Concrete is composed of cement, aggregate (including crushed rock and sand) and water. In homes, it's frequently seen in the foundation, driveway, sidewalk, patio, and stone walls. Note that bricks use mortar in the joints, not concrete.

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How can I pour a concrete pad with a circular hole in it?

Essentially, I'd like to put down a concrete pad for a patio, but leave a couple of circular areas within that patio unpaved (for planting shrubs). I'm familiar with the techniques for using ...
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How can I fill a void in a concrete seawall?

My concrete seawall (on a freshwater lake) has a void in a bottom corner. It seems to have been created with the void -- it's not a result of trapped water freezing and pushing out a chunk. I'd like ...