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 1
... instances , the current production is no longer strictly comparable to that being observed . Therefore , it has long been the practice to design rapid methods for evaluating materials and simul- taneously exposing the same materials to ...
... instances , the current production is no longer strictly comparable to that being observed . Therefore , it has long been the practice to design rapid methods for evaluating materials and simul- taneously exposing the same materials to ...
Page 8
... instances during the first winter , but the specimens continued to perform well for many years . There was no relationship between any of the levels of cracking and spalling . Therefore , nothing more will be said about cracking , for ...
... instances during the first winter , but the specimens continued to perform well for many years . There was no relationship between any of the levels of cracking and spalling . Therefore , nothing more will be said about cracking , for ...
Page 9
... instance were coatings containing fly ash less durable than the asphalt with which they were made . The higher concentrations again produced the best performers and the thicker films lasted longer than the corresponding thinner ones ...
... instance were coatings containing fly ash less durable than the asphalt with which they were made . The higher concentrations again produced the best performers and the thicker films lasted longer than the corresponding thinner ones ...
Page 10
... instances it increased the durability by at least 10 percent . Similarly , in the Mid - Continent asphalt it also increased the durability of the asphalt by at least 10 percent ; the 25 - mil coatings with 50 and 60 percent silica have ...
... instances it increased the durability by at least 10 percent . Similarly , in the Mid - Continent asphalt it also increased the durability of the asphalt by at least 10 percent ; the 25 - mil coatings with 50 and 60 percent silica have ...
Page 14
... instances not 40 percent more durable . Both of these conditions were also apparent in the results of the weatherometer tests . After 16 and a half years of exposure of smooth- surface and granule - surfaced roofing in Washington , D.C. ...
... instances not 40 percent more durable . Both of these conditions were also apparent in the results of the weatherometer tests . After 16 and a half years of exposure of smooth- surface and granule - surfaced roofing in Washington , D.C. ...
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