Specification:Poulticing iodine stains from concrete

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=GENERAL=

SUMMARY
 This procedure includes guidance on removing iodine stains from concrete. Iodine stains generally fade and disappear with time. However, if immediate removal is desired, a poultice containing denatured alcohol may be used in stain removal. Safety Precautions:  DO NOT save unused portions of stain-removal materials. DO NOT store any chemicals in unmarked containers. EXCELLENT VENTILATION MUST BE PROVIDED WHEREVER ANY SOLVENT IS USED. USE RESPIRATORS WITH SOLVENT FILTERS. No use of organic solvents indoors should be allowed without substantial air movement. Use only spark-proof fans near operations involving flammable liquids. Provide adequate clothing and protective gear where the chemicals are indicated to be dangerous. Have available antidote and accident treatment chemicals where noted.</li> </ol> </li> See Specification:General project guidelines for general project guidelines to be reviewed along with this procedure. These guidelines cover the following sections:</li> <ol> Safety Precautions</li> Historic Structures Precautions</li> Submittals</li> Quality Assurance</li> Delivery, Storage and Handling</li> Project/Site Conditions</li> Sequencing and Scheduling</li> General Protection (Surface and Surrounding)</li> </ol> These guidelines should be reviewed prior to performing this procedure and should be followed, when applicable, along with recommendations from the State Historic Preservation Officer (SHPO). For additional information on poulticing, see 04455-02-R.</li> </ol> =PRODUCTS=

MATERIALS
<ol type="A">

Denatured Alcohol: <ol> Other chemical or common names include Methylated spirit*.</li> Potential hazards: TOXIC AND FLAMMABLE.</li> Available from hardware store, paint store or printer's supply distributor.</li> Denatured alcohol, which carries no liquor tax, should be a satisfactory substitute for ethyl alcohol for stain removing purposes.</li> </ol> </li> Filler material such as whiting, diatomaceous earth or talc</li> <li>Mineral water</li> <li>Clean dry towels for blotting the area after treatment</li> <li>Clean, potable water</li> <li>Accessible source of water, soap and towels for washing and rinsing in case of emergencies associated with the use of chemicals</li> </ol>

EQUIPMENT
<ol type="A"> <li>Glass or ceramic container for mixing the solution</li> <li>Wooden utensil for stirring the ingredients</li> <li>Wood or plastic spatula</li> </ol> =EXECUTION=

PREPARATION
<ol type="A"> <li>Protection: <ol> <li>Provide adequate wash solutions (i.e. water, soap and towels) before starting the job.</li> <li>Whenever acid is used, the surface should be thoroughly rinsed with water as soon as its action has been adequate. Otherwise it will continue etching the concrete even though the stain is gone.</li> </ol> </li> </ol>

ERECTION, INSTALLATION, APPLICATION
<ol type="A">

<li>Mix whiting material from Section 2.01 with denatured alcohol to create a thick paste. Select the amount of whiting or filler material to make a poultice of the required size. Add denatured alcohol to obtain the proper paste-like consistency.</li> <li>Thoroughly wet the concrete surface to be treated with clean, clear water.</li> <li>Apply the poultice to the stained area using a wood or plastic spatula and allow to dry. Be sure to spread the poultice well beyond the stained area. The liquid portion of the paste will migrates into the concrete where it will dissolve some of the staining material. Then the liquid will gradually move back beyond the concrete surface and into the poultice, where it will evaporate, leaving the dissolved staining material in the poultice.</li> <li>When the poultice has dried, brush or scrape it off with a wooden scraper.</li> <li>Thoroughly rinse the area with clean, clear water and allow to dry.</li> <li>Repeat the process as necessary to sufficiently remove the stain.</li> </ol>