Complete notes on Curing of Concrete: definition, 7 objectives, cement hydration process (C3S → C-S-H), minimum curing duration table (IS 456 Cl.13.5), strength gain vs curing age table (OPC vs PPC), effects of inadequate curing, and exam FAQs.
Complete maintenance and rehabilitation notes: 3 types (preventive 1×, corrective 5-10×, emergency 50-100×), IS 456 Cl.17 decision sequence (core test avg≥0.85fck → load test → strengthen), rehabilitation techniques table (10 distress types), life cycle cost 1:5:50, post-repair monitoring.
Complete jacketing notes: RC jacketing (100mm min, epoxy dowels, surface roughening 5-6mm, IS 13935), steel jacketing (plates+grout, minimal section, IS 800), FRP wrapping (CFRP/GFRP, IS 15988, negligible weight), comparison table, surface prep, exam FAQs.
Learn how to select the correct water-cement (W/C) ratio for concrete mix design using IS 456:2000 and IS 10262:2019. Includes exposure condition limits, step-by-step procedure, solved example, and a complete diagram. Essential guide for civil engineering students and professionals.
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.
Complete guide to permeability of concrete – pore structure, factors affecting permeability, Darcy’s law, water penetration and RCPT tests, and practical control measures.
Complete guide to shrinkage of concrete – five types (plastic, drying, autogenous, thermal, carbonation), magnitude (200-800 microstrain), IS 456 design value, factors and control.
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.
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.
Complete guide to creep of concrete – definition, mechanism, IS 456 Table 2 creep coefficients, effective modulus formula, factors affecting creep and effects on structures.
