Advances in Structural Engineering

Advances in Structural Engineering By:- D. Y. Sayed: 

Advances in Structural Engineering By:- D. Y. Sayed

Need for High Performance Concrete: 

Need for High Performance Concrete Reduce the waiting time for the service of the structure Reduce c/s of the members Enhance the durability Increase flexural strength, modulus of elasticity Economize the construction Saving labour by reducing reinforcing steel

Types of High Performance Concrete: 

Types of High Performance Concrete Self Compacting Concrete Reactive powder Concrete High Durability Concrete Ultra High strength Concrete Steel Fiber Reinforced Concrete Shotcrete

Considerations for HPC: 

Considerations for HPC Structural Environmental External Loads Material & Mixes The Construction Process

MICRO-SILICA CONCRETE: 

MICRO-SILICA CONCRETE Micro-Silica or Silica Fume Concrete (SFC) is a new type of High Performance Concrete developed which is much stronger than conventional concrete.

Micro Silica Concrete: 

Micro Silica Concrete Allows structures to hold more weight. Reduces seepage through structures. Resists abrasion, chemical and Sulphate attack. Helps structure become more durable and last longer. Improves bond strength and protects reinforcement from corrosion.

Principle of Work in SFC: 

Principle of Work in SFC Pozzolonic Effect : - OPC + H 2 O CSH + Ca(OH) 2 Ca(OH) 2 + SiO 2 H 2 O + CSH 2. Micro-Filler Effect : - Voids are filled up by silica particles making it homogeneous.

Advantages of SFC: 

Advantages of SFC High Strength and good bonding. Easy to place and compact. Prevents segregation and bleeding. No need of admixtures for water proofing. Skilled labour not required for operations. Reduces risk of Plastic shrinkage failure.

Applications of SFC: 

Applications of SFC Corrosion Resistance Sulphate Resistance Heat Reduction Waterproof Concrete Shot Crete Abrasion Resistance Chemical Resistance

Compacting, Finishing & Curing: 

Compacting, Finishing & Curing Compacting Finishing Curing Can be easily compacted. No new methods or equipments required. Mechanical vibrators very effective. Steel finishing equipments. Can be power-floated to glass like finish. Finishing can start immediately after compaction. Insulated curing blanket retains heat in concrete. Reduced temperature gradient & improved strength gain.

Health Hazards: 

Health Hazards Pulmonary and respiratory disorders. Immunological abnormalities observed in patients with silicosis, such as chronic renal disease. Fine particulate pollutant and should not be exposed to for a long time. Silica fume contains traces of crystalline quartz and needs to be handled carefully.

Conclusion: 

Conclusion ‘ HPC can mean the difference between a 30-year life for a building and a 75-year life.’ High-performance concrete reduces lighter, longer precast members, smaller-diameter columns, and members that creep less. HPC’s increased durability results in longer-lasting bridges.

PowerPoint Presentation: 

THANK YOU