MECHANICAL TESTING LAB

CUBES, CORES, FINE & COARSE AGGREGATES

COMPRESSION STRENGTH

Compression Strength is the capacity of a material or structure to withstand loads tending to reduce size, as opposed to tensile strength, which withstands loads tending to elongate. In other words, Compression Strength resists compression (being pushed together), whereas tensile strength resists tension (being pulled apart). In the study of strength of materials, tensile strength, Compression Strength, and shear strength can be analysed independently.

COMPRESSIVE STRENGTH OF CUBE

The strength of controlled by the proportioning of cement, coarse and fine aggregates, water, and various admixtures. 

“The compressive strength of concrete is given in terms of the characteristic compressive strength of 150 mm size cubes tested at 28 days (FCK).

Compressive strength is the ability of material or structure to carry the loads on its surface without any crack or deflection. A material under compression tends to reduce the size, while in tension, size elongate

  • Cement strength,
  • Quality of concrete material
  • Quality control during
  • Production of concrete

COMPRESSIVE STRENGTH OF CORE

Compressive Strength Test on Drilled Concrete Cores is required to determine the strength of hardened concrete in structure. Following are the specification for drilled concrete cores to be suitable for compressive strength test.

Core cutting is common in construction in which the chief material used is stone, terra-cotta, concrete brick or cemented concrete blocks. The method is used on a variety of projects. These include dams, piers and wharves, parking garages, nuclear power plants, sewage treatment plants, chemical plants, interstate highways and bridges. 

COMPRESSIVE STRENGTH OF CEMENT

Cement is the major raw material used in any construction. Therefore quality of cement must be checked before using it as a building material. Following tests can be performed on cement in laboratory to check its quality.

REBOUND HAMMER

Rebound Hammer Test:

Rebound hammer test method is based on the principle that the rebound of an elastic mass depends on the hardness of the concrete surface against which the mass strikes

  • To assess the uniformity of the concrete
  • To assess the quality of the concrete based on the standard specifications
  • Rebound hammer test method can be used to differentiate the acceptable and questionable parts of the structure or to compare two different structures based on strength

FIELD DENSITY TEST OF SOIL BY SAND REPLACEMENT METHOD

The sand cone method is used for field density test in our highway construction. In the field, the dry density test is carried out for check the compaction of layers.

The dry density of the compacted soil or pavement material is a common measure of the amount of the compaction achieved during the construction. … Therefore field density test is importance as a field control test for the compaction of soil or any other pavement layer.

Determination of field density of cohesion less soil is not possible by core cutter method, because it is not possible to obtain a core sample.

GRADATION APPARATUS​

Fine and coarse aggregate test sieve analysis

The main purpose of Sieve analysis of aggregates is to determine the particle size distribution of the coarse and fine aggregates.

In a gradation and size analysis, a sample of dry aggregate of known weight is separated through a series of sieves with progressively smaller openings. Once separated, the weight of particles retained on each sieve is measured and compared to the total sample weight. Particle size distribution is then expressed as a percent retained by weight on each sieve size. Results are usually expressed in tabular or graphical format. Graphical displays almost always use the standard 0.45 power gradation graph.

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GRADATION APPARATUS​