Lec 5 - Void Ratio & Degree of Compaction Explained | Relative Density | GATE Civil Engineering

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Welcome to **Civil Tutor – GATE Exam Notes!** In this lecture, we explain **Void Ratio, Maximum and Minimum Void Ratios, Degree of Compaction, and Relative Density** in Soil Mechanics with clear diagrams, important formulas, and exam-oriented concepts. 📚 **Topics Covered:** 🔹 **1. Void Ratio (e)** - Definition and significance of void ratio - Relationship between volume of voids and volume of soil solids - Formula: e = Vv / Vs 🔹 **2. Three-Phase System of Soil** - Soil solids, water, and air - Volume relationships in partially saturated soil 🔹 **3. Maximum and Minimum Void Ratios** - Loosest state and densest state of granular soil - Cubic and close-packed arrangements - Maximum and minimum void ratio concepts 🔹 **4. Degree of Compaction / Relative Density Index** - Importance in cohesionless soils such as sand and gravel - Natural, maximum, and minimum void ratios - Relative density formula: Dr = [(emax − enatural) / (emax − emin)] × 100% 🔹 **5. Determination of Void Ratios** - Maximum void ratio (emax) - Minimum void ratio (emin) - Natural void ratio (enatural) 🔹 **6. Interpretation of Relative Density** - Very loose - Loose - Medium - Dense - Very dense 🔹 **7. IS 2720:1973 Classification** - Relative density ranges - Degree of compactness of cohesionless soils 🎯 **Who Should Watch?** ✅ GATE Civil Engineering aspirants ✅ Geotechnical Engineering students ✅ Civil Engineering undergraduate students ✅ Students preparing for university examinations Subscribe to **Civil Tutor** for GATE Civil Engineering notes, Soil Mechanics concepts, important formulas, and easy-to-understand lectures. 👍 Like | 💬 Comment | 🔔 Subscribe #SoilMechanics #VoidRatio #DegreeOfCompaction #RelativeDensity #GATECivilEngineering #GeotechnicalEngineering #CivilEngineering #CTCivilTutor

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27 October 2026