Determination of the California Bearing Ratio CBR of an Engineering Lab Report

Determination of the California design Ratio cosmic microwave background radiation of an Engineering Soil sample - Lab Report ExampleThis measure serves as a recommendation for the usage of the engineering soil in subgrades and base courses in pavements. The CBR value is a Rating or percentage which is calculated by comparing the measured pressure with the quantity pressure. Then compared with the recommendation given by different engineering practicing bodies and authorities. The turn out is carried according to BS 1377 let on 4 1990.As the procedure is already discussed in detail in the Laboratory Manual and the BSI Standard. Whereas the drawing outline is that the first step is to prepare the sample to be tested, then the soil sample is compacted using the standard method. Then the sample is placed in the compression machine and after applying the seating load, the test is initiated and reading is taken for every 0.25 mm interval. Lastly the value of 2.5 mm and 5.0 mm pene tration is recorded, and finally, the CBR value is calculated.But the results our test show that the curve for the bottom is above the curve of the standard this is non correct. Hence there is some source of error. These errors can be due to any reason this could be due to the faulty apparatus, and there might be a permanent error in the dial gauges. There might be some initial reading that could have been considered and not eliminated later. There is a large error seen in the readings of the bottom of the CBR test, the result shows that the CBR value is more than c% that is not possible. So these reading are not considered and discarded. Therefore the CBR value of 5% is constitute as an appropriate value.Then there are certain considerations to be taken while the sample to have accurate readings. Firstly the face of the plunger must be leveled onto the sample face and no kern should be there. Then the surcharge plate must also be placed which forget restrict from the heaving of the soil.