easy to operate and make records from resulting values.
- The tests have two options the use of heavier equipment and the portable one. The choice of using portable equipment makes the test flexible and simplified.
- CBR testing has broad use in its ratio determination. The techniques are applicable even beyond an experiment in subgrades.
- The processes followed in this kind of testing are easy to use. The CBR test does not necessarily need groundwork, but it can still work with sample soils from the targeted ground.

Conclusively, the testing is all about determining the penetration of the load on the ground it lays the pressure. Therefore the goal of CBR tests is to eliminate the penetration possibilities as loads pass over the built roads.

© Copyright 2017 Mobirise - All Rights Reserved