The top of the concrete should be slanted to accept the first stones used in the arch. To determine this angle, I suggest you build a tiny model of your bridge or make a detailed scale drawing.

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Few engineering projects have the scope, costs or risks involved in building a new bridge. San Francisco Bay Area residents got a peek at what's involved, when builders place the first segment of ...

The bridge is called Striatus and was created using an additive process featuring concrete blocks that form an arch-like a traditional masonry bridge. The compression-only structure allows forces ...

1. It all begins at the prestressed concrete plant. 2. This is called a prestressing strand. Made of high strength steel, it will soon be embedded in concrete. 3. The prestressing strand is ...

By those estimates, you could build at least 1,000 wildlife bridges and still spend less than America does each year on vehicle-animal collisions.

The Federal Highway Administration is studying how to make stronger concrete at lower cost in high volumes for bridges and other infrastructure. Four UHPC matrices with fine aggregates only and three ...