Quote:
Originally Posted by bunt_q
Our roads today area perfect example. The choice between asphalt and concrete is driven in large part by funding sources - we can't fund maintenance for asphalt.
|
Concrete is far more expensive per linear foot, particularly if done correctly: at least 8 inches thick with some rebar. However, well laid concrete lasts far longer binding sand and gravel than does asphalt. Asphalt, unless laid down upon properly designed expensive rubber(like) mats, is very vulnerable to water, and, it's evil ice twin.
The question, as you know, remains what road does one redo in concrete at a far higher cost than does one do in new asphalt or patch work, based upon some combination of taxes, possible bond issues, and, neighborhood political will.
The primary problem with redoing roads lined with businesses in concrete is the length of time. Businesses, particularly those not somewhat protected via franchise generally operate on quick receivables and 90 day payables. In essence, many operate on a 90 day cushion and, after those 90 days, either have to borrow money to service debt or increase cash flow, possibly via new long term tax credits that can lower the cost of borrowing that money. Regardless, most small businesses facing paralleling roads prefers asphalt resurfacing to rebuilding such roads with continuously cast concrete.
Concrete is not the best patch material, and, is far stronger when laid down full width.
This a metaphor for all infrastructure.