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 2
... Heated bed for keeping felts warm while asphalt coating is poured on them . B. Doctor bar for leveling and defining coating thickness . C. Granule hopper and distributor . D. Granule placement S - rolls . F. Granule pressing , or ...
... Heated bed for keeping felts warm while asphalt coating is poured on them . B. Doctor bar for leveling and defining coating thickness . C. Granule hopper and distributor . D. Granule placement S - rolls . F. Granule pressing , or ...
Page 5
... heated in an air oven at 300 ° F ( 149 ° C ) to warm them and to eliminate moisture . They were ready for use when the saturant , which came to the surface as the felts were heated , was completely reabsorbed . When the felts and ...
... heated in an air oven at 300 ° F ( 149 ° C ) to warm them and to eliminate moisture . They were ready for use when the saturant , which came to the surface as the felts were heated , was completely reabsorbed . When the felts and ...
Page 6
... heated to about 250 ° F ( 121 ° C ) and the doctor bar ( B ) to 450 ° F ( 232 ° C ) . The canvas belt was threaded through the machine and a sheet of 12 - in wide Kraft paper three feet long was fastened to its end , about 4 in in front ...
... heated to about 250 ° F ( 121 ° C ) and the doctor bar ( B ) to 450 ° F ( 232 ° C ) . The canvas belt was threaded through the machine and a sheet of 12 - in wide Kraft paper three feet long was fastened to its end , about 4 in in front ...
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