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Historic Preservation - Technical Procedures

Spectitle:

Poulticing Iodine Stains From Concrete

Procedure code:

0371025R

Source:

Hstrc Concrete: Investigation & Rpr/Pre-Conf Training - 1989

Division:

Concrete

Section:

Concrete Cleaning

Last Modified:

02/24/2012

Details:

Poulticing Iodine Stains From Concrete



POULTICING IODINE STAINS FROM CONCRE= TE


THE CLEANING OR REMOVAL OF STAINS FROM CONCRETE MAY INVOLVE THE
USE OF LIQUIDS, DETERGENTS OR SOLVENTS WHICH MAY RUN OFF ON
ADJACENT MATERIAL, DISCOLOR THE CONCRETE OR DRIVE THE STAINS DEEPER
INTO THE POROUS CONCRETE.  USE THE PRODUCTS AND TECHNIQUES
DESCRIBED HERE ONLY FOR THE COMBINATIONS OF DIRT/STAIN AND
CONCRETE SPECIFIED.


PART 1---GENERAL

1.01 SUMMARY

    A.   This procedure includes guidance on removing iodin= e
         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.

    B.   Safety Precautions:

         1.   DO NOT save unused portions of stain-removal
              materials.

         2.   DO NOT store any chemicals in unmarked containers.

         3.   EXCELLENT VENTILATION MUST BE PROVIDED WHEREVER ANY
              SOLVENT IS USED.  USE RESPIRATORS WITH SOLVENT
              FILTERS.

         4.   No use of organic solvents indoors should be
              allowed without substanti= al air movement.  Use only
              spark-proof fans near operations involving
              flammable liquids.

         5.   Provide adequate clothing and protective gear where
              the chemicals are indicat= ed to be dangerous.

         6.   Have available antidote and accident treatment
                             chemicals where noted.=0C     C.   See 01100-07-S for general project guidelines to be
         reviewed along with this procedure.  These guidelines
         cover the following sections:

         1.   Safety Precautions

         2.   Historic Structures Precaution= s

         3.   Submittals

         4.   Quality Assurance

         5.   Delivery, Storage and Handling=

         6.   Project/Site Conditions

         7.   Sequencing and Scheduling

         8.   General Protection (Surface and Surrounding)

         These guidelines should be reviewed prior to performing
         this procedure and should be followed, when applicable,
         along with recommendations from the Regional Historic
         Preservation Officer (RHPO).

    D.   For additional information on poulticing, see 04455-02-R.


PART 2---PRODUCTS

2.01 MATERIALS

    NOTE:  Chemical products are sometimes sold under a common
    name.  This usually means that the substance is not as pure as
    the same chemical sold under its chemical name.  The grade of
    purity of common name substances, however, is usually adequa= te
    for stain removal work, and these products should be purchas= ed
    when available, as they tend to be less expensive.  Com= mon
    names are indicated below by an asterisk (*).

    A.   Denatured Alcohol:

         1.   Other chemical or common names include Methylated
              spirit*.

         2.   Potential hazards:  TOXIC AND FLAMMABLE.

         3.   Available from hardware store, paint store or
              printer's supply distribu= tor.

         4.   Denatured alcohol, which carri= es no liquor tax,
              should be a satisfactory substitute for ethyl
              alcohol for stain removing purposes.

    B.   Filler material such as whiting, diatomaceous earth or
         talc

    C.   Mineral water

    D.   Clean dry towels for blotting the area after treat= ment

    E.   Clean, potable water

    F.   Accessible source of water, soap and towels for washing
         and rinsing in case of emergencies assoc= iated with the
         use of chemicals

2.02 EQUIPMENT

    A.   Glass or ceramic container for mixing the solution=

    B.   Wooden utensil for stirring the ingredients

    C.   Wood or plastic spatula


PART 3---EXECUTION

3.01 PREPARATION

    A.   Protection:

         1.   Provide adequate wash solutions (i.e. water, soap
              and towels) before starti= ng the job.

         2.   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.

3.02 ERECTION, INSTALLATION, APPLICATION

    NOTE:  DO NOT TRY MORE THAN ONE TREATMENT ON A GIVEN AREA
    UNLESS THE CHEMICALS USED FROM PRIOR TREATMENT HAVE BEEN
    WASHED AWAY.

    A.   Mix whiting material from Section 2.01 with denatu= red
         alcohol to create a thick paste.  S= elect the amount of
         whiting or filler material to make a poultice of the
         required size.  Add denatured alcoh= ol to obtain the
         proper paste-like consistency.

    B.   Thoroughly wet the concrete surface to be treated with
         clean, clear water.

    C.   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 stain= ing 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.

    D.   When the poultice has dried, brush or scrape it off with
         a wooden scraper.  

    E.   Thoroughly rinse the area with clean, clear water and
         allow to dry.

    F.   Repeat the process as necessary to sufficiently remove
         the stain.

                         END OF SECTION