Questions and Answers
Which code provides guidelines for concrete mix proportioning?
What type of loads does IS 875:1987 specifically address?
Which material is NOT listed under Section 2 of IS 456:2000?
Which section of IS 456:2000 is primarily concerned with material and workmanship inspection?
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Which of the following is an example of a retarding admixture?
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What does the characteristic compressive strength, denoted as fck, represent?
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According to IS 456: 2000, how is the mean strength of concrete defined?
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What is indicated by the range of slump values for concrete used in road works?
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Which of the following tests is preferable for low workability in measuring concrete workability?
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What impact does long-term creep have on Young's modulus of elasticity of concrete?
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Study Notes
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.
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Description
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.
