I've noticed over the past few years that my concrete driveway is slowing eroding away. I've read the road/rock salt can erode concrete, so I'm attributing the cause to salt.
Source of salt: I don't add salt much, but the city sprays it over the driveway regularly and there is often salty runoff from the car. In short, I can't think of a way to avoid the salt.
Any ideas how to minimize this effect without buying expensive sealants/treatments?
If the effect is indeed salt, then your best option is to try to avoid the salt staying there for any prolonged time. This is hard to achieve, but you could maybe wash out your driveway after a period where you know there has been used a lot of salt on the roads.
Similarily you could/should wash the bottom of your car to remove salt from it. This also helps the car from rusting, as the salt accelerates the rust process.
But other than this, I do believe you need to look at other forms of treatment of your driveway. You could possibly get some dedicated painting, which could help you a little...
