Indiacon Civil

Engineering Around You

Everyday things on roads, rails and buildings, and why they look the way they do.

Long video

Why concrete roads have lines every 4.5 metres

The long version: joint spacing, dowels and tie bars.

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Short

Why roads have a camber

A slight slope across the road sends rain to the edges.

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Short

One pillar, many loads

What a single column carries and where that load goes.

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Short

Why walls crack

Shrinkage, settlement and heat: reading common wall cracks.

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Short

Why rail tracks have gaps

Steel grows in heat; gaps and modern welded rail handle it differently.

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Short

Bulking of sand

Damp sand takes up more room, so mixes measured by volume need a correction.

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Short

Why some stone drinks water

Water absorption of aggregate and its effect on a mix.

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Short

Why bridges have a gap at the end

Expansion joints let a deck move with temperature.

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Short

Squeezed versus pulled: why steel goes in concrete

Concrete is strong in compression, weak in tension; steel covers the gap.

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Short

Why concrete roads have joints

Cutting joints controls where a slab cracks.

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Short

Prime coat rate

A thin binder layer that bonds a granular base to the asphalt above.

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Short

Tack coat rate

A light coat between two asphalt layers so they act together.

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Short

Slab action, layer action

How rigid and flexible pavements spread a wheel load.

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Short

Three classes of road signs

Mandatory, cautionary and informatory signs and their shapes.

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Last reviewed: 23 Oct 2026. Sources: official publications and cited standards, see sources and policy. Report an error: comment on the related video on YouTube.