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Strength of Materials · Chapter 5 Bending Stress in Beams Pure Bending · Flexure Formula · Section Modulus · MOR · Composite Beams · Flitched Beam · Uniform Strength · Biaxial Bending M/I = σ/y = E/R Z = I/y_max σ = m·σ_other σ = ±My/I ± P/A 📋 Table of Contents 5.1 Effect of…
Strength of Materials · Chapter 6 Shear Stress in Beams Shear Stress Formula · Rectangular · Triangular · Circular · I-Section · Other Sections · Composite Beams τ = SAȳ/Ib τ_max(rect) = 3S/2bd τ_max(circ) = 4S/3πR² τ_max(tri) = 3S/2bh at h/2 📋 Table of Contents 6.1 Shear Stress Distribution — General Formula (Derivation) 6.1.1 Rectangular…
Complete Alkali-Aggregate Reaction notes: 3 types (ASR, ACR, ASiR), ASR mechanism 6 steps, SiO₂+NaOH gel formation, 3 essential conditions triangle, reactive aggregates table, map cracking symptoms, IS 456 Cl.5.4.1 (3 kg/m³ limit), fly ash/GGBS prevention, AAR test methods (ASTM C1260, C1293), and exam FAQs.
Complete corrosion of reinforcement notes: passive film protection, electrochemical mechanism (anode Fe→Fe²⁺, cathode O₂ reduced), carbonation-induced (x=k√t, pH drop), chloride-induced (pitting, Fick’s law), IS 456 cover table (20–75mm), effects (cracking, spalling, section loss), prevention methods.
Complete notes on Causes of Deterioration of Concrete: physical (freeze-thaw, abrasion, thermal, shrinkage, cavitation), chemical (carbonation x=k√t, chloride, sulphate, AAR, acid), mechanical, biological, construction defects, IS 456 Table 3 exposure classes, and exam FAQs.
Complete RMC notes: definition, 3 types (transit mix, central mix, shrink mix), step-by-step plant to site process, IS 4926:2003 requirements (90 min limit, slump tolerance ±25mm, batching tolerances), quality control at plant and site, advantages vs limitations, and exam FAQs.
Complete Quality Assurance Tests notes: fresh tests (slump, CF, Vee-Bee, flow table), hardened tests (cube IS 516, split tensile IS 5816, flexural MoR), sampling frequency (IS 456 Table 14), acceptance criteria (Cl.16), failure action sequence (core test → load test), and exam FAQs.
Complete FRC notes: definition, 4 types of fibres (steel, glass AR, PP, carbon), crack bridging mechanism, aspect ratio, fibre volume fraction, properties improved (toughness ↑200-600%, flexural ↑30-80%), mix design, balling prevention, and applications in tunnels, industrial floors, and fire-resistant structures.
Complete Core Cutting Test notes: definition, when required (IS 456 Cl.17.4), equipment, IS 516 Part 4 procedure, h/d correction factors table, IS 456 acceptance criteria (avg ≥0.85fck, min ≥0.75fck), core vs cube strength comparison, and exam FAQs.
Complete UPV Test notes: definition, principle (V=L/T), 3 transmission modes (direct, indirect, semi-direct), IS 13311 Part 1 procedure, pulse velocity quality table (>4.5 to <2.0 km/s), factors affecting UPV (reinforcement, moisture), SONREB method, and exam FAQs.
