Concrete refers to a composite material that is essentially composed of elements such as cement, aggregates ( such as sand and gravel) joined together by water. The mixing proportions of the materials determine the strength and quality of the concrete.
Concrete is a requisite component of the construction process, therefore, it is important to subject it to quality tests to determine its condition.
Here are six important tests that help to determine the quality of fresh and hardened concrete:
a. Water Permeability Test
A water permeability test is taken to ascertain the durability of the concrete and its resistance against water under hydrostatic pressure.
This type of test is taken from substructures concrete elements such as foundations, concrete water tank, retaining wall etc.
b. Slump Test
Slump tests are taken to determine the workability and consistency of concrete. These tests are carried out from batch to batch to check the consistent quality of concrete during construction work.
Factors such as moisture content, particle size distribution, air content and temperature could influence a slump test.
c. Compressive Strength Test
Compression strength refers to the ability of a material to carry a compressive load without cracking or fracturing. A compression strength test, therefore, is a method used to measure the highest amount of compressive load a material can support.
The Compressive strength of concrete is dependent on constituents such as the cement strength, water-cement ratio, etc. The test is usually implemented on a cube, prism or cylinder.
d. Rapid Chloride Ion Penetration Test
Similar to the Water Permeability Test, the Rapid Chloride Ion Penetration Test is carried out to determine the durability of concrete. The test assesses the resistance of a concrete sample to the penetration of chloride ions.
e. Air Content
Air entrainment is a significant component of concrete mixtures that are exposed to freezing and thawing environments, as it helps to ensure that the concrete is durable.
To measure the air content in fresh concrete, as well as the variation in the volume of concrete with a change in pressure, it is important to conduct an air contest test.
f. Unit Weight
A unit weight test is done to measure the air content of a concrete mix and confirm that the volume of concrete is in accordance with the approved project mix plan. It is important to help you verify that you have the volume of concrete you requested.
At Geophase Resources Limites, we prioritise quality control and assurance, including standard concrete tests.