Description:

This device is used to maintain cell pressure constant for a long duration and the system can be used in place of conventional constant pressure system using mercury pots where certain minimum heights are required. Problems like deaeration of pump, leakage of mercury etc. are eliminated in this system. This unit is smaller in volume and cab be used in mobile Laboratory also. This can maintain pressure in the cell upto 20kg/cm sq. Pressure is maintained constant in the system by a balancing calibrated weighs on a spindle against a column of oil, operating under constant feedback.  

Construction:

The system consists of an oil pump continuously driven by an electric motor during the test period.

The internal components are housed in a strong compact housing.

The piston on which weights are kept rotates with minimum friction A transparent Oil water vessel is provided to transmit pressure to the cell.

A hand pump provided facilitates priming and to maintain constant pressure during power failure.

Moisture tins are used to determine moisture contents in soil and other material.

These are made from aluminum or stainless steel.

Sizes available are

(a) 25 mm dia.,

(b) 50 mm dia.,

(c) 75 mm dia.,

(d) 80 mm dia. 

(e) 100 mm dia.

 

This is Useful to determine specific gravity of clays, sand and gravel of size smaller than 10mm.

 

Specification:

Comprises a 1 kg glass jar with brass cone, locking ring and rubber seal.

 

Consolidation Apparatus is a soil testing lab apparatus that is built as per IS 270 (Part XV) Standards. Consolidation test is un-dimensional test considered extremely important in soil mechanics.

 

Sample taken from adjacent areas of a single site show different settlement even when tested using same techniques. Soil of similar strength may show varying consolidation. Samples are very carefully prepared and vertical settlement of the specimen in saturated or drained conditions carefully recorded when known load is applied.

 

Specification:

It consists of the following: 

• Loading unit, maximum capacity 20 kg/cm sq. having a loading yoke connected to a lever arm with a counter balancing adjustment and having a lever ration of 1:1, the whole assembly being mounted on a sturdy steel frame stand.

• The loading unit is so designed that it can be used for consolidation cells of different diameters as well as different dia floating ring type consolidation cells.

• Fixed ring type consolidometer (Odeometer) cell assembly for testing 60mm dia. x 20mm thick specimen comprising:

• Fixed ring for specimens 60mm x dia. 20mm. thick with guide ring.

• Top and Bottom Porous stones for 60mm dia. specimens.

• Perforated Pressure pad, Channeled base with water inlet and Gasket.

• Flanged Water Jacket, water reservoir with plastic tube and pinch cock.

• Set of weights to give a pressure of 10kg/cm.sq. on 60mm dia. specimen, comprising: 7nos. 0.05 kg/sq.cm., 5Nos. 0.1 kg/sq.cm., 6Nos. 0.2kg/sq.cm. and 5 Nos. 1.0kg/sq.cm. Supplied complete as above but without dial gauge.

 

Information of Shear values plays an important role the design of sub-structures in determining bearing capacity of soils, design of retaining walls, instability calculation earth slopes etc. Various Shear Apparatus are available and Direct Shear Apparatus is one of them. In Direct Shear test specimen contained in a box is subjected to a constant normal load and increasing horizontal load is applied to the upper section of the specimen. Shear force and load are directly measured. For determination of the direct shear strength of soils on specimen size 60 mm x 60 mm x 25 mm.

Specification:

The apparatus comprises of the following:

Loading Unit: Supplied with load yoke with direct and lever system for applying load. Normal stress capacity 8kg/sq.cm. Load is applied either directly of through a counter balanced detachable lever. Provision is made for load to be applied either through a steel ball recessed in the loading pad or direct through a boss on the pre calibrated loading yoke. The loading unit is provided with V strips and roller strips for frictionless movement of shear box housing.