Russian term (edited): ��������

Little more than a guess, but clinker is a possible road surfacing. Gost standards sometimes have a title in English.

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Note added at 23 mins (2006-02-16 10:57:16 GMT)
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Well, I looked at Multitran and "clink" can be a translation of заклинка in geological contexts, and заклинка also means "block" of some kind. "clinker" can also mean a building block. Here are definitions of "clinker" from the full Oxford English Dictionary, together with a helpful quote.
1. A very hard kind of brick of a pale colour, made in Holland, and used for paving.
2. a. A brick whose surface has become vitrified by exposure to intense heat in the kiln or clamp. b. A mass of bricks fused by excessive heat, and adhering together.
3. A hard mass formed by the fusion of the earthy impurities of coal, lime-stone, iron ore, or the like, in a furnace or forge; a mass of slag.
1954 Highway Engin. Terms (B.S.I.) 32 Clinker asphalt, a wearing course consisting of rolled asphalt in which the principal aggregate is clinker.