Details about High Performance Concrete (HPC)
Now-a-days, High Performance Concrete (HPC) is gaining popularity. HPC denotes superior concrete performance throughout wet stage (mixing & placing process); with greater strength in hardened stage together with a greater strength in long-run as compared to normal concrete.
The HPC is comprised of different chemical cum mineral admixtures and fibres. In HPC, the proportions are designed, or engineered, to create the strength and durability required for the structural and environmental requirements of the project.
High-strength concrete contains a specified compressive strength of 8000 psi (55 MPa) or higher. Special mixing, placing, and curing practices are required to develop and manipulate high-performance concrete. Normally, comprehensive performance tests are essential to show compliance with specific project requirements.
High-performance concrete is mainly utilized in tunnels, bridges, and tall buildings due to its strength, stability, and high modulus of elasticity. It is also been applied in shotcrete repair, poles, parking garages, and agricultural applications.
High-performance concrete characteristics are developed for particular applications and environments; some of the properties that may be required include:
• High strength
• High early strength
• High modulus of elasticity
• High abrasion resistance
• High strength and permanence in rigorous environments
• Low permeability and diffusion
• Defiance against chemical attack
• High resistance against frost and deicer scaling damage
• Toughness and impact resistance
• Volume stability
• Ease of placement
• Compaction devoid of segregation
• Inhibition of bacterial and mold growth
High-performance concretes are developed with cautiously chosen high-quality materials and optimized mixture designs; these are batched, mixed, placed, compacted and cured with reference to the superior industry standards.
Normally, such concretes will contain a low water-cementing materials ratio of 0.20 to 0.45. Plasticizers are normally utilized to produce these concretes fluid and workable. High-performance concrete almost always contains a greater strength as compared to normal concrete.
High-early-strength concrete, also known as fast-track concrete, attains its specified strength at an initial age as compared to normal concrete. The time period in which a specified strength should be attained may vary from a few hours (or even minutes) to several days. High-early-strength is achieved by employing conventional concrete ingredients and concreting practices, although sometimes special materials or techniques are necessary.