Tuesday, March 31, 2009

Roads

After reading David MacCaulay's book City I've been fascinated with the construction of Roman roads. The construction is simple but enduring.

Some have lasted 2000 years and are still being used today although not by semi tractor trailers. Since our road on the property the concept of the roman road might be a good place to start and then add some modern technology. low strength concrete fill.
since roman roads traversed all sorts of terrain their subbase was not always the same. I suspect that's why some have lasted longer than others. But the basic concepts are there. Dig deep enough to eliminate the refuse. Provide a good drainable base varying the layers from large stones to smaller stones. Make sure these are drainable, Secure the edges so the outward forces created by the load of cars and other vehicles does not spread the structure or substructure. Finally, provide a solid top with large paver surfaces. Crown the top finish for drainage.

There is an old granite quarry on site. It would be fantastic to sell more of that in exchange for granite curbs. I have always loved those curbs when they were brought in for new streets or street repaving in the cities I've been in. Wanted to take one home but could never pick the darned thing up.