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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... panels . 2.3 . Materials .. a . Mineral matter .. b . Asphalts . 3 . C. Saturated felts . d . Aluminum panels . e . Granules 2.4 . Specimen preparation . a . Smooth - surface , felt - base specimens . b . Granule - surfaced , felt ...
... panels . 2.3 . Materials .. a . Mineral matter .. b . Asphalts . 3 . C. Saturated felts . d . Aluminum panels . e . Granules 2.4 . Specimen preparation . a . Smooth - surface , felt - base specimens . b . Granule - surfaced , felt ...
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... Panels The equipment used in preparing the aluminum base specimens is described in ASTM D1669 , Stand- ard Method for Preparation of Test Panels for Ac- celerated and Outdoor Weathering of Bituminous Coatings [ 1 ] and in reference [ 3 ] ...
... Panels The equipment used in preparing the aluminum base specimens is described in ASTM D1669 , Stand- ard Method for Preparation of Test Panels for Ac- celerated and Outdoor Weathering of Bituminous Coatings [ 1 ] and in reference [ 3 ] ...
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... panel was thoroughly washed and dried and its thickness measured . When the required number of acceptable panels had ... panel over the roller , picking up a thin coating . The back coating was dusted with mica while still warm . Upon ...
... panel was thoroughly washed and dried and its thickness measured . When the required number of acceptable panels had ... panel over the roller , picking up a thin coating . The back coating was dusted with mica while still warm . Upon ...
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... panel was measured . In a normal run the felt panel was fastened with masking tape to the Kraft paper on the hot plate . About one and a half times the required coating was distributed over the panel . The motor was started and the ...
... panel was measured . In a normal run the felt panel was fastened with masking tape to the Kraft paper on the hot plate . About one and a half times the required coating was distributed over the panel . The motor was started and the ...
Page 10
... panels exposed in the weather- ometers and the bars represent the average durability of two felt - base specimens exposed outdoors . Based on those specimens exposed outdoors that have failed , it is quite apparent that many of the ...
... panels exposed in the weather- ometers and the bars represent the average durability of two felt - base specimens exposed outdoors . Based on those specimens exposed outdoors that have failed , it is quite apparent that many of the ...
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