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.
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.
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.
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.
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.
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.
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.
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.
Water-Cement Ratio Law – Abrams’ Law, Formula and IS 456 Application
Complete guide to water-cement ratio law – Abrams’ Law formula, mechanism (capillary porosity), IS 456:2000 Table 5, Feret’s formula, Powers’ gel-space ratio, and 3 solved numericals.
Tensile Strength of Concrete – Split Test, Formula and Importance
Complete guide to tensile strength of concrete – why concrete is weak in tension, split cylinder test IS 5816, formula, IS 456:2000 modulus of rupture formula and design applications.
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.
