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Cob Is Linseed Oil All You Really Need? - Exp. 2brad davis bradavis at direct.caWed Apr 15 20:27:17 CDT 1998
Harry, John, Bill, and others, Thanks again for the caveats of good information and comments. Good information will help answer the ultimate question: Is Linseedoil All You Really Need? Repeats It is always a good thing to repeat all or parts of experiments to check for consistant results. Classification charts and data tables could be made available once results become established. Rain Rainfall needs to be measured for now on and the submerged samples should be in collected rainwater. Temperature and general weather conditions should be observed daily. Lime & Linseed Oil I am naturally always thinking about Experiment 2. Obviously, what worked best in Experiment 1 will get priority. It interesting to hear that linseed oil applied to Lime, works better after the Lime has taken some time to react. I will apply the oil at different time periods in accordance with the recommendations given below by Harry and John. Harry Snip "On lime mixes, I would recommend coating the lime/sand mix after it is almost hard - "thumb print hard" - then rubbing in the oil. This is what McDonald describes in "the History of Plaster" as being able to make lime /sand plaster hard and polished as marble." John Snip "Linseed oil should not be applied to fresh lime-cement plasters because their initial alkalinity is to high. The linseed should be added after about one year if possible. The application to dry clay is probably OK, and your results are very encouraging." The Linseed Oil/Lime Series 1. Oil rubbed into 2 sand/1 lime when the plaster is " thumb print hard." 2. Sample will be 2 sand/1 lime with oil rubbed in "one year if possible." 3. Sample will be Cob with Linseed Oil rubbed in (Exp.1) then sand/lime applied. Do you guys think I need to wait for awhile to apply the sand/lime after the application of Linseed Oil(3)? 4. Combinations of: 1&2, 3&1, 3&2. Tests in Experiment 2 will also include other oils, soaps, etc. US/ICOMOS Newsletter No. 6 (1995) In this newsletter there is a section titled "Using Chemicals To Save Adobe." by Charles Selwitz, Getty Conservation Institute. The article states that there are three methods used to treat adobe. 1. Consolidation which is the process where a suitable, reactive chemical in liquid form is allowed to soak into porous stone or adobe where it sets up and hardens so that the adobe is no longer turned to mud when in contact with water. The Institute used a product called Stone Strenghener for consolidation. My guess is Linseed Oil is a consolidator but I am probably wrong. 2. Substituting some of the water that is mixed in the sand and clay with an emulsion acrylic polymer in water. 3. Surface treatment with a water repellent. Typically, the polymethylhydrosiloxanes are used. Apparently when the hydrosiloxane contacts clay, bonding occurs between the polymer and adobe to provide for exceptional stability. El Ray Adobe Protector is a polymethylhydrosiloxane. I was thinking of testing this product. It is expensive but it would be interesting to see how it measures up to Linseed Oil and the like. Thoughts and Comments Welcome. Bye for Now. Brad
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