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
... mils , were back - coated with the same coating blend , and were dusted with mica retained on a No. 100 sieve . $ 1 Mil = 0.025 mm ( approx ) . The first type of specimen was made on 9 - X 12 - in1 felts and trimmed to 7 X 11 in prior ...
... mils , were back - coated with the same coating blend , and were dusted with mica retained on a No. 100 sieve . $ 1 Mil = 0.025 mm ( approx ) . The first type of specimen was made on 9 - X 12 - in1 felts and trimmed to 7 X 11 in prior ...
Page 3
... Mils ММ U.S. Sieve No. 99.8 100.0 99.9 99.6 100.0 99.9 9.84 250 60 99.3 99.9 99.9 98.9 96.0 98.2 6.97 177 80 97.9 99.8 99.6 5.86 97.5 91.0 80.8 149 100 96.2 99.8 99.3 96.7 85.6 53.7 4.92 125 120 91.3 99.6 3.47 88 96.6 94.2 65.9 15.3 170 ...
... Mils ММ U.S. Sieve No. 99.8 100.0 99.9 99.6 100.0 99.9 9.84 250 60 99.3 99.9 99.9 98.9 96.0 98.2 6.97 177 80 97.9 99.8 99.6 5.86 97.5 91.0 80.8 149 100 96.2 99.8 99.3 96.7 85.6 53.7 4.92 125 120 91.3 99.6 3.47 88 96.6 94.2 65.9 15.3 170 ...
Page 5
... mils : Tensile , lb / in Ash , % : California asphalt . Mid - Continent asphalt . Venezuela asphalt Dry felt Rags Paper Asplund Scrap felt g ker / g felt : Saturated felt 2305 40 53 ± 2 1.900.01 57 ± 3 31 6.8 Saturation Percent of felt ...
... mils : Tensile , lb / in Ash , % : California asphalt . Mid - Continent asphalt . Venezuela asphalt Dry felt Rags Paper Asplund Scrap felt g ker / g felt : Saturated felt 2305 40 53 ± 2 1.900.01 57 ± 3 31 6.8 Saturation Percent of felt ...
Page 7
... Mil ( 0.38. oxidation rapidly destroyed the saturant and per- mitted water to enter the felts and , through alternate ... mils thick ( table 7 ) had not reached some of the levels of deterioration reported . This condition is indicated by ...
... Mil ( 0.38. oxidation rapidly destroyed the saturant and per- mitted water to enter the felts and , through alternate ... mils thick ( table 7 ) had not reached some of the levels of deterioration reported . This condition is indicated by ...
Page 8
Sidney H. Greenfeld. TABLE 6. Smooth surface specimens 1 15 Mil ( 0.38 mm ) Thickness Specimens have not progressed to this failure level after 200 months of exposure . T Tab torn off . TABLE 7. Smooth surface specimens 1 25 Mil ( 0.64.
Sidney H. Greenfeld. TABLE 6. Smooth surface specimens 1 15 Mil ( 0.38 mm ) Thickness Specimens have not progressed to this failure level after 200 months of exposure . T Tab torn off . TABLE 7. Smooth surface specimens 1 25 Mil ( 0.64.
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