Civil Engineering 2M

Types of Concrete Mix

Concrete mix ratios determine the strength and durability of concrete structures. A poor mix (1:5:7) is used for low-strength works like floor bases and simple filling. A standard mix (1:3:5) provides medium strength for footings and slabs, while a rich mix (1:2:3) offers high strength for columns, beams, and structural members requiring better durability.

Gabion Retaining Wall Design Details

A gabion retaining wall is a gravity wall made from wire mesh baskets filled with stones. It is used to retain soil, prevent erosion, and improve slope stability in roads, rivers, bridges, and hill areas.

Main Components

Gabion Box/Basket – Steel wire mesh cage filled with stones

Stone Fill Material – Hard, durable rocks providing weight and stability

Wire Mesh & Lacing Wire – Connect and hold the baskets together

Geotextile Filter – Prevents soil loss while allowing water drainage

Drainage Layer & Pipe – Reduces water pressure behind the wall

Foundation Material – Compacted base for proper support

Key Advantages

Flexible and durable structure

Excellent drainage performance

Eco-friendly and economical

Suitable for erosion control and slope protection

Easy maintenance and long service life

Typical Uses

Highway and railway embankments

Riverbank protection

Hill slope stabilization

Bridge approach protection

Landscaping retaining structures

Column Layout & Reinforcement Details

Concrete pouring

Great job