Soil mechanics and foundation engineering mcq test set. The maximum dry density and optimum moisture content o. Both the tests help to determine the optimum moisture content that is required for soil to attain maximum compaction i. I p w l w p w l water content at ll w p water content at pl i p. Plates used for asphalt have a water tank and sprinkler system to prevent asphalt from sticking to the bottom of the baseplate. To get the maximum dry density and optimum moisture content, standard proctors compaction test was conducted on fresh geopolymer mortar. Maximum dry density an overview sciencedirect topics. To determine field moisture, samples weighing approximately 50 grams are taken each 5 feet down, especially when the soil is wet, or above optimum moisture content. This omc value is with respect to the specific amount of compaction energy applied to the soil. Pdf the processing of optimum moisture content for specific soils as indicated by. Wed like to understand how you use our websites in order to improve them.
Compaction can prevent the build up of large water pressures that cause soil to. Maximum dry density of soil and optimum moisture content test. The variation of the dry density with fluidtobinder fb ratio is shown in figure 15. Determine the maximum dry density and the optimum moisture. The determination of maximum dry density and optimum moisture content of the soil is a measure of compaction level of soils. To get the maximum dry density and optimum moisture content, standard proctors compaction test was conducted. Soil compaction compaction is the application of mechanical.
If a mechanical apparatus is used, it must be monitored through the adot. Pdf correlation of maximum laboratory dry density and optimum. Pdf a proposed approach for evaluating soils optimum moisture. The main objective of this study is to evaluate the optimum moisture content value based on computing average moisture content. The heavier the plate, the more compaction force it generates. Laboratory determination of compaction properties namely the maximum dry density and optimum moisture content is both time consuming and costly. Determination of maximum dry density and optimum moisture content of soil is. As the water content increases, water films are formed around the soil grains and water around the soil grains act as lubricant. This test is done to determine the maximum dry density and the optimum moisture content of soil using heavy compaction as per is. Laboratory soils testing 1970 engineer manual em111021906, u.
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. Soil compaction is a method which improves physical and mechanical soil. In geotechnical engineering, soil compactionis the process in which a stress applied to a. An earth dam require one hundred cubic meter of soil compacted with unit weight of 20. Optimum moisture content an overview sciencedirect topics. The optimum moisture content omc or optimum water content owc is the moisture content at which the soil attains maximum dry density. The fluid media to prepare the mortar was water and various alkaline solutions of different molarities for comparison. 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. Need for determining optimum moisture content omc of the soil. Since soil may be in many layers, it is likely that there will be more than one type of soil in any cut. Test method for determination of optimum moisture content of soil. Density of soil w optimum optimum moisture content. Due to this, soil grains come close to each other and make a dense configuration. Optimum moisture content for compaction of in situ soil at a residential construction site on five mile prairie, wa.
Home geotechnical engineering determination of maximum dry density and optimum moisture content of soil is. A proposed approach for evaluating soils optimum moisture. See appendix a1 of the materials testing manual for information. Indian institute of technology gandhinagar department. It is the range of moisture content over which a soil exhibits plasticity. Performancebased measurement of optimum moisture for soil. The correlation of compaction properties of soil with various soil parameters are investigated. At optimum moisture content, soil reaches the maximum unit weight as lubrication effect is the maximum at this stage.1395 1047 1363 810 117 24 1364 1195 867 794 618 145 368 1226 896 726 1306 1491 1280 427 1055 50 665 374 1060 471 1593 1351 1509 453 546 1486 718 728 1015 245 103 1039 450 937 999