Hi Hakan There isn't any humus in linseed oil. Triglycerides and some other stuff, but no humus. Once it's dried (or cured - is there a difference Greg?) it's pretty inert.
>Hi Keith, > >Well in that case I mean humus as in soil and this is >why you have to wash sand and gravel if it contains >humus, before you use it in concrete. That is why I wanted >to see the experiments referred to in the link, >http://www.flaxcouncil.ca/flaxind7.htm >not because I say that it cannot be used, but I want to be >sure. Humus breaks down the concrete and I hate to see >that happen around reinforcement bars, that are dependent on >a good fixation to the concrete. You could write to the Flax Council and ask: [EMAIL PROTECTED] It says: "A testing program completed at the University of Hong Kong in 1996, proved conclusively that linseed oil-based preservatives extend and enhance the life of concrete. Linseed oil-based preservatives have significant potential in areas such as Hong Kong and other parts of southeast Asia. These regions have high concentrations of real estate which is principally concrete." There's more information here: http://www.agr.gc.ca/cb/news/1996/n60626ae.html Successful concrete preservative test opens major Asian market "The testing program was conducted at the University of Hong Kong by Professor Y.K. Cheung, Pro-Vice Chancellor and Head of Engineering, and one of southeast Asia's most senior engineers. The program leader was Dr. H.C. Chan, head of the Civil Engineering Laboratory, at the University of Hong Kong. The University of Manitoba supported the project through the work of Dr. Sami Rizkalla, president of Intelligent Sensing for Innovative Structures (ISIS) Canada and professor of civil engineering. The testing equipment was designed and constructed by the University's engineering team under Dr. Rizkalla's leadership." That will have been high-quality work. This is the Hong Kong research report: "Xie, Y., Kwan, A.K.H., Chan, H.C. and Rizkalla, S.H. Linseed oil-based concrete surface treatment for building and highway structures in Hong Kong. Transactions, Hong Kong Institution of Engineers, Hong Kong, Hong Kong Institution of Engineers, 1999, 6 (1): 36 - 41." >One other sample is that old habit by construction workers to >use concrete floors, before they finished the curing process, >or mixing buckets, as urinary. Very dangerous and things that >was stopped in Sweden 30 years ago, but I have still seen in >Spain. To complete the curing process, (we call it burning, >directly translated from Swedish), takes much longer than >most people think.I have also seen damages from this, that >destroyed costly insulation or load carrying constructions. > >I want to be very clear about that I do not know, if there are >any adverse effects from linseed oil. If not, I want to know >that this is investigated. When it comes to carrying concrete >constructions, I prefer to know than assume. I am a little bit >scary about this things, since I have seen some bad samples >of mistakes and/or unqualified use of materials. HKU's Civil Engineering dept is pretty good. I think Hong Kong has seen perhaps all possible permutations of bad building practices by now, with some fairly horrific consequences. As a result, for quite a long time already, they've had a high level of expertise in investigations, setting standards and controls, in the universities and in government too. I don't think they'll be making any rash mistakes with anything that could affect concrete load factors. I can't help wondering why they didn't try tung oil instead, which is more local at least. No Canadian subsidies maybe. Best Keith >One sample was mentioned, when somebody said that the >grey plastic pipes was generally used in heated floors during >a period. I do not know in which country, but it did not surprise >me, must have been a less developed country without the >sufficient knowledge about materials. > >As a surface treatment of cured concrete, it should be no >problems at all, but I still would be interested in the specifics >of any investigation and the benefits. > >Hakan > > >At 06:43 AM 12/17/2002 +0900, you wrote: > >Hi Hakan > > > >I'm confused by your saying "humus material". Do you mean organic > >material, or biological material? Humus is what you get in soil, or > >should if it's still alive, complicated stuff. Sorry, after what > >we've just been saying about English! :-) > > > >Linseed oil or flaxseed oil is a drying oil, why it's used in paints > >and varnishes (I'm sure you know this), and also why it's not a very > >good idea in your motor. It polymerizes, and becomes relatively inert > >and impervious. Don't you think treatment of reinforcement bars with > >linseed oil would be okay as long as the linseed oil was allowed to > >dry (set) first before pouring the concrete? It's a lot like a > >plastic coating. Well, it is a plastic coating. > > > >Best > > > >Keith > > > > > > >I am saying that humus material is bad for concrete before it is cured, > > >please look at my message. Concrete does not cure properly with humus > > >material, which is one of the first things you learn about concrete. I > > >asked for documentation of investigations that it could be used in/on > > >concrete before it has cured. I see no reason why it should be bad after, > > >but to suggest treatment of reinforcement bars after the >concrete cured is > > >a little bit difficult. To mix cement with biological material is normally > > >a no-no and I have seen many such mistakes in control inspections. > > > > > >I thought my message below was clear on the point of before or after. > > > > > >Hakan > > > > > >At 12:13 PM 12/16/2002 -0700, you wrote: > > > >Could you please elaborate? You keep saying humus or humus partials > > is bad > > > >for concrete, but, that is all you say. Why would boiled linseed oil > > be bad > > > >for concrete after it has cured? > > > > > > > >Greg H. > > > > > > > >----- Original Message ----- > > > >From: "Hakan Falk" <[EMAIL PROTECTED]> > > > >To: <biofuel@yahoogroups.com> > > > >Sent: Monday, December 16, 2002 10:04 > > > >Subject: Re: [biofuel] Steel roofing plus other building links -(Was > > > >embodiedenergy) > > > > > > > > > > > > > > > > > > If you put linseed oil on a cured floor it is one thing. >But it you put > > > > > humus particles in concrete before it is cured, I know that >it can be a > > > > > disaster. > > > > > > > > > > Hakan Biofuel at Journey to Forever: http://journeytoforever.org/biofuel.html Biofuels list archives: http://archive.nnytech.net/ Please do NOT send Unsubscribe messages to the list address. To unsubscribe, send an email to: [EMAIL PROTECTED] Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
