- Author
-
Greenfeld, S. H.
- Title
- Natural Weathering of Mineral Stabilized Asphalt Coatings on Organic Felt. Building Science Series.
- Coporate
- National Bureau of Standards, Washington, D.C. Building Research Div.
- Report
-
NBS BSS 024
October 1969
- Keywords
-
construction materials, roofs; bituminous coatings, environmental tests; asphalt, environmental tests; additives; minerals; life expectancy; weatherproofing; exposure; aging (materials); deterioration; performance (engineering); accelerated testing; correlation techniques; clay minerals; mica; silicon dioxide; granules
|
fly ash
|
life (durability)
- Identifiers
- roofing; weathering; stabilizers (agents); slates; dolomite (mineral); evaluation
- Abstract
- 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)