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). |
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Page 1
... 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 ...
... 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 ...
Page 2
... mica , and Lake Erie silica . The properties of these materials are listed in table 1 . b . Asphalts The descriptions and properties of the three asphalts used in this investigation were reported previously [ 3 ] and are tabulated in ...
... mica , and Lake Erie silica . The properties of these materials are listed in table 1 . b . Asphalts The descriptions and properties of the three asphalts used in this investigation were reported previously [ 3 ] and are tabulated in ...
Page 3
... Mica Lake Erie Silica # 50 - Quarry Delta , Pa . Mine Edgar , Fla . Quarry Joliet , Ill . Philadelphia Electric Co. # 160 - Pit Mine Johnson City , Dredged Lake Erie Tenn . 56 47 6 40 50 98+ 32 38 1 48 35 49 2.5 1 4 10 0.5 2 7.6 ...
... Mica Lake Erie Silica # 50 - Quarry Delta , Pa . Mine Edgar , Fla . Quarry Joliet , Ill . Philadelphia Electric Co. # 160 - Pit Mine Johnson City , Dredged Lake Erie Tenn . 56 47 6 40 50 98+ 32 38 1 48 35 49 2.5 1 4 10 0.5 2 7.6 ...
Page 5
... mica while still warm . Upon cooling , each specimen was cut to 7 X 11 in and exposed the next day on wooden roof decks , which had been covered with smooth - surface roll roofing ( facing due south and at an angle of 45 ° ) . An area ...
... mica while still warm . Upon cooling , each specimen was cut to 7 X 11 in and exposed the next day on wooden roof decks , which had been covered with smooth - surface roll roofing ( facing due south and at an angle of 45 ° ) . An area ...
Page 7
... mica - stabilized coatings out performed all the others ; only one coating had deteriorated to any of the selected levels in tables 6 and 7 in 200 months . The 15 - mil California coating with 35 percent mica exhibited its first spalled ...
... mica - stabilized coatings out performed all the others ; only one coating had deteriorated to any of the selected levels in tables 6 and 7 in 200 months . The 15 - mil California coating with 35 percent mica exhibited its first spalled ...
Common terms and phrases
60 percent aluminum aluminum-base specimens appearance Applied areas asphalt coatings ASTM base Black Slate 25 blistering Blue Black Slate Building Building Science Series Bureau of Standards California asphalt Cement Center cents Characteristics Clay Column COMMERCE concentrations consists containing corresponding cracking criteria deterioration differences direction divisions doctor bar Dolomite durability early effects exposed exposure failed failure felt-base specimens FIGURE Fly Ash Government granule-surfaced specimens granules grid half heated industry Institute Kraft paper listed longer Loss on ignition losses machine materials measurement method Mica Mid-Continent asphalt mils mineral additives Months Ratio Months National Bureau observed Office Organic panel passed performances period physical prepared procedure produced Properties provides Ratio Months Ratio reference reported Research rolls roofing saturated felt sheets shingle Silica smooth smooth-surface smooth-surface specimens spalling surface TABLE technical Technology temperature tests three asphalts Venezuela asphalt Washington weather weatherometer tests