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High Strength Concrete
Concrete is a composite material made by mixing different materials like cement, sand, aggregate, and water with or without admixture. Concrete is one of the most popular and widely used materials extensively used for roads, buildings, bridges, and dams, and also used for sidewalk ways, pipes, and drains. While producing high-strength concrete more emphasis is laid on research and quality control when compared to conventional concrete. It has now been used in the construction field to build long-span bridges, dams, high–rise buildings, and also to retain walls, tunnels, etc.
High-strength concrete has a compressive strength that is normally above 6,000 psi, which is more than twice as strong as conventional concrete. The use of less water to cement results in the concrete becoming denser and less porous, increasing its strength.
High-strength concrete is stronger and more durable because air entrainment is reduced in it. The capacity of high-strength concrete to endure more loads and stresses than conventional concrete is one of its main advantages. Due to its tremendous load-bearing capability, it is the perfect material for use in buildings and other structures like bridges and tunnels that need to support heavy loads. High-strength concrete’s greater strength also increases its resistance to abrasion, chemical assault, and weathering, which can lengthen its lifespan.
Uses of high- strength concrete include building high-rise buildings by reducing column sizes and increasing available space. To enhance the durability of bridge decks and meet the specific requirements of certain applications, high-strength concrete is necessary for constructing the superstructures of long-span bridges.
They are also designed for special applications in terms of increased durability, higher modulus of elasticity, and improved flexural strength. The other applications of high-strength concrete include grandstand roofs, parking garages, marine foundations, and heavy-duty industrial floors. In India ready–mix concrete is widely used in all large construction projects. The making of high-strength concrete should have the right proportion of construction materials such as concrete, superplasticizer, silica fume, the shape of aggregate, cementation materials, etc. When compared to the procedures used for conventional concrete the production, transportation, placement, and finishing of high-strength concrete could differ significantly. Hence, during construction extra measures have to be taken to protect against plastic shrinkage and thermal cracking in thicker sections.