Volume Change Apparatus

LabTek is a renowned manufacturer, supplier, solution provider and exporter of Concrete testing machines, building and civil engineering laboratory equipment and accessories. We are supplying the equipment to quality testing laboratories civil builders, civil contractors, Engineering colleges, Universities and Polytechnics. We manufacture the best quality Automatic Compression testing machines, Semi Automatic or Digital Compression testing machines, Electrical cum Hand Compression testing machines, Hand operated or Manual Compression testing machines or Cube Testing Machines or Compressive strength testing machines as per the international standards and specifications. automatic volume change apparatus, volume change apparatus.

compression testing machines

Volume Change Apparatus

Make: LabTek

Model: SL-2060

Origin: India

Standards: ASTM C 490, IS 4031 & BS 1881

Specification: The apparatus comprises of one mould effective gauge length complete with base plate, four reference pins, one length comparator frame, one stainless reference bar with insulated grip, and one dial gauge, 0.002mm x 5mm

 

 

Automatic Compression testing machines, Semi Automatic or Digital Compression testing machines, Electrical cum Hand Compression testing machines, Hand operated or Manual Compression testing machines or Cube Testing Machines or Compressive strength testing machines as per the international standards and specifications. automatic volume change apparatus, volume change apparatus.

Automatic Compression testing machines, Semi Automatic or Digital Compression testing machines, Electrical cum Hand Compression testing machines, Hand operated or Manual Compression testing machines or Cube Testing Machines or Compressive strength testing machines as per the international standards and specifications. automatic volume change apparatus, volume change apparatus.

Before volume changes resulting from drying or wetting of hardened concrete are discussed, autogenous volume changes should be mentioned because they occur where little or no change in total moisture content is possible and are of particular importance in the interior of mass concrete. Two opposing effects can be produced. As reaction between water and the unhydrated cement proceeds, the actual volume of the solid increases. This causes stresses through the set structure and results in expansion. At later ages, the water available for the reaction will decrease, resulting in self-desiccation of the cement paste and a shrinkage ranging from 0.001 to more than 0.015 per cent.

The increase in volume of some constituents during their formation has been used as the basis for developing expansive cements. Some, specially prepared, undergo relatively large expansions at early age so that if used in concrete that is restrained they develop compressive stresses. Later, when drying occurs, the resulting shrinkage that would have developed is partly or completely offset, and compressive stresses no longer exist in the concrete.

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