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62:(rock fragments and small stones mixed with concrete), making the external surface as plain as possible. Later the external surface became plainer still by reducing the amount of concrete and choosing more regular small stones. When the amount of concrete between stones is particularly reduced, it is defined as
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construction technique, using irregularly shaped and randomly placed uncut stones or fist-sized
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as more expensive and structurally inferior, since cracks propagate more easily.
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Ancient Roman masonry using irregular stones in a core of concrete
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Initially it consisted of more careful placement of the
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