# 15 Things Only Civil Engineers Know – Interesting Engineering

Civil engineers have a very particular set of skills. Skills they have acquired over a very long time in engineering school. Skills that make them a nightmare to city planners and architects. Here are 15 things only civil engineers know.
Portland cement, high alumina cement, white cement, sulphate resisting cement. The list goes on. As civil engineers, we have a pretty good idea of what goes into different cements, how they work, and what we could add to make them perform better.

Us civil engineers know that there are four types of road curves: simple, compound, reverse, and deviation. We know how to use the right equations to design a road with each one of these curves. Not only that, but we know how to calculate what slope the road needs to be in the curve to keep cars from sliding off the road.
[Image Source: Giphy]
As a civil engineer, I probably love concrete a little too much. It is gray and mushy, then it soon turns into strong rock. If that’s not what love looks like, then I don’t know what is. In all seriousness though, we know how dry concrete is at certain points in its curing cycle. We also understand that concrete technically continues to dry and strengthen over its entire lifespan.
We know the minute size differences between silt (.05 to .002 mm), sand (2mm to .05mm), and clay(<.002 mm). Some of us may not even have to calculate the particle size, we can just look at the soil and know. Along with these tidbits of knowledge, we can determine which combinations of soil make for better foundations and what needs to be done to make the ground more suitable for construction.
Civil engineers know that there need to be expansion joints in roadways and railways to allow the metal to expand and contract with temperature. If these aren’t built into the infrastructure, then the roads and railways can fail or bow.
I don’t know how many times I’ve heard someone refer to cement as concrete – the inside of me just cringes. We know that concrete is cement with a fine and coarse aggregate and that mortar has a higher amount of cement with added fine aggregate like sand. Cement alone is simply the binding material. Civil engineers probably also know that those trucks that carry concrete aren’t called cement mixers, which is wrong anyway, they are called transit mixers.
[Image Source: Giphy]
One of the less glamorous parts of civil engineering is knowing how to handle wastewater. We know that sewage has to flow over 3 feet per second in horizontal pipes. We also know that if sewage flows too fast, like over 12-18 feet per second, then dangerous gasses can be produced and everyone has a bad day. There’s a lot more science around handling your waste than you may think.
Civil engineers know their way around surveying equipment. We know that a total station uses a GPS, lasers, and leveling sensors to measure precise elevations and distances to develop point clouds. Theodolites or auto levels simple can detect the change in elevation between two points, without distance measurements.
There are hundreds of different kinds of trusses, each with their own specific structural loading capabilities. Civil engineers know when to use a certain truss and how to calculate their strength.

[Image Source: Caudill Truss and Metal]
Every civil engineer remembers their first structures class. We also remember that calculating loading values is so complicated that you can get different answers with different methods. We also probably realize that no loading calculation is 100 percent right, so we slap on some factor of safeties to cover ourselves.
Civil engineers probably understand that the Leaning Tower of Pisa was kept from collapse thanks to some ingenuitive geotechnical engineering. Engineers kept the tower from collapsing by placing weights on the north end of the foundation to right the structure. Now it is believed that the structure will survive for hundreds of more years.
As a civil engineer, you probably have caught yourself once or twice figuring out where exactly the water from your house flows to. Civil engineers are trained to design infrastructure that never gets seen, so we have a keen sense of where all of our utilities are routed.
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Rebar isn’t just a steel rod that gets put into concrete – anything but. Civil engineers understand what the different external patterns on rebar are for and how each kind is used. There’s European rebar, carbon steel rebar, epoxy coated rebar, and the list goes on.
The cone of depression has always been one of my favorite things about civil engineering. A cone of depression is a depression in an aquifer’s water table when water is drawn out of it through a well. It’s also a great way to explain to your friends how you feel when you are doing your fluids homework.
Civil engineers understand that dirt is a crazy complex thing and all sorts of weird tests are needed to understand it. Tests like the standard penetration test, determining the Atterberg limits, or the oedometer test. If you see an odd little device in a civil engineer’s office, it might be to test some small property in the dirt.
If you want to know more about any of these things, you should get a civil engineering degree… or you can just Google them. You should probably just Google them and avoid the debt. If you are too lazy to Google and you are interested in the degree, here’s a post that might help you.

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