Civil Engineering Name of Student: Shrinkage Limit It is the maximum water content at which a reduction in water content will not cause a decrease in volume of the soil mass.
When considering the plastic limit test, amount of finger pressure used and the shape of the tips of fingers varies to a great extent and, in addition, operators frequently do not carry out the test using the tips of the fingers as specified in the British Standard since these are eminently unsuited to the task.
Gather the crumbled thread to determine the water content. The water content that is just sufficient to fill the pores when the Liquid Limit Definition The Liquid Limit, also known as the upper plastic limit, is the water content at which soil changes from the liquid state to a plastic state.
For liquid limit test, the penetration values are plotted against the moisture content. Plasticity It is defined as the property of cohesive soil which posses the ability to undergo changes of shape without rupture or a change in volume. Through out 3 part of the soil classification lab experiment, the soil sample prepared is classified as SPu, Poorly uniformed-graded SAND with slightly silty or clayey in accordance to British Soil Classification System.
When forming the groove, hold the tip of the grooving tool against the surface of the cup and keep the tool perpendicular to the surface of the cup. This property is described as consistency and specifies the state of a remolded and cohesive soil.
Experience shows that soils with high P. Run at least five tests increasing Lab report liquid and plastic water content each time.
The extensive use of plasticity testing can be most rewarding, however the low levels of accuracy coupled with high cost tend to discourage use.
The limit is defined as the moisture content, in percent, required to close a distance of 0.
In addition, these limits are used directly in specifications for controlling soil for use in fills, and in semi-empirical methods of design.
The requirement that each part of the test must be repeatable within fixed limits if observed however, leads to a much improved result. The boundary between the liquid and plastic states; Plastic limit: The stem of the dial gauge is lowered to contact the cone shaft and the reading of the dial gauge is recorded to the nearest 0.
The liquid limit of a soil can be determined using the Cone Penetrometer or the Casagrande apparatus BS The water content at which the soil has such a small shear strength that it flows to close a groove of standard width when jarred in a specified manner.
Even when wet they form hard, durable surface whereas clean sand displaces easily under the load. The liquid limit is the water content at which it will takes 25 blows to close the groove over a distance of 13 mm.
Greater the difference, greater is the plasticity of the soil. Liquid Limit LL or wL - the water content, in percent, of a soil at the arbitrarily defined boundary between the semi-liquid and plastic states. In the terms of accuracy, Atterberg limit is quite unreliable since the test methods often give a wide range of error.
Increasing the thickness of the water films permits the particles to slide past one another more easily. The equation for flow curve is: The liquid limit is generally determined by mixing soils to consistencies just wet and dry of the liquid limit and determining the liquid limit moisture content by interpolation between four points BS The evidence is raised by a major changes which introduced by the British Standard BS was that the preferred method of liquid limit testing became the Cone Penetrometer.
Plasticity Index PI Plasticity Index is the range of water content over which a soil behaves plastically. They are used to determine the suitability of wet cohesive fill for use in earthworks, and to determine the thickness of sub-base required beneath highway pavements Road Research Laboratory They are then placed in oven at least 1 day to obtain the masses of dish with dry soil sample after all the moisture in the soil had evaporated.
The plasticity index is thus 8.
Then, re-roll into a thread. Flow Index The curve obtained from the graph of water content against the log of blows while determining the liquid limit lies almost on a straight line and is known as the flow curve. In this experiment we are adopting the Cone Penetrometer Method rather than Casagrande Method due to the accuracy.
Moisten the sieved soil sample so that it can be easily rolled between your hands. The behavior of the soil, therefore, is related to the amount of water in the system. Calculations and expression of results Liquid Limit: It gives us an idea of the shear strength of soil.
A wide variety of engineering properties of soils have also been correlated to the liquid limit, plastic limit, and plasticity index of soils i.Lab Report - Liquid and Plastic Limit.
Topics: Atterberg limits, Banana Oil Lab Report Jesse Bradford 7/10/14 MTWR Section Introduction In the banana oil lab we began with isopentyl alcohol + acetic acid isopentyl acetate + Water.
We needed for this experiment a hot plate, clamps, pipette, 5mL vial, caps, hoses and a thermometer. Liquid Limit (LL or wL) - the water content, in percent, of a soil at the arbitrarily defined boundary between the semi-liquid and plastic states.
Atterberg's Limits Plastic Limit Definition. The Plastic Limit, also known as the lower plastic limit, is the water content at which a.
test method for liquid limit, plastic limit, and plasticity index geotechnical test method gtm-7 revision #2 august eb page 1 of 16 geotechnical test method: test method for liquid limit, plastic limit, and plasticity index gtm-7 revision #2 state of new york. 4 PLASTIC LIMIT Discussion In our experiment we have determined the liquid from CIVIL ENG CE at Jordan University of Science & Tech.
Lab Report. Uploaded By ali Pages 6 PLASTIC LIMIT Discussion In our experiment we have determined the liquid limit, plastic limit, and plastic index%(4).
the transition from plastic to liquid behaviour is gradual over a range of water contents. OBJECTIVE To determine the liquid limits of soil using cone penetrometer methods.
Documents Similar To Liquid Limit Lab Report. Plastic Limit Test. Uploaded by. Ah Gus. Atterberg Limit: Liquid and Plastic Limit report.
Uploaded by. Abigail Lorico. The liquid, plastic and shrinkage limits are therefore quantified in terms of the water content at which a soil changes from the liquid to the plastic state.
The difference between the liquid limit and plastic limit is the plasticity index. Because the liquid limit and plastic limit are the two most commonly used Atterberg limits, the following.Download