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 1-5 of 5
Page 8
... 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 ... Dolomite . + 50 % Dolomite . + 60 % Dolomite + 35 % Fly ...
... 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 ... Dolomite . + 50 % Dolomite . + 60 % Dolomite + 35 % Fly ...
Page 9
... 25 % Cracked Coating description 50 % Cracked Initial Spall 25 % Spalled 50 % Spalled Months Ratio Months Ratio Months Ratio California Asphalt . + 35 % BBS . + 50 % BBS . + 60 % BBS + 35 % Clay . + 50 % Clay . + 35 % Dolomite . 10 1.0 ...
... 25 % Cracked Coating description 50 % Cracked Initial Spall 25 % Spalled 50 % Spalled Months Ratio Months Ratio Months Ratio California Asphalt . + 35 % BBS . + 50 % BBS . + 60 % BBS + 35 % Clay . + 50 % Clay . + 35 % Dolomite . 10 1.0 ...
Page 10
... dolomite , and silica on the durability of the smooth - surface specimens were more variable than those of blue ... ( 25 percent coating spalled ) as much as 80 percent . In all instances it increased the durability by at least 10 ...
... dolomite , and silica on the durability of the smooth - surface specimens were more variable than those of blue ... ( 25 percent coating spalled ) as much as 80 percent . In all instances it increased the durability by at least 10 ...
Page 13
... Dolomite 25 50 % Blue Black Slate 25 100 % Asphalt 35 % Dolomite 25 35 % Blue Black Slate 25 60 % Blue Black Slate 35 % Dolomite 25 35 % Blue Black Slate 25 60 % Blue Black Slate NNNAS 45 45 25 25 25 7. Conclusions 8. References ( cut ...
... Dolomite 25 50 % Blue Black Slate 25 100 % Asphalt 35 % Dolomite 25 35 % Blue Black Slate 25 60 % Blue Black Slate 35 % Dolomite 25 35 % Blue Black Slate 25 60 % Blue Black Slate NNNAS 45 45 25 25 25 7. Conclusions 8. References ( cut ...
Page 14
... 35 % BBS 50 % BBS 60 % BBS 35 % CLAY 50 % CLAY 35 % DOL . 50 % DOL 60 % DOL 35 % F.A. 300 MID - CONTINENT DURABILITY ... 25 - mil thick coatings were more durable than the 15 - mil coatings of the same mixes , but in many instances ...
... 35 % BBS 50 % BBS 60 % BBS 35 % CLAY 50 % CLAY 35 % DOL . 50 % DOL 60 % DOL 35 % F.A. 300 MID - CONTINENT DURABILITY ... 25 - mil thick coatings were more durable than the 15 - mil coatings of the same mixes , but in many instances ...
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