资料简介：
CONCRETE AND MORTAR
1. Early History of Cement and Concrete
Shelter from the very beginning of man/ existence, has demanded the application Of the best , available technology of the contemporary era. In the earliest ages, structures consisted of rammed earth, or stone blocks laid one on another without benefit of any bonding or cementing medium. Stability of the stone structures depended on the regular setting of the heavy stones , The earliest masonry probably consisted of sun-dried clay bricks, set in regular courses in thin layers of moist mud. When the moist mud dried, a solid clay wall resulted. Construction: of this kind was common in the dry desert areas of the world.
建筑材料-混凝土与砂浆
一、水泥与混凝土的早期历史
自从人类开始存在时起，人的住处一直要求应用每个时代所能提供的最好的技术。在最初时期，建筑物是由土夯实而成，或者在没有任何连接或粘接物的情况下，用石头一块一块地垒砌而成。石材建筑的稳定性依赖于重石块有规则的排放。最早的砖石建筑可能是由阳光晒干后的土砖，有规则地一层一层砌在薄泥浆上而构成。泥浆变干后，就成为坚实的土墙。这种建筑结构在世界上一些干燥的沙漠地区曾经很常见。
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