Reasons for Color Change in Roofing Granules Colored by Ceramic Method

On the territory of CIS, about 80% of flat roofs and 20% of pitched roofs are covered with polymer-bitumen materials. An integral element of the upper protective layer of these roofs is coarse-grained covering or roofing granules. When producing spreading materials, each particle of the mineral base consisting of specially selected, crushed, and fractioned rock is covered with a ceramic layer. The particles of the rock of 0.5–2 mm are subjec1ted to the impact of extremely high temperature when producing and various weather effects during the whole operation period of the roof. If the rock is wrongly selected, then the protective layer doesn’t work and the roofing material is destructed. Specific complaints of consumers are the cases of changing the color of the roof due to separation of the granules of iron oxyhydroxides on the surface. These negative phenomena occur both at the stage of production and during the roof operation. Reasons for changing the color and methods for selecting the rock are considered.

A.S. ALMATOV, Engineer-Economist (This email address is being protected from spambots. You need JavaScript enabled to view it.),
V.N. SOKOV, Doctor of Sciences (Engineering), Professor (This email address is being protected from spambots. You need JavaScript enabled to view it.);
E.O. KALISTRATOVA, Master 

1 National Research Moscow State University of Civil Engineering (26, Yaroslavskoye Highway, 129337, Moscow, Russian Federation) 
2 OOO «UGGA» (20, Zavodskaya Street, Ufa, 450097, Russian Federation)

1. Kogel J.E., Triverdi N.C., Barker J.M., Krukowski S.T. Roofing materials. Industrial Minerals and Rocks. 2006. 7th ed, pp. 1174–1175. 

2. Berger E.H. Ceramic Roofing Granules. Ceramic Age. 1935. No. 2, pp. 49–51. 

3. Jewett C.L. Roofing Granules. Industrial minerals and Rocks. 1983. 5th ed, pp. 15–19. 

4. Patent US 20060251807 A1. Roofing Granules With Improved Surface Coating Coverage And Functionalities And Method For Producing Same. Keith Hong, Ming Shiao. Declared 21.04.2006. Published 09.11.2006. 

5. Patent US 5516573 A. Roofing materials having a thermoplastic adhesive intergace between coating asphalt and roofing granules. Billy L. George, Stefan A. Babirad, Vincent J. Laraia, Jr., Wilson S. Bigham. Declared 26.09.1994. Published 14.05.1996. 

6. Ozhogina E.G., Rogozhina A.A. Technological mineralogy: innovative approaches to assessment of mineral raw materials. Collection of essays of 5th Russian seminar about technological mineralogy “Mineral and technic appraisal of deposits and a problem of disclosure of minerals”. Petrozavodsk. 2011. pp. 7–12. (In Russian). 

7. Afanas’eva M.A., Bardina N.Y., Bogatikov O.A. Petrografiya i petrologiya magmaticheskikh, metamorficheskikh i metasomaticheskikh gornykh porod [Petrography and Petrology of igneous, metamorphic and metasomatic rocks] Moscow: Logos, 2001. 768 p. 

8. Emel’yanenko P.F., Yakovleva E.B. Petrografiya magmaticheskikh i metamorficheskikh porod [Petrography of magmatic and metamorphic rocks]. Moscow: MGU. 1985. 248 p. 

9. Topor N.F., Ogorodova L.P., Mel’chakova L.V. Termicheskiy analiz mineralov i neorganicheskikh soedineniy [Thermal analysis of minerals and inorganic compounds]. Moscow: Nauka MGU. 1987. 190 p.