Specification:Treating dusting of concrete floors

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=GENERAL=

SUMMARY
 This procedure includes guidance on treating dusting of concrete floors. Dusting is a problem evident as a powdered material that develops at the surface of hardened concrete. The treatment described in this procedure includes mopping with a fluosilicate and water mixture.  Fluosilicate makes the concrete surface harder and more impermeable. This treatment also improves the concrete surface for the application of oil base paints and varnishes.   Safety Precautions:  DO NOT save unused portions of stain-removal materials. DO NOT store any chemicals in unmarked containers.</li> EXCELLENT VENTILATION MUST BE PROVIDED WHEREVER ANY SOLVENT IS USED. USE RESPIRATORS WITH SOLVENT FILTERS.</li> No use of organic solvents indoors should be allowed without substantial air movement. Use only spark-proof fans near operations involving flammable liquids.</li> Provide adequate clothing and protective gear where the chemicals are indicated to be dangerous.</li> 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:  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> </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).

=PRODUCTS=

MATERIALS
<ol type="A">

Fluosilicate:  <li>Magnesium Fluosilicate: <li>Other chemical or common names include Magnesium silicofluoride.</li> <li>Potential Hazards: TOXIC.</li> <li>Available from construction specialties distributor (often sold under manufacturer's brand name; the chemical name may appear on the label).</li> </ol> </li> <li>Zinc Fluosilicate: <li>Other chemical or common names include Zinc silicofluoride.</li> <li>Available from construction services distributor (often sold under a manufacturer's brand name; the chemical name may appear on the label).</li> </ol> </li> </ol> </li> <li>Clean, potable water</li> </ol>

EQUIPMENT
<ol type="A"> <li>Garden hose and pneumatic spray nozzle</li> <li>Stiff bristle brushes (non-metallic)</li> <li>Mopping Tools: <ol> <li>Wet mop</li> <li>Mop bucket</li> <li>Wringer</li> <li>Sponge mop and squeegee</li> </ol> </li> </ol> =EXECUTION=

PREPARATION
<ol type="A"> <li>Protection: Provide adequate wash solutions (i.e. water, soap and towels) before starting the job.</li> </ol>

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

<li>Make sure the floor is clean before you begin.</li> <li>Mix 1 pound of fluosilicate (a mixture of 20% zinc fluosilicate and 80% magnesium fluosilicate) with 1 gallon of water.</li> <li>Mop the mixture generously on the concrete surface and allow to dry.</li> <li>If additional coats are necessary, mix 2 pounds of fluosilicate (20/80 as in 3.02 B. above) in 1 gallon of water and apply as in 3.02 C. above. Two or three coats may be necessary.</li> <li>When the last coat has dried, thoroughly rinse the surface with clean, clear water and scrub with a stiff bristle brush to remove any crystals that have formed.</li> </ol>