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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... Exposure Site and other Variables After Seven Years . 20 cents BSS5 . Interrelations Between Cement and Concrete Properties : Part 2 , Sulfate Expansion , Heat of Hydration , and Autoclave Expansion . 35 cents BSS6 . Some Properties of ...
... Exposure Site and other Variables After Seven Years . 20 cents BSS5 . Interrelations Between Cement and Concrete Properties : Part 2 , Sulfate Expansion , Heat of Hydration , and Autoclave Expansion . 35 cents BSS6 . Some Properties of ...
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... exposure ... a . Felt - base specimens . b . 2.6 . Specimen evaluation_ a . Felt - base specimens . b . Aluminum ... exposures in accelerated weathering machine . 10 7 . Conclusions ... 8 . References 43 14 15 Natural Weathering of ...
... exposure ... a . Felt - base specimens . b . 2.6 . Specimen evaluation_ a . Felt - base specimens . b . Aluminum ... exposures in accelerated weathering machine . 10 7 . Conclusions ... 8 . References 43 14 15 Natural Weathering of ...
Page 1
... exposure tend to corroborate the results obtained on these coatings exposed in weatherometers . Key words : Additive ; asphalt ; durability ; felt ; stabilizer ; weathering . 1. Introduction The most certain way to determine how a ...
... exposure tend to corroborate the results obtained on these coatings exposed in weatherometers . Key words : Additive ; asphalt ; durability ; felt ; stabilizer ; weathering . 1. Introduction The most certain way to determine how a ...
Page 5
... 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 of 4 X 7 in was exposed , leaving each specimen a 3 - in head lap . Base Rock ...
... 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 of 4 X 7 in was exposed , leaving each specimen a 3 - in head lap . Base Rock ...
Page 6
... Exposure a . Felt - Base Specimens Within 24 hr after their preparation the felt - base specimens , both smooth and granule surfaced , were exposed outdoors on the roof of the Industrial Building at the former NBS Washington site ...
... Exposure a . Felt - Base Specimens Within 24 hr after their preparation the felt - base specimens , both smooth and granule surfaced , were exposed outdoors on the roof of the Industrial Building at the former NBS Washington site ...
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