What is known as Geofoam What is known as Geofoam borisdavenport (Industrial) (OP) 20 Feb 17 16:27 Hi, I recently found that one of our neighbors used a white colored material for landfilling named Geofoam. Anyone knows what is this exactly? Does it cause any kind of soil pollution? RE: What is known as Geofoam IRstuff (Aerospace) 20 Feb 17 19:56 see link TTFN (ta ta for now) I can do absolutely anything. I'm an expert! https://www.youtube.com/watch?v=BKorP55Aqvg FAQ731-376: Eng-Tips.com Forum Policies forum1529: Translation Assistance for Engineers Entire Forum list http://www.eng-tips.com/forumlist.cfm RE: What is known as Geofoam bridgebuster (Civil) 27 Feb 17 01:11 Perfectly safe RE: What is known as Geofoam msquared48 (Structural) 27 Feb 17 03:34 Used frequently in backfill conditions to lower lateral pressures to retaining walls. No worries. Mike McCann, PE, SE (WA) RE: What is known as Geofoam dik (Structural) 27 Feb 17 06:23 This may absorb water considerably... you might be looking for closed-cell extruded polystyrene... in Canada, Type 4 for UV exposure. Dik RE: What is known as Geofoam EireChch (Geotechnical) 1 Mar 17 11:51 In my experiences this types of materials are ok for low bearing pressures from slabs but when there is point loads involved they are not so good. There are different types that are suitable for different uses so i would always check with the supplier (and get confirmation via email, not a phone call). RE: What is known as Geofoam OldBldgGuy (Structural) 3 Mar 17 00:24 Hopefully it's buried so there is no UV exposure, but an added benefit is eliminating frost effects under it or if it is adjacent to a foundation. Not sure where you are, but we have to worry about it here. RE: What is known as Geofoam OSUCivlEng (Civil/Environmental) 6 Mar 17 19:44 Back when I worked for the Kansas DOT we replaced a large portion (>10,000 C.Y.) of a brand new bridge embankment with Geofoam. That was in 2005 and as far as I know it's still performing well. It had a crushed rock underdrain which also worked quite well. The plans also specified to wrap the outside surface of the Geofoam with a strip drain (Mirafi I believe). This was basically a black dimpled plastic with a black geotextile glued to the the dimpled side. In the heat of the summer day the black plastic heated up significantly and "softened" (i.e. melted). It also melted the Geofoam underneath it. Fortunately we discovered this pretty quickly and kept the strip drain covered up as soon as it was placed so it couldn't heat up. RE: What is known as Geofoam fattdad (Geotechnical) 6 Mar 17 20:25 there are no third-party detriments. As a neighbor, I'd not worry. There are two design concerns with geofoam. One is buoyancy. If the ground water table inundates enough of it, it'll pop out of the ground. That can be addressed by design. The other is attack by hydrocarbons. If diesel fuel, gasoline or other such compound leaks into the ground it'll dissolve. In practice, we cover the geofoam by HDPE or other such membrane. I'd put my feet up on the coffee table and go back to enjoying life! f-d ípapß gordo ainÆt no madre flaca!