CoatingsPro Magazine

MAY 2015

CoatingsPro offers an in-depth look at coatings based on case studies, successful business operation, new products, industry news, and the safe and profitable use of coatings and equipment.

Issue link: https://coatingspromag.epubxp.com/i/504582

Contents of this Issue

Navigation

Page 37 of 92

COATINGSPRO MAY 2015 37 Te results from these tests are as diferent as the tests themselves. ASTM F1869-11 measures the amount of moisture vapor emitted from the surface of the concrete slab. Te results for this test are given as pounds per 1,000 square feet (93 m²) per 24 hour period. Te results are not a percentage of moisture in the concrete slab. ASTM F2170-11 measures the amount of relative humidity contained within the concrete slab. Te results for this test are given as a percentage of moisture vapor. Tese results are not a percentage of moisture contained within the slab. ASTM F2420-05 measures the amount of relative humidity at the surface of the concrete slab. Te results for this test are given as a percentage of moisture vapor. Tese results are not a percentage of moisture contained within the slab. ASTM D4263-83 indicates the presence of moisture on or within the surface of the concrete slab. Te results of this test are purely qualitative. Tese results cannot give a percentage of moisture contained within the slab. ASTM F2659-10 measures moisture on or in the top portion of the concrete slab. Tis test should be used in conjunction with F1869, F2170, or F2420. Te results from these meters should not be viewed as quantitative. To achieve proper results with any of these tests, environmental condi- tions need to be stabilized to normal building operation conditions for 24 hours prior to and for the duration of the tests. An uncontrolled environment will result in false readings, which will render the tests inefective. Additionally, surface preparation needs to be done prior to performing any of these tests. A ll sealers or surface contaminants need to be properly removed. Surface preparation should be done to an area approximately four square feet (0.4 m²). Tis will ensure concrete can breathe around the test area and prevent false readings from the funnel efect. It is important to note that patching materials may create a vapor barrier. Do not perform any tests over top of patched locations or within four feet (1.2 m) of the edge of the concrete slab or joint. Concrete Floor Survey Concrete f loor sur veys need to be performed. A proper sur vey w ill include inspection of joints, cracks, and hardness of concrete. Concrete defects, such as alkali silica reaction Inspector's Corner Wr i te in Re ad e r In q u ir y #365

Articles in this issue

Archives of this issue

view archives of CoatingsPro Magazine - MAY 2015