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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... . Granule - surfaced , felt - base specimens . 10 6 . Correlation with exposures in accelerated weathering machine . 10 7 . Conclusions ... 8 . References 43 14 15 Natural Weathering of Mineral Stabilized Asphalt Coatings on Organic Felt.
... . Granule - surfaced , felt - base specimens . 10 6 . Correlation with exposures in accelerated weathering machine . 10 7 . Conclusions ... 8 . References 43 14 15 Natural Weathering of Mineral Stabilized Asphalt Coatings on Organic Felt.
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... references at the end of this paper . 2. Experimental Details 2.1 . Types of Specimens Three types of specimens were included in this study . The basic specimen was a smooth - surface coated felt . These were exposed with coating thick ...
... references at the end of this paper . 2. Experimental Details 2.1 . Types of Specimens Three types of specimens were included in this study . The basic specimen was a smooth - surface coated felt . These were exposed with coating thick ...
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... reference [ 3 ] . 2.3 . Materials a . Mineral Matter The six minerals used in this investigation were blue black slate , Florida clay , Niagara dolomite , low - carbon fly ash , Tennessee mica , and Lake Erie silica . The properties of ...
... reference [ 3 ] . 2.3 . Materials a . Mineral Matter The six minerals used in this investigation were blue black slate , Florida clay , Niagara dolomite , low - carbon fly ash , Tennessee mica , and Lake Erie silica . The properties of ...
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... reference [ 3 ] . 2.5 . Specimen 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 ...
... reference [ 3 ] . 2.5 . Specimen 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 ...
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... reference [ 3 ] , where the results of the accelerated weathering on these coatings were discussed . ( A Spalls in 25 grid areas ( 25 % ) . 50 % Granule loss in 49 grid areas ( 50 % ) or spalls in 25 grid areas ( 25 % ) . Cracks in 30 ...
... reference [ 3 ] , where the results of the accelerated weathering on these coatings were discussed . ( A Spalls in 25 grid areas ( 25 % ) . 50 % Granule loss in 49 grid areas ( 50 % ) or spalls in 25 grid areas ( 25 % ) . Cracks in 30 ...
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