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
Page 7
... granules in most of the specimens and heavier losses of granules in the few specimens in which poor granule adhesion was measured prior to exposure . After about 12 years of exposure , cracks began to appear in the coatings . About a ...
... granules in most of the specimens and heavier losses of granules in the few specimens in which poor granule adhesion was measured prior to exposure . After about 12 years of exposure , cracks began to appear in the coatings . About a ...
Page 10
... granules early during their exposure . The California specimens containing clay passed the test marginally . They , also , lost some granules early during exposure . However , none of these specimens has failed by the established ...
... granules early during their exposure . The California specimens containing clay passed the test marginally . They , also , lost some granules early during exposure . However , none of these specimens has failed by the established ...
Page 11
... 60 % Blue Black Slate 25 35 % Fly Ash 25 50 % Fly Ash 25 60 % Blue Black Slate 25 35 % Fly Ash 25 50 % Fly Ash 25 1 Mid - Continent Asphalt . 2 Tabs partially torn off . 1000 21 G FOA CA5216 CABRIO CAP320 FIGURE 4. Granule. 11.
... 60 % Blue Black Slate 25 35 % Fly Ash 25 50 % Fly Ash 25 60 % Blue Black Slate 25 35 % Fly Ash 25 50 % Fly Ash 25 1 Mid - Continent Asphalt . 2 Tabs partially torn off . 1000 21 G FOA CA5216 CABRIO CAP320 FIGURE 4. Granule. 11.
Page 12
Sidney H. Greenfeld. 1000 21 G FOA CA5216 CABRIO CAP320 FIGURE 4. Granule - surfaced , felt - base Venezuela specimens after 15 years of exposure ( Initial granule coverage approximately 25 lb / 100 sq ft ( 1.22 kg / m 2 ) ) Column 1 ...
Sidney H. Greenfeld. 1000 21 G FOA CA5216 CABRIO CAP320 FIGURE 4. Granule - surfaced , felt - base Venezuela specimens after 15 years of exposure ( Initial granule coverage approximately 25 lb / 100 sq ft ( 1.22 kg / m 2 ) ) Column 1 ...
Page 13
Sidney H. Greenfeld. FVA5409 ZA 7296 VABRIG EVA5229 FIGURE 5. Granule - surfaced , felt - base California specimens after 15 years of exposure ( Initial granule coverage approximately 25 lb / 100 sq ft ( 1.22 kg / m 2 ) ) Column 1 Column ...
Sidney H. Greenfeld. FVA5409 ZA 7296 VABRIG EVA5229 FIGURE 5. Granule - surfaced , felt - base California specimens after 15 years of exposure ( Initial granule coverage approximately 25 lb / 100 sq ft ( 1.22 kg / m 2 ) ) Column 1 Column ...
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