土木工程外文資料翻譯--混凝土與鋼筋混凝土的特性-建筑結(jié)構(gòu)-閱讀頁
2025-02-08 08:31本頁面
【正文】 Concrete is naturally fireproof and needs no separate protection system. Because of its mass, it can also serve as an effective barrier to sound transmission. In viewing the negative aspects, concrete is unfortunately quite heavy and it is often noted that a concrete structure expends a large portion of its capacity merely carrying itself. Attempts to make concrete less dense, while maintaining high quality levels, have generally resulted in increased costs. Nevertheless, use of lightweight concrete can sometimes result in overall economies. Concrete requires more quality control than most other building materials. Modern transitmixed concrete suppliers are available to all . urban areas and the mix is usually of a uniformly high quality. Fieldorjobmixed concrete requires knowledgeable supervision, however. In any type of concrete work, missing or mislocated reinforcing bars can result in elements with reduced load capacities. Poor handing and/or curing conditions can seriously weaken any concrete. For these and other reasons, most building codes require independent field inspections at various stages of construction. Proper concrete placement is also somewhat dependent upon the ambient weather condition .Extremely high temperatures and ,more important ,those below (or near) freezing can make concrete work very difficult.
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