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). |
From inside the book
Results 6-10 of 13
Page 7
... exposure . After about 12 years of exposure , cracks began to appear in the coatings . About a quarter of the specimens had cracks in 5 percent of their surface areas ( five grid areas ) after 12 and a half years . No spalling of the ...
... exposure . After about 12 years of exposure , cracks began to appear in the coatings . About a quarter of the specimens had cracks in 5 percent of their surface areas ( five grid areas ) after 12 and a half years . No spalling of the ...
Page 8
... exposure . T Tab torn off . TABLE 7. Smooth surface specimens 1 25 Mil ( 0.64. 25 % Cracked Coating description 50 ... exposure of the smooth- surface specimens , all early cracking first occurred in the cross direction . These occurred ...
... exposure . T Tab torn off . TABLE 7. Smooth surface specimens 1 25 Mil ( 0.64. 25 % Cracked Coating description 50 ... exposure of the smooth- surface specimens , all early cracking first occurred in the cross direction . These occurred ...
Page 9
... Exposures Months Ratio Months Ratio - Specimens have not progressed to this failure level after 200 months of exposure . T Tab torn off . Correlation With Exposures in Accelerated Weathering Machine MAKER FMA811 FMA812. 25 % Cracked ...
... Exposures Months Ratio Months Ratio - Specimens have not progressed to this failure level after 200 months of exposure . T Tab torn off . Correlation With Exposures in Accelerated Weathering Machine MAKER FMA811 FMA812. 25 % Cracked ...
Page 10
... exposure . The test specimens are the five in each column under the identification tags , as identified in figure 3 . The variation of performance with composition and coating thickness is evident in this photograph . 5.2 . Granule ...
... exposure . The test specimens are the five in each column under the identification tags , as identified in figure 3 . The variation of performance with composition and coating thickness is evident in this photograph . 5.2 . Granule ...
Page 11
... exposure 1 Column 1 Column 2 Column 3 Coating composition Thickness Coating composition Thickness Coating composition Thickness mils mils 35 % Mica 25 60 % Fly Ash 25 60 % Fly Ash mils 25 60 % Blue Black Slate 2 15 35 % Fly Ash 2 15 50 ...
... exposure 1 Column 1 Column 2 Column 3 Coating composition Thickness Coating composition Thickness Coating composition Thickness mils mils 35 % Mica 25 60 % Fly Ash 25 60 % Fly Ash mils 25 60 % Blue Black Slate 2 15 35 % Fly Ash 2 15 50 ...
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