List of Contributions

"Geotechnical Materials in Construction" by Marian & Ramond Rollings is a good reference covering many topics. ------------------------------ DeWayne Heintz P.E., M.ASCE Engineer Jefferson County Secondary Roads Fairfield IA ------------------------------

Arsadie, A well designed asphalt overlay should provide 20+ years of service. I'm not sure about the rest of the U.S. but the Iowa Department of transportation utilizes an electronic reference library that can be accessed by anyone. https://iowadot.gov/erl/ IM 510 details the steps for asphalt ...

You are experiencing the same issue that our county engineers in Iowa, USA experience. Here the weight limits are "waived" during harvest allowing grain trucks to haul as much as they can hold and "farm wagons" have no limit. My guess is that you will want to explore triage options on spot failures. ...

The total gradation of the stone is important in determining if water will percolate through the material. There must also be someplace for the water to go once it reaches the bottom of the layer or you will have created a bath tub. You need interconnected voids in the stone and sub-drains to provide ...

I'm not sure if the maximum size is as important as the gradation of the material. My experience is limited to Iowa where a 3/4" to 1" topsize material uniformly graded with 10 - 15% passing the 200 screen is a common material. A 1.5" top-size "modified granular subbase has become more popular in recent ...