Natural Weathering of Mineral Stabilized Asphalt Coatings on Organic FeltU.S. National Bureau of Standards, 1969 - 15 pages Sixteen years of outdoor weathering of laboratory-prepared smooth-surface and mineral-surfaced, felt-base roofing specimens has provided information on the effects of mineral additives on the durability of coating-grade roofing asphalts. Six finely divided mineral additives (blue black slate, clay, dolomite, fly ash, mica, and silica) were evaluated at concentrations up to 60 percent in California, Mid Continent and Venezuela asphalts. The mineral-surfaced specimens are all performing satisfactorily, and show only minor degrees of degradation. Of the smooth-surfaced specimens, the Mid-Continent asphalt performed the best and the California asphalt the poorest. The mica and blue black slate increased the durabilities of all three asphalts at all concentrations and two coating thicknesses. Fly ash, clay, dolomite, and silica were beneficial in some combinations, but had little effect in others. In general, these early results from outdoor exposure tend to corroborate the results obtained on these coatings exposed in weatherometers. (Author). |
From inside the book
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Page 1
... asphalt systems included in this study consisted of three asphalts and six mineral additives at three concentrations on one grade of shingle felt . The coatings were applied in two film thicknesses , and were exposed unsurfaced and ...
... asphalt systems included in this study consisted of three asphalts and six mineral additives at three concentrations on one grade of shingle felt . The coatings were applied in two film thicknesses , and were exposed unsurfaced and ...
Page 2
... Asphalts The descriptions and properties of the three asphalts used in this investigation were reported previously [ 3 ] and are tabulated in table 2 . B C D E Specific gravity 2 . Surface area Oil absorption . Water. 2.
... Asphalts The descriptions and properties of the three asphalts used in this investigation were reported previously [ 3 ] and are tabulated in table 2 . B C D E Specific gravity 2 . Surface area Oil absorption . Water. 2.
Page 6
... three feet long was fastened to its end , about 4 in in front of the doctor bar . In order to be assured that the doctor bar was at the proper distance from the machine bed , a blank run was made in which no granules were used . When ...
... three feet long was fastened to its end , about 4 in in front of the doctor bar . In order to be assured that the doctor bar was at the proper distance from the machine bed , a blank run was made in which no granules were used . When ...
Page 7
... asphalt , blisters appeared well within the areas inspected . Only a very few specimens made with California asphalt had any blisters ; none had more than three . While blistering contributes to poor appearance , it does not interfere ...
... asphalt , blisters appeared well within the areas inspected . Only a very few specimens made with California asphalt had any blisters ; none had more than three . While blistering contributes to poor appearance , it does not interfere ...
Page 9
... [ 3 ] . The other additives used tended to have blocky to spherical shapes ; their performances were varied . in the three asphalts . Fly ash was the next best performer in that it increased the durability of some coatings as much as 170 ...
... [ 3 ] . The other additives used tended to have blocky to spherical shapes ; their performances were varied . in the three asphalts . Fly ash was the next best performer in that it increased the durability of some coatings as much as 170 ...
Common terms and phrases
15 cents 60 percent silica aluminum-base specimens ARIB ASTM method automatic data processing back-coated Black Slate 25 blistering Blue Black Slate Building Science Series Bureau of Standards California asphalt Cement and Concrete Coating composition Thickness Coating thickness Composition Column 1 Column Composition Coating thickness Concrete Properties cracking and spalling doctor bar Dolomite 25 35 embedding rolls felt-base specimens Fly Ash 25 Fly Ash 50 granule-surfaced specimens Greenfeld increased the durability Institute for Applied Interrelations Between Cement Isopropyl alcohol Kraft paper Lake Erie Loss on ignition losses of granules Mica Mid-Continent asphalt mineral additives months of exposure Months Ratio Months National Bureau outdoor exposures performances Portland Cement Ratio Months Ratio saturated felt shingle smooth-surface specimens specimens after 15 specimens exposed outdoors Stabilized Asphalt Coatings straight asphalt surface specimens tabs thickness Composition Coating thickness mils mils three asphalts type of specimen U.S. Government Printing Venezuela asphalt Viscosity weatherometer tests