Tired of your asphalt buckling?

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Now that the snow and ice have melted off your driveway, you will probably be surprised by the damage that was not there last fall. If your driveway could talk, it would say that it needs some repairs as well as regular care and maintenance.

In these northern states, buckling can be caused by frost heave in the spring or even from driving very heavy vehicles or machinery on the driveway repeatedly. CBS visits many sites where the asphalt has buckled as much as eight inches between winter freeze and spring time.

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Many times upon excavation of the driveways, we find that not only is the soil comprised of organic clay, but many times, eluvial clay is also present. These two soils should always be removed prior to laying asphalt atop, as they will never dry out, and the freeze cycle will turn the wet clay into a larger ice cube.

The other issue that we find every day, is the installation of an insulation board under the soil, between the block foundation and the wet soils. This insulation board not only traps water at the block foundation, it also creates absolutely no thermal break, as many contractors believe it does.

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As you can see in the pics, the trapped water eats away at the block and helps the wet clay to retain more liquid, exacerbating the freeze/thaw cycle. When builders/developers put in driveways and sidewalks, there should always be a soil correction of poor soils, and the sub rate beneath the asphalt topping should be no less than “cobit” that will compact to a density of 95 percent to ensure the asphalt will retain its elevation.

If you see your concrete or asphalt toppings move at your home, winter to spring…call CBS for an evaluation!

Choosing Ice-Melts

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Ice-Melts

As we speak, our social media newsfeeds are blowing up with snow warnings, schools are closing, business meetings are being rescheduled, and families are stocking up for the incoming storm in Minneapolis.  If you are making last minute runs to the store, be sure to acquire the proper ice-melt that fits your home’s needs. Below is a chart, put together by Consumer Reports, that can help you determine which product is right for your home.

Keep in mind that certain products effect asphalt and concrete differently. According to a recent study, magnesium products “are the most damaging to the concrete”, specifically Calcium magnesium acetate (Lee, 5). Within the same study, sodium chloride products were discovered to be the least detrimental to concrete.  As far as asphalt is concerned, acetate products can be disadvantageous because of their tendency “to break down the bonds between aggregate and asphalt binder” (consumer reports, 1).  The chart below provides many options for safe asphalt de-icers.

Ice-Melts Comparison

For more information and tips on de-icing best practices, check out the following link: http://www.consumerreports.org/cro/2014/02/best-ice-melts/index.htm .

 

If you are noticing large build-ups of ice around your home check out what our engineer and consultants have to say http://cbsmn.com/blog/?p=149 about PERMANENTLY fixing the problem.  

 

Sources:

“Best Rock Salt and Ice Melts Review – Consumer Reports.” Best Rock Salt and Ice Melts Review – Consumer Reports. N.p., Feb. 2014. Web. 02 Feb. 2016.

Lee, H., R. D. Cody, A. M. Cody, and P. G. Spry. EFFECTS OF VARIOUS DEICING CHEMICALS ON PAVEMENT CONCRETE DETERIORATION. Proc. of Mid-Continent Transportation Symposium 2000, Center for Transportation Research and Education, 2711 South Loop Drive. N.p.: n.p., 2000. 151-55. Print.