Construction, Industry
The construction radical and the construction kanji are the same! This kanji also means industry, which is what construction is, if you think about it. It's all part of the construction industry.
Know your radicals and you'll know this kanji's meaning.
こう, く
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Every time a kanji uses the こう reading (there are a lot!), we'll use the character こういち. He's one of the people who started this website, so we'll do our best in the mnemonics to embarrass him as much as possible. Like this: You see some construction in front of you. There, standing shirtless (only suspenders and a hard hat) is こういち, looking back at you.
If こういち as a construction worker somehow doesn't make your legs tremble, that's okay. Just make sure you take this story to a ridiculous enough level to construct a memory in that brain of yours. Be mad at him for not following construction site regulations — where's his shirt, shoes, and pants, and why is he using the bulldozer like that?! Alternatively, say you really like what you see (you're going to have to imagine a much better-looking version of こういち's face, though). You and こういち make eye contact a little too long. He nods, puts his cigarette out, and takes off his hard hat, letting his long Fabio-esque locks flow. You beckon him over and he comes. What happens next is up to you and your own imagination. My guess is you have a very deep conversation about kanji and the best ways to learn it. Hint: When you see 工 in a kanji, it will often take the こう reading. Remember that, because it comes up quite a bit!