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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... , 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.
... , 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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... machine . C. Back - Coater The felt - base specimens were all back - coated with the apparatus shown schematically in figure 2 . d . Aluminum - Base Panels The equipment used in preparing the aluminum base specimens is described in ASTM ...
... machine . C. Back - Coater The felt - base specimens were all back - coated with the apparatus shown schematically in figure 2 . d . Aluminum - Base Panels The equipment used in preparing the aluminum base specimens is described in ASTM ...
Page 6
... machine ( fig . 1 ) was heated to about 250 ° F ( 121 ° C ) and the doctor bar ( B ) to 450 ° F ( 232 ° C ) . The canvas belt was threaded through the machine and a sheet of 12 - in wide Kraft paper three feet long was fastened to its ...
... machine ( fig . 1 ) was heated to about 250 ° F ( 121 ° C ) and the doctor bar ( B ) to 450 ° F ( 232 ° C ) . The canvas belt was threaded through the machine and a sheet of 12 - in wide Kraft paper three feet long was fastened to its ...
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... machine direction as the tem- perature changes . At the higher end of the range of temperatures encountered by roofing during expo- sure , the asphalt can accommodate the differential movements by flow , but at the lower end of the ...
... machine direction as the tem- perature changes . At the higher end of the range of temperatures encountered by roofing during expo- sure , the asphalt can accommodate the differential movements by flow , but at the lower end of the ...
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... Machine 7511 FT. 25 % Cracked Coating description 50 % Cracked Initial Spall 25 % Spalled 50 % Spalled Months Ratio Months Ratio Months Ratio Months Ratio Months Ratio California Asphalt . + 35 % BBS . + 50 % BBS . + 60 % BBS . +359 Clay ...
... Machine 7511 FT. 25 % Cracked Coating description 50 % Cracked Initial Spall 25 % Spalled 50 % Spalled Months Ratio Months Ratio Months Ratio Months Ratio Months Ratio California Asphalt . + 35 % BBS . + 50 % BBS . + 60 % BBS . +359 Clay ...
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