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A pallet of "8-inch" concrete blocks An interior wall of painted concrete blocks Concrete masonry blocks A building constructed with concrete masonry blocks. A concrete block, also known as a cinder block in North American English, breeze block in British English, or concrete masonry unit (CMU), or by various other terms, is a standard-size rectangular block used in building construction.
Masonry walls have an endothermic effect of its hydrates, as in chemically bound water, unbound moisture from the concrete block, and the poured concrete if the hollow cores inside the blocks are filled. Masonry can withstand temperatures up to 1,000 °F (538 °C) and it can withstand direct exposure to fire for up to 4 hours.
A hydraulic splitter, also known as rock splitter or darda splitter, is a type of portable hydraulic tool. It is used in demolition jobs which involve breaking large blocks of concrete or rocks . Its use in geology was first popularized by volcanologist David Richardson.
The "Wizard" Concrete Block Machine was available for $32.95 and produced 8 × 8 × 16 inch blocks in a "Medium rock-face design". For $52.95, a prospective buyer could get the "Triumph" Concrete Block Machine which had the capacity of producing between 200 and 250 blocks per day.
Splitting a block of marble with plug and feathers A stonemason at Eglinton Tournament Bridge with a selection of tools of the trade. A quarryman splits or cuts rock in the quarry, and extracts the resulting blocks of stone. The cut or split pieces are collected and transported away from the extraction surface for further refinement. [1]
Lewises in a stonemasonry workshop Chain lewis Split-pin lewis Three-legged lewis. A lewis (sometimes called a lewisson) is one of a category of lifting devices used by stonemasons to lift large stones into place with a crane, chain block, or winch.