Cement – we might not notice it
because we are virtually surrounded by it; industrialization simply cannot
occur without an ample amount of this building material, and the structure of
nearly every building we enter relies upon it. Since it's so ubiquitous, it
tends to fade into the background and we don't really think about it. But the
truth is that cement – particularly its manufacturing process – has a huge
impact on our environment.
It's not a material we can easily
replace, mostly because we use so much of it. It's used all around the globe
for essential structures such as bridges, roads, and sidewalks, and we've yet
to come up with something that could make for a sufficient replacement. So what
exactly are we compromising in order to industrialize?
The manufacturing of cement results
in the use of lots of energy and the release of lots of emissions. This is the
result of the high temperatures needed to fire the product for hardening. The
main emission that results from making cement is CO2, which comes from both the
heating of the limestone and the burning of fossil fuels. So much cement is
made – about 2.55 billion tons annually – that the industry alone is
responsible for 5% of the emissions of carbon dioxide worldwide.
Though as of right now there are no
viable cement substitutes, many major players in the industry, like
Alex F Bouri, are doing what
they can to mitigate the emissions. For example, the fossil fuels used to heat
the kilns can be replaced with alternative fuels such as natural gas and
recycled fuels. Some companies are coming up with ideas to make more efficient
kilns.
Some industries are finding it
important to find an alternative to limestone, since the calcination process of
limestone is responsible for many of the environmentally detrimental effects of
manufacturing cement. Some companies have already begun to use a blended
mixture, replacing some of the limestone with coal fly ash and other materials.
However, it's difficult to implement this method entirely due to environmental
limitations, though it does help to reduce emissions by as much as 20%.
Limitations have already been put
in place by the government which encourages these manufacturers to do what they
can to minimize their carbon footprints. Some are simply recycling more, and
others are building walls to contain the majority of the pollution. In any
sense, it's an issue that's extremely impactful and will hopefully continue to
make progress.