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
... felt - base specimens . Granule - surfaced specimens .. Back - coater ... Aluminum - base panels . 2.3 . Materials .. a . Mineral matter .. b . Asphalts . 3 . C. Saturated felts . d . Aluminum panels . e . Granules 2.4 . Specimen ...
... felt - base specimens . Granule - surfaced specimens .. Back - coater ... Aluminum - base panels . 2.3 . Materials .. a . Mineral matter .. b . Asphalts . 3 . C. Saturated felts . d . Aluminum panels . e . Granules 2.4 . Specimen ...
Page 4
... Saturated Felts The dry felt was prepared for this project in rolls 121⁄2 in wide by 300 ft long and shipped by one of the sponsoring companies to another of the spon- sors for saturation by personnel on the project . The dry and saturated ...
... Saturated Felts The dry felt was prepared for this project in rolls 121⁄2 in wide by 300 ft long and shipped by one of the sponsoring companies to another of the spon- sors for saturation by personnel on the project . The dry and saturated ...
Page 5
... felt 5 g ker / g felt : Saturated felt 53 ± 2 1.90 0.01 57 ± 3 31 6.8 Saturation Percent of felt weight 1 Burette method ARIB No. 2.125 , April 1954 . 21 lb = 0.45 kg ( approx ) . d . Aluminum Panels 177 183 187 Percent of kerosene ...
... felt 5 g ker / g felt : Saturated felt 53 ± 2 1.90 0.01 57 ± 3 31 6.8 Saturation Percent of felt weight 1 Burette method ARIB No. 2.125 , April 1954 . 21 lb = 0.45 kg ( approx ) . d . Aluminum Panels 177 183 187 Percent of kerosene ...
Page 6
... felt panel was fastened with masking tape to the Kraft paper on the hot plate . About one and a half times the ... saturated felt to be degraded rapidly by the weather . Photo- oxidation rapidly destroyed the saturant and per- mitted ...
... felt panel was fastened with masking tape to the Kraft paper on the hot plate . About one and a half times the ... saturated felt to be degraded rapidly by the weather . Photo- oxidation rapidly destroyed the saturant and per- mitted ...
Page 7
... saturated felts , just as in the smooth- surface , felt - base specimens . The granules protect the coating from solar radiation and greatly delay the later stages of deterioration . 3.3 . Blistering Early in the exposure of the smooth ...
... saturated felts , just as in the smooth- surface , felt - base specimens . The granules protect the coating from solar radiation and greatly delay the later stages of deterioration . 3.3 . Blistering Early in the exposure of the smooth ...
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