- Author
-
Fishburn, C. C.
|
Parsons, D. E.
- Title
- Tests of Cement-Water Paints and Other Waterproofings for Unit-Masonry Walls.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
-
BMS 95,
March 15, 1943,
39 p.
- Keywords
-
paints
|
walls
|
masonry
|
cements
|
tests
|
waterproofing
|
concrete blocks
|
permeability
|
durability
|
sand
- Abstract
- One hundred thirty-one small highly permeable masonry wall specimens built of concrete blocks or of bricks were treated with cement-water paints or with other waterproofings. The effectiveness of the treatments was measured by comparing the permeability of the walls, before and after treatment, when they were subjected to conditions simulating wind-driven rain. The durability of some treatments was observed by again testing the specimens after they had been weathererd outdoors. The cement-water paints were effective waterproofings and could be applied to the best advantage on the walls of concrete blocks with stiff, rather than soft, brushes. The admixture of fine sand to the paint for the first coat applied to the coarse-textured concrete block increased the effectiveness and durability of the paints. Thick paint films resulting from the application of excessive amounts of paint were effective when first applied, but they were much less durable than thinner coatings. The permeability of the paint films of average thickness was lower after weathering than before. The colorless waterproofings were generally ineffective. Only one of the colorless waterproofings was satisfactory when first applied, but it was not durable and was much more permeable than the best cement-water paint treatments. The data confirm results previously obtained, which indicate that the only effective and durable method of waterproofing brick walls without changing their appearance was by reporting or grouting of the face joints. A series of built-in waterproof membrances was an effective waterproofing for brick walls if the leakage through the facing was drained out of the wall through weep holes at the botton. The bituminous coatings applied to the inside faces of the walls were ineffective as waterproofings.