Creep of Concrete – Definition, Mechanism, IS 456 Coefficients
Complete guide to creep of concrete – definition, mechanism, IS 456 Table 2 creep coefficients, effective modulus formula, factors affecting creep and effects on structures.
Category: Unit 3: Hardened Concrete
Durability of Concrete – IS 456 Requirements and Controlling Factors
Complete guide to durability of concrete – IS 456 definition, 5 exposure classes with W/C limits, nominal cover requirements, threats to durability, and role of SCMs.
Modulus of Elasticity of Concrete – Formula, Values and Uses
Complete guide to modulus of elasticity of concrete – IS 456:2000 formula Ec=5000√fck, computed values for M20 to M50, tangent vs secant modulus, Poisson’s ratio and structural design uses.
Permeability of Concrete – Causes, Tests and Control Measures
Complete guide to permeability of concrete – pore structure, factors affecting permeability, Darcy’s law, water penetration and RCPT tests, and practical control measures.
Shrinkage of Concrete – Types, Causes, Magnitude and Control
Complete guide to shrinkage of concrete – five types (plastic, drying, autogenous, thermal, carbonation), magnitude (200-800 microstrain), IS 456 design value, factors and control.
Stress-Strain Curve of Concrete – Phases, Key Values and IS 456
Complete guide to stress-strain curve of concrete – three phases of behaviour, εc=0.002 at peak, εcu=0.0035 ultimate, IS 456 parabolic-rectangular design stress block.
Sulphate and Chloride Attack on Concrete – Mechanism and Prevention
Complete guide to sulphate and chloride attack on concrete – mechanisms, chemical reactions, IS 456 limits, SRC cement for sulphate, GGBS for chloride, and prevention measures.
Compressive Strength of Concrete – Cube Test, Grades and Factors
Complete guide to compressive strength of concrete – cube test procedure IS 516, grades M10 to M80, characteristic vs mean strength, strength gain with age and all key factors.
Factors Affecting Strength of Concrete – Complete Guide
Complete guide to all factors affecting concrete strength – water-cement ratio (most important), compaction, curing, cement type, aggregate, age, admixtures with quantified effects and IS codes.
Flexural Strength of Concrete – Modulus of Rupture Test and Formula
Complete guide to flexural strength of concrete (modulus of rupture) – beam test procedure IS 516, two-point and centre-point formulas, IS 456 formula fr=0.7√fck, solved numerical.
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