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Burnt clay bricks are the most common building material in India.
Classification:
| Class | Crushing Strength | Water Absorption | Use | |---|---|---|---| | First Class | > 10.5 N/mm² | < 20% | Exposed brickwork, arches | | Second Class | > 7 N/mm² | < 22% | General construction | | Third Class | > 3.5 N/mm² | < 25% | Temporary structures |
Standard brick size: 190×90×90 mm (with mortar: 200×100×100 mm) Brick bonding: English bond (strongest), Flemish bond, Header bond
Ordinary Portland Cement (OPC) — most widely used.
Types:
Setting Time (Initial/Final): Min 30 min / Max 600 min (OPC)
Mild Steel (Fe 250): Yield strength 250 MPa. Used for general structures. High Yield Strength Deformed (HYSD) Fe 415/500: Higher strength, ribbed bars for better bond with concrete.
Concrete: Mixture of cement, fine aggregate (sand), coarse aggregate (gravel/stone), and water.
Mix Proportions:
| Grade | Cement:Sand:Aggregate | Characteristic Strength | |---|---|---| | M15 | 1:2:4 | 15 N/mm² | | M20 | 1:1.5:3 | 20 N/mm² | | M25 | 1:1:2 | 25 N/mm² | | M30+ | Design Mix | 30+ N/mm² |
Water-Cement Ratio: W/C = weight of water / weight of cement
Workability Measures:
Admixtures:
Curing: Maintaining moisture and temperature for 28 days to allow hydration. Methods: Water curing (ponding, spraying), membrane curing (plastic sheet), steam curing.
Surveying: Art of determining relative positions of points on earth's surface.
Chain Surveying:
Compass Surveying:
Leveling:
Rise and Fall Method: Rise = Previous reading - Current reading (if positive, rise) Fall = Current reading - Previous reading (if positive, fall)
Soil: Unconsolidated material consisting of mineral particles, water, and air.
Three-Phase System:
Important Index Properties:
| Property | Formula | Description | |---|---|---| | Void ratio (e) | e = Vᵥ/Vₛ | Volume of voids / Volume of solids | | Porosity (n) | n = Vᵥ/V | Volume of voids / Total volume | | Degree of saturation (S) | S = Vw/Vv | Water volume / Total void volume | | Water content (w) | w = Mw/Ms | Mass of water / Mass of solids | | Bulk density (ρ) | ρ = M/V | Total mass / Total volume |
Atterberg Limits:
Soil Classification:
Permeability: Darcy's Law: q = kiA (k=permeability, i=hydraulic gradient, A=area)
Types of Loads:
Support Types:
| Support | Reactions | Movement Allowed | |---|---|---| | Pin/Hinge | 2 (V, H) | Rotation allowed | | Roller | 1 (V) | Rotation + horizontal movement | | Fixed | 3 (V, H, M) | No movement |
Determinacy: Beams with n reactions and 3 equilibrium equations.
Bending Moment and Shear Force Diagrams:
CPM (Critical Path Method):
Bar Chart (Gantt Chart): Simple visual schedule — activities on Y-axis, time on X-axis.
Quality Management:
Safety in Construction:
Q1: Calculate the characteristic compressive strength of M25 concrete. M25 concrete has characteristic compressive strength = 25 N/mm² (or 25 MPa) as measured on 150mm cubes at 28 days. This means 95% of test specimens should exceed this value.
Q2: A soil sample has mass 450g wet, 380g dry. Find water content. w = (Mw/Ms) × 100 = ((450-380)/380) × 100 = (70/380) × 100 = 18.4%
Q3: Define slump and its significance. Slump is the vertical settlement (in mm) of a fresh concrete cone when the mold is lifted. It measures workability/consistency. Higher slump = more workable (easier to place) but may mean excess water (weaker concrete). Standard slump 25-75mm for general construction, up to 125mm for pumped concrete.
Complete Civil Engineering Diploma notes — surveying, building materials, concrete technology, structural analysis basics, soil mechanics, and construction management.
52 pages · 2.6 MB · Updated 2026-03-09
M20 means characteristic compressive strength of 20 N/mm² at 28 days. M25 = 25 N/mm². Higher M-grade = stronger concrete. M20 used for general construction, M25+ for structural members.
Lower W/C ratio = stronger concrete (more cement per unit water). But too low = workability problems. Typical range 0.4-0.6. Reducing W/C by 0.1 increases strength by about 20%.
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