WHAT IS CBR (CALIFORNIA BEARING RATIO) TEST?


This is a test to measure the penetration strength of ground, subgrades and base courses during new roads constructions. It was developed by California Department of Transportation to make sure roads are constructed on perfect areas of the earth. The first step is to measure the pressure needed to penetrate soil or surface in a bid to avoid unnecessary destruction of land.  ASTM Standards D1883-05, D4429 and AASHTO T193 are the standards used in describing perfect CBR outcomes on soils and rocks.
Importance of CBR Test

You have found roads degrading in quality and cracking easily after some time of usage. That is simply due to the weight being exerted on that particular road by the vehicles passing on it. CBR is used to measure the load bearing capacity of soils in a bid to construct roads that will be durable and safe for the purposed carriage means. It can even measure load bearing capacity of airstrips to make sure only the appropriate places can land in those areas without causing any damage. The higher the CBR, the tougher the road and this means it can support heavy loads and materials without breaking or cracking.

There is a formula used to determine CBR and the common or toughest stone is limestone that has a CBR rating of 100. This means all materials are rated based on this stone and you can be sure to achieve excellent measurements if you use the formula perfectly.

The CBR rating is a perfect measure of land toughness and this means only roads that are of perfect quality can be constructed. Even safety is improved because engineers are able to construct only the best roads that are in line with the carriage requirements. Roads destructions are immensely reduced since people now know what kind of a road is used for what purpose. Testing is done in lab, onsite or by use of equipment that reveals load bearing capacities of surfaces and rocks. Once it is done, construction can then start and the road or carriage way will be up to the task because it will be robust enough to support what is intended to support.

Comments

Post a Comment

Popular posts from this blog

Advantages of Universal Testing Machine

The main advantage of investing in a universal testing machine is that the device can be used to test the strength, durability, and suitability for most any material. A universal testing machine has the capability to pull, compress, bend, or stretch material to its breaking point. It is primarily used by laboratories that manufacture and or mould different types of plastics. A universal testing device features one or two vertical columns mounted on a base. A second horizontal plate contains attachments that are used to hold the sample and slides up and down during stress testing samples. Dual vertical column machines are preferred by most laboratories as they can handle larger samples in terms of size and weight. Determining tensile strength is the most common test performed in a universal testing machine. This is done by holding one end of a sample in place while the other is pulled away until two sides are torn apart. The same process is used for testing flexural str
Read more

Uses for Universal Testing Machine

Universal testing machine or UTM is aptly named as it can perform various types of tensile and compression tests on different materials. There are also many different terms used to refer to a UTM that you will commonly hear in the industry, among the most popular of which are a tensile tester, bend tester, and compression tester. Some types of UTMs are stripped of some capabilities and/or are marketed to specific sectors, like texture analyzers for food, peel tester for adhesives, labels, and tapes, and top load compression tester for pipes and packaging. True UTMs can perform all of these and more. They are great multi-purpose instruments for any QC or R&D laboratory. The following are only a few common uses for UTMs: Tensile testing – One of the most common applications for UTM, a tensile test measure how strong a material is, how long it can stretch, and how stiff it is as the material is pulled apart until breaking point. Compression testing – Compr
Read more

Precautions to Be Taken While Using a Piezometer

The piezometer is a measuring device that determines pore pressures underground and liquid pressure. By determining pore pressure, you can understand the behaviour of the ground before, during, and after a construction project. Certain precautions must be taken when using a piezometer to ensure proper usage and the accuracy of results. Here are some of them: Have the right equipment – Invest in a state-of-the-art piezometer that uses a proven method of converting fluid pressures on the sensitive diaphragm into frequency signals which are ideal in the demanding environment common with civil engineering applications. Modern piezometers are capable of long distance signal transmission without degradation. They can tolerate wet wiring conditions and resist external electrical noise, too. Some manufacturers make piezometers specific for different applications, for instance, you should be able to find one with a heavy-duty body that can be b
Read more