Rubble(redirected from rubbled)
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large, irregularly shaped pieces with an edgewise length of 150-500 mm, obtained from limestones, dolomites, sandstones, and more rarely granites. Cobblestone is a variety of rubble (boulders with edgewise length up to 300 mm). In the production of rubble, rocks are used with a limit of compression strength up to 100 meganewtons (mN) per sq m (1,000 kilograms-force per sq cm). Rubble is classified according to strength: low-strength (2.5-10 mN per sq m), medium-strength (15-40 mN per sq m), and high-strength (over 50 mN per sq m). Requirements for frost resistance in rubble are determined according to conditions of use (from 15 to 300 cycles of freezing). Rubble is used for the laying of foundations, for walls of auxiliary buildings, for the channeling of canals, for hydrotechnical structures, and so on.