Wash boring is a relatively old method of boring small-diameter exploratory holes in fine-grained cohesive and non-cohesive soils. It was widely used in the USA in the first half of this century, but has been largely replaced by power auger methods. It is still used in areas of the world where labour is relatively cheap, for example southern Brazil. Continue reading “Soil Boring with Wash Boring Method”
Augers may be classified as either bucket augers or flight augers. Bucket augers are similar in construction to the flat-bottomed Sprague and Henwood barrel auger. They consist of an open-topped cylinder which has a base plate with one or two slots reinforced with cutting teeth, which break up the soil and allow it to enter the bucket as it is rotated. Continue reading “Soil Boring with auger apparatus”
A. Rubber-Balloon Method
1. Position the density plate on a flat surface and set the volume measuring apparatus in the recessed hole in the density plate.
2. Hold the apparatus down firmly in position, open the control valve, pump the balloon down with the rubber bulb until the water level in the graduated cylinder has reached its lowest position, and record this volume which is the initial reading. Continue reading “Field Density Test Service”
1. Adjust the height of drop of the cup so that the point on the cup that comes in contact with the base rises to a height of 10 ± 0.2 mm at it’s maximum range. The block at the end of the grooving tool handle is a 10 mm gage. Place the 10 mm block edge at the worn spot on the base. Rotate the handle – there should be no discernible click or bump of the cup. Continue reading “Procedure of liquid limit test”
The Atterberg limits are water contents which define the limits of various stages of consistency for fine-grained soils. The liquid limits (LL) and the plastic limit (PL) define the upper and lower limits, respectively, of the plastic of soil; the numerical difference between these two limits expresses the plasticity of a soil and is termed the plasticity index (PI). Continue reading “Atterberg’s Limits Test Service”