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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Results 1-5 of 11
Page 1
... mils , 3 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 to ...
... mils , 3 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 to ...
Page 3
... Mils μM 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 97.5 91.0 80.8 5.86 149 100 96.2 99.8 99.3 96.7 85.6 53.7 4.92 125 120 91.3 99.6 96.6 94.2 65.9 15.3 3.47 88 170 ...
... Mils μM 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 97.5 91.0 80.8 5.86 149 100 96.2 99.8 99.3 96.7 85.6 53.7 4.92 125 120 91.3 99.6 96.6 94.2 65.9 15.3 3.47 88 170 ...
Page 5
... mils : Tensile , lb / in Ash , % : California asphalt . Mid - Continent asphalt . Venezuela asphalt .. Dry felt 20 Rags Paper Asplund 20 35 40 Scrap felt 5 g ker / g felt : Saturated felt 53 ± 2 1.90 0.01 57 ± 3 31 6.8 Saturation ...
... mils : Tensile , lb / in Ash , % : California asphalt . Mid - Continent asphalt . Venezuela asphalt .. Dry felt 20 Rags Paper Asplund 20 35 40 Scrap felt 5 g ker / g felt : Saturated felt 53 ± 2 1.90 0.01 57 ± 3 31 6.8 Saturation ...
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
15 cents 60 percent silica aluminum-base specimens ARIB ASTM method automatic data processing back-coated Black Slate 25 blistering Blue Black Slate Building Science Series Bureau of Standards California asphalt Cement and Concrete Coating composition Thickness Coating thickness Composition Column 1 Column Composition Coating thickness Concrete Properties cracking and spalling doctor bar Dolomite 25 35 embedding rolls felt-base specimens Fly Ash 25 Fly Ash 50 granule-surfaced specimens Greenfeld increased the durability Institute for Applied Interrelations Between Cement Isopropyl alcohol Kraft paper Lake Erie Loss on ignition losses of granules Mica Mid-Continent asphalt mineral additives months of exposure Months Ratio Months National Bureau outdoor exposures performances Portland Cement Ratio Months Ratio saturated felt shingle smooth-surface specimens specimens after 15 specimens exposed outdoors Stabilized Asphalt Coatings straight asphalt surface specimens tabs thickness Composition Coating thickness mils mils three asphalts type of specimen U.S. Government Printing Venezuela asphalt Viscosity weatherometer tests