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 6
Page 1
... exposed in weatherometers . Key words : Additive ; asphalt ; durability ; felt ; stabilizer ; weathering . 1. Introduction The most certain way to determine how a product will weather in a given geographical area is to expose the ...
... exposed in weatherometers . Key words : Additive ; asphalt ; durability ; felt ; stabilizer ; weathering . 1. Introduction The most certain way to determine how a product will weather in a given geographical area is to expose the ...
Page 5
... exposed the next day on wooden roof decks , which had been covered with smooth - surface roll roofing ( facing due south and at an angle of 45 ° ) . An area of 4 X 7 in was exposed , leaving each specimen a 3 - in head lap . Base Rock ...
... exposed the next day on wooden roof decks , which had been covered with smooth - surface roll roofing ( facing due south and at an angle of 45 ° ) . An area of 4 X 7 in was exposed , leaving each specimen a 3 - in head lap . Base Rock ...
Page 6
... exposed outdoors on the roof of the Industrial Building at the former NBS Washington site , facing due south and at an angle of 45 deg . The 7- X 11 - in specimens were mounted by nailing shingle fashion on protected decks with 4- X 7 ...
... exposed outdoors on the roof of the Industrial Building at the former NBS Washington site , facing due south and at an angle of 45 deg . The 7- X 11 - in specimens were mounted by nailing shingle fashion on protected decks with 4- X 7 ...
Page 7
... exposed to the weather . Changes observed early in the exposure period consisted of small losses of granules in most of the specimens and heavier losses of granules in the few specimens in which poor granule adhesion was measured prior ...
... exposed to the weather . Changes observed early in the exposure period consisted of small losses of granules in most of the specimens and heavier losses of granules in the few specimens in which poor granule adhesion was measured prior ...
Page 10
... exposed as granule - surfaced material , the ultimate correlation must be between the granule - surfaced specimens exposed outdoors and the specimens exposed in the accelerated weathering test . Because none of the granule - surfaced ...
... exposed as granule - surfaced material , the ultimate correlation must be between the granule - surfaced specimens exposed outdoors and the specimens exposed in the accelerated weathering test . Because none of the granule - surfaced ...
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