Concrete Testing Machines

The proving rings are made of special steel, carefully forged to give maximum strength and machined to give high sensitivity commensurate with stability, ensuring long life and accuracy. Loading pads have female threading 1/2" BSF (16 tpi).. The rings are supplied complete with Works Calibration Chart, individually packed in polished wooden boxes. Proving rings to meet special requirements are also available on request. Separate polished and ground pair of Loading Pads for Compression Proving Rings and pair of Shackles for Tension Proving Rings are provided, to suit each proving ring, at extra cost

This is for the determination of lateral extension of 150 mm dia x 300 mm high cement concrete cylinders while testing them under compression. The extensometer consists of two movable frames pivoted at one end. A dial gauge measures the lateral extension, and a removable spacer strip is for the initial setting of the dial gauge. Mounting of extensometer on the specimen is with the help of screws. Supplied complete, with a dial gauge 0.002 mm x 5 mm.

IS:9459
The apparatus can be used for three basic tests :

• Initial drying shrinkage - The difference between the length of the cured specimen and the length when it is dried.
• Drying shrinkage - The difference between the length of the specimen from existing structure and its length when completely dried
• Moisture movement - The difference between the length of the dried specimen and its length when again saturated with water.

This apparatus is used for determination of the strain and deformation characteristics of cement concrete cylindrical specimens of 150 mm dia x 300 mm long. The Compressometer consists of two frames for clamping to the specimens by means of five tightening screws with a hardened and tapered end. Two spacers hold the two frames in position. An adjustable pivot rod rests on pivot screws. A spring enables the pivot rod to remain in contact with pivot screws.