RCC and Structural Codes Quiz

Important Codes for Concrete and Steel Structures

• IS 456:2000 outlines practices for plain and reinforced concrete.
• IS 800:2007 and IS 800:1984 define limit state method (LSM) and working stress method (WSM) for steel structure design, respectively.
• IS 875:1987 provides criteria for load calculations, including:
  • Part I: Dead load
  • Part II: Imposed load
  • Part III: Wind load
  • Part IV: Snow loads
  • Part V: Special load & load combinations.
• IS 1343:1980 focuses on prestressed concrete design.
• IS 1893:2002 sets standards for earthquake-resistant structures.
• IS 3370:1965 addresses concrete structures for liquid storage.
• IS 10262:2009 is a guideline for concrete mix proportioning.
• IS 13920:1993 relates to ductile detailing of concrete under seismic forces.
• SP 6 (1):1964 is a handbook for structural engineers with practical insights.
• SP 16:1980 aids reinforced concrete design per IS 456:2000.
• SP 23:1982 offers guidance on concrete mixes.
• SP 24:1983 serves as an explanatory handbook for IS 456:2000.
• SP 34:1987 focuses on concrete reinforcement and detailing work.

Sections and Annexures of IS 456:2000

• Contains 5 sections and 8 annexures. Key sections are:
  • Section 2: Material, Workmanship, Inspection, and Testing, which covers essential materials like cement, aggregates, water, and admixtures.

Types of Materials

• Cement: A critical binding material in concrete.
• Aggregates: Essential for concrete mix, varying in size and type.
• Water: Vital for hydration of cement.
• Admixtures: Include:
  • Mineral admixtures like fly ash, silica fume, and rice husk ash.
  • Chemical admixtures, for example:
    • Accelerators (calcium chloride, fluosilicate).
    • Retarders (sodium tartrate, tartaric acid).
    • Water-reducing agents (calcium lignosulphate).
• Reinforcement: Steel bars or mesh used to increase concrete tensile strength.

Concrete Properties

• Strength:
  • Characteristic compressive strength (fck) is the value below which 5% of test results are expected to fail.
  • Mean strength reflects the average, where 50% of the results are expected to pass.
• Young's Modulus of Elasticity: Defined by IS 456:2000; measures the stiffness of concrete.
• Creep and Shrinkage: Affects long-term strength and performance of concrete.

Workability

• Measured by various tests to assess its ease of placement:
  • Compaction Factor Test: Suitable for low workability.
  • Slump Test: Commonly used, varies from 25mm to 150mm.
  • Vee Bee Test: Assesses workability at high levels.
  • Flow Test: Measures very fluid concrete characteristics.

Workability Standards

• Slump ranges for different applications:
  • Concrete for road works: 20-28 mm.
  • Ordinary RCC works: 50-100 mm.
  • Columns and retaining walls: 12-25 mm.
  • Mass concrete: 75-175 mm.
• Correlation between slump values and compacting factors:
  • 0-25 mm slump: 0.78-0.80 compacting factor.
  • 25-75 mm slump: 0.85-0.87 compacting factor.
  • 50-100 mm slump: 0.92-0.935 compacting factor.
  • 100-150 mm slump: 0.95-0.96 compacting factor.

Test your knowledge on the important codes related to Reinforced Cement Concrete (RCC) and structural engineering. This quiz covers key codes such as IS 456:2000, IS 800:2007, and IS 875:1987 among others. Perfect for Kerala PSC aspirants and civil engineering students.