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
... black slate , clay , dolomite , fly ash , mica , and silica ) were evaluated at concentrations up to 60 percent in ... 25 mils , were back - coated with the same coating blend , and were dusted with mica retained on a No. 100 sieve . $ 1 ...
... black slate , clay , dolomite , fly ash , mica , and silica ) were evaluated at concentrations up to 60 percent in ... 25 mils , were back - coated with the same coating blend , and were dusted with mica retained on a No. 100 sieve . $ 1 ...
Page 8
... 25 % Cracked 50 % Cracked Coating description Initial Spall 25 % Spalled 50 % Spalled Months Ratio Months Ratio ... black slate have not deteriorated to the 25 per- cent spalled level after 17 years of exposure . For these systems , just ...
... 25 % Cracked 50 % Cracked Coating description Initial Spall 25 % Spalled 50 % Spalled Months Ratio Months Ratio ... black slate have not deteriorated to the 25 per- cent spalled level after 17 years of exposure . For these systems , just ...
Page 9
... 25 % Cracked Coating description 50 % Cracked Initial Spall 25 % Spalled 50 % Spalled Months Ratio Months Ratio ... black slate are deteriorating more slowly than those with lower concentrations . For materials with other than those with ...
... 25 % Cracked Coating description 50 % Cracked Initial Spall 25 % Spalled 50 % Spalled Months Ratio Months Ratio ... black slate are deteriorating more slowly than those with lower concentrations . For materials with other than those with ...
Page 10
... black slate , fly ash , and mica . The silica was most beneficial in the Cali- fornia asphalt , for it increased its durability ( 25 percent coating spalled ) as much as 80 percent . In all instances it increased the durability by at ...
... black slate , fly ash , and mica . The silica was most beneficial in the Cali- fornia asphalt , for it increased its durability ( 25 percent coating spalled ) as much as 80 percent . In all instances it increased the durability by at ...
Page 11
... 25 60 % Fly Ash mils 25 60 % Blue Black Slate 2 15 35 % Fly Ash 2 15 50 % Fly Ash 15 60 % Blue Black Slate 15 35 % Fly Ash 15 50 % Fly Ash 15 60 % Blue Black Slate 25 35 % Fly Ash 25 50 % Fly Ash 25 60 % Blue Black Slate 25 35 % Fly Ash ...
... 25 60 % Fly Ash mils 25 60 % Blue Black Slate 2 15 35 % Fly Ash 2 15 50 % Fly Ash 15 60 % Blue Black Slate 15 35 % Fly Ash 15 50 % Fly Ash 15 60 % Blue Black Slate 25 35 % Fly Ash 25 50 % Fly Ash 25 60 % Blue Black Slate 25 35 % Fly Ash ...
Common terms and phrases
60 percent aluminum aluminum-base specimens appearance Applied areas asphalt coatings ASTM base Black Slate 25 blistering Blue Black Slate Building Building Science Series Bureau of Standards California asphalt Cement Center cents Characteristics Clay Column COMMERCE concentrations consists containing corresponding cracking criteria deterioration differences direction divisions doctor bar Dolomite durability early effects exposed exposure failed failure felt-base specimens FIGURE Fly Ash Government granule-surfaced specimens granules grid half heated industry Institute Kraft paper listed longer Loss on ignition losses machine materials measurement method Mica Mid-Continent asphalt mils mineral additives Months Ratio Months National Bureau observed Office Organic panel passed performances period physical prepared procedure produced Properties provides Ratio Months Ratio reference reported Research rolls roofing saturated felt sheets shingle Silica smooth smooth-surface smooth-surface specimens spalling surface TABLE technical Technology temperature tests three asphalts Venezuela asphalt Washington weather weatherometer tests