Early concrete masons combined quick lime and moist sand, placed the mixture in a mold under pressure, and cured it with steam to make a usable block.

Name: Early concrete masons combined quick lime and moist sand, placed the mixture in a mold under pressure, and cured it with steam to make a usable block.
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This statement is true. This method of making concrete blocks was commonly used in the 19th and early 20th century before newer techniques were developed.

Early Concrete Masons Combined Quick Lime and Moist Sand, Placed