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Test Method for Indicating Moisture
in Concrete
Materials
Transparent polyethylene sheet, commercially available, 18" x 18",
minimum 10 mils thick, tape edges.
Duct tape, good quality that will adhere to the substrate, 2 in. wide is suggested.
Click here to
see demonstration photo
Optional test materials:
Flooring material to be installed, and the appropriate recommended adhesive,
18" x 18", edges must be taped (as recommended by Armstrong).
Clear Plexiglas, , 18" x 18", edges must be sealed by plumbers putty
(as recommended by Carpet Rug Institute, CRI).
NOTE: Concrete treated with MOXIE 1800 SUPER-ADMIX
produces an impermeable, non-porous and non-absorptive surface; therefore, all products
considered for the project must be applicable for use, compatibility, curing aspects and
properties for the application over an IMPERMEABLE, NON-POROUS and NON-ABSORPTIVE
surface, additionally, concrete is void of any free lime. Some patching materials, as
well as surface applied coloring agents, cannot be applied over non-absorptive surfaces or
those void of free lime. When flooring is to be installed and a "wet set"
adhesives is being used they must develop "tack" or "flash," prior to
the installation or they will not adhere properly or cure and appear to have characteristics of moisture migration. Most manufacturers require an adhesive trowel with less notch depth
and spacing when used for application over impermeable surfaces. The surface of a slab placed with MOXIE 1800 SUPER-ADMIX will not absorb any
of the liquid carrier from the adhesive.
Ambient temperature must be AT LEAST 700 F,
OR 150 F GREATER THAN THE SLAB TEMPERATURE, FOR A MINIMUM OF 30 DAYS PRIOR TO
THE COMMENCEMENT OF TESTING. Any parting or curing compound must be removed a minimum
of 30 days prior to testing as well. Any other conditions must be within the established
parameters, as recommended by the manufacturer, for application of the coating, paint,
surface treatment, or flooring system and adhesives. Protect test areas from direct
sunlight and damage; reliability of test results will be affected. Clear membrane may be
protected by covering with a protective cover such as cardboard, carpet, or rubber mat.
Water to cement ratios greater than .54, or more, and curing or parting compounds will
dramatically delay the proper hydration of the slab and chemical reaction of MOXIE 1800
SUPER-ADMIX. Refer to the MOXIE International publications, "Moisture Migration Table
& Graphs". A visqueen vapor barrier will further delay the hydration process for
several months.
Procedure
Tape a segment of clear visqueen membrane, approximately 18" x 18", tightly
to the concrete surface making sure that all edges are sealed. Allow plastic sheet to
remain in place a minimum of 72 hours, 7 days is preferred. Test areas may be left in
place for one week or longer depending on time constraints. The use of a heat lamp is
recommended to force moisture movement. After the allowed time has elapsed, visually
inspect the clear membrane or Plexiglas, and note the presence, if any, of visible
moisture or condensation. A dew point hygrometer may also be used for quantitative
results. Do not confuse a clean area for a damp area. Duct tape will remove surface
dusting and appear lighter, making the area under the membrane appear darker by
comparison. Upon removal, there should be no visible condensation, dampness, discoloration
or an odor of dampness from the slab under the test membrane areas. The presence of the
membrane will protect that area from dust and dirt and appear darker.
Sampling:
Floors - One test area per 500 square feet (46 square meters) or portion thereof,
of surfaces unless otherwise specified.
Walls and ceilings - One test area per 500 square feet (46 square meters) or
portion thereof, of surface area unless otherwise specified. The recommended practice is a
minimum of one test for each 10 feet (3 meters) of vertical rise in all elevation starting
within 12 in. (300 mm) of the floor.
Form Requirements
The general contractor, foreman, or technician on the project must certify results and
initial EACH space provided for each test membrane. Original forms must be
forwarded to MOXIE International. Hash marks are acceptable for repetitive results.
Temperature and humidity MUST be recorded.
Certifying Signature __________________________________ Date
______________
Name ____________________________ Company ___________________________
Test Method for Indicating Moisture in Concrete
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* temperature |
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* humidity |
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MAT NUMBER |
DATE PLACED |
TIME |
DATE REMOVED |
TIME |
VISIBLE MOISTURE |
INITIALED BY |
REMARKS/NOTES |
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Test Method for Indicating Moisture in Concrete (cont.)
Page __ of ___
MAT NUMBER |
DATE PLACED |
TIME |
DATE REMOVED |
TIME |
VISIBLE MOISTURE |
INITIALED BY |
REMARKS/NOTES |
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Test Method for Indicating Moisture in Concrete (cont.)
Page __ of ___
MAT
NUMBER |
DATE PLACED |
TIME |
DATE REMOVED |
TIME |
VISIBLE MOISTURE |
INITIALED BY |
REMARKS/NOTES |
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