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
... Figures in brackets indicate the literature references at the end of this paper . 2. Experimental Details 2.1 . Types of Specimens Three types of specimens were included ... FIGURE 1. Apparatus for preparing granule - surfaced specimens . 1.
... Figures in brackets indicate the literature references at the end of this paper . 2. Experimental Details 2.1 . Types of Specimens Three types of specimens were included ... FIGURE 1. Apparatus for preparing granule - surfaced specimens . 1.
Page 2
... figure 1. Its principal parts are : A. Hot plate for keeping the base warm during the pouring of the coating . B. Variable - voltage - controlled , temperature - reg- ulated doctor bar for spreading the coating and regulating its ...
... figure 1. Its principal parts are : A. Hot plate for keeping the base warm during the pouring of the coating . B. Variable - voltage - controlled , temperature - reg- ulated doctor bar for spreading the coating and regulating its ...
Page 4
... FIGURE 2. Apparatus for coating the backs of the specimens . Each specimen was placed face up on the top of the 11 -incylinder and the crank turned to apply a thin coating on its back . TABLE 2. Characteristics of unstabilized asphalt ...
... FIGURE 2. Apparatus for coating the backs of the specimens . Each specimen was placed face up on the top of the 11 -incylinder and the crank turned to apply a thin coating on its back . TABLE 2. Characteristics of unstabilized asphalt ...
Page 8
... figures have been published . These are listed in table 8 . It is evident from the above data asphalt moves roughly 25 times as much as the saturated felt does in the cross direction and 50 times as much as the saturated felt in the ...
... figures have been published . These are listed in table 8 . It is evident from the above data asphalt moves roughly 25 times as much as the saturated felt does in the cross direction and 50 times as much as the saturated felt in the ...
Page 10
... Figure 3 is a photograph of some of the specimens made with Mid - Continent asphalt after 161⁄2 years of exposure . The test specimens are the five in each column under the identification tags , as identified in figure 3 . The variation ...
... Figure 3 is a photograph of some of the specimens made with Mid - Continent asphalt after 161⁄2 years of exposure . The test specimens are the five in each column under the identification tags , as identified in figure 3 . The variation ...
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