Industry Background: Concrete and Construction

You do not need to become a civil engineer. You need to understand four things about concrete: why demand rises and falls, why it is so heavy on carbon, why the costs are so hard to control, and why competition is local. Get those and you can explain almost any decision ABC makes.

Why cement is the carbon problem

Students often assume the pollution comes from mixing or from the lorries. It does not. Nearly all of it comes from one step: turning limestone and clay into cement.

That step needs enormous heat, so a lot of fuel gets burned. On top of that, heating limestone releases carbon dioxide that was locked inside the rock. So even if you powered the kiln with clean energy, you would still get emissions. This is why cement is so hard to decarbonise and why regulators keep targeting it.

Who competes with whom

The industry has some very large multinationals — names such as Holcim, Heidelberg Materials, CEMEX and CRH — that own cement plants, concrete factories and quarries in many countries. Alongside them sit strong national producers, like UltraTech in India or Vulcan Materials in the United States.

Here is the twist that catches people out. Even those global giants mostly compete locally. Concrete is heavy and starts to set, so hauling it a long way is slow and expensive. A firm in one region is rarely competing with a firm three countries away; it is competing with the plant down the road.

The three main product types

Demand goes up and down

Concrete sells to construction, and construction follows the economy. When governments and developers are building, demand is strong. In a downturn, projects are paused or cancelled and sales fall quickly. Economists call this cyclical demand, and it is a permanent feature of the industry.

The cost squeeze

Three costs dominate, and none of them are fully in a producer’s control.

• Raw materials. Limestone, clay, sand and gravel. If quarrying gets more expensive or supply tightens, unit costs rise.
• Energy. Kilns need a lot of heat, so fuel and electricity prices feed straight into the cost per tonne.
• Transport. Concrete is dense and heavy, so fuel prices matter twice — once in the kiln and once on the road.

Add tightening emissions rules, which cost money to comply with, and you can see why efficiency is not a nice-to-have for ABC. It is the main defence of its profit margin.

Where the growth is

Demand is growing fastest in emerging markets, especially parts of Asia and Africa, driven by population growth and urbanisation. Governments there are building roads, railways, housing and energy projects, and all of it needs concrete.

In developed economies demand is steadier. Most of the infrastructure already exists, so spending shifts towards renovation, replacement and lower-carbon materials. Public projects increasingly require sustainable materials, which is exactly the door low-carbon concrete walks through.

Recycled aggregates

When old buildings and roads are knocked down, the concrete can be crushed and reused as aggregate in new concrete. This is already common in road construction in countries such as the UK and the Netherlands.

The advantages are obvious: less waste going to landfill, less new quarrying, less damage to landscapes. The limit is quality. Construction materials have to meet strict safety standards, and recycled aggregate cannot always fully replace natural stone, especially in buildings.