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 5
... half full of asphalt . The temperatures of both the asphalt under investigation and the asphalt in the bath were watched constantly to prevent any overheating . When the temperature of the test asphalt was in the range of 400 to 450 ° F ...
... half full of asphalt . The temperatures of both the asphalt under investigation and the asphalt in the bath were watched constantly to prevent any overheating . When the temperature of the test asphalt was in the range of 400 to 450 ° F ...
Page 6
... half times the required coating was distributed over the panel . The motor was started and the panel was pulled under the doctor bar ( B ) and granule hopper ( C ) ; then the motor was stopped for 2 min to permit the panel to cool and ...
... half times the required coating was distributed over the panel . The motor was started and the panel was pulled under the doctor bar ( B ) and granule hopper ( C ) ; then the motor was stopped for 2 min to permit the panel to cool and ...
Page 7
... half years . No spalling of the coatings has been observed in any of these specimens since their exposure in 1952. How- ever , in the normal course of events , as weathering progresses , generally more granules will be lost , more ...
... half years . No spalling of the coatings has been observed in any of these specimens since their exposure in 1952. How- ever , in the normal course of events , as weathering progresses , generally more granules will be lost , more ...
Page 14
... half as durable . Thus , where the results of the weatherometer tests have not corresponded with those obtained with the exposure outdoors , they have been on the conservative side . The 25 - mil thick coatings were more durable than ...
... half as durable . Thus , where the results of the weatherometer tests have not corresponded with those obtained with the exposure outdoors , they have been on the conservative side . The 25 - mil thick coatings were more durable than ...
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