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What is swell pressure test of soil and it’s laboratory procedure?
What is the equation of A-line in the plasticity chart?
Fine grained soils are classified based on the plasticity chart. The equation of A line is ; Ip=0.73(liquid limit -20) Ip=plasticity index
Fine grained soils are classified based on the plasticity chart. The equation of A line is ;
Ip=0.73(liquid limit -20)
Ip=plasticity index
See lessWhy we conduct soil penetration test in soil investigation?
As a civil engineer to check the geotechnical properties of soil, three guests must be performed the shear test, bearing test, and penetration test. A penetration test is performed by three methods, standard penetration test A dynamic cone penetration test Cone penetration test or Dutch cone penetraRead more
As a civil engineer to check the geotechnical properties of soil, three guests must be performed the shear test, bearing test, and penetration test.
A penetration test is performed by three methods,
In Geotechnical engineering, the value of standard penetration test is widely used for determining technical properties of soil.
This test is globally used to determine various engineering and geotechnical properties for soil investigations.
See lessWhat is Braced Excavation?
Braced excavation is a method where deep excavations with straight vertical faces are laterally supported by a sheeting and bracing system until the structure is built. In deep excavations creating a safe slope on the excavation face just for safety is generally not feasible due to high cost, inabunRead more
Braced excavation is a method where deep excavations with straight vertical faces are laterally supported by a sheeting and bracing system until the structure is built.
In deep excavations creating a safe slope on the excavation face just for safety is generally not feasible due to high cost, inabundance of space and other structures present nearby. So, the excavation is temperorly supported by sheets/walls and struts, which are removed individually when their requirements cease. Relatively flexible sheets/walls are placed against excavation walls and supported by horizontal struts which in turn resist the earth pressure in compression.
Some methods are vertical timber sheeting, shoring, steel sheet piling, soldier beams and also tiebacks.
These structures might not be removed later but they may or may structurallynot be structurally important apart from offering temperorly lateral support. For example, tie backs support excavations and also replace permanent retaining walls.
See lessI have confusion regarding proctor compaction test. As per Is code 2720: 8, soil sample used should be sieved through 19mm sieve.Then what is the relevance of 4.75mm sieve? Please clarify me regarding the soil sample and the usage of ...
As per Is code 2720: 8 section 4.1.1, Sieve No.4 is used to check whether aggregation materials after they have been broken into individual particles. and only individual particles shall be retained on the sieve no. 4. So, sieve No. 4 is used to check whether the aggregation materials have been brokRead more
As per Is code 2720: 8 section 4.1.1, Sieve No.4 is used to check whether aggregation materials after they have been broken into individual particles. and only individual particles shall be retained on the sieve no. 4. So, sieve No. 4 is used to check whether the aggregation materials have been broken down properly or not.
Based on ASTM D698-00a, Sieve no. 4 used to determine the method of compaction test. This Standard provides three Method of testing namely Method A, Method B, and Method C.
Method A may be used if 20 % or less by mass of the material is retained on the No. 4 (4.75-mm) sieve.
Method B Shall be used if more than 20 % by mass of the material is retained on the No. 4 (4.75-mm) sieve and 20 % or less by mass of the material is retained on the 3⁄8-in. (9.5-mm) sieve.
Method C —Shall be used if more than 20 % by mass of the material is retained on the 3⁄8-in. (9.5-mm) sieve and less than 30 % by mass of the material is retained on the 3⁄4-in. (19.0-mm) sieve.
See lessWhat is the submerged density and degree of shrinkage?
Submerged density or bouyant density is the density of a mass of soil as observed under water in a saturated condition of course. Suppose you are calculating the density when the soil mass and you yourself are submerged. It is calculated as the difference of the soil density in air and the density oRead more
Submerged density or bouyant density is the density of a mass of soil as observed under water in a saturated condition of course. Suppose you are calculating the density when the soil mass and you yourself are submerged. It is calculated as the difference of the soil density in air and the density of water, divided by the density of water.
SD = (density of soil – density of water) / density of water
or
SD = density of soil in air – 1
It is also defined as the mass of soil minus the mass of water displaced by it upon submergence, divided by the volume.
This concept is particularly useful in determining the bouyancy of submerged soils and is crucial in equations of sediment transport in rivers. If the bouyant density equals 1, the soil just floats. If it gets negative, soil will rise in water.
Degree of shrinkage is another concept. It is the amount of water content reduction needed to bring the soil to its shrinkage limit, expressed as percent of the original water content.
See lessHow can we differentiate clay and silt apart from its sizes?
Here, from a geotechnical perspective you can’t differentiate silt and clay on the basis of grain size because it can be irrelevant to material behaviour. Silt and clay are both the result of the physical and chemical breakdown of the minerals in rocks. They main difference is in chemical compositioRead more
Here, from a geotechnical perspective you can’t differentiate silt and clay on the basis of grain size because it can be irrelevant to material behaviour.
Silt and clay are both the result of the physical and chemical breakdown of the minerals in rocks. They main difference is in chemical composition and particle size.
Silt is composed of silicate minerals, or those containing silicon and oxygen.
Clay is composed of metal silicates, or silicates with metals like magnesium or aluminum associated with it.
But in terms of handling the two as part of an experiment, the main discernible difference is particle size. Sand particles are larger than silt particles which are in turn larger than clay particles. Silt particles are about 0.05 to 0.002 millimeters in size. Clay particles are smaller than micrometer in size. So silt particles are too small to really be felt with your fingers like grains of sand. But wet silt will feel very smooth like finely ground baking flour. Clay particles are so small that they will simply feel sticky. You won’t be able to move them around your fingers like silt particles. This stickiness will be the main difference between the two in terms of touch.
See lessWhat is Relative Compaction? How it is used on-site?
Relative compaction is a ration of the density of soil at site to the maximum dry density of soil. like we have maximum dry density of soil have 1800 kg/m3 which determine in lab now on site we can archive 1700 kg/m3 by compaction of dumped soil so relative density of that soil on site is =1700/1800Read more
Relative compaction is a ration of the density of soil at site to the maximum dry density of soil.
like we have maximum dry density of soil have 1800 kg/m3 which determine in lab
now on site we can archive 1700 kg/m3 by compaction of dumped soil
so relative density of that soil on site is =1700/1800=0.9444 = 94.44%
it is use for
Neenu S K
The objective of a swelling pressure test on soil is to determine the swelling pressure of expansive soil when it is not allowed to undergo any volume change. The volume change is arrested or the soil is not allowed to swell in order to test this. The test determines the intrinsic swelling pressureRead more
The objective of a swelling pressure test on soil is to determine the swelling pressure of expansive soil when it is not allowed to undergo any volume change. The volume change is arrested or the soil is not allowed to swell in order to test this.
The test determines the intrinsic swelling pressure of the expansive soil. The test is conducted on a consolidometer. More details are explained in IS 2720(Part 41):1977.
The swelling pressure is dependent on the:
- Clay Content in the soil
- Moisture content
- Stress history
- Drying and wetting cycles of soil
- The nature of the pore fluid
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