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 8
Page
... performance criteria related to the structural and enviornmental functions and the durability and safety char- acteristics of building elements and systems . These publications , similar in style and content to the NBS Building ...
... performance criteria related to the structural and enviornmental functions and the durability and safety char- acteristics of building elements and systems . These publications , similar in style and content to the NBS Building ...
Page 4
... another of the spon- sors for saturation by personnel on the project . The dry and saturated felts had the characteristics listed in table 3 . 3. Progress of Deterioration 4. Failure Criteria 5. Outdoor Performance 4.
... another of the spon- sors for saturation by personnel on the project . The dry and saturated felts had the characteristics listed in table 3 . 3. Progress of Deterioration 4. Failure Criteria 5. Outdoor Performance 4.
Page 6
... Performance TABLE 6. Smooth surface. b . Granule - Surfaced , Felt - Base Specimens The asphalt and felts were prepared as in 2.4a . The hot plate ( A ) on the laboratory roofing machine ( fig . 1 ) was heated to about 250 ° F ( 121 ° C ) ...
... Performance TABLE 6. Smooth surface. b . Granule - Surfaced , Felt - Base Specimens The asphalt and felts were prepared as in 2.4a . The hot plate ( A ) on the laboratory roofing machine ( fig . 1 ) was heated to about 250 ° F ( 121 ° C ) ...
Page 7
... performance and in both thick- nesses the Mid - Continent asphalt outperformed the Venezuela asphalt , which , in ... performances , however , a word of explanation is in order concerning the mechanism of cracking and why cracking ...
... performance and in both thick- nesses the Mid - Continent asphalt outperformed the Venezuela asphalt , which , in ... performances , however , a word of explanation is in order concerning the mechanism of cracking and why cracking ...
Page 8
... performances of specific systems , it can be seen that many of the specimens containing blue black slate have not deteriorated to the 25 per- cent spalled level after 17 years of exposure . For these systems , just as with the asphalts ...
... performances of specific systems , it can be seen that many of the specimens containing blue black slate have not deteriorated to the 25 per- cent spalled level after 17 years of exposure . For these systems , just as with the asphalts ...
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