The maximum dry density and optimum moisture content o. Soil mechanics and foundation engineering mcq test set. Density of soil w optimum optimum moisture content. To get the maximum dry density and optimum moisture content, standard proctors compaction test was conducted on fresh geopolymer mortar. Soil compaction is a method which improves physical and mechanical soil. Due to this, soil grains come close to each other and make a dense configuration. If a mechanical apparatus is used, it must be monitored through the adot. See appendix a1 of the materials testing manual for information. A the dry density reduces by addition of water after attaining optimum moisture content b the line joining the peak of three moisture content graphs obtained by using three compactive energies, is called line of optimus c well graded coarse grained soils can be compacted to a very high density as compared to fine grained soils. Need for determining optimum moisture content omc of the soil. Indian institute of technology gandhinagar department. Maximum dry density of soil and optimum moisture content test.
Optimum moisture content for compaction of in situ soil at a residential construction site on five mile prairie, wa. Compaction can prevent the build up of large water pressures that cause soil to. Performancebased measurement of optimum moisture for soil. Pdf a proposed approach for evaluating soils optimum moisture. An earth dam require one hundred cubic meter of soil compacted with unit weight of 20. Optimum moisture content an overview sciencedirect topics. This can be measured by mainly two methods standard proctor compaction test and modified proctor compaction test.
The main objective of this study is to evaluate the optimum moisture content value based on computing average moisture content. Home geotechnical engineering determination of maximum dry density and optimum moisture content of soil is. The optimum moisture content omc or optimum water content owc is the moisture content at which the soil attains maximum dry density. Maximum dry density an overview sciencedirect topics. The determination of maximum dry density and optimum moisture content of the soil is a measure of compaction level of soils. I p w l w p w l water content at ll w p water content at pl i p. Pdf correlation of maximum laboratory dry density and optimum. As the water content increases, water films are formed around the soil grains and water around the soil grains act as lubricant. A proposed approach for evaluating soils optimum moisture.
The heavier the plate, the more compaction force it generates. At optimum moisture content, soil reaches the maximum unit weight as lubrication effect is the maximum at this stage. Since soil may be in many layers, it is likely that there will be more than one type of soil in any cut. Laboratory soils testing 1970 engineer manual em111021906, u.
This test is done to determine the maximum dry density and the optimum moisture content of soil using heavy compaction as per is. It is the range of moisture content over which a soil exhibits plasticity. To get the maximum dry density and optimum moisture content, standard proctors compaction test was conducted. The variation of the dry density with fluidtobinder fb ratio is shown in figure 15. The correlation of compaction properties of soil with various soil parameters are investigated. This omc value is with respect to the specific amount of compaction energy applied to the soil. Determine the maximum dry density and the optimum moisture. Determination of maximum dry density and optimum moisture content of soil is. Plates used for asphalt have a water tank and sprinkler system to prevent asphalt from sticking to the bottom of the baseplate.
If the material of the base of thecasagrande liquid limit device on which the cup containing soil paste drops is softerthan the standard hard rubber, then. Test method for determination of optimum moisture content of soil. Wed like to understand how you use our websites in order to improve them. Both the tests help to determine the optimum moisture content that is required for soil to attain maximum compaction i. Laboratory determination of compaction properties namely the maximum dry density and optimum moisture content is both time consuming and costly.
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