Natural Weathering of Mineral Stabilized Asphalt Coatings on Organic Felt |
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Page 1
Six finely divided mineral additives ( blue black slate , clay , dolomite , Ay ash , mica , and silica ) were evaluated ... These were exposed with coating thicknesses of 15 and 25 mils , 3 were back - coated with the same coating blend ...
Six finely divided mineral additives ( blue black slate , clay , dolomite , Ay ash , mica , and silica ) were evaluated ... These were exposed with coating thicknesses of 15 and 25 mils , 3 were back - coated with the same coating blend ...
Page 8
25 % Cracked 50 % Cracked Initial Spall 25 % Spalled 50 % Spalled Coating description Months Ratio Months Ratio Months ... containing blue black slate have not deteriorated to the 25 percent spalled level after 17 years of exposure .
25 % Cracked 50 % Cracked Initial Spall 25 % Spalled 50 % Spalled Coating description Months Ratio Months Ratio Months ... containing blue black slate have not deteriorated to the 25 percent spalled level after 17 years of exposure .
Page 9
Smooth surface specimens 1 25 Mil ( 0.64 mm ) Thickness Outdoor Exposures 1 Average of two specimens . ... It is also apparent , with one exception , that coatings with higher concentrations of blue black slate are deteriorating more ...
Smooth surface specimens 1 25 Mil ( 0.64 mm ) Thickness Outdoor Exposures 1 Average of two specimens . ... It is also apparent , with one exception , that coatings with higher concentrations of blue black slate are deteriorating more ...
Page 10
... specimens were more variable than those of blue black slate , fly ash , and mica . The silica was most beneficial in the California asphalt , for it increased its durability ( 25 percent coating spalled ) as much as 80 percent .
... specimens were more variable than those of blue black slate , fly ash , and mica . The silica was most beneficial in the California asphalt , for it increased its durability ( 25 percent coating spalled ) as much as 80 percent .
Page 11
... Coating composition Thickness mils mils 35 % Mica 25 60 % 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 ...
... Coating composition Thickness mils mils 35 % Mica 25 60 % 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 ...
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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