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Why the size of concrete cubes are 150mm?
Basically, the force supplied by a concrete compression machine is a definite value. For normal concrete strength application, say below 50MPa, the stress produced by a 150mmx150mmx150mm cube is sufficient for the machine to crush the concrete sample. However, if the designed concrete strength is 100MPa, under the same force (about 2,000kN) supplied by the machine, the stress under a 150mmx150mmx150mm cube is not sufficient to crush the concrete cube. Therefore, 100mmx100mmx100mm concrete cubes are used instead to increase the applied stress to crush the concrete cubes. For normal concrete strength, the cube size of 150mmx150mmx150mm is already sufficient for the crushing strength of the machine.
How strong is 8000 psi?
8000 psi (pounds per square inch) is a measure of pressure that indicates a very high strength level, commonly found in materials like high-strength concrete or specialized steel. For context, standard concrete typically has a compressive strength of around 3000 to 4000 psi, making 8000 psi significantly stronger. This level of pressure can withstand heavy loads and is often used in construction and engineering applications requiring durability and resilience.
Different between cube and cylinder in concrete compressive test?
The difference in compressive strength is due to the difference between the modulus of elasticity of concrete and that of the steel which is used to apply the compressive force on the concrete. The pressure applies a lateral confinement pressure which is equal to d/3 meaning that for the cylinder, 2d/3 is confined leaving d/3 unconfined whereas for the cylinder 2d/3 is confined means all of the cube is confined. This leads to the cube having a higher compressive strength that the cylinder. For more information, try to read about the triaxial test and the effect of confinement on the compressive strength of soil samples.
How do you estimate the placing of rebars?
The placement of steel reinforcing is dependent on the requirements of the strength and load-bearing of the concrete. A structural engineer should be contacted in this regard.
What is the full meaning of B R C in construction and uses?
In construction, BRC stands for "British Reinforced Concrete," which refers to a type of steel reinforcement mesh commonly used in construction projects to provide structural strength to concrete elements such as slabs, walls, and columns. The BRC mesh is manufactured by welding together high-strength steel wires in a grid pattern, creating a durable and flexible material that helps distribute loads and prevent cracking in concrete structures. The use of BRC mesh in construction helps improve the overall integrity and longevity of the concrete elements, making them more resistant to stresses and deformations.
