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)-資料下載頁
2025-01-19 08:31本頁面
【導(dǎo)讀】理想的骨料級配應(yīng)使泥漿的體。積最小，僅將每塊骨料包上薄薄的一層即可?；炷粱旧鲜且环N幾乎沒有抗拉強(qiáng)度的抗壓縮材料。導(dǎo)致混凝土抗剪強(qiáng)度低。在產(chǎn)生拉伸應(yīng)力和剪應(yīng)力的部位加入鋼筋克服這些缺陷。載作用下，鋼筋混凝土梁實(shí)際上會(huì)有許多沿垂直于主拉應(yīng)力方向的微裂縫。拉應(yīng)力完全被鋼筋所承擔(dān)。決定其強(qiáng)度的最重要因素是其配料中的含水率。操作和澆筑混凝土需要多加一些水，但是過量的水分是、會(huì)導(dǎo)致強(qiáng)度明顯降低。混凝土被認(rèn)為是作“可成型的”或“可模性的”結(jié)構(gòu)材料。與其他材料相比，混凝。發(fā)達(dá)國家可能不容易得到。為有效的隔聲材料。應(yīng)廠商遍布美國各城市，其混合物通常具有均勻的高質(zhì)量。凝土需要技術(shù)性監(jiān)督。無論是操作或養(yǎng)護(hù)條件不好或二者兼而有之都能嚴(yán)重削弱混凝土的。由于種種原因，大多數(shù)建筑規(guī)范都要求在施工的各個(gè)階段進(jìn)行獨(dú)立的現(xiàn)場檢查。更重要的是，過高的溫度以及低于。冰點(diǎn)的溫度都能使混凝土施工非常困難。
【正文】 manner.) 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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